CN201178491Y - Miniature loudspeaker device integrating filter circuit and power regulation circuit - Google Patents

Abstract

A miniature loudspeaker device integrating filter circuit and power regulation circuit features that the noise of sound input signal is filtered by filter circuit to obtain the signal in specific frequency band, and the power regulation circuit is used to regulate the power of sound output signal. Therefore, the performance of the miniature loudspeaker device can be effectively improved, and the miniature loudspeaker device has higher reliability.

Description

Miniature loudspeaker device integrating filter circuit and power adjustment circuit

technical field

The utility model relates to a miniature speaker device, in particular to a miniature speaker device integrating a filter circuit and a power adjustment circuit.

Background technique

With the advancement of science and technology and the improvement of human's demand for quality of life, products with audio functions have gradually spread to electronic products in daily life. Wherein the device capable of outputting sound is called a loudspeaker. The speaker is a "transducer" that converts electrical energy into mechanical vibration and then disturbs the air to turn it into sound. Electronic products can emit various sounds through the speaker to meet the needs of human hearing. Generally, electronic devices that use speakers such as telephones , Stereo, Walkman and buzzer .. and so on.

On the other hand, for the convenience of portability, the size of electronic products is getting smaller and smaller, and the speaker used as the sound output must also be smaller and smaller, so the miniature speaker device emerges as the times require. A micro-speaker device is a very small sounding device, usually less than 10 cubic centimeters, or even less than 5 cubic centimeters.

At present, the micro-speaker devices on the market only have the function of converting electrical signals into sound. As for the quality of the output sound, the completion is determined by the electronic device connected to the front end of the micro-speaker device. If the electrical signal of the micro-speaker is input into the micro-speaker device, the micro-speaker device must convert the electrical signal into sound and output it, so there are the following shortcomings that need to be improved.

Electrical signals are usually accompanied by noise or interference signals. When the tiny speaker converts the noisy electrical signal into sound and outputs it, there will be distortion, which makes it impossible for humans to hear correct and comfortable sounds, or even completely inaccurate. Understand the meaning of the output sound.

In addition, since the hearing frequency range of human ears is between 20Hz and 20000Hz, there will be slight differences according to different ages, emotions, and personal physiques. If the electrical signal received by the micro-speaker device exceeds this frequency range, the sound converted from the signal is output to the human ear and cannot be received.

The usual solution is to add a filter to the front of the speaker. There are four common types of filters: low-pass filter, which can pass signals below a specific frequency and attenuate signals above this frequency; high-pass filter, which can Pass signals above a specific frequency and attenuate signals below that frequency; band-pass filters pass signals in a specific frequency band and attenuate signals outside the frequency band; band rejection filters attenuate signals in a specific frequency band and make out-of-band signals The signal passes.

In line with the auditory characteristics of the human ear, band-pass filters and band-rejection filters are more commonly used. The band-pass filter can limit the frequency of the input signal to the range that can be received by the human ear, while the band-rejection filter can eliminate the noise of a specific frequency. Works very poorly.

Another problem is that the input signal power that the micro-speaker device itself can withstand has a certain limit. When the electronic device at the front end of the micro-speaker device inputs an electrical signal with excessive power into the micro-speaker device, it may affect the micro-speaker device. When the electronic device at the front end of the micro-speaker device inputs an electrical signal with too low power into the micro-speaker device, the converted sound is too weak, which may make it hard for the human ear to hear Or not even hear it at all.

To sum up, how to provide a micro-speaker device with high performance and high reliability has become a problem to be solved urgently.

Contents of the invention

In order to solve the lack of the aforementioned prior art, the utility model provides a micro-speaker device integrating a filter circuit and a power adjustment circuit, which integrates the filter circuit and the power adjustment circuit into a micro-speaker device, so that the sound input signal can be filtered The circuit filters the interference noise to obtain a specific frequency band signal within the hearing range of the human ear, and uses the power adjustment circuit to adjust the power of the sound output signal.

The miniature loudspeaker device integrating filter circuit and power adjustment circuit of the present invention includes: a signal filter module, which is used to filter the received sound signal, and output a sound signal of a specific frequency; a power adjustment module, which is used for the specific frequency The power of the frequency sound signal is amplified or attenuated; and the speaker module is used to output the amplified or attenuated sound signal, wherein the volume of the micro speaker device integrating the filter circuit and the power adjustment circuit is less than 10 cubic centimeters.

