CN103533270B - An audio playback device and audio control method - Google Patents

Abstract

The invention discloses an audio playing device and an audio control method, wherein the audio playing device comprises: the main control module is used for acquiring the audio signal and the audio characteristic parameter selected by the user, and indicating the power amplifier module to only control one group of loudspeakers or a plurality of groups of loudspeakers according to the relation between the accompanying sound power of the audio signal under the audio characteristic parameter and the set power threshold value; the power amplifier module is used for receiving the audio signals and the instructions sent by the main control module, controlling to start one or more groups of loudspeakers according to the instructions of the main control module, amplifying the received audio signals and outputting the amplified audio signals to the started loudspeakers; and the plurality of groups of loudspeakers are positioned in the same box body and are used for receiving and playing the audio signals output by the power amplifier module. The invention can obtain good bass effect under low power and can meet the requirement of users on high power.

Description

An audio playback device and audio control method

technical field

The invention relates to the field of audio technology, in particular to an audio playback device and an audio control method.

Background technique

The thinning of flat-panel TVs has become a trend in the TV industry. Thinner and thinner flat-panel TVs occupy the space of speakers, making the volume of speaker boxes smaller, making it difficult for flat-panel TVs to have good sound quality, especially difficult to achieve sound effects from speaker boxes. Volume constraints for maximum bass effect.

At present, in the TV industry, it is mainly to ensure that the speaker has sufficient volume by configuring thin speakers in the whole machine and increasing the length and width of the speakers as much as possible. However, this design idea will lead to the following problems as the thickness of the whole machine is further thinned:

1) The thinning of the speaker brings difficulties to the arrangement of the structural components of the whole machine. As we all know, the bass effect of ordinary speakers is directly proportional to the volume of the speakers. With the further thinning of the speaker volume, in order to maintain the original bass effect, it is necessary to increase the length or width of the speaker. However, in the thinner machine, the layout of the components is compact, and it is difficult to make enough space for the speakers in the length and width directions. And if you can't make enough space for the speaker in terms of length and width, often only the midrange and treble parts can be reproduced, and the bass part can't be reproduced well or even can't be reproduced, so what the user hears The sound will be relatively dry, which will affect the user experience.

2) Speaker design with too large area and too thin thickness will increase the difficulty of production and increase the cost. Large and thin speakers will have low structural strength, great tremor hazards, and high mold opening costs.

3) The thin speaker design aggravates the contradiction between the speaker's withstand power, the volume of the speaker and the volume of the speaker. This thin speaker design compresses the volume of the speaker unit, resulting in: a) the reduction of electro-acoustic conversion efficiency and sound effect, which requires a larger electric power to make up for it; b) the speaker unit’s withstand power becomes smaller, It is difficult to meet the requirements of the whole machine. In order to solve these two problems, it is often necessary to be forced to increase the number of loudspeakers to meet the total power requirements, but the increase in the number of loudspeakers requires a larger volume of the speaker box to adapt to it. In other words, the length and width of the speakers need to be further increased, which will undoubtedly further aggravate the two contradictions of 1) and 2).

With the introduction of thinner TVs such as OLED, the above problems will become more common and more difficult to solve.

At present, some foreign manufacturers "hide" the subwoofer in the base of the flat-panel TV to solve the above problems, but this will lead to the following limitations:

1) When hanging on the wall, the base needs to be reinstalled, and the operation is complicated or even impossible to reinstall;

2) The base speakers are concentrated directly below the center of the TV, which greatly reduces the stereo effect of the TV;

3) The base that is too heavy is not in harmony with the thin body, and it will increase the cost of the whole machine.

In the patent No. 200720020673.9, the patent name is "Dual Woofer Subwoofer" and it is proposed to use two woofers to achieve better bass effect by connecting in series or in parallel. However, simply increasing the number of woofers cannot achieve better bass effect, and it is necessary to increase the volume of the speaker box. As mentioned above, this design idea is no longer suitable for the trend of further thinning flat-panel TVs.

The volume of the existing thin flat-panel TV speakers is limited, which requires thin speakers, and if the thin speakers want to meet the power requirements of the whole machine and the user's requirements for high power, it is necessary to increase the number of speakers, and the increase in the number of speakers requires Larger speaker volume. There is no specific solution in the prior art to solve the contradiction between the volume and power of the sound box.

Contents of the invention

The invention provides an audio playback device and an audio control method, which are used to solve the contradiction between the volume and power of the sound box when the volume of the thin TV sound box is limited, so that the thin TV can obtain a good sound quality when the power is low. The bass effect can meet the power requirements of the whole machine and the user's requirements for high power.

