TW201312984A - Method and mobile communication device for providing optimized audio characteristics in hands-free mode - Google Patents

Abstract

When operating in a hands-free mode, a range sensor is used for detecting the distance between a mobile communication device and a user, and a gyrometer is used for detecting the angle between the mobile communication device and the user. A corresponding audio parameter set among a plurality of audio parameter sets is applied according to the detected distance. A corresponding frequency transfer function among a plurality of frequency transfer functions is applied according to the detected angle.

Description

Method and mobile communication device for providing optimal audio characteristics in hands-free mode METHOD AND MOBILE COMMUNICATION DEVICE FOR PROVIDING OPTIMIZED AUDIO CHARACTERISTICS IN HANDS-FREE MODE

The present invention relates to a method and a mobile communication device for providing optimized acoustic characteristics in a hands-free mode, and more particularly to a method for providing optimized acoustic characteristics according to a detection distance and a detection angle in a hands-free mode. Mobile communication device.

Most mobile communication devices support the hands-free mode, allowing users to talk without having to put the microphone of the phone close to the ear while driving or exercising. Figure 1 is a schematic diagram showing a prior art mobile communication device 100 supporting a hands-free mode. The mobile communication device 100 includes a speaker system 110, a microphone system 120, a baseband chip 130, a processing unit 140, a speech encoder 150, and a memory unit 160. Speaker system 110 can include one or more components such as a horn, a gain amplifier, and a filter. Microphone system 120 may include one or more components such as a microphone, a gain amplifier, and a filter. The memory unit 160 can store settings or materials required for the operation of the mobile communication device 100. When the user makes a call through the mobile communication device 100, the microphone system 120 can receive the user's voice signal, and perform signal processing through the baseband chip 130 and the voice encoder 150 to transmit to the destination communication terminal. When the user answers the call through the mobile communication device 100, the baseband chip 130 and the voice encoder 150 can perform signal processing on the voice signal transmitted from the caller and then transmit the voice signal through the speaker system 110.

In the prior art mobile communication device 100, a simulated head test is generally used to determine a preset audio parameter and a preset frequency transfer function of the mobile communication device 100. The simulated head test system simulates the situation when the user and the mobile communication device 100 are separated by a certain distance and presents a specific angle, thereby determining the microphone system loudness rating (SLR) and the speaker system loudness of the mobile communication device 100. (receiving loudness rating, RLR). In general, the specific distance is 15 cm, the specific angle is 0 degrees (the mobile communication device 100 and the human ear are the same height), the SLR is between 10 dB and 25 dB, and the RLR is between 10 dB and 16 dB. However, in the hands-free mode, the user's behavior of holding the mobile communication device 100 is not fixed. Sometimes the interval between the user and the mobile communication device 100 may exceed or be less than a certain distance, and the user may also rotate the mobile communication device 100. Briefly, the values of SLR and RLR are reduced by 6 dB as the distance is doubled, while the frequency transfer function is related to the actual and actual angles between the user and the mobile communication device 100. In practical applications, if the distance between the user and the mobile communication device 100 is too far or the relative angle is too large, the user may not be able to clearly hear the voice of the speaker, so the volume or mobile action of the mobile communication device 100 needs to be manually adjusted. The communication device 100 causes inconvenience in use.

The present invention provides a method for optimizing the acoustic characteristics of a mobile communication device in a hands-free mode, comprising providing a complex array of audio parameters and a plurality of frequency transfer functions; in the hands-free mode, detecting the action a distance and an angle between the communication device and a user; and applying a set of corresponding audio parameters of the complex array of audio parameters according to the distance, and applying a corresponding one of the complex array frequency transfer functions according to the angle Frequency transfer function.

The present invention further provides a mobile communication device capable of providing an optimized acoustic characteristic in a speakerphone mode, comprising a distance sensor for measuring the mobile communication device and the speakerphone mode in the hands-free mode a distance between the users; a gyroscope for measuring an angle between the mobile communication device and the user in the speakerphone mode; and a processing unit for applying the complex array according to the distance A set of corresponding audio parameters in the audio parameter, and a corresponding frequency transfer function in the complex array frequency transfer function is applied according to the angle.

Figure 2 is a flow chart illustrating a method of automatically optimizing the acoustic characteristics of a mobile communication device in the hands-free mode of the present invention, comprising the steps of:

Step 210: Provide a complex array audio parameter and a plurality of frequency transfer functions.

Step 220: Determine whether a mobile communication device enters the hands-free mode: if yes, go to step 230; if no, go to step 220.

Step 230: Detect the distance d between the user and the mobile communication device.

Step 240: Apply a set of corresponding audio parameters according to the value of the distance d.

Step 250: Detect an angle θ between the user and the mobile communication device.

Step 260: Apply a corresponding frequency transfer function according to the value of the angle θ.

Step 270: Determine whether the mobile communication device leaves the hands-free mode: if yes, go to step 220; if no, go to step 230.

