CN217546295U - Hearing aid circuit with digital volume control function - Google Patents
Hearing aid circuit with digital volume control function Download PDFInfo
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- CN217546295U CN217546295U CN202220928393.2U CN202220928393U CN217546295U CN 217546295 U CN217546295 U CN 217546295U CN 202220928393 U CN202220928393 U CN 202220928393U CN 217546295 U CN217546295 U CN 217546295U
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- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims abstract description 41
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- 230000005611 electricity Effects 0.000 claims abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 21
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000003247 decreasing effect Effects 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 description 6
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 208000032041 Hearing impaired Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010370 hearing loss Effects 0.000 description 1
- 231100000888 hearing loss Toxicity 0.000 description 1
- 208000016354 hearing loss disease Diseases 0.000 description 1
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Abstract
The utility model discloses a audiphone circuit with digital volume control function relates to the audiphone field, including audio frequency processing module, voltage stabilizing module, the lithium cell, the management module that charges, volume control module, microphone and loudspeaker, audio frequency processing module respectively with the microphone, loudspeaker, voltage stabilizing module electricity is connected, voltage stabilizing module is connected with the lithium cell electricity, the lithium cell electricity is connected with the management module that charges, audio frequency processing module's control foot is connected with volume control module electricity, audio frequency processing module includes audio frequency processing chip U1 and peripheral circuit, volume control module includes microprocessor U2, resistance R7, resistance R10, resistance R16 and touch-sensitive circuit. The automatic starting device has the advantages that a manual physical switch is omitted, automatic starting is achieved through the Hall detection switch, functional operation is achieved through the touch sensing technology, accurate control over volume gain is achieved, operation stepping gain is increased or decreased evenly, operation experience and product service life are improved, and user experience is enhanced.
Description
Technical Field
The utility model relates to a audiphone field especially relates to a audiphone circuit with digital volume control function.
Background
Hearing aids are devices for amplifying sound, which function to increase the intensity of sound energy and transmit it into the ear as undistorted as possible, convert it into electrical signals, and convert it into sound energy after amplification by a circuit. With such a hearing aid, the hearing loss of a hearing impaired person can be compensated to varying degrees.
Hearing aids are generally classified into four types according to their external structures: behind The Ear (BTE), in The Ear (ITE), in The Canal (ITC), and deep in the canal (CIC). The in-the-ear hearing aid is larger than the auditory canal hearing aid in size correspondingly, and is smaller than the back of the ear hearing aid in size, and the structural design is relatively flexible, so that the noise reduction effect and the like can be better considered in the circuit design for use and experience.
When the existing in-ear hearing aid is taken out of a charging box, a switch needs to be manually pulled or pressed to realize the on-off function. Because the volume of the hearing aid product is relatively small, and the structure of the toggle switch or the tact switch is small, the operation is inconvenient. The conventional hearing aid in the ear traditionally uses a manual potentiometer to control the volume or utilizes the grounding function of a Microprocessor (MCU) I/O to control grounding resistors with different resistances in an audio signal channel to change the signal level of the input end of a power amplification stage so as to change the gain, thereby achieving the purpose of changing the volume. The position of the potentiometer cannot be fixed precisely at a certain parameter value. The method of changing the grounding resistance of the I/O port of the Microprocessor (MCU) to change the gain is not a digital signal, has uneven stepping, has loss to the signal and has larger distortion. Neither of these two control methods can control the volume accurately and uniformly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a audiphone circuit with digital volume control function to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a hearing aid circuit with a digital volume control function comprises an audio processing module, a voltage stabilizing module, a lithium battery, a charging management module, a volume control module, a microphone and a loudspeaker, wherein the input of the audio processing module is electrically connected with the microphone, the output of the audio processing module is electrically connected with the loudspeaker, the power input pin of the audio processing module is electrically connected with the voltage stabilizing module, the voltage stabilizing module is electrically connected with the lithium battery, the lithium battery is electrically connected with the charging management module, and the control pin of the audio processing module is electrically connected with the volume control module;
the audio processing module comprises an audio processing chip U1 and a peripheral circuit thereof;
the voltage stabilizing module comprises an LDO voltage stabilizing chip and a Hall switch detection circuit, wherein an enabling end EN and a power input end VIN of the LDO voltage stabilizing chip are electrically connected with the Hall switch detection circuit;
the volume control module comprises a microprocessor U2, a resistor R7, a resistor R10, a resistor R16 and a touch sensing circuit, the microprocessor U2 is provided with a reset input port, an I2C communication interface A, I C communication interface B and an I2C communication interface C, the I2C communication interface C of the microprocessor U2 is electrically connected with the touch sensing circuit, the I2C communication interface A of the microprocessor U2 is respectively electrically connected with a CLOCK pin and a resistor R7 of an audio processing chip U1, the I2C communication interface B of the microprocessor U2 is respectively electrically connected with a UP/DN pin and a resistor R10 of the audio processing chip U1, the reset input port of the microprocessor U2 is connected with the resistor R16 in series, and the resistor R16 is respectively electrically connected with the resistor R7 and the resistor R10.