The invention provides an audio playback device, comprising:

The main control module obtains the audio signal and the audio characteristic parameter selected by the user. When the sound power of the audio signal under the audio characteristic parameter is less than or equal to the set power threshold, the acquired audio signal is output to the power amplifier module, and the power amplifier is instructed to The module only controls to turn on one group of speakers, and when the sound power of the audio signal under the audio characteristic parameter is greater than the set power threshold, output the acquired audio signal to the power amplifier module, and instruct the power amplifier module to control to turn on multiple groups of speakers;

The power amplifier module receives audio signals and instructions sent by the main control module, controls and turns on one of the speakers or groups of speakers according to the instructions of the main control module, and amplifies the received audio signals and outputs them to each group of speakers that are turned on;

At least one group of loudspeakers located in the same box receive and play the audio signal output by the power amplifier module.

The circuit connections between the groups of speakers located in the same box are independent, and the same group of speakers includes one speaker or multiple speakers with circuit connections.

The withstand power of each group of speakers in the same box may be equal or unequal.

Preferably, the withstand power of each group of loudspeakers is equal.

Setting the withstand power of each group of loudspeakers to be equal can facilitate their power control.

In this way, when the sound power is low, only one group of speakers can be turned on to achieve a better bass effect, and when the sound power is high, multiple groups of speakers can be turned on at the same time to meet the user's requirement for high power.

Here, by setting the power threshold, and according to the comparison of the sound power of the audio signal under the audio feature parameter with the set power threshold, it is determined how many groups of speakers to turn on.

Preferably, the audio feature parameter selected by the user is volume, and when the main control module determines that the volume selected by the user is less than or equal to the set volume threshold, it instructs the power amplifier module to only turn on one of the speakers, and will input to the speaker of the group. The amplification factor of the audio signal is set to a fixed non-zero value; the main control module adjusts the audio signal amplitude output to the power amplifier module according to the proportional relationship between the volume and the amplitude when the volume selected by the user is less than or equal to the set volume threshold.

At this time, one group of speakers can be made to work, and the other groups of speakers can be muted, and one group of speakers can make full use of the cabinet space to reproduce the bass and achieve a better bass effect.

Preferably, the audio feature parameter selected by the user is the volume, and when the main control module determines that the volume selected by the user is greater than the set volume threshold, the output amplitude is an audio signal with the set amplitude threshold, and instructs the power amplifier module to turn on the M groups of speakers, and the The amplification factor of the audio signal input to the turned-on M-1 group of speakers is set to a fixed non-zero value, and according to the proportional relationship between the volume and the amplification factor, the power amplifier module is instructed to set the amplification factor of the audio signal input to the other group of speakers that is turned on. It is the amplification factor corresponding to the current volume, and M is greater than 1;

At this time, the M groups of speakers are turned on at the same time, which can meet the power requirements of the whole machine and the user's requirements for high power.

The present invention also provides an audio control method, comprising:

Acquire audio signals and audio feature parameters selected by the user;

When it is determined that the sound power of the audio signal under the audio characteristic parameter is less than or equal to the set power threshold, the acquired audio signal is output to the power amplifier module, and the power amplifier module is instructed to only control and turn on one of the speakers in the same cabinet;

When it is determined that the sound power of the audio signal under the audio characteristic parameter is greater than the set power threshold, the acquired audio signal is output to the power amplifier module, and the power amplifier module is instructed to control and turn on multiple groups of speakers in the same cabinet.

Preferably, the audio feature parameter selected by the user is the volume, indicating that the power amplifier module only controls to turn on one of the speakers in the same box, specifically including:

When it is determined that the volume selected by the user is less than or equal to the set volume threshold, instruct the power amplifier module to only turn on one of the speakers, and set the amplification factor of the audio signal input to the speaker to a fixed non-zero value;

Output the acquired audio signal to the power amplifier module, including:

When it is determined that the volume selected by the user is less than or equal to the set volume threshold, the amplitude of the audio signal output to the power amplifier module is adjusted according to the proportional relationship between the volume and the amplitude.

Preferably, the audio feature parameter selected by the user is the volume, which instructs the power amplifier module to control and turn on multiple groups of speakers in the same box, specifically including:

When it is determined that the volume selected by the user is greater than the set volume threshold, instruct the power amplifier module to turn on the M group of speakers, set the amplification factor of the audio signal input to the turned-on M-1 group of speakers to a fixed non-zero value, and according to the volume and the amplification factor Proportional relationship, instructing the power amplifier module to set the amplification factor of the audio signal input to another group of speakers that is turned on as the amplification factor corresponding to the current volume, and M is greater than 1;

Output the acquired audio signal to the power amplifier module, including:

When it is determined that the volume selected by the user is greater than the set volume threshold, an audio signal with an amplitude equal to the set amplitude threshold is output to the power amplifier module.

Utilizing the audio control method and audio playback device provided by the present invention has the following beneficial effects: it solves the contradiction between the volume and power of the sound box when the volume of the thin TV sound box is limited, so that the thin TV can operate at low power, Get a good bass effect, and can meet the power requirements of the whole machine and the user's requirements for high power.

