CN113242484A - Audio chip and earphone that tone quality optimization handled - Google Patents
Audio chip and earphone that tone quality optimization handledDownload PDFInfo
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- CN113242484A CN113242484ACN202110480467.0ACN202110480467ACN113242484ACN 113242484 ACN113242484 ACN 113242484ACN 202110480467 ACN202110480467 ACN 202110480467ACN 113242484 ACN113242484 ACN 113242484A
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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
- H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
- 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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Abstract
Description
Technical Field
The invention relates to the field of audio output equipment, in particular to an audio chip and an earphone with optimized tone quality.
Background
For the existing earphone, when the connector of the earphone is inserted into the audio jack, on one hand, noise in the audio jack is not processed because the voltage output end of the audio jack is subjected to voltage stabilization processing, and the operation of an internal device of an audio signal output terminal connected with the earphone also generates interference noise, and the two parts of noise are output to the earphone through the voltage output end of the audio jack; on the other hand, the impedance of the grounding end point of the audio jack itself, or the impedance of the grounding end point inside the sound effect processing chip, or the impedance of the audio jack connected to the wiring of the sound effect processing chip makes the left and right channels of the earphone play audio signals, the right ear can hear the sound of the left channel, the left ear can also hear the sound of the right channel, and if the microphone is receiving sound at this time, the microphone can also record the sound of the left and right channels at the same time. Above-mentioned noise interference can influence the earphone audio to a certain extent, especially bass audio, and then influence user's sense of hearing and experience.
Disclosure of Invention
In view of the above-mentioned disadvantages in the prior art, the present invention provides an audio chip for sound quality optimization, including: the audio processing circuit is used for receiving the audio signal transmitted by the audio signal output terminal and generating a left channel signal and a right channel signal; the first gain and phase adjuster is connected with the audio processing circuit and is used for adjusting the gain and the phase of the right channel signal to generate a first adjusting signal; a first adder, connected to the first gain and phase adjuster and the audio processing circuit, for adding the left channel signal and the first adjustment signal to generate an adjusted left channel signal; the second gain and phase adjuster is connected with the audio processing circuit and is used for adjusting the gain and the phase of the left channel signal to generate a second adjusting signal; a second adder, connected to the second gain and phase adjuster and the audio processing circuit, for adding the right channel signal and the second adjustment signal to generate an adjusted right channel signal; and obtaining a left ear audio signal output to the left loudspeaker and a right ear audio signal output to the right loudspeaker based on the adjusted left channel signal and the adjusted right channel signal.
Preferably, the microphone also comprises a first analog-digital converter for receiving a sound signal from the microphone and converting the sound signal into a digital input signal;
a third gain and phase adjuster, connected to the audio processing circuit, for adjusting the gain and phase of the left channel signal and the right channel signal to generate a third adjustment signal; and a third adder, connected to the first adc, the third gain and phase adjuster, and the audio processing circuit, for adding the digital input signal and the third adjustment signal to generate an adjusted digital input signal, and sending the adjusted digital input signal to the audio processing circuit.
Preferably, the first gain and phase adjuster adjusts the amplitude of the right channel signal to be close to the amplitude of the left channel signal and in opposite phase to the previous.
Preferably, the second gain and phase adjuster adjusts the amplitude of the left channel signal to be close to the amplitude of the right channel signal and in opposite phase to the previous one.
Preferably, the third gain and phase adjuster adjusts the amplitudes of the left channel signal and the right channel signal to be close to the digital input signal and to be opposite in phase to the previous ones.
Preferably, the left filter circuit is connected to the first adder, the power reference voltage, and the audio processing circuit, and is configured to mix the bass signal output by the audio processing circuit with the adjusted left channel signal to generate a left-ear audio signal.
Preferably, the left filter circuit is connected to the second adder, the power reference voltage, and the audio processing circuit, and is configured to mix the bass signal output by the audio processing circuit with the adjusted left channel signal to generate a left-ear audio signal.
Preferably, the left filter circuit and/or the right filter circuit includes: the reverse input end of the amplifier is connected with the bass signal, and the forward input end of the amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the bass signal; the audio mixer is formed by connecting two output ends of a capacitor C1 and a resistor R1 which are connected in series and a capacitor C2 and a resistor R2 which are connected in series in parallel, wherein the output end of the amplifier is connected with the capacitor C1, a left channel signal or a right channel signal after adjustment is connected with the capacitor C2, and the output end of the audio mixer is connected with a left loudspeaker or a right loudspeaker.
