CN107257517B - Earphone integrating DAC and effect processing circuit - Google Patents
Earphone integrating DAC and effect processing circuit Download PDFInfo
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- CN107257517B CN107257517B CN201710693386.2A CN201710693386A CN107257517B CN 107257517 B CN107257517 B CN 107257517B CN 201710693386 A CN201710693386 A CN 201710693386A CN 107257517 B CN107257517 B CN 107257517B
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- operational amplifier
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
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Abstract
The invention discloses an earphone integrating a DAC and an effect processing circuit, which comprises an interface part and a control part, wherein the interface part is connected with the control part; the interface part comprises a data line and a MICROUSB male plug or TYPE-C plug connected with the outer end of the data line; the control part comprises a decoding sound effect processing circuit and a sound reduction device, and the sound reduction device is connected with an earphone loudspeaker or an AUX input end; the decoding sound effect processing circuit comprises a decoding output circuit and a sound effect processing circuit. The invention has reasonable design, and the product does not need to be provided with a lithium battery or charged, thereby saving the design cost and being green and environment-friendly. The production equipment is convenient, can improve production efficiency greatly, reduces the production defective rate, practices thrift manufacturing cost, and the practicality is strong, is suitable for the popularization.
Description
Technical Field
The invention belongs to the field of electronic products, and particularly relates to an earphone integrating a DAC (digital-to-analog converter) and an effect processing circuit.
Background
In 2016, with the global sale of iphone7, the apple smartphone has a function change, which has to attract our attention, and apple company has taken the lead to cancel the 3.5 earphone socket in order to enhance the waterproof function. With this trend, other brands of smart phones may also follow this concept to change the design.
3.5 after the earphone hole is cancelled, the daily use habit of people is changed. Some people may choose bluetooth headsets, but it is well known that bluetooth headsets are high-frequency wireless audio receiving products, worn on ears and relatively close to the head of a human body, and have an influence on the health of the human body due to the high radiation of electromagnetic waves.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the earphone integrating the DAC and the audio processing circuit, the design is reasonable, a lithium battery is not required to be arranged in the earphone, the earphone is not required to be charged, the design cost is saved, and the earphone is green and environment-friendly. The production equipment is convenient, can improve production efficiency greatly, reduces the production defective rate, practices thrift manufacturing cost, and the practicality is strong, is suitable for the popularization.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an integrated DAC and audio amplifier of effect processing circuit which characterized in that: comprises an interface part and a control part; the interface part comprises a data line and a MICROUSB male plug or TYPE-C plug connected with the outer end of the data line; the control part comprises a decoding sound effect processing circuit and a sound reduction device, and the sound reduction device is connected with an earphone loudspeaker or an AUX input end; the decoding sound effect processing circuit comprises a decoding output circuit and a sound effect processing circuit.
As an optimized technical scheme, the decoding output circuit comprises a DAC chip, power is taken from a USB female seat, 5V voltage enters PIN10 of U1 after being filtered by C6 and C33, and power is supplied to the DAC chip; digital audio signals output by the USB female socket are transmitted to a CN5 bus bar end through a MICROUSB male connector and are connected to a DAC chip through R4, D + and R9 and D-; PIN7 on the DAC chip is a PIN with 3.3V voltage output for the internal voltage stabilization of the chip, and C12 is a filter capacitor of PIN 7; r28 is a pull-up resistor connected to D +; r30 is a pull-up resistor connected to PIN 3; the R12 and the D6 are connected with an external power indicator light; t1, C114, C115 and R8 form a crystal oscillation loop of the IC; c1, C16, C17 and C25 filter the power supply terminals of the branches of U1, and R3, S1, S2 and S3 are the loop parts of the volume adjusting circuit of the chip, and audio analog signals decoded by the chip are output to the input end of the sound effect processing circuit through PIN14 and PIN 15.
As an optimized technical scheme, the sound effect processing circuit comprises a left sound channel processing circuit and a right sound channel processing circuit; the left channel processing circuit, the DAC chip decodes the output left channel audio signal, the audio signal is coupled to a low pass filter composed of R18 and C20 through C14 and R6, the filtered audio signal is input to the non-inverting input end of the operational amplifier U7-A, then the signal is amplified through the operational amplifier, and the amplifying part circuit comprises R7, C10, R19 and R10; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U7-B through R5, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit, the high-pass filter circuit comprises C18, C29 and R2, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the left channel loudspeaker of the earphone; l2, C34, C11 and C15 form power supply filtering of an operational amplifier U7, and R14, R16, R17 and C13 form voltage bias and filtering of a non-inverting input end of an operational amplifier U1; the right channel processing circuit is characterized in that a right channel audio signal decoded and output by a DAC chip is coupled to a low-pass filter consisting of R24 and C27 through C22 and R21, the filtered audio signal is input to a non-inverting input end of an operational amplifier U2-A, and then is amplified through an operational amplifier signal, and the amplifying part circuit comprises R22, C23, R25 and R23; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U2-B through R11, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit comprising C8, C30 and R1, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the right channel loudspeaker of the earphone; l2, C34, C9 and C24 form power supply filtering of an operational amplifier U2, and R14, R16, C13 and R20 form voltage bias and filtering of a non-inverting input end of an operational amplifier U2.