Compared with the existing micro-speaker device, the micro-speaker device integrated filter circuit and power adjustment circuit of the utility model can filter interference noise through the signal filter module, and obtain signals of specific frequency bands according to different needs of users. Or design the signal filter module according to the characteristics of the human hearing range, so that the sound signal input to the speaker can be efficiently converted into the human hearing range. The power of the sound output signal is adjusted by the power adjustment circuit. The power adjustment circuit designs the best amplification/attenuation ratio based on the power of the maximum output signal of different devices and the power that the speaker can withstand, which can prevent the speaker from being damaged when the power of the input signal is higher than the power that the speaker can withstand, and keep the power within human hearing within the perceivable range. Accordingly, the performance of the miniature speaker device can be effectively improved and has high reliability.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

Fig. 1 is a device structure diagram of an embodiment of a miniature loudspeaker device integrating a filter circuit and a power adjustment circuit of the present invention;

FIG. 2 is a device structure diagram of another embodiment in which the miniature speaker device shown in FIG. 1 includes a radio frequency filtering module;

FIG. 3 is a device architecture diagram of another embodiment in which the miniature speaker device shown in FIG. 2 includes a power switching module; and

FIG. 4 is a specific implementation circuit diagram of the miniature speaker device of the present invention integrated on a circuit board.

Among them, reference signs

1 Miniature loudspeaker device integrating filter circuit and power adjustment circuit

11 Signal filter module

12 power adjustment module

13 speaker modules

14 RF filter module

15 power switching module

2 circuit boards

20 operational amplifier chips

21 cable

22 speakers

R1, R2, R3, R4 resistors

C1, C2, C3, C4, C5, C6, C7 capacitors

L1, L2 inductance

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The utility model can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the utility model.

Please refer to FIG. 1 , which is a device structure diagram of a miniature speaker device integrating a filter circuit and a power adjustment circuit of the present invention. As shown in FIG. 1 , the miniature loudspeaker device 1 integrating a filter circuit and a power adjustment circuit of the present invention includes a signal filter module 11 , a power adjustment module 12 and a speaker module 13 .

The signal filtering module 11 is used to filter the received input sound signal and output a sound signal of a specific frequency. According to different needs of users, the signal receiving module can be a low-pass filter, a high-pass filter, a band-pass filter, a band reject filter or other similar filters.

The power adjustment module 12 is used to amplify or attenuate the sound signal of the specific frequency. In this embodiment, an operational amplifier is used to amplify or attenuate the signal voltage by adjusting the output gain, so as to obtain a micro-speaker device. operating range of power.

The speaker module 13 is used to convert sound signals (usually electrical signals) into audio sounds. Wherein, the loudspeaker module 13 can be made up of several loudspeakers, and several loudspeakers can use flat wires, stranded wires, single-core wires, multi-core wires, soft printed circuit boards, connecting plugs, hard printed circuit boards, integrated circuits, etc. or other similar means of interconnection.

In this embodiment, the miniature loudspeaker device integrating filter circuit and power adjustment circuit of the present utility model can be applied in a mobile phone with music playing function, when the music playing module or processing unit of the mobile phone transmits the sound signal to the signal When the filter module 11 (here is a bandpass filter), the sound signal can be limited to the acceptable frequency range of the human ear by the signal filter module 11, and then the power is amplified or attenuated by the power adjustment module 12. If the input power is already Greater than the rated power range that the speaker module 13 can withstand, that is, attenuate the power output to the speaker module 13 to avoid damaging the speaker module 13. If the input power is too small to drive the speaker module 13, then amplify the power so that the speaker module 13 can output sound. The volume of the miniature loudspeaker device including the integrated filter circuit and the power adjustment circuit of the above modules is less than 10 cubic centimeters. More preferably below 5 cubic centimeters.

Please refer to Fig. 2, in a preferred embodiment of the present utility model, the miniature loudspeaker device of the utility model integrated filter circuit and power adjustment circuit comprises radio frequency filter module 14 again, and it is used for attenuation or eliminates to be coupled in the sound The signal's radio frequency interferes with the signal. The radio frequency filter module 14 is connected between the power adjustment module 12 and the speaker module 13. When the sound signal is interfered by the radio frequency signal, the radio frequency filter module 14 can attenuate or even eliminate the radio frequency signal interference, so that the speaker module 13 will not be affected by the radio frequency when outputting sound. signal impact.