Description of drawings

Fig. 1 is a structural diagram of an audio playback device according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the connection of a traditional sound box speaker;

Fig. 3 is a schematic diagram of speaker connection in the speaker box provided by the embodiment of the present invention;

FIG. 4 is a schematic diagram of signal processing provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of configuration of audio speakers for left and right channels provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a volume control method for each group of speakers of the left channel provided by an embodiment of the present invention;

Fig. 7 is a flowchart of an audio control method according to an embodiment of the present invention.

detailed description

The audio control method and audio playback device proposed by the present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, an audio playback device provided by an embodiment of the present invention includes:

The main control module 101 acquires the audio signal and the audio characteristic parameter selected by the user. When the sound power of the audio signal under the audio characteristic parameter is less than or equal to the set power threshold, the acquired audio signal is output to the power amplifier module, and the power is indicated. The amplifier module only controls to turn on one group of speakers, and when the sound power of the audio signal under the audio characteristic parameter is greater than the set power threshold, output the acquired audio signal to the power amplifier module, and instruct the power amplifier module to control to turn on multiple groups of speakers;

The power amplifier module 102 receives the audio signal and instructions sent by the main control module, controls and turns on one of the speakers or groups of speakers according to the instructions of the main control module, and outputs the received audio signals to the opened groups of speakers after amplifying the received audio signals;

Multiple groups of loudspeakers 103 located in the same cabinet receive and play audio signals output by the power amplifier module.

Wherein, the power amplifier module may only include one power amplifier, or may include multiple power amplifiers. Specifically, one power amplifier can control a group of speakers, and if the power amplifier is powerful enough, one power amplifier can also control multiple groups of speakers.

Specifically, when the sound power of the audio signal is small, in order to achieve a better bass effect, only one of the speakers can be controlled to be turned on; User requirements for high power.

Specifically, the circuit connections between the groups of speakers located in the same box are independent, that is, there is no circuit connection between the groups of speakers, and the same group of speakers includes one speaker or multiple speakers with circuit connections.

The withstand power of each group of speakers in the same box can be equal or different. Preferably, the withstand power of each group of speakers is equal to facilitate power control.

Wherein, the set power threshold is not greater than the withstand power of one group of speakers.

As a preferred implementation manner, the power threshold is set to be smaller than but close to the withstand power of one group of speakers, so that a certain elastic space can be reserved to prevent the speakers from being damaged due to excessive power.

As another preferred implementation manner, the set power threshold may also be equal to the withstand power of one group of speakers. The maximum sound power of the audio signal under the user-selectable audio characteristic parameter is equal to the sum of the withstand power of multiple groups of speakers.

Preferably, the audio characteristic parameter selected by the user can be but not limited to volume, and when the main control module determines that the volume selected by the user is less than or equal to the set volume threshold, it instructs the power amplifier module to control only one of the speakers to be turned on, and the input The amplification factor of the audio signal to the group of loudspeakers is set to a fixed non-zero value; when the volume selected by the user is less than or equal to the set volume threshold, the main control module adjusts the output to the power amplifier module according to the proportional relationship between the volume and the amplitude. audio signal amplitude.

Of course, other control methods may also be used, as long as the sound power of the audio signal entering the set of speakers that is turned on is equal to the sound power corresponding to the volume selected by the user.

Here, the audio feature parameter selected by the user is not limited to the volume, and the user may also select other audio feature parameters that can be used to determine the power of the sound.

Specifically, when one group of speakers is controlled to be turned on, the sound power of the audio signal entering the group of speakers is not greater than its own tolerance power; when multiple groups of speakers are controlled to be turned on, the audio signal entering any group of speakers The sound power is not greater than its own withstand power, and the sum of the sound power of the audio signals entering each group of speakers is equal to the sound power of the audio signal under the audio characteristic parameter.

In this way, the maximum sound power of the audio signal under the user-selectable audio characteristic parameters will not exceed the sum of the withstand power of each group of loudspeakers.

When the sound power of the audio signal is not greater than the set power threshold, one set of speakers can be made to work, and the other set of speakers can be muted, and one set of speakers can make full use of the cabinet space to reproduce the bass and achieve a better bass effect . When the sound power of the audio signal is greater than the set power threshold, multiple sets of speakers are turned on at the same time, which can meet the power requirements of the whole machine and the user's requirements for high power.

The main control module can determine the sound power of the played audio signal according to the selected audio characteristic parameters, that is to say, there is a corresponding relationship between the audio characteristic parameters and the sound power.

Specifically, the proportional relationship between the volume and the amplitude is established in the following manner: according to the audio signal amplitude corresponding to zero when the volume is zero, and the corresponding set amplitude threshold when the volume is the set volume threshold, the proportional relationship between the volume and the amplitude is established. The set magnitude threshold is determined in the following manner:

When the amplitude of the audio signal output to the power amplifier module is adjusted to the set amplitude threshold, the sound power of the audio signal entering one of the turned-on speakers is the sound power of the corresponding audio signal when the volume is equal to the set volume threshold.