The Hall detection switch is utilized, when the machine is taken out from the charging bin, the machine leaves a magnetic induction range to realize automatic startup, the operation experience is improved, the service life of a product is prolonged, and a manual switch for startup and shutdown is cancelled; the microprocessor U2 is matched with the volume control circuit and the touch sensing circuit, and the touch sensing technology and the software algorithm are utilized to realize functional operation, so that the operation experience is improved, the service life of a product is prolonged, and the manual potentiometer is omitted; the audio processing chip U1 is matched with the microprocessor U2 to realize the accurate control of the volume gain, so that the operation stepping gain is uniformly increased or reduced, and the user experience is enhanced.
Further, the touch sensing circuit includes a touch detection chip U3, a touch sensing switch, a resistor R17, a capacitor C17 and a capacitor C25, the resistor R17 is electrically connected between an input pin of the touch detection chip U3 and the touch sensing switch, an output pin of the touch detection chip U3 is electrically connected with an I2C communication interface C of the microprocessor U2, the capacitor C17 is electrically connected between an output of the touch sensing switch and a GND pin of the touch detection chip U3, an AHLB pin of the touch detection chip U3 is electrically connected with the GND pin (output high level is valid), and the capacitor C25 is electrically connected between a VDD pin of the touch detection chip U3 and the TOG pin. By using the digital volume control technology, a physical potentiometer or a volume control mode is controlled by using an I2C signal. The step of the volume is accurately controlled in the audio processing chip U1 (the volume is correspondingly increased or decreased by 6dB when the volume is increased or decreased by one level), so that the manual physical switch is cancelled when the audio signal is accurately controlled. The physical potentiometer is changed into a touch inductive switch, the function operation of the hearing aid is controlled through the touch inductive switch, and the operation experience and the product life are improved.
Further, hall switch detection circuitry includes hall sensor, normally closed relay, resistance R20 and resistance R21, the power input VIN and the resistance R20 electricity of LDO steady voltage chip are connected, the enable terminal EN and the resistance R21 electricity of LDO steady voltage chip are connected, the first end of normally closed relay is connected with hall sensor's power input VDD, resistance R20 electricity respectively, the third end of normally closed relay is connected with hall sensor's output OUT, resistance R21 electricity respectively, the second end of normally closed relay is connected with hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively, the fourth end of normally closed relay is connected with hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively. Utilize hall detection switch, leave the magnetic force induction scope and realize automatic start-up when taking out the machine from the storehouse that charges, cancel manual physics switch, improve operation experience and product life.
Further, the hall switch detection circuit further comprises a capacitor C24, and the capacitor C24 is electrically connected between the power input end VDD and the normally closed end NC of the hall sensor. By configuring the capacitor C24, the voltages of the power input end VDD and the normally-closed end NC of the Hall sensor are kept stable, and the Hall sensor is prevented from being interfered.
Further, the voltage stabilizing module further comprises a capacitor C19, and the capacitor C19 is electrically connected between the ground terminal GND of the LDO voltage stabilizing chip and the output terminal VOUT. By configuring the capacitor C24, the voltages of the ground terminal GND and the output terminal VOUT of the LDO voltage stabilization chip are kept stable, and interference is avoided.