Please refer to Fig. 3, in a better embodiment of the present utility model, the miniature loudspeaker device of the utility model integrated filter circuit and power adjustment circuit also includes a power switching module 15, which is used to turn on/off according to the power control signal Turn off the power supply. When the power switch module 15 turns on the power supply, it can make the whole miniature speaker device obtain the power needed for operation to carry out the sound output. When the power switch module 15 turns off the power supply, the miniature speaker device cannot obtain the required power for operation. Power and stop action (stop output sound). One advantage of this mode of operation is that it can block some unwanted audio signal output. For example, as the aforementioned mobile phone may cause signal spikes or interference due to the execution of certain functions (such as turning on the power), the sound output by the speaker usually makes the human ear feel uncomfortable, but the power switch module 15 is turned off. The power supply stops the operation of the micro-speaker device, which can isolate the output of such sound. Another advantage is that when the mobile phone does not use the sound output function, the power supply to the micro-speaker device can also be turned off through the power switching module 15, and the power supply can be turned on again when the sound output is needed, which can effectively save power waste. In addition to being applied to mobile phones, it can also be applied to other portable electronic devices such as notebook computers, walkmans, etc., which can increase their standby time.

Please refer to Fig. 4, which is a specific implementation circuit diagram of the miniature loudspeaker device of the present invention integrated on a circuit board, as shown in Fig. 4, the signal filtering module 11, the power adjustment module 12, the radio frequency filtering module 14 and the power switching module are integrated on board 2. However, in addition to the above-mentioned signal filter module 11, power adjustment module 12, and power switching module 15, in other embodiments, the signal filter module 11, power adjustment module 12, speaker module 13, radio frequency filter module 14 and/or power supply The switching module 15 is integrated on the circuit board 2 .

The circuit board 2 can be, for example, a rigid printed circuit board, a flexible printed circuit board, an integrated circuit board or other similar circuit boards. The circuit board 2 can receive audio signals, power input signals, power control signals and/or other types of signals through cables, flexible circuit boards or connecting plugs. In this embodiment, the cable 21 is used to receive sound signals, power input and power control signals.

The circuit board 2 includes an operational amplifier chip 20, resistors (R1-R4), capacitors (C1-C5) and inductors (L1, L2), which are integrated into a circuit board with band-pass filter function, power amplification function, radio frequency filter function and power switching function. installation. The power is input to the circuit board 2 through the cable 21, which can supply the operation of the whole miniature speaker device. GND (TP5) is the grounding terminal, which is used as the grounding of each component of the whole miniature speaker device. SHUTDOWN (TP2) is the input terminal of the power control signal. The operational amplifier chip 20 can start or stop the operation of the amplifier according to different power control signals, so as to achieve the above power switching function. AUDIO IN+(TP3) and AUDIO IN-(TP4) are two audio signal inputs with opposite phases, processed by circuit board 2, which can output excellent sound, the details are as follows.

The circuit of the circuit board 2 is composed of an operational amplifier chip 20, resistors R1-R4, capacitors C1-C5 and inductors L1, L2. In addition, the capacitor C7 is used as a bypass capacitor of the operational amplifier chip 20 to provide a DC voltage stabilization effect when the operational amplifier chip 20 is working. Capacitor C6 is connected between the power supply input and the ground terminal, and is used for filtering the input power supply.

Design the RC circuit (composed of C1, C2, C3, C4, R1, R2, R3, R4) according to the band-pass frequency and power gain predetermined by the user, and the audio source signal with opposite phase (AUDIO IN+, AUDIO IN-) Input the operational amplifier chip 20 through the cable 21 and cooperate with the RC circuit to perform band-pass filtering and adjust the power gain to adjust the sound signal to the acceptable range of the human ear or even optimize the output sound in accordance with the auditory characteristics of the human ear, and amplify or attenuate the signal The power output improves the efficiency and reliability of the speaker.