When only one of the speakers is turned on, the volume requirement is met by adjusting the amplitude of the audio signal. The greater the volume, the greater the amplitude. When the volume is equal to the set volume threshold, the amplitude reaches the set amplitude threshold. When the volume exceeds the set volume threshold, the amplitude will not increase, but the set amplitude threshold remains unchanged.

Preferably, the audio feature parameter selected by the user is the volume, and when the main control module determines that the volume selected by the user is greater than the set volume threshold, the output amplitude is an audio signal with the set amplitude threshold, and instructs the power amplifier module to turn on the M groups of speakers, and the The amplification factor of the audio signal input to the turned-on M-1 group of speakers is set to a fixed non-zero value, and according to the proportional relationship between the volume and the amplification factor, the power amplifier module is instructed to set the amplification factor of the audio signal input to the other group of speakers that is turned on. It is the amplification factor corresponding to the current volume, and M is greater than 1

When the power amplifier module determines to turn off one group of speakers according to the instruction of the main control module, it turns off the group of speakers by setting the amplification factor of the audio signal input to the group of speakers to 0.

Specifically, when M groups of speakers are turned on at the same time, the sum of the sound power of the audio signals entering each group of speakers must be equal to the sound power corresponding to the current volume, wherein the sound power of the corresponding audio signal when the volume is equal to the set volume threshold is equal to Set the power threshold.

At this time, M groups of speakers work at the same time, which can meet the power requirements of the whole machine or the user's requirements for high power.

Set the amplification factor of the audio signal input to the turned-on M-1 group of speakers to a fixed non-zero value to ensure that the sound power of the audio signal entering each group of speakers in the M-1 group will not exceed but can be equal to that of the group of speakers Tolerant power, and the sum of the sound power of the audio signals entering the M-1 group of speakers is less than the sound power corresponding to the audio characteristic parameters selected by the user. It is necessary to adjust the amplification factor of the audio signal input to another group of speakers that is turned on. It is ensured that the sum of the sound power of the audio signals input to the M groups of speakers is equal to the sound power corresponding to the audio feature parameter selected by the user.

The above-mentioned set amplitude threshold is determined by the following method: when the audio signal amplitude output to the power amplifier module is adjusted to the set amplitude threshold, the sound power of the audio signal entering one of the speakers is corresponding to when the volume is equal to the set volume threshold The audio power of the audio signal.

Specifically, before the volume reaches the set volume threshold, the sound power of the audio signal entering one of the groups of speakers increases as the volume increases, and when the volume reaches the set volume threshold, the sound power of the audio signal entering the group of speakers remains The sound power remains unchanged. When the volume continues to increase, according to the sound power corresponding to the volume and the sound power difference entering each group of speakers that are turned on, when the difference is greater than zero, it is determined to turn on at least one group of speakers to ensure The turned-on speakers can meet the playback requirements. If it is determined to turn on another group of speakers, instruct the power amplifier module to set the amplification factor of the audio signal input to the turned-on group of speakers as the amplification factor corresponding to the current volume. If it is determined to turn on more groups, indicate The power amplifier module sets the amplification factor of the audio signal input to the other group of speakers that is turned on as the amplification factor corresponding to the current volume, and instructs the power amplifier module to set the amplification factor of the audio signal input to the other group of speakers that is turned on to a fixed non-zero value.

It should be noted that the audio signal amplification factor and fixed non-zero value corresponding to each group of speakers may be the same or different, and are related to the withstand power of each group of speakers.

Specifically, the proportional relationship between volume and magnification is established in the following way:

Determining the sum of the sound power of the audio signals entering the turned-on M-1 group of speakers, determining the volume corresponding to the sum of the sound power, and using the volume as a reference value;

According to the corresponding amplification factor when the volume is the reference value is zero, and the corresponding amplification factor when the volume is the maximum value, a proportional relationship between the volume and the amplification factor is established.

Among them, the corresponding magnification factor when the volume is at the maximum value is determined by the following method:

When the amplification factor of the audio signal input to the other group of speakers is adjusted to the corresponding amplification factor when the volume is at the maximum value, the sum of the sound powers input to the audio signals of the M groups of speakers is the corresponding sound power when the volume is at the maximum value.

When the volume is greater than the set volume threshold, only turning on one of the speakers can no longer meet the power requirements. At this time, multiple groups of speakers need to be turned on at the same time. At this time, the amplification factor of the audio signal input to the M-1 group of speakers is adjusted. To further increase the volume and meet the power requirements.

In this way, when multiple groups of speakers are turned on at the same time, the user's requirements for high volume and high power can be met.

Preferably, the set power threshold is equal to the withstand power of one group of speakers, and the sound power of the corresponding audio signal when the volume is equal to the set volume threshold is equal to the withstand power of one of the set of speakers.