Figure 3 is a schematic illustration of a mobile communication device 300 of the present invention that provides optimized acoustic characteristics in a hands-free mode, the operation of which is illustrated in Figure 2 and will be described in detail later in the specification. The mobile communication device 300 includes a speaker system 310, a microphone system 320, a baseband chip 330, a processing unit 340, a voice encoder 350, a memory unit 360, a distance sensor 370, a gyroscope 380, and A control unit 390. Speaker system 310 can include one or more components such as a horn, a gain amplifier, and a filter. Microphone system 320 can include one or more components such as a microphone, a gain amplifier, and a filter. The memory unit 360 can store settings or materials required for the operation of the mobile communication device 300. When the user makes a call through the mobile communication device 300, the microphone system 320 can receive the user's voice signal, and perform signal processing through the baseband chip 330 and the voice encoder 350 to transmit to the destination communication terminal. When the user answers the call through the mobile communication device 300, the baseband chip 330 and the voice encoder 350 can perform signal processing on the voice signal transmitted from the caller and then transmit the voice signal through the speaker system 310.

The baseband chip 330 can be divided into a digital and analog ‧ digital baseband chip mainly comprising three parts, wherein the digital signal processor is responsible for signal processing, the microprocessor is responsible for processing the communication protocol and managing the output input interface, and the memory is used To store the operating system and firmware. The analog baseband chip mainly includes analog signal components such as analog-to-digital converters, codecs and modulators. The baseband chip 330 can control the gain levels of the microphone system 320 and the speaker system 310, that is, control the values of the SLR and RLR.

In step 210, each set of audio parameters may include a microphone system loudness SLR, a speaker system loudness RLR, an acoustic echo cancellation (AEC), or a noise suppression (NS). The value of each parameter within each set of audio parameters is related to the setting that provides optimized acoustic characteristics at different distances. Suppose d=d ₀ corresponds to a set of preset audio parameters (SLR0, RLR0, AEC0, NS0), and d=d ₁ corresponds to the first set of audio parameters (SLR1, RLR1, AEC1, NS1), and d=d ₂ o'clock corresponds to the second set of audio parameters (SLR2, RLR2, AEC2, NS2). If d ₂ >d ₀ >d ₁ , then SLR2<SLR0<SLR1 and RLR2<RLR0<RLR1, and the values of acoustic echo cancellation and noise suppression are related to the corresponding microphone system loudness and speaker system loudness.

On the other hand, each frequency transfer function can be correlated with the values of the distance d and the angle θ at the same time, and the mobile communication device 300 can separately set the filter coefficients of the speaker system 310 and the microphone system 320 according to the applied frequency transfer function.

While preparing to answer the call or during the call, the user can press the specific button in a specific manner to switch the hands-free mode, such as pressing the call button three times continuously, continuously pressing the call button for three seconds, or pressing the mode switch button, etc. . In the present invention, the control unit 390 can determine the operation mode of the mobile communication device 300 accordingly. In step 220, when the control unit 390 determines that the mobile communication device enters the hands-free mode, the distance sensor 370 and the gyroscope 380 are activated to perform steps 230 and 250, respectively.

In step 230, the distance sensor 370 can detect the distance d between the user and the mobile communication device 300. In step 250, the gyroscope 380 can detect the behavior of the user holding the mobile communication device 300, that is, detecting the angle θ between the user and the mobile communication device 300. The control unit 390 can receive the distance d detected by the distance sensor 370 and the angle θ detected by the gyroscope 380. FIG. 4 is a schematic diagram of the mobile communication device 300 of the present invention when steps 230 and 250 are performed. In this embodiment, the position P0 represents the ideal distance d ₀ and the ideal angle θ ₀ when the simulated human head test is performed, and the positions P1 and P2 represent different behaviors of the user holding the mobile communication device 300, where d ₁ <d ₀ < d ₂ , and θ ₁ and θ ₂ are not equal to θ ₀ .

In step 240, the mobile communication device 300 can apply the corresponding audio parameters according to the value of the distance d. For example, if the value of the distance d is equivalent to a predetermined value (for example, the ideal distance d ₀ ), a set of preset audio parameters is applied in step 240; if the value of the distance d is less than a predetermined value (for example, d=d) ₁ <d ₀ ), at this time, the first set of audio parameters is applied in step 240; if the value of the distance d is greater than a predetermined value (for example, d=d ₂ >d ₀ ), then the second group is applied in step 240. Audio parameters. The first set of audio parameters may include a larger SLR/RLR and corresponding acoustic echo cancellation/noise suppression than the preset audio parameters; the second set of audio parameters may include a smaller SLR/RLR and corresponding acoustic echo cancellation / Noise suppression. In other words, when the user is closer to the mobile communication device 300, the present invention can automatically lower the volume of the speaker system 310 and the microphone system 320, and correspondingly adjust the acoustic echo cancellation or noise suppression; When the mobile communication device 300 is far away, the present invention can automatically increase the volume of the speaker system 310 and the microphone system 320, and correspondingly adjust the acoustic echo cancellation or noise suppression.

