CN113473287A - Novel Bluetooth headset output sound pressure level control method - Google Patents
Novel Bluetooth headset output sound pressure level control method Download PDFInfo
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- CN113473287A CN113473287A CN202110699139.XA CN202110699139A CN113473287A CN 113473287 A CN113473287 A CN 113473287A CN 202110699139 A CN202110699139 A CN 202110699139A CN 113473287 A CN113473287 A CN 113473287A
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- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000003786 synthesis reaction Methods 0.000 claims description 16
- 238000012935 Averaging Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 208000016354 hearing loss disease Diseases 0.000 description 6
- 230000036541 health Effects 0.000 description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/70—Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/07—Applications of wireless loudspeakers or wireless microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
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Abstract
The invention discloses a novel method for controlling the output sound pressure level of a Bluetooth headset, which comprises the following steps: the analysis filter bank module filters and analyzes the voice signals received by the voice input module into a plurality of channels, the WDRC gain module performs sound pressure level judgment calculation, gain smoothing and gain output on the voice in the channels in each channel, and the comprehensive filter bank module filters and recombines the voice signals after gain in each channel and transmits the voice signals to the voice output module for output. The novel control method for the output sound pressure level of the Bluetooth headset can well control the sound pressure level of the output voice of the Bluetooth headset, so that the Bluetooth headset using the method can automatically adjust the output volume without human intervention. Meanwhile, different output sound effects can be selected under the condition of manual selection, so that people can enjoy better hearing experience.
Description
Technical Field
The invention relates to the technical field of output control of a Bluetooth headset, in particular to a novel method for controlling the output sound pressure level of the Bluetooth headset.
Background
With the development of electronic products, the market scale of the world bluetooth headset rises year by year, and various bluetooth headset products emerge endlessly. More and more young people wear earphones for a long time, which also makes the hearing health problem more and more serious, as clarified in the world hearing report issued by the world health organization, so far, more than 4.3 million people experience incapacitating hearing impairment worldwide, and this figure is likely to grow to nearly 7 million by the year 2050. The world health organization estimates that 60% of the youth's hearing loss is due to preventable causes. And over a billion teenagers are at risk of suffering an avoidable, irreversible hearing loss due to the practice of listening to music loudly for a long period of time.
With the attention on hearing health, related technologies such as hearing aids, hearing aids and the like are rapidly developed. In 1997, t.schneider proposed a multi-channel compression method applicable to hearing aids, which addresses the disadvantages of gain reduction due to narrowband non-speech stimuli and gain reduction when high frequency components are disturbed in a single channel compression system. Since then, methods of multi-channel compression have begun to be used in hearing aids. 2012, a multi-channel Wide Dynamic Range Compression (WDRC) method based on a lookup table method was proposed, in which voice is divided into 32 channels, and the channels are combined into 10 frequency bands, and the total average energy of each channel in each frequency band is used to calculate the WDRC gain of the frequency band through lookup table, thereby implementing a low-power hardware implementation method of the multi-channel WDRC. However, the method still has some disadvantages, and cannot perform smoothing processing between the frequency bands. In 2017, Hao et al propose a dynamic real-time sound pressure level stabilizer, and a language recognizer is arranged in the stabilizer, so that the sound quality under a fixed environment is greatly improved by focusing on human sound amplification, but the sound quality is easily interfered under a complex sound environment, the release time is not responded, and the change of the volume is not transited, so that the hearing experience of people is influenced.
At present, professional digital hearing aids in the market can well solve the problem of hearing impairment of people, can inhibit and relieve continuous hearing loss, and avoid deafness, but most of the professional digital hearing aids come from foreign products, and a wearer needs to go to a nearby fitting shop to perform professional fitting, and the price is very high. In the hearing-impaired people, the wearing rate of professional digital hearing aids is very low, most people select a relatively low-price sound amplifier, the amplifier can only perform simple linear amplification or reduction on sound, and symptomatic medication cannot be realized, so that the protection effect on hearing health is very slight.
Disclosure of Invention
The invention aims to provide a novel Bluetooth headset output sound pressure level control method for protecting hearing health, so as to solve the hearing health problems currently faced by people in the world, especially the hearing health problems of teenagers.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a novel Bluetooth headset output sound pressure level control method comprises the following steps:
the analysis filter bank module filters and analyzes the voice signals received by the voice input module into a plurality of channels, the WDRC gain module performs sound pressure level judgment calculation, gain smoothing and gain output on the voice in the channels in each channel, and the comprehensive filter bank module filters and recombines the voice signals after gain in each channel and transmits the voice signals to the voice output module for output.
The voice input module receives a Bluetooth signal sent by the mobile terminal and converts the received Bluetooth signal into a digital format required by subsequent signal processing.
The voice interface of the voice input module comprises an IIS interface and a PCM interface.
The analysis filter bank is responsible for dividing a received voice signal into a plurality of channels according to different frequency bands, voice of a fixed frequency band passes through each channel, and each channel is called as a sub-band.