Specifically, the acquired audio signal is an audio signal of a left channel or an audio signal of a right channel.

Specifically, you can choose to control only the audio signal of the left channel, or you can choose to control only the audio signal of the right channel, or you can choose to control the audio signals of the left and right channels at the same time.

During specific implementation, in terms of circuits, as shown in Figure 2, it is assumed that there are two sets of speakers in each speaker, and the signal source (TV, AV, component, HDMI, U disk, wireless, etc.) After the audio signal is processed, the left and right audio signals (audio signal 1 and audio signal 2) will be output. The power amplifier module performs power amplification processing on the received audio signal 1, and outputs two independent audio signals A1 and B1, which are respectively input into speaker 1, where A1 is input to one group of speakers, and B1 is input to the other group of speakers; the power The amplifier module performs power amplification processing on the received audio signal 2, and outputs two independent audio signals A2 and B2, which are respectively sent to the input speaker 2, wherein A2 is input to one set of speakers, and B2 is input to the other set of speakers. , the power amplifier module can independently turn on or turn off each group of speakers, specifically, the power amplifier module will control to turn on at least one group of speakers according to the instructions of the main control module.

Specifically, when the main control module determines that the accompanying sound power of the audio signal under the audio characteristic parameter is not greater than the set power threshold according to the audio characteristic parameter selected by the user, it instructs the power amplifier module to only control the opening of one of the speakers; determine the audio characteristic parameter When the sound power of the lower audio signal is greater than the set power threshold, the power amplifier module is instructed to control and turn on two groups of speakers, and the sum of the withstand power of the two groups of speakers is not less than the maximum sound of the audio signal under the user-selectable audio characteristic parameters power.

As shown in Figure 3, there can also be two sets of speakers in a traditional speaker box, but there must be a circuit connection (such as series or parallel connection) between the two sets of speakers in the same box, and the power amplifier module cannot turn on or off each set of speakers individually , The speaker only has two terminals, A+ and A-. The sound box provided by the embodiment of the present invention, as shown in Figure 4, has two groups of speakers in the same box and there is no circuit connection between the two groups of speakers (when there are multiple speakers in each group of speakers, there may be a circuit between the speakers in the group) Connection), four terminals A+, A-, B+, B- are drawn outside the speaker, and the power amplifier module can turn on or off the two groups of speakers A+, A- and B+, B- independently.

In this embodiment, the audio characteristic parameter selected by the user is volume, and when the main control module determines that the accompanying sound power of the audio signal is not greater than the set power threshold according to the volume, it will input a group of speakers (such as A1+, A1-, When the sound power of A2+, A2-) is not greater than the set power threshold, the power amplifier module can turn off another group of speakers (B1+, B1-, B2+, B2-) in each speaker, so that only one of the speakers in each speaker One set of speakers works, and the other set of speakers is muted, so that one set of speakers can make full use of the space of the entire speaker. Since the bass effect is directly proportional to the available volume of the speaker, in this case, better sound effects can be achieved, making the sound reproduced by the speaker less dry; when the main control module determines the volume of the audio signal according to the volume When the sound power is greater than the set power threshold, only one group of speakers is turned on and it is difficult to meet the power requirement (more than half of the sound power), at this time, the power amplifier module can turn on another group of speakers in each speaker (B1+, B1-, B2+, B2-), to simultaneously turn on two sets of speakers to meet the power load requirements, and the set power threshold is not greater than the withstand power of one set of speakers.

The power amplifier module can also realize functions such as adjusting signal amplification factor, digital equalizer adjustment (PEQ), dynamic output range control (DRC) (such functions can be realized by digital power amplifiers commonly used in the market, such as TAS5707, NF8212 Wait). Specifically, the control signal sent by the main chip instructs the power amplifier module to realize which functions.

There is a certain correspondence between the volume and the sound power of the audio signal. This correspondence can be obtained through testing or other methods. Using the test method, the sound power of the audio signal at each volume can be tested for multiple sampling volumes, as follows Show:

Volume 100 Volume 85 Volume 75 Volume 50 Volume 25

Full power P 0.5P 0.2P 0.05P 0.017P

It should be noted that the human ear's perception of the sound intensity is proportional to the logarithm of the sound intensity. When the electric power is halved, the sound pressure is only reduced by 3dB. Assume that when the sound power of a TV is 10W, the volume is set to 100. According to the usual practice in the industry, the volume value when the sound power is 5W is not 50, but about 85. The sound power of this TV is about 0.5W when the volume is 50. When most users watch TV, the volume usually chooses around 30-40 (or even lower), and few users choose the volume at 100. Therefore, in most occasions, the TV is often not used at the maximum volume, that is, the maximum sound power. Moreover, according to the equal loudness curve of the human ear, the human ear is not sensitive to low frequencies at low volumes, and more bass effects are needed to offset this "insensitivity". This embodiment can just meet this requirement.