For example, when the user sets the preset frequency band between F1 and F2 according to the hearing characteristics of the human ear, the bandpass filter will attenuate the frequencies other than F1 to F2, so that the final input sound is only the F1 to F2. Signals in the F2 band. Of course, the signal in this frequency band is between 20Hz and 20kHz, which is the hearing frequency range of human ears. Assuming that the maximum power of the loudspeaker is P1, when the power of the sound signal input to the miniature loudspeaker device is greater than P1, it must be attenuated to avoid burning the loudspeaker.

The back-end LC circuit of circuit board 2 (composed of L1, L2, and C5) has the function of high-frequency filtering. When the radio frequency signal interferes with the sound signal through the radio frequency receiver (such as an antenna), the characteristics of the inductor L1 and L2 can block the high frequency Therefore, the positive phase audio signal (AUDIO IN+) can use the inductance L1 to block the high-frequency noise input to the speaker 22, and the negative phase audio signal (AUDIO IN-) can use the inductance L2 to block the high-frequency noise input to the speaker 22. And the capacitor C5 is used when there is radio frequency signal interference, the extremely high frequency makes C5 turn on, and the difference between the positive phase sound signal and the negative phase sound signal interference noise will be reduced, and finally when the two sound signals with opposite phases are subtracted , the sound signal will be amplified and the noise will be attenuated or even eliminated, so that the effect of high-frequency filtering can be achieved.

To sum up, the miniature loudspeaker device integrating the filter circuit and the power adjustment circuit of the present invention can filter the interference noise through the signal filter module, and obtain the signal of a specific frequency band according to the different needs of the user, or according to the range of the in-ear hearing sense The characteristics of the signal filter module are designed so that the sound signal input to the speaker can be efficiently converted into the range of human hearing. The power of the sound output signal is adjusted by the power adjustment circuit. The power adjustment circuit designs the best amplification/attenuation ratio based on the power of the maximum output signal of different devices and the power that the speaker can withstand, which can prevent the speaker from being damaged when the power of the input signal is higher than the power that the speaker can withstand, and keep the power within human hearing within the perceivable range. Accordingly, the performance of the miniature speaker device can be effectively improved and has high reliability.

Of course, the utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the utility model without departing from the spirit and essence of the utility model, but These corresponding changes and deformations should all belong to the protection scope of the appended claims of the present utility model.

Claims (13)

1, the miniature loudspeaker arrangement of a kind of integration kalman filter circuit and power adjusting circuit is characterized in that, comprising:

The signal filtering module is carried out filtering in order to the voice signal to input, and the voice signal of output characteristic frequency;

Power regulation module is carried out power amplification or decay in order to the voice signal to this characteristic frequency; And

Loudspeaker module, in order to will be through amplifying or this voice signal output of decay,

Wherein, this power regulation module amplification or decay power are in the rated power scope of this loudspeaker module.

2, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, this signal filtering module is a low pass filter.

3, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, this signal filtering module is a high pass filter.

4, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, this signal filtering module is a band pass filter.

5, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, this signal filtering module is refused filter for band.

6, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, this loudspeaker module is made up of several loud speakers.

7, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 6 and power adjusting circuit, it is characterized in that, use winding displacement, twisted wire, single-core line, split conductor, soft printed circuit board (PCB), hard printed circuit board, attachment plug or IC regime to interconnect between these several loud speakers.

8, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, also comprises a rf filtering module, is coupled in the Radio Frequency Interfere of this voice signal in order to decay or elimination.

9, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, also comprises a power supply handover module, supplies in order to the On/Off power supply according to power control signal.

10, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 9 and power adjusting circuit, it is characterized in that this signal filtering module, this power regulation module, this loudspeaker module, this rf filtering module and/or this power supply handover module are integrated on the circuit board.

11, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 10 and power adjusting circuit is characterized in that, this circuit board is hard printed circuit board, soft printed circuit board (PCB) or surface-mounted integrated circuit.

12, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 10 and power adjusting circuit, it is characterized in that, this circuit board is by winding displacement, flexible circuit board or attachment plug, to receive this voice signal, this power supply input signal and/or this power control signal.

13, the miniature loudspeaker arrangement of integration kalman filter circuit according to claim 1 and power adjusting circuit is characterized in that, the volume of the miniature loudspeaker arrangement of this integration kalman filter circuit and this power adjusting circuit is below 10 cubic centimeters.

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