The WDRC gain module comprises a sub-band energy calculating part, a sub-band gain smoothing part and a gain output part, wherein the sub-band energy calculating part calculates the passing voice energy in each channel, the sub-band gain calculating part calculates the gain of the sub-band by taking the energy as a parameter, the sub-band gain smoothing part performs gain smoothing treatment among the sub-bands after calculating the gain, and the gain output part outputs the configured gain.
And the synthesis filter bank integrates the voice signals in each sub-band again and restores the voice signals into original voice with full frequency.
The voice output module is used for converting the digital voice signals into pulse density modulation signals or analog signals which can be used for exciting a loudspeaker to sound and outputting the signals.
The subband gain smoothing adopts a mode of averaging adjacent band gains or taking a middle value by a plurality of frequency bands.
The analysis filter bank and the synthesis filter bank of the analysis filter bank module and the synthesis filter bank module adopt full-phase FIR filters.
The voice input module, the analysis filter bank module, the WDRC gain module, the synthesis filter bank module and the voice output module are respectively connected with the control module, the control module judges whether the input voice sound pressure level exceeds a set threshold value, when the input voice sound pressure level exceeds the set threshold value, the WDRC gain module controls the gain in a first gain control mode so that the input voice sound pressure level meets the set threshold value, and then the gain output is controlled in a second gain control mode based on a sound effect input instruction of a user; and when the sound effect input exceeds the set threshold value, controlling the gain output according to a second gain control mode based on the sound effect input of the user.
The novel control method for the output sound pressure level of the Bluetooth headset can well control the sound pressure level of the output voice of the Bluetooth headset, so that the Bluetooth headset using the method can automatically adjust the output volume without human intervention. Meanwhile, different output sound effects can be selected under the condition of manual selection, so that people can enjoy better hearing experience.
Drawings
Fig. 1 is a schematic diagram of the effect of a bluetooth headset according to an embodiment of the present invention.
Fig. 2 is a block diagram of a sound pressure level control system according to an embodiment of the present invention.
Fig. 3 is a flow chart of an optimized WDRC algorithm of an embodiment of the present invention.
FIG. 4 is a control module schematic of an embodiment of the present invention.
Fig. 5 is a block diagram of a voice output module according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-5, the method for controlling output sound pressure level of a bluetooth headset according to an embodiment of the present invention uses an optimized WDRC technology as a basic principle, and includes a voice input module (a bluetooth receiving module), an analysis filter bank module (a voice analysis module), a WDRC gain module (a voice gain module), a synthesis filter bank module (a voice synthesis module), a voice output module, and a control module, where the analysis filter bank module (the voice analysis module), the WDRC gain module (the voice gain module), and the synthesis filter bank module (the voice synthesis module) form a core voice signal processing module, and the WDRC gain module includes a subband energy calculating unit, a subband gain smoothing unit, and a gain output unit. The voice input module is responsible for receiving voice signals, the analysis filter bank module divides the received voice signals into a plurality of channels, the WDRC gain module performs sound pressure level judgment calculation, gain smoothing and gain output on voice in the channels in each channel, the comprehensive filter bank module recombines the voice signals after gain in each channel, and the voice output module is responsible for voice output.
1. Voice input/output module
The voice input module receives the Bluetooth signal sent by the mobile terminal and converts the received signal into a digital format required by subsequent signal processing, and meanwhile, the common voice interface of the voice input module comprises an IIS interface and a PCM interface, which are both applicable to the invention. The voice output module is responsible for converting the digital voice signal into a pulse density modulation signal or an analog signal which can be used for exciting a loudspeaker to sound.
2. Analysis filter bank and synthesis filter bank module
The analysis filter bank is responsible for dividing the voice signal into a plurality of channels according to different frequency bands, wherein voice of fixed frequency bands passes through each channel, and each channel is called a sub-band. The synthesis filter bank integrates the voice signals in each sub-band again to restore the original voice with full frequency.
WDRC gain module (Voice gain module)
The WDRC gain module is the core for realizing the control method and comprises four parts of sub-band energy calculation, sub-band gain calculation, inter-sub-band gain smoothing and gain output. The subband energy calculation calculates the passing speech energy in each channel, and takes the energy as a parameter to calculate the gain of the subband.
4. Control module
The control module judges whether the sound pressure level of the input voice exceeds a set threshold value, and in order to better solve the hearing health problem caused by insufficient self-control capability of a user and long-time loud listening to music, the embodiment of the invention sets the highest output sound pressure level in the Bluetooth headset so as to ensure that each user wearing the headset is in a safe listening state. Meanwhile, the wearer can also hear the tone quality effect which the wearer wants to hear through the control module.
Specifically, the voice input module, the analysis filter bank module, the WDRC gain module, the synthesis filter bank module and the voice output module are respectively connected with the control module, the control module judges whether the input voice sound pressure level exceeds a set threshold value, when the input voice sound pressure level exceeds the set threshold value, the gain is controlled by the WDRC gain module according to a first gain control mode so that the input voice sound pressure level meets the set threshold value, and then the gain output is controlled according to a second gain control mode based on a sound effect input instruction of a user; and when the sound effect input exceeds the set threshold value, controlling the gain output according to a second gain control mode based on the sound effect input of the user.