In a small number of occasions (such as in larger auditoriums and classrooms) or special groups of people (the elderly with hearing loss, people with hearing impairment), TV also needs to be as loud as possible, which requires greater sound power. In such occasions or groups of people, "hearing and hearing clearly" is the main purpose, and "appreciating good sound effects" is not so important. Moreover, according to the equal loudness curve of the human ear, the human ear's ability to feel the bass is enhanced at high volume. Therefore, this embodiment can also meet the use requirements of such occasions or groups of people.

The volume that the present invention makes full use of casing is illustrated below:

Assuming that the volume of a thin TV speaker is 30, and only one speaker is installed in the same box, the volume of the speaker occupied by the speaker is 4, so the remaining volume of the speaker is 26, and the 26 volume of air will exert a pressure on the speaker, combined with the speaker bracket Two pressures are applied to the paper cone of the speaker at the same time. Due to the thinning of the sound box in the thin TV, the volume of the speaker unit in the sound box has been compressed. At this time, if there is still only one speaker in the same box, the power requirement cannot be met. Therefore, it is necessary to increase the number of speakers to meet the power requirements.

Using the prior art, when two speakers are installed in the same box, there must be a circuit connection between the two speakers. When the speakers work, the two speakers will work at the same time. Assuming that the volume of the speakers occupied by each speaker is also 4, Then the volume of the speaker box occupied by the two speakers is 8, and the volume occupied by the air is 22, which is equivalent to the available volume of each speaker is only 11. When the two speakers work at the same time, the volume of the speaker box occupied by the air is smaller. The greater the force applied to the speaker cone, the greater the pressure that the spring pressure and air pressure exert on the speaker cone at the same time, making it difficult for the speaker to produce bass, and the sound will be dry.

However, in the embodiment of the present invention, two sets of speakers are arranged in the same cabinet, and there is no circuit connection between the two sets of speakers. When the sound box is working, only one set of speakers can be turned on, or both sets of speakers can be turned on simultaneously. In this way, at low power, only one group of speakers is turned on, the volume occupied by the air is 22, and the available volume of this group of speakers is 22, that is to say, the volume of the speaker is relatively increased, and the force applied to the speaker cone If it is relatively reduced, the pressure of the spring pressure and air pressure applied to the speaker cone at the same time is small, so that the speaker can emit bass effect, and the sound will not be dry. In the case of high power, two sets of speakers can work at the same time to meet the high power requirements.

The following example illustrates the specific implementation process of the audio playback device provided by the present invention when the audio feature parameter selected by the user is the volume:

Assuming a 55-inch TV model, the sound power design requirement is 2*10W, the model is equipped with a speaker for the left and right channels, each speaker contains two sets of speakers, and each set of speakers includes a woofer and a tweeter Speaker, the withstand power of each speaker is 5W, as shown in Figure 5.

The following takes the left channel as an example to describe in detail. In this embodiment, the set power threshold is equal to the withstand power of the first group of speakers. As shown in Figure 6, when the main control module judges that the volume is low and has not reached the set volume threshold 85, it determines that the sound power corresponding to the audio signal at the current volume is not greater than the set power threshold, and instructs the power amplifier module to only control the opening of the first A group of speakers, specifically: set the amplification factor of the audio signal input to the A1+ and A1- terminals of the first group of speakers to a fixed non-zero value N, and set the amplification factor of the audio signal input to the B1+ and B1- terminals of the second group of speakers to 0 (mute), as the volume increases, the amplitude of the audio signal output by the main control module gradually increases, and the audio power of the audio signal input to the A1+ and A1- terminals of the first group of speakers also gradually increases. At this time, it is The increase of the volume is realized by adjusting the amplitude of the audio signal entering the first group of speakers; when the volume increases to the set volume threshold 85, the sound power of the audio signal input to the A1+ and A1- terminals of the first group of speakers reaches 5W , which is equal to the withstand power of the first group of speakers. At this time, the amplitude of the audio signal 1 no longer increases with the increase of the volume, but remains constant. In this way, no matter how the subsequent volume value increases, the A1+ and A1- terminals of the first group of speakers The sound power will remain unchanged at 5W; when the volume is greater than the set volume threshold of 85, the main control module instructs the power amplifier module to turn on the first group of speakers and the second group of speakers, and will input the audio signals input to the A1+ and A1- terminals of the first group of speakers The magnification factor of the speaker is set to a fixed non-zero value N, so that the magnification factor of the B1+ and B1- terminals of the second group of speakers gradually increases with the further increase of the volume. At this time, the sound power and audio frequency of the audio signal input to the first group of speakers The state of the signal amplitude remains unchanged when the volume is equal to the set volume threshold 85, and the sound power of the audio signal input to the second group of speakers gradually increases as the volume further increases. At this time, it is adjusted to enter the second group of speakers. The amplification factor of the audio signal is used to achieve a further increase in volume. When the volume reaches the maximum value of 100, the sound power of the audio signal input to the B1+ and B1- terminals of the second group of speakers also reaches 5W, which is equal to the withstand power of the second group of speakers, while the sound input to the B1+ and B1- terminals of the first group of speakers The power also reaches 5W. At this time, the total power of the left channel speaker is 5W+5W, which meets the design requirements. The audio playback device provided by the embodiment of the present invention is also applicable to the right channel, so details are not repeated here.