Further, the audio processing chip U1 is an audio power amplifier LM4811. The audio power amplifier LM4811 is a digital volume control chip, and a special digital volume control chip is used for accurately controlling the volume gain, so that the operation stepping gain is uniformly increased or reduced, and the user experience is enhanced.
Further, the microprocessor U2 is a QFN20 microcontroller. Volume is controlled using a QFN20 package type microcontroller.
Further, the touch detection chip U3 is a touch detection chip VKD233DR. The VKD233DR is used as a key touch detection chip, a manual physical switch is omitted, functional operation is achieved by using a touch sensing technology and a software algorithm, operation experience is improved, and the service life of a product is prolonged.
Further, the resistor R20 is 10K ohms, and the resistor R21 is 100K ohms.
The utility model has the advantages that: the automatic starting device has the advantages that a manual physical switch is omitted, automatic starting is achieved through the Hall detection switch, functional operation is achieved through the touch sensing technology, accurate control over volume gain is achieved, operation stepping gain is increased or decreased evenly, operation experience and product service life are improved, and user experience is enhanced.
Drawings
The figures further illustrate the invention, but the embodiments in the figures do not constitute any limitation of the invention.
Fig. 1 is a schematic diagram of an audio processing module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a volume control module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage stabilizing module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a charging management module according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an internal volume control circuit of the audio processing chip U1 according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
In the present invention, unless otherwise specified, the terms of orientation such as "up, down, left, and right" used generally refer to up, down, left, and right as shown in fig. 1. "inner and outer" refer to the inner and outer portions of a particular contour. "distal and proximal" refer to distal and proximal relative to a component.
As shown in fig. 1-5, an embodiment of the present invention provides a hearing aid circuit with digital volume control function, which includes an audio processing module, a voltage stabilizing module, a lithium battery, a charging management module, a volume control module, a microphone, and a speaker, wherein an input of the audio processing module is electrically connected to the microphone, an output of the audio processing module is electrically connected to the speaker, a power input pin of the audio processing module is electrically connected to the voltage stabilizing module, the voltage stabilizing module is electrically connected to the lithium battery, the lithium battery is electrically connected to the charging management module, and a control pin of the audio processing module is electrically connected to the volume control module;
the audio processing module comprises an audio processing chip U1 and a peripheral circuit thereof;
the voltage stabilizing module comprises an LDO voltage stabilizing chip and a Hall switch detection circuit, wherein an enabling end EN and a power input end VIN of the LDO voltage stabilizing chip are electrically connected with the Hall switch detection circuit, and the Hall switch detection circuit automatically controls the on-off of the voltage stabilizing module;
the volume control module comprises a microprocessor U2, a resistor R7, a resistor R10, a resistor R16 and a touch sensing circuit, and the volume is controlled by an I2C signal. The microprocessor U2 is provided with a reset input port, an I2C communication interface A, I C communication interface B and an I2C communication interface C, the I2C communication interface C of the microprocessor U2 is electrically connected with the touch sensing circuit, the I2C communication interface A of the microprocessor U2 is respectively electrically connected with a CLOCK pin and a resistor R7 of the audio processing chip U1, the I2C communication interface B of the microprocessor U2 is respectively electrically connected with a UP/DN pin and a resistor R10 of the audio processing chip U1, the reset input port of the microprocessor U2 is connected with a resistor R16 in series, and the resistor R16 is respectively electrically connected with the resistor R7 and the resistor R10.
The Hall detection switch is utilized, when the machine is taken out from the charging bin, the machine leaves a magnetic induction range to realize automatic startup, the operation experience is improved, the service life of a product is prolonged, and a manual switch for startup and shutdown is cancelled; the microprocessor U2 is matched with the volume control circuit and the touch sensing circuit, and the touch sensing technology and the software algorithm are utilized to realize functional operation, so that the operation experience is improved, the service life of a product is prolonged, and the manual potentiometer is omitted; the audio processing chip U1 is matched with the microprocessor U2 to realize accurate control of volume gain, so that the operation stepping gain is uniformly increased or reduced, and the user experience is enhanced.