The second gain control method is for audio input, and does not include a subband energy calculating section, a subband gain calculating section, and an inter-subband gain smoothing section. The second gain control mode can adopt corresponding gains for different frequency bands of the audio frequency according to different input sound effect parameters. This value can be defined in advance and does not need to be calculated.
In the voice input part, a standard Bluetooth receiving module can be adopted to be matched with an IIS interface for use. In the speech output section, either pulse density modulated signal output or analog signal output may be used, for example, if pulse density modulated output (output signal 1) is used, the filter (consisting of filter 1 and filter group N of filter 2 … …) and the modulator may be implemented. If an analog signal output (output signal 2) is adopted, a low-pass filter and a proper power amplifier (power amplifier) are required to be added according to actual requirements, please refer to fig. 5.
In the analysis filter bank and synthesis filter bank sections, full phase FIR filters may be employed.
In the WDRC gain part, the mode of combining software and hardware can be adopted to obtain the highest cost performance.
In the control module part, professional suitable parameters are required to be input, and the input can be completed through an external bus, such as I2C, SPI and the like.
Specifically, the input voice signal may be from various sounds emitted by mobile phones, computers, and other products supporting bluetooth communication.
Specifically, the sound pressure level control system is implemented on the basis of hardware.
Specifically, the subband energy calculation and the gain calculation are independent for each subband, and the subband energy calculation is to perform energy calculation of a single channel in a channel after the analysis filter bank divides the voice into channels. The subband gain calculation is a gain calculation for a single channel within the channel after the energy calculation.
Specifically, the subband gain smoothing may be performed by averaging gains of adjacent frequency bands or by averaging gains of multiple frequency bands.
Specifically, the control module has two parts of input, one part is input voice, the other part is listener sound effect selection, the input voice is described above, and the sound effect selection can support a listener to independently adjust multiple sound effect modes, such as heavy bass, heavy human voice, heavy treble and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The novel control method for the output sound pressure level of the Bluetooth headset is characterized by comprising the following steps:
the analysis filter bank module filters and analyzes the voice signals received by the voice input module into a plurality of channels, the WDRC gain module performs sound pressure level judgment calculation, gain smoothing and gain output on the voice in the channels in each channel, and the comprehensive filter bank module filters and recombines the voice signals after gain in each channel and transmits the voice signals to the voice output module for output.
2. The method as claimed in claim 1, wherein the voice input module receives bluetooth signals from the mobile terminal and converts the received bluetooth signals into a digital format required for subsequent signal processing.
3. The output sound pressure level control method of the novel Bluetooth headset of claim 1, wherein the voice interface of the voice input module comprises an IIS interface and a PCM interface.
4. The method as claimed in claim 1, wherein the analysis filter bank is responsible for dividing the received voice signal into a plurality of channels according to different frequency bands, each channel passing through the voice of fixed frequency band, and each channel is called a sub-band.
5. The novel output sound pressure level control method for the Bluetooth headset of claim 1, wherein the WDRC gain module comprises a sub-band energy calculating unit, a sub-band gain smoothing unit, and a gain output unit, wherein the sub-band energy calculating unit calculates the passing voice energy in each channel, the sub-band gain calculating unit calculates the gain of the sub-band by using the energy as a parameter, the sub-band gain smoothing unit performs the gain smoothing process between the sub-bands after calculating the gain, and the gain output unit outputs the configured gain.
6. The method as claimed in claim 1, wherein the synthesis filter bank reintegrates the speech signals in each sub-band to recover the original speech signal of full frequency.
7. The output sound pressure level control method of the novel Bluetooth headset of claim 1, wherein the voice output module is responsible for converting a digital voice signal into a pulse density modulation signal or an analog signal which can be used for exciting a speaker to sound and outputting the signal.
8. The method as claimed in claim 1, wherein the subband gain smoothing is performed by averaging the gains of adjacent frequency bands or averaging the gains of multiple frequency bands.
9. The method as claimed in claim 1, wherein the analysis filter bank and the synthesis filter bank of the analysis filter bank module and the synthesis filter bank module employ full phase FIR filters.
10. The novel control method for the output sound pressure level of the bluetooth headset of claim 1, wherein the voice input module, the analysis filterbank module, the WDRC gain module, the synthesis filterbank module and the voice output module are respectively connected to the control module, the control module determines whether the input voice sound pressure level exceeds a set threshold, and when the input voice sound pressure level exceeds the set threshold, the control module controls the gain in a first gain control mode through the WDRC gain module so that the input voice sound pressure level meets the set threshold, and then controls the gain output in a second gain control mode based on a user's sound effect input instruction; and when the sound effect input exceeds the set threshold value, controlling the gain output according to a second gain control mode based on the sound effect input of the user.
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Application publication date: 20211001 |