Due to the adoption of the technical scheme, compared with the prior art, the digital audio earphone is reasonable in design, is a complete digital audio earphone, does not need to be provided with a lithium battery or be charged, saves the design cost, is green and environment-friendly, is convenient to produce and assemble, can greatly improve the production efficiency, reduces the reject ratio of production, saves the production cost, has strong practicability, and is suitable for popularization.
The invention is further illustrated with reference to the figures and examples.
Drawings
FIG. 1 is a schematic circuit diagram of a decoding output circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a sound processing circuit according to an embodiment of the present invention.
Detailed Description
Examples
An earphone integrating a DAC and an effect processing circuit comprises an interface part and a control part. The interface part comprises a data line and a MICROUSB or TYPE-C male connector connected to the outer end of the data line. The control part comprises a decoding sound effect processing circuit and a sound reduction device, and the sound reduction device is connected to an earphone loudspeaker or an AUX input end. The decoding sound effect processing circuit comprises a decoding output circuit and a sound effect processing circuit.
The decoding output circuit comprises a DAC chip circuit, and the DAC chip circuit is connected with an interface circuit, a volume adjusting circuit and a sound effect adjusting circuit.
According to the actual situation after production, besides the structure of the principle part, the earphone and the audio amplifier have additional structures to ensure the normal work of the earphone and the audio amplifier. The structure thereof substantially comprises: 1. micro USB or (TYPE-C) plug wire; 2. the earphone wire control part comprises a) a PCBA, b) a plastic upper shell, c) a plastic lower shell, d) a button and e) a microphone; 3. an earplug portion.
As shown in fig. 1, the decoding output circuit comprises a DAC chip, the power is taken from a USB female socket, 5V voltage enters a PIN10 of U1 after being filtered by C6 and C33, and the power is supplied to the DAC chip; digital audio signals output by the USB female socket are transmitted to a CN5 bus bar end through a MICROUSB male connector and are connected to a DAC chip through R4, D + and R9 and D-; PIN7 on the DAC chip is a PIN with 3.3V voltage output for the internal voltage stabilization of the chip, and C12 is a filter capacitor of PIN 7; r28 is a pull-up resistor connected to D +; r30 is a pull-up resistor connected to PIN 3; the R12 and the D6 are connected with an external power indicator light; t1, C114, C115 and R8 form a crystal oscillation loop of the IC; c1, C16, C17 and C25 filter the power supply terminals of the branches of U1, and R3, S1, S2 and S3 are the loop parts of the volume adjusting circuit of the chip, and audio analog signals decoded by the chip are output to the input end of the sound effect processing circuit through PIN14 and PIN 15.
As shown in FIG. 2, the sound effect processing circuit includes a left channel processing circuit and a right channel processing circuit. The left channel audio signal decoded and output by the DAC chip is coupled to a low-pass filter consisting of R18 and C20 through C14 and R6, the filtered audio signal is input to a non-inverting input end of an operational amplifier U7-A, and then is amplified through the signal of the operational amplifier, and an amplifying part circuit comprises R7, C10, R19 and R10; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U7-B through R5, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit, the high-pass filter circuit comprises C18, C29 and R2, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the left channel loudspeaker of the earphone; l2, C34, C11 and C15 form power supply filtering of an operational amplifier U7, and R14, R16, R17 and C13 form voltage bias and filtering of a non-inverting input end of an operational amplifier U1; the right channel processing circuit is characterized in that a right channel audio signal decoded and output by a DAC chip is coupled to a low-pass filter consisting of R24 and C27 through C22 and R21, the filtered audio signal is input to a non-inverting input end of an operational amplifier U2-A, and then is amplified through an operational amplifier signal, and the amplifying part circuit comprises R22, C23, R25 and R23; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U2-B through R11, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit comprising C8, C30 and R1, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the right channel loudspeaker of the earphone; l2, C34, C9 and C24 form power supply filtering of an operational amplifier U2, and R14, R16, C13 and R20 form voltage bias and filtering of a non-inverting input end of an operational amplifier U2.
The digital audio earphone or audio amplifier is reasonable in design, does not need to be provided with a lithium battery or charged, saves the design cost, is green and environment-friendly, is convenient to produce and assemble, can greatly improve the production efficiency, reduces the reject ratio of production, saves the production cost, has strong practicability, and is suitable for popularization.