The touch sensing circuit comprises a touch detection chip U3, a touch sensing switch, a resistor R17, a capacitor C17 and a capacitor C25, wherein the resistor R17 is electrically connected between an input pin of the touch detection chip U3 and the touch sensing switch, an output pin of the touch detection chip U3 is electrically connected with an I2C communication interface C of the microprocessor U2, the capacitor C17 is electrically connected between the output of the touch sensing switch and a GND pin of the touch detection chip U3, an AHLB pin of the touch detection chip U3 is electrically connected with the GND pin (the output high level is effective), and the capacitor C25 is electrically connected between a VDD pin of the touch detection chip U3 and the TOG pin. By using the digital volume control technology, a physical potentiometer or a volume control mode is controlled by using an I2C signal. The step of the volume is accurately controlled in the audio processing chip U1 (the volume is correspondingly increased or decreased by 6dB when the volume is increased or decreased by one level), so that the manual physical switch is cancelled when the audio signal is accurately controlled. The physical potentiometer is changed into a touch inductive switch, the function operation of the hearing aid is controlled through the touch inductive switch, and the operation experience and the product life are improved.
Hall switch detection circuitry includes Hall sensor, normally closed relay, resistance R20 and resistance R21, the power input end VIN and the resistance R20 electricity of LDO steady voltage chip are connected, the enable terminal EN and the resistance R21 electricity of LDO steady voltage chip are connected, normally closed relay's first end is connected with Hall sensor's power input end VDD, resistance R20 electricity respectively, normally closed relay's third end is connected with Hall sensor's output OUT, resistance R21 electricity respectively, normally closed relay's second end is connected with Hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively, normally closed relay's fourth end is connected with Hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively. Utilize hall detection switch, leave the magnetic force induction scope and realize automatic start-up when taking out the machine from the storehouse that charges, cancel manual physics switch, improve operation experience and product life.
The Hall switch detection circuit further comprises a capacitor C24, and the capacitor C24 is electrically connected between the power input end VDD and the normally closed end NC of the Hall sensor. By configuring the capacitor C24, the voltages of the power input end VDD and the normally-closed end NC of the Hall sensor are kept stable, and the Hall sensor is prevented from being interfered.
The voltage stabilizing module further comprises a capacitor C19, and the capacitor C19 is electrically connected between the ground end GND and the output end VOUT of the LDO voltage stabilizing chip. By configuring the capacitor C24, the voltages of the ground terminal GND and the output terminal VOUT of the LDO voltage stabilization chip are kept stable, and interference is avoided.
The audio processing chip U1 is an audio power amplifier LM4811. The audio power amplifier LM4811 is a digital volume control chip, and a special digital volume control chip is used for accurately controlling the volume gain, so that the operation stepping gain is uniformly increased or reduced, and the user experience is enhanced.
The microprocessor U2 is a QFN20 microcontroller. The volume is controlled using a QFN20 package type microcontroller.
The touch detection chip U3 is a touch detection chip VKD233DR. The VKD233DR is used as a key touch detection chip, a manual physical switch is omitted, functional operation is achieved by using a touch sensing technology and a software algorithm, operation experience is improved, and the service life of a product is prolonged.
