CN212324363U - Low-power-consumption self-adaptive variable-gain hearing aid - Google Patents
Low-power-consumption self-adaptive variable-gain hearing aid Download PDFInfo
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- CN212324363U CN212324363U CN202021390442.9U CN202021390442U CN212324363U CN 212324363 U CN212324363 U CN 212324363U CN 202021390442 U CN202021390442 U CN 202021390442U CN 212324363 U CN212324363 U CN 212324363U
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Abstract
The utility model discloses a low-power consumption self-adaptive gain-changing hearing aid, which solves the problem that the conventional hearing aid can not adjust the required sound source amplification effect for different hearing patients, the key point of the technical proposal is that the hearing aid comprises a microphone and a loudspeaker, a gain amplifying circuit is arranged between the microphone and the loudspeaker, the gain amplifying circuit comprises a gain amplifier, an A/D converter, a digital signal processing electrical appliance and a power amplifier, the microphone is electrically connected with the gain amplifier, the A/D converter is electrically connected with the digital signal processing electrical appliance, one end of the digital signal processing electrical appliance is electrically connected with the gain amplifier, the other end of the digital signal processing electrical appliance is electrically connected with the power amplifier, the power amplifier is electrically connected with the loudspeaker, and the gain amplification circuit is also provided with a 1V linear power supply voltage stabilizer and adopts a two-stage operational amplifier common-mode feedback circuit.
Description
Technical Field
The utility model relates to an electron audiphone technical field, more specifically say, it relates to a low-power consumption self-adaptation becomes audiphone of gain.
Background
Because the frequency range of sound which can be perceived by normal human ears is within 16-20 khz, if the sound intensity of the voice signal can just cause the hearing of the human ears, the sound intensity is the 'hearing threshold'; if the sound intensity is continuously increased until the ears can just feel discomfort, the sound intensity is 'pain threshold', however, the hearing threshold and the pain threshold of normal people and hearing patients are different, and for the hearing patients, the hearing threshold is larger than that of the normal ears; the pain threshold is less than that of normal human ears. The effect of loudness compensation is to correspond the hearing range of a healthy human ear to hearing.
Chinese patent publication No. CN1315255C discloses a variable gain low noise amplifier (MN1) that achieves variable gain by using a network of transistors in a parallel array, each transistor being independently selectable by a PMOS switch (220) and providing variable resistance to the resonant circuits (RP, LP). Power dissipation may also be mitigated by using a network of drive transistors, each of which may be independently selected by a PMOS switch (220).
Although the above-described device can adjust the resonant frequency of the amplifier, when used in a gain amplifier circuit of a hearing aid, it cannot be changed depending on the hearing threshold of different hearing patients, and is limited in use.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a can amplify the low-power consumption self-adaptation variable gain's that makes an uproar of falling to sound according to different hearing patients' hearing threshold.
In order to achieve the purpose, the utility model provides a low-power consumption self-adaptation becomes audiphone of gain, including the audiphone, the audiphone includes microphone and speaker, be equipped with gain amplifier circuit between microphone and speaker, gain amplifier circuit includes gain amplifier, AD converter, digital signal processing electrical apparatus and power amplifier, the microphone with the gain amplifier electricity is connected, the AD converter with the digital signal processing electrical apparatus electricity is connected, digital signal processing electrical apparatus one end with the gain amplifier electricity is connected, the other end with the power amplifier electricity is connected, power amplifier with the speaker electricity is connected, gain amplifier circuit still is equipped with 1V linear power supply regulator, and it adopts two-stage operational amplifier common mode feedback circuit.
The utility model discloses further set up to: the incremental amplifier comprises a transconductance amplifier, a switch resistor array, a band-gap reference source and a low-dropout linear regulator.
The utility model discloses further set up to: the main circuit of the transconductance amplifier adopts a two-stage common-mode feedback amplifying circuit of a fully differential five-tube unit.
The utility model is further arranged that the digital signal processing electric appliance adopts a 16-bit high-speed chip TMS3205416 chip with data and program stored respectively, which adopts a standard four-channel mirror image filter bank.
The utility model is further arranged in that the power amplifier is also provided with a noise elimination filter bank.
To sum up, the utility model has the advantages of as follows: the whole can be according to the requirement of hearing patient and carry out amplification treatment with the sound source, can reduce the whole use consumption of audiphone, and the internal circuit operation is stable, and the low power dissipation, audiphone live time is long, can reduce the influence of audiphone phenomenon of whistling to the user.
Drawings
Fig. 1 is a schematic diagram of a gain amplification circuit of embodiment 1;
FIG. 2 is a schematic diagram of an electrical apparatus for digital signal processing according to embodiment 1;
fig. 3 is a circuit diagram showing a noise canceling filter bank according to embodiment 1.
In the figure, 1, a gain amplification circuit; 11. a microphone; 12. a gain amplifier; 13. an A/D converter; 14. a digital signal processing electrical appliance; 15. a power amplifier; 16. a speaker; 17. a linear power regulator.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
as shown in fig. 1, the hearing aid comprises a microphone 11 and a speaker 16, a gain amplifier circuit 1 is arranged between the microphone 11 and the speaker 16, the gain amplifier circuit 1 comprises a gain amplifier 12, an a/D converter 13, a digital signal processing electrical appliance 14 and a power amplifier 15, the microphone 11 is electrically connected with the gain amplifier 12, the a/D converter 13 is electrically connected with the digital signal processing electrical appliance 14, one end of the digital signal processing electrical appliance 14 is electrically connected with the gain amplifier, the other end of the digital signal processing electrical appliance is electrically connected with the power amplifier 15, the power amplifier 15 is electrically connected with the speaker 16, and the gain amplifier circuit 1 is further provided with a 1V linear power regulator 17 which adopts a two-stage operational amplifier common mode feedback circuit.