Preferably, the left filter circuit and/or the right filter circuit includes: the reverse input end of the first amplifier is connected with the bass signal, and the forward input end of the first amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the bass signal; the reverse input end of the second amplifier is connected with the adjusted left channel signal or the adjusted right channel signal, and the forward input end of the second amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the adjusted left channel signal or the adjusted right channel signal; the audio mixer is formed by parallelly connecting the output of capacitor C1 and resistance R1 and capacitor C2 and resistance R2 two ways that concatenate in series, wherein capacitor C1 is connected to the output of first amplifier, capacitor C2 is connected to the output of first amplifier, and left speaker or right speaker are connected to the audio mixer output.
Preferably, the capacitance values of the capacitor C1 and the capacitor C2 are greater than or equal to 45 μ F.
Preferably, the power reference voltage is connected to a positive input terminal of the amplifier, the first amplifier or the second amplifier via a resistor R3, and the positive input terminal of the amplifier, the first amplifier or the second amplifier is further connected to ground via a capacitor C3.
Preferably, the resistor R3 is a variable resistor, and the capacitor C3 is a variable capacitor.
Preferably, the resistor R3 is a resistor with a fixed value, and the capacitor C3 is a capacitor with a fixed value, which can be selected according to different applications.
Preferably, the left filter circuit and/or the right filter circuit further include a second digital-to-analog converter connected to the output end of the mixer, and configured to perform digital-to-analog conversion on the left-ear audio signal or the right-ear audio signal obtained after mixing to correspondingly output the left-ear audio signal or the right-ear audio signal to the left speaker or the right speaker.
The invention also provides an earphone which is provided with any one of the audio chip with the sound quality optimization processing.
The invention provides an audio chip and an earphone for sound quality optimization processing; adjusting the gain and the phase of an audio signal which can be an interference source through a plurality of gain and phase adjusters to generate an adjusting signal; adding the required audio signal and the corresponding adjusting signal through a plurality of adders to generate an adjusted required audio signal; further filtering other interferences such as interference of power supply reference voltage and the like through a filter circuit based on the adjusted required audio signal to obtain an audio signal output to the loudspeaker; the conventional noise is removed, the sound effect of the earphone is guaranteed, and the hearing experience of a user is improved.
Drawings
Fig. 1 is a block diagram of an audio chip for sound quality optimization according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a left filter circuit or a right filter circuit according to an embodiment of the invention.
The voice quality optimization processing device comprises an audio chip-100, an audio processing circuit-1, a first analog-digital converter-2, a third adder-3, a second adder-4, a first adder-5, a third gain and phase adjuster-6, a second gain and phase adjuster-7, a first gain and phase adjuster-8, a left filter circuit-9, a right filter circuit-10, a left loudspeaker-11, a right loudspeaker-12, an amplifier-13, an audio mixer-14, resistors-R1, R2, R3, capacitors-C1, C2 and C3.
Detailed Description
In order to solve the noise problem of the existing earphone system, the audio chip and the earphone with optimized tone quality provided by the invention are realized by the following technical scheme:
example 1:
the present embodiment provides anaudio chip 100 for sound quality optimization processing, please refer to fig. 1, which includes: theaudio processing circuit 1 is used for receiving an audio signal SS transmitted by an audio signal output terminal and generating a left channel signal SL1 and a rightchannel signal SR 1; a first gain andphase adjuster 8 connected to theaudio processing circuit 1 for adjusting the gain and phase of the right channel signal SR1 to generate a first adjustment signal S3; afirst adder 5 connected to the first gain andphase adjuster 8 and the audio processing circuit for adding the left channel signal SL1 and the first adjustment signal S3 to generate an adjusted leftchannel signal SL 2; a second gain andphase adjuster 7 connected to theaudio processing circuit 1 for adjusting the gain and phase of the left channel signal SL1 to generate a second adjustment signal S2; asecond adder 4 connected to the second gain andphase adjuster 7 and theaudio processing circuit 1 for adding the right channel signal SR1 and the second adjustment signal S2 to generate an adjusted rightchannel signal SR 2; the left ear audio signal SL3 output to theleft speaker 11 and the right ear audio signal SR3 output to theright speaker 12 are obtained based on the adjusted left channel signal SL2 and the adjusted rightchannel signal SR 2.