In step 260, the mobile communication device 300 can apply the corresponding frequency transfer function according to the value of the angle θ. The frequency transfer function can be correlated with the values of the distance d and the angle θ at the same time, and the mobile communication device 300 can separately set the filter coefficients of the speaker system 310 and the microphone system 320 according to the applied frequency transfer function.

In the embodiment shown in Fig. 2, steps 230-260 are performed in sequence. However, other embodiments of the invention may also perform steps 230, 240, 250, and 260 in a different order. For example, the present invention may first perform a detection action (first performing step 230 and then performing step 250, executing step 250 and then performing step 230, or performing steps 230 and 250 simultaneously), and then performing the apply action (first performing step 240 and then performing the step). 260. Perform step 260 and then perform step 240, or perform steps 240 and 260) at the same time. The order of execution of steps 230-260 does not limit the scope of the invention.

In the hands-free mode, the present invention automatically applies corresponding audio parameters and frequency transfer functions depending on the distance and angle between the user and the mobile communication device. Therefore, the present invention provides optimum acoustic characteristics when the user changes the behavior of the handheld mobile communication device.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100, 300. . . Mobile communication device

110, 310. . . Speaker system

120, 320. . . Microphone system

130, 330. . . Baseband chip

140, 340. . . Processing unit

150, 350. . . Speech encoder

160, 360. . . Memory unit

370. . . Distance sensor

380. . . Gyro

390. . . control unit

210~270. . . step

Figure 1 is a schematic diagram of a mobile communication device in the prior art.

2 is a flow chart of a method for automatically optimizing the acoustic characteristics of the mobile communication device in the hands-free mode in the present invention.

Figure 3 is a schematic diagram of a mobile communication device in the present invention

Figure 4 is a schematic diagram of the operation of the mobile communication device of the present invention.

210~270. . . step

Claims (11)

A method for optimizing the acoustic characteristics of a mobile communication device in a hands-free mode, comprising: providing a complex array of audio parameters and a plurality of frequency transfer functions; detecting the mobile communication device in the hands-free mode a distance and an angle with a user; and applying a set of corresponding audio parameters of the complex array audio parameter according to the distance, and applying a corresponding frequency shift in the complex array frequency transfer function according to the angle function. The method of claim 1, further comprising: providing the complex array of audio parameters for a plurality of estimated distances between the mobile communication device and the user; and for the mobile communication device and the user The plurality of estimated distances and the plurality of predicted angles respectively provide the plurality of frequency transfer functions. The method of claim 1, further comprising: providing a first microphone, a first speaker, and a first speaker, including a first microphone system (sending loudness rating), a first speaker a first set of audio parameters of a receiving loudness rating, a first acoustic echo cancellation, or a first noise suppression; and between the mobile communication device and the user a second estimated distance, providing a second set of audio parameters including a second microphone system loudness, a second speaker system loudness, a second acoustic echo cancellation, or a second noise suppression; wherein, when the first When the estimated distance is greater than the second estimated distance, the first microphone system loudness is less than the second microphone system loudness, and the first speaker system loudness is less than the second speaker system loudness. The method of claim 3, wherein the first acoustic echo cancellation and the first noise suppression are related to the first microphone system loudness and the first speaker system loudness, the second acoustic echo cancellation and the second noise suppression Corresponding to the second microphone system loudness and the second speaker system loudness. The method of claim 1, further comprising: setting a filter coefficient of a microphone system and a speaker system in the mobile communication device according to the corresponding frequency transfer function. A mobile communication device capable of providing an optimized acoustic characteristic in a speakerphone mode, comprising: a distance sensor for measuring the mobile communication device and a user in the speakerphone mode a distance between the gyroscope for measuring an angle between the mobile communication device and the user in the hands-free mode; and a processing unit for applying the complex array of audio parameters according to the distance A set of corresponding audio parameters, and a corresponding frequency transfer function in the complex array frequency transfer function is applied according to the angle. The mobile communication device of claim 6, further comprising: a speaker system that operates according to the corresponding audio parameter and the corresponding frequency transfer function; and a microphone system that depends on the corresponding audio parameter and the Corresponding to the frequency transfer function to operate. The mobile communication device of claim 6, wherein the processing unit applies the set of corresponding audio parameters related to a microphone system loudness, a speaker system loudness, an acoustic echo cancellation, or a noise suppression according to the distance. The mobile communication device of claim 6, wherein the processing unit further sets the filter coefficients of the microphone system and the speaker system according to the corresponding frequency transfer function. The mobile communication device of claim 6, further comprising: a memory unit for storing the complex array audio parameter and the complex array frequency transfer function. The mobile communication device of claim 6, further comprising: a control unit configured to determine whether the mobile communication device enters the hands-free mode, and transmits the distance and the angle to the processing unit.