Therefore, firstly, the voice signal received by the microphone 11 is processed by adopting an anti-aliasing filter, the processed signal is placed into the A/D converter 13 and converted into a digital signal, the A/D converter 13 sends the digital signal to the digital signal processing electric appliance 14, the digital signal processing electric appliance 14 adopts an SOC special chip containing a basic algorithm of a digital hearing aid, the signal is processed by the digital signal processing electric appliance 14, a compensation scheme is designed according to the requirement of a hearing impaired person, and finally the processed digital signal is converted into a sound signal familiar to the human ear through the D/A converter and sent to the loudspeaker 16, so that the hearing aid effect is realized.
As shown in fig. 1 and fig. 2, the gain-increasing amplifier 12 includes a transconductance amplifier, a switch resistor array, a bandgap reference source, and a low-dropout linear regulator, where the transconductance amplifier main circuit employs a two-stage common-mode feedback amplifying circuit of a fully-differential five-transistor unit.
The current hearing aid SOC chip mainly depends on a zinc-air battery of a 1.4V power supply for power supply, the power consumption of the chip directly determines the sustainable working time of the hearing aid, wherein the gain amplification circuit 1 consumes more than 60% of power consumption, in order to prolong the sustainable working time of the whole chip, the gain amplification circuit 1 adopts a 1V linear power supply voltage stabilizer 17, the low-power-consumption gain amplification circuit 1 is realized through a two-stage operational amplifier common-mode feedback circuit, and the stability of the system power supply voltage is ensured.
Meanwhile, in order to ensure that the operational amplifier has enough gain bandwidth level and the output can still reach the output swing with the peak-to-peak value of 1V, a transconductance amplifier main circuit in the gain amplifier 12 adopts a two-stage common mode feedback amplifying circuit with a fully differential five-tube unit as shown in fig. 2, and the digital signal processing electrical appliance 14 adopts a 16-bit high-speed chip TMS3205416 chip which respectively stores data and programs and adopts a standard four-channel mirror image filter group.
Thus, the chip of the digital signal processing device 14 adopts a pipeline structure, which can reduce the instruction execution period, and adopts a standard four-channel mirror image filter bank mode, which can reduce the power consumption of the hearing aid, and the pin structure of the a/D signal converter is shown in fig. 2.
As shown in fig. 3, the power amplifier 15 in the gain amplifying circuit 1 is further provided with a noise canceling filter bank, and the circuit is far from the figure as shown in the figure.
In the using process, due to objective reasons, the hearing aid is not tightly sealed with the ear, the hearing aid can feed amplified sound back to the microphone 11 again, after amplification again, noise of a feedback cycle can be generated repeatedly, which is a very common phenomenon in an audio amplification system, if a signal with a certain frequency is repeatedly amplified by the hearing aid, other input voice signals can be 'hidden' in the noise to cause the generation of a whistling phenomenon, and the phenomenon can cause certain hearing impairment to a wearer, so a noise elimination filter group is added in the power amplifier 15, and a circuit schematic diagram of the noise elimination filter group is shown in the figure.
The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.
Claims (5)
1. A low power consumption adaptive variable gain hearing aid comprising a hearing aid, characterized in that: the hearing aid comprises a microphone (11) and a loudspeaker (16), a gain amplifying circuit (1) is arranged between the microphone (11) and the loudspeaker (16), the gain amplification circuit (1) comprises a gain amplifier (12), an A/D converter (13), a digital signal processing electrical appliance (14) and a power amplifier (15), the microphone (11) is electrically connected with the gain amplifier (12), the A/D converter (13) is electrically connected with the digital signal processing electrical appliance (14), one end of the digital signal processing electrical appliance (14) is electrically connected with the gain amplifier (12), the other end is electrically connected with the power amplifier (15), the power amplifier (15) is electrically connected with the loudspeaker (16), the gain amplification circuit (1) is further provided with a 1V linear power supply voltage stabilizer (17), and a two-stage operational amplifier common-mode feedback circuit is adopted.
2. A low power consumption adaptive gain-changing hearing aid according to claim 1, wherein: the gain amplifier (12) comprises a transconductance amplifier, a switch resistor array, a band-gap reference source and a low-dropout linear regulator.
3. A low power consumption adaptive gain-changing hearing aid according to claim 2, wherein: the main circuit of the transconductance amplifier adopts a two-stage common-mode feedback amplifying circuit of a fully differential five-tube unit.
4. A low power consumption adaptive gain-changing hearing aid according to claim 1, wherein: the digital signal processing electrical appliance (14) adopts a 16-bit high-speed chip TMS3205416 chip which stores data and programs respectively and adopts a standard four-channel mirror image filter bank.
5. A low power consumption adaptive gain-changing hearing aid according to claim 1, wherein: and a noise elimination filter bank is also arranged in the power amplifier (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021390442.9U CN212324363U (en) | 2020-07-15 | 2020-07-15 | Low-power-consumption self-adaptive variable-gain hearing aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021390442.9U CN212324363U (en) | 2020-07-15 | 2020-07-15 | Low-power-consumption self-adaptive variable-gain hearing aid |
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| Publication Number | Publication Date |
|---|---|
| CN212324363U true CN212324363U (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021390442.9U Active CN212324363U (en) | 2020-07-15 | 2020-07-15 | Low-power-consumption self-adaptive variable-gain hearing aid |
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| Country | Link |
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| CN (1) | CN212324363U (en) |
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2020
- 2020-07-15 CN CN202021390442.9U patent/CN212324363U/en active Active
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