In this way, through a simple control algorithm, the function of "a single set of speakers works at low volume, and multiple sets of speakers work at high volume" can be realized.

Of course, this is just an example, and the values such as volume 85 and 5W are also examples, and what algorithm to use to control the audio playback device needs to be determined according to the actual situation. Similarly, the parameter for judging whether to turn on or off each group of speakers does not necessarily have to be the volume. With the development of smart TV technology, through the analysis of signal sources, the detection of power output terminals, and even the user's voice control, can be used as the realization of speaker volume. Control conditions for turning on and off.

Furthermore, the first group of speakers and the second group of speakers can also flexibly use functions such as PEQ and DRC of the power amplifier module to further optimize the sound signal to achieve better sound effects.

In this embodiment of the solution, the power amplifier module can independently turn on or turn off different speakers located in the same sound box. That is to say, for the 2.0 speaker solution, the power amplifier module is required to turn on and off the four groups of speakers individually. The above functions can be realized by increasing the number of power amplifiers (for example, from one power amplifier in a single machine to two power amplifiers in a single machine). Of course, increasing the number of power amplifiers is just an example, and the implementation method is not limited to this. For example, the performance of a single power amplifier can be enhanced so that it can independently control 4 groups of speakers.

The present invention is also applicable to some flat-panel TVs in the current industry that use the "combination of sound from the bottom + sound from the rear" (that is, on a sound box, it includes both the speaker that emits the sound downward and the speaker that emits the sound backward). . Also, the number of speakers in each group can be different, for example, one group of speakers includes a woofer and a tweeter, and the other group of speakers only has a woofer.

The invention is also applicable to the sound box design of some flat-panel TVs that adopt phase-inverting holes or passive radiators in order to enhance the low-frequency effect.

The present invention is suitable for medium and high-grade, medium and large-sized flat-panel TVs in the future.

As shown in Figure 7, the present invention also provides an audio control method, including:

Step 701, acquiring the audio signal and the audio characteristic parameters selected by the user;

Step 702, when it is determined that the sound power of the audio signal under the audio characteristic parameter is less than or equal to the set power threshold, output the acquired audio signal to the power amplifier module, and instruct the power amplifier module to only control and turn on one of the speakers in the same cabinet ;

Step 703, when it is determined that the sound power of the audio signal under the audio characteristic parameter is greater than the set power threshold, output the acquired audio signal to the power amplifier module, and instruct the power amplifier module to control and turn on multiple groups of speakers in the same cabinet.

Preferably, the audio feature parameter selected by the user is the volume, indicating that the power amplifier module only controls to turn on one of the speakers in the same box, specifically including:

When it is determined that the volume selected by the user is less than or equal to the set volume threshold, instruct the power amplifier module to only turn on one of the speakers, and set the amplification factor of the audio signal input to the speaker to a fixed non-zero value;

Output the acquired audio signal to the power amplifier module, including:

When it is determined that the volume selected by the user is less than or equal to the set volume threshold, the amplitude of the audio signal output to the power amplifier module is adjusted according to the proportional relationship between the volume and the amplitude.

Preferably, the audio feature parameter selected by the user is the volume, which instructs the power amplifier module to control and turn on multiple groups of speakers in the same box, specifically including:

When it is determined that the volume selected by the user is greater than the set volume threshold, instruct the power amplifier module to turn on the M group of speakers, set the amplification factor of the audio signal input to the turned-on M-1 group of speakers to a fixed non-zero value, and according to the volume and the amplification factor Proportional relationship, instructing the power amplifier module to set the amplification factor of the audio signal input to another group of speakers that is turned on as the amplification factor corresponding to the current volume, and M is greater than 1;

Output the acquired audio signal to the power amplifier module, including:

When it is determined that the volume selected by the user is greater than the set volume threshold, an audio signal with an amplitude equal to the set amplitude threshold is output to the power amplifier module.