The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (1)
1. The utility model provides an integrated DAC and effect processing circuit's earphone which characterized in that: comprises an interface part and a control part;
the interface part comprises a data line and a MICROUSB male plug or TYPE-C plug connected with the outer end of the data line;
the control part comprises a decoding sound effect processing circuit and a sound reduction device, and the sound reduction device is connected with an earphone loudspeaker or an AUX input end;
the decoding sound effect processing circuit comprises a decoding output circuit and a sound effect processing circuit;
the decoding output circuit comprises a DAC chip, the power is obtained from a USB female seat, 5V voltage enters PIN10 of U1 after being filtered by C6 and C33, and power is supplied to the DAC chip; digital audio signals output by the USB female socket are transmitted to a CN5 bus bar end through a MICROUSB male connector, and the digital audio signals are connected to a DAC chip through R4, D + and R9, D-; PIN7 on the DAC chip is a PIN with 3.3V voltage output for the internal voltage stabilization of the chip, and C12 is a filter capacitor of PIN 7; r28 is a pull-up resistor connected to D +; r30 is a pull-up resistor connected to PIN 3; the R12 and the D6 are connected with an external power indicator light; t1, C114, C115 and R8 form a crystal oscillation loop of the IC; c1, C16, C17 and C25 filter the power supply terminals of the branches of U1, R3, S1, S2 and S3 are the loop parts of the volume adjusting circuit of the chip, and the audio analog signals decoded by the chip are output to the input end of the sound effect processing circuit through PIN14 and PIN 15;
the sound effect processing circuit comprises a left sound channel processing circuit and a right sound channel processing circuit; the left channel processing circuit, the DAC chip decodes the output left channel audio signal, the audio signal is coupled to a low pass filter composed of R18 and C20 through C14 and R6, the filtered audio signal is input to the non-inverting input end of the operational amplifier U7-A, then the signal is amplified through the operational amplifier, and the amplifying part circuit comprises R7, C10, R19 and R10; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U7-B through R5, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit, the high-pass filter circuit comprises C18, C29 and R2, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the left channel loudspeaker of the earphone; l2, C34, C11 and C15 form power supply filtering of an operational amplifier U7, and R14, R16, R17 and C13 form voltage bias and filtering of a non-inverting input end of an operational amplifier U1; the right channel processing circuit is characterized in that a right channel audio signal decoded and output by a DAC chip is coupled to a low-pass filter consisting of R24 and C27 through C22 and R21, the filtered audio signal is input to a non-inverting input end of an operational amplifier U2-A, and then is amplified through an operational amplifier signal, and the amplifying part circuit comprises R22, C23, R25 and R23; the audio signal is amplified by an amplifying circuit and then transmitted to a voltage follower circuit consisting of an operational amplifier U2-B through R11, the audio signal is processed by the voltage follower and then transmitted to a high-pass filter circuit comprising C8, C30 and R1, and after the audio signal is processed by the high-pass circuit, the high-quality audio signal is transmitted to the right channel loudspeaker of the earphone; l2, C34, C9 and C24 form power supply filtering of an operational amplifier U2, and R14, R16, C13 and R20 form voltage bias and filtering of a non-inverting input end of an operational amplifier U2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693386.2A CN107257517B (en) | 2017-08-14 | 2017-08-14 | Earphone integrating DAC and effect processing circuit |
| PCT/CN2017/101940 WO2019033490A1 (en) | 2017-08-14 | 2017-09-15 | Earphone and audio amplifier integrated with dac and sound effect processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693386.2A CN107257517B (en) | 2017-08-14 | 2017-08-14 | Earphone integrating DAC and effect processing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107257517A CN107257517A (en) | 2017-10-17 |
| CN107257517B true CN107257517B (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710693386.2A Active CN107257517B (en) | 2017-08-14 | 2017-08-14 | Earphone integrating DAC and effect processing circuit |
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| Country | Link |
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| CN (1) | CN107257517B (en) |
| WO (1) | WO2019033490A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10433062B2 (en) * | 2018-01-12 | 2019-10-01 | Diodes Incorporated | Stereo audio system and method |
| CN108616786A (en) * | 2018-04-28 | 2018-10-02 | 钰太芯微电子科技（上海）有限公司 | A kind of line control earphone of adaptive guard ear |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1536663A1 (en) * | 2003-11-28 | 2005-06-01 | Freescale Semiconductor, Inc. | Headset interface circuit |
| CN201191512Y (en) * | 2008-05-08 | 2009-02-04 | 上海米廷电子科技有限公司 | Resonance audio player adopting USB interface |
| CN103067822B (en) * | 2012-12-17 | 2015-03-04 | 青岛海信宽带多媒体技术有限公司 | High-fidelity (Hi-Fi) audio adapter |
| CN203435136U (en) * | 2013-09-16 | 2014-02-12 | 深圳市晶科源科技有限公司 | Audio frequency amplifier integrated with USB power supply interface |
| CN206075818U (en) * | 2016-07-14 | 2017-04-05 | 饶有良 | The music player of replaceable audio decoder and Earphone Amplifier component |
-
2017
- 2017-08-14 CN CN201710693386.2A patent/CN107257517B/en active Active
- 2017-09-15 WO PCT/CN2017/101940 patent/WO2019033490A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN107257517A (en) | 2017-10-17 |
| WO2019033490A1 (en) | 2019-02-21 |
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