The resistor R20 is 10K ohms and the resistor R21 is 100K ohms.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A hearing aid circuit with digital volume control, characterized by: the voice-frequency control system comprises an audio processing module, a voltage stabilizing module, a lithium battery, a charging management module, a volume control module, a microphone and a loudspeaker, wherein the input of the audio processing module is electrically connected with the microphone, the output of the audio processing module is electrically connected with the loudspeaker, a power input pin of the audio processing module is electrically connected with the voltage stabilizing module, the voltage stabilizing module is electrically connected with the lithium battery, the lithium battery is electrically connected with the charging management module, and a control pin of the audio processing module is electrically connected with the volume control module;
the audio processing module comprises an audio processing chip U1 and a peripheral circuit thereof;
the voltage stabilizing module comprises an LDO voltage stabilizing chip and a Hall switch detection circuit, wherein an enabling end EN and a power input end VIN of the LDO voltage stabilizing chip are electrically connected with the Hall switch detection circuit;
the volume control module comprises a microprocessor U2, a resistor R7, a resistor R10, a resistor R16 and a touch sensing circuit, wherein the microprocessor U2 is provided with a reset input port, an I2C communication interface A, I C communication interface B and an I2C communication interface C, the I2C communication interface C of the microprocessor U2 is electrically connected with the touch sensing circuit, the I2C communication interface A of the microprocessor U2 is respectively electrically connected with a CLOCK pin and a resistor R7 of an audio processing chip U1, the I2C communication interface B of the microprocessor U2 is respectively electrically connected with an UP/DN pin and a resistor R10 of the audio processing chip U1, the reset input port of the microprocessor U2 is connected with the resistor R16 in series, and the resistor R16 is respectively electrically connected with the resistor R7 and the resistor R10.
2. A hearing aid circuit with digital volume control according to claim 1, characterized in that: the touch sensing circuit comprises a touch detection chip U3, a touch sensing switch, a resistor R17, a capacitor C17 and a capacitor C25, wherein the resistor R17 is electrically connected between an input pin of the touch detection chip U3 and the touch sensing switch, an output pin of the touch detection chip U3 is electrically connected with an I2C communication interface C of the microprocessor U2, the capacitor C17 is electrically connected between the output of the touch sensing switch and a GND pin of the touch detection chip U3, an AHLB pin of the touch detection chip U3 is electrically connected with a GND pin, and the capacitor C25 is electrically connected between a VDD pin of the touch detection chip U3 and the TOG pin.
3. A hearing aid circuit with digital volume control according to claim 1, characterized in that: hall switch detection circuitry includes Hall sensor, normally closed relay, resistance R20 and resistance R21, the power input end VIN and the resistance R20 electricity of LDO steady voltage chip are connected, the enable terminal EN and the resistance R21 electricity of LDO steady voltage chip are connected, normally closed relay's first end is connected with Hall sensor's power input end VDD, resistance R20 electricity respectively, normally closed relay's third end is connected with Hall sensor's output OUT, resistance R21 electricity respectively, normally closed relay's second end is connected with Hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively, normally closed relay's fourth end is connected with Hall sensor's normally closed end NC, hall sensor's earthing terminal GND electricity respectively.
4. A hearing aid circuit with digital volume control according to claim 3, characterized in that: the Hall switch detection circuit further comprises a capacitor C24, and the capacitor C24 is electrically connected between the power input end VDD and the normally closed end NC of the Hall sensor.
5. A hearing aid circuit with digital volume control according to claim 1, characterized in that: the voltage stabilizing module further comprises a capacitor C19, and the capacitor C19 is electrically connected between the ground end GND and the output end VOUT of the LDO voltage stabilizing chip.
6. A hearing aid circuit with digital volume control according to claim 1, characterized in that: the audio processing chip U1 is an audio power amplifier LM4811.
7. A hearing aid circuit with digital volume control according to claim 1, characterized in that: the microprocessor U2 is a QFN20 microcontroller.
8. A hearing aid circuit with digital volume control according to claim 2, characterized in that: the touch detection chip U3 is a touch detection chip VKD233DR.
9. A hearing aid circuit with digital volume control according to claim 1, characterized in that: the resistor R20 is 10K ohms, and the resistor R21 is 100K ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220928393.2U CN217546295U (en) | 2022-04-21 | 2022-04-21 | Hearing aid circuit with digital volume control function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220928393.2U CN217546295U (en) | 2022-04-21 | 2022-04-21 | Hearing aid circuit with digital volume control function |
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| Publication Number | Publication Date |
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| CN217546295U true CN217546295U (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220928393.2U Active CN217546295U (en) | 2022-04-21 | 2022-04-21 | Hearing aid circuit with digital volume control function |
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| CN (1) | CN217546295U (en) |
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- 2022-04-21 CN CN202220928393.2U patent/CN217546295U/en active Active
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