The beneficial effects brought by the audio control method and audio playback device provided by the present invention are as follows:

When the volume of the speaker is limited, one group of speakers can be turned on at low power to obtain better sound effects, especially the bass effect; two groups of speakers can be turned on at high power to meet the power requirements. The invention solves the problem in the prior art that the thin flat-panel TV occupies the space of the loudspeaker, which makes it difficult for the flat-panel TV to achieve good sound quality.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1. an audio-frequence player device, including:

Main control module, obtains audio signal and the audio frequency characteristics parameter of user's selection, when this audio frequency characteristics parameter When the sound carrier power of subaudio frequency signal is less than or equal to setting power threshold value, the audio signal of acquisition is exported Power amplifier module, and indicated horsepower amplifier module only control open one of which loudspeaker, when this sound Frequently when the sound carrier power of characteristic parameter subaudio frequency signal is more than setting power threshold value, by defeated for the audio signal obtained Go out to power amplifier module, and indicated horsepower amplifier module controls unlatching and organizes loudspeaker more；

Power amplifier module, receives audio signal and instruction that main control module sends, according to main control module Instruction, controls open one of which loudspeaker or organize loudspeaker more, and defeated after the audio signal amplification that will receive Go out to open and respectively organize loudspeaker；

It is positioned at one or more groups loudspeaker of same casing, receives the audio frequency letter of power amplifier module output Number and play out.

2. audio-frequence player device as claimed in claim 1, it is characterised in that described in be positioned at same casing It is independent that the interior circuit between each group loudspeaker connects.

3. audio-frequence player device as claimed in claim 2, it is characterised in that same group of loudspeaker includes One loudspeaker or multiple loudspeaker with circuit connection.

4. audio-frequence player device as claimed in claim 1, it is characterised in that in described same casing The tolerance power of each group loudspeaker is equal.

5. audio-frequence player device as claimed in claim 1, it is characterised in that the audio frequency that user selects is special Levying parameter is volume, and described main control module determines that the volume that user selects is less than or equal to set volume threshold Time, indicated horsepower amplifier module is only opened one of which loudspeaker, and be will enter into the sound of this group loudspeaker Frequently the multiplication factor of signal is set to fixed non-zero value；The volume that described main control module selects user less than or etc. In time setting volume threshold, adjust output to power amplifier module according to the proportional relationship of volume and amplitude Audio frequency signal amplitude.

6. audio-frequence player device as claimed in claim 1, it is characterised in that the audio frequency that user selects is special Levying parameter is volume, and described main control module determines when the volume that user selects is more than setting volume threshold, output Amplitude is the audio signal setting amplitude threshold, and indicated horsepower amplifier module opens M group loudspeaker, will The audio signal multiplication factor of the M-1 group loudspeaker being input to unlatching is set to fixed non-zero value, and according to volume With the proportional relationship of multiplication factor, indicated horsepower amplifier module will enter into another group loudspeaker of unlatching Audio signal multiplication factor be set to the multiplication factor that current volume is corresponding, M be more than 1.

7. the audio-frequence player device as described in claim 5 or 6, it is characterised in that described power amplification When device module determines closedown one of which loudspeaker according to the instruction of main control module, raise by will enter into this group The multiplication factor of the audio signal of sound device is set to 0, closes this group loudspeaker.

8. an audio control method, it is characterised in that including:

Obtain audio signal and the audio frequency characteristics parameter of user's selection；

When determining the sound carrier power of this audio frequency characteristics parameter subaudio frequency signal less than or equal to setting power threshold value, The audio signal of acquisition is exported power amplifier module, and indicated horsepower amplifier module only controls to open One of which loudspeaker in same casing；

When determining the sound carrier power of this audio frequency characteristics parameter subaudio frequency signal more than setting power threshold value, will obtain Audio signal export power amplifier module, and indicated horsepower amplifier module controls to open same casing Interior many groups loudspeaker.

9. audio control method as claimed in claim 8, it is characterised in that the audio frequency that user selects is special Levying parameter is volume, and the one of which that indicated horsepower amplifier module only controls to open in same casing is raised one's voice Device, specifically includes:

Determine that when the volume that user selects is less than or equal to set volume threshold, indicated horsepower amplifier module is only Opening one of which loudspeaker, the multiplication factor of the audio signal that will enter into this group loudspeaker is set to fixing non- Null value；

The audio signal of acquisition is exported power amplifier module, specifically includes:

Determine when the volume that user selects is less than or equal to set volume threshold, according to volume and the direct ratio of amplitude Example relation adjusts the output audio frequency signal amplitude to power amplifier module.

10. audio control method as claimed in claim 8, it is characterised in that the audio frequency that user selects is special Levying parameter is volume, and indicated horsepower amplifier module controls to open the many groups loudspeaker in same casing, specifically Including:

Determine that, when the volume that user selects is more than setting volume threshold, indicated horsepower amplifier module opens M Group loudspeaker, the audio signal multiplication factor of the M-1 group loudspeaker that will enter into unlatching is set to fixing non-zero Value, and according to volume and the proportional relationship of multiplication factor, indicated horsepower amplifier module will enter into unlatching Another group loudspeaker audio signal multiplication factor be set to the multiplication factor that current volume is corresponding, M be more than 1；

The audio signal of acquisition is exported power amplifier module, specifically includes:

Determine that, when the volume that user selects is more than setting volume threshold, output amplitude is to set the sound of amplitude threshold Frequently signal is to power amplifier module.