Specifically, the digital audio system further comprises a first analog-to-digital converter 2 for receiving a sound signal SM from a microphone and converting the sound signal SM into a digital input signal D1;
a third gain andphase adjuster 6, connected to theaudio processing circuit 1, for adjusting the gain and phase of the left channel signal SL1 and the right channel signal SR1 to generate a third adjustment signal S1;
athird adder 3, connected to thefirst adc 2, the third gain andphase adjuster 6 and theaudio processing circuit 1, for adding the digital input signal D1 and the third adjustment signal S1 to generate an adjusted digital input signal D2 to theaudio processing circuit 1.
Specifically, the first gain andphase adjuster 8 adjusts the amplitude of the right channel signal SR2 to be close to the amplitude of the left channel signal SL1, and in opposite phase to before.
Specifically, the second gain andphase adjuster 7 adjusts the amplitude of the left channel signal SL1 to be close to the amplitude of the right channel signal SR1, and in reverse phase to the previous.
Specifically, the third gain andphase adjuster 6 adjusts the amplitudes of the left channel signal SL1 and the right channel signal SR1 to be close to the digital input signal D1, and in opposite phases from before.
Specifically, the audio processing circuit further includes aleft filter circuit 9, connected to thefirst adder 5, the power reference voltage Vcc, and theaudio processing circuit 1, and configured to mix the bass signal SD output by theaudio processing circuit 1 with the adjusted left channel signal SL2 to generate a left-earaudio signal SL 3.
Specifically, theright filter circuit 10 is connected to thesecond adder 4, the power reference voltage Vcc, and theaudio processing circuit 1, and is configured to mix the bass signal SD output by theaudio processing circuit 1 with the adjusted right channel signal SR2 to generate a right earaudio signal SR 3.
Specifically, referring to fig. 2, theleft filter circuit 9 and/or theright filter circuit 10 includes: theamplifier 13, its inverting input end connects the said bass signal SD, its positive input end connects the power reference voltage Vcc, in order to produce the large-amplitude gain function of the bass signal SD; theaudio mixer 14 is formed by connecting output ends of two paths of serially connected capacitors C1 and resistors R1 and serially connected capacitors C2 and resistors R2 in parallel, wherein the output end of theamplifier 13 is connected with the capacitor C1, the adjusted left channel signal SL2 or the adjusted right channel signal SR2 is connected with the capacitor C2, and the output end of theaudio mixer 14 is connected with theleft loudspeaker 11 or theright loudspeaker 12; the high-frequency filtering processing is performed on the amplified bass signal SD and the adjusted left channel signal SL2 or the adjusted right channel signal SR2 to further prevent the left and right channels from being affected with each other, and the amplified bass signal SD and the adjusted left channel signal SL2 or the adjusted right channel signal SR2 are output to theleft speaker 11 or theright speaker 12 after providing the gained sound mixing function.
The adjusted left channel signal SL2 or the adjusted right channel signal SR2 directly provides a large gain effect through the capacitor C2, the bass signal SD enhances the signal strength through the high-magnification gain of theamplifier 13, and is serially connected to the resistor R1 through the capacitor C1 to provide a large gain and eliminate noise generated by theamplifier 13, and is then serially connected to the resistor R2 with the adjusted left channel signal SL2 or the adjusted right channel signal SR2 to mix sound, and the resistor R1 and the resistor R2 contribute to the clarity and softness after mixing sound, and prevent the channel signals from affecting each other, and then output to theleft speaker 11 or theright speaker 12.
Specifically, theleft filter circuit 9 and/or theright filter circuit 10 includes: the reverse input end of the first amplifier is connected with the bass signal SD, and the positive input end of the first amplifier is connected with a power supply reference voltage Vcc for generating a large-amplitude gain function on the bass signal SD; the reverse input end of the second amplifier is connected with the adjusted left channel signal SL2 or the adjusted right channel signal SR2, and the positive input end of the second amplifier is connected with a power supply reference voltage Vcc, so that the adjusted left channel signal SL2 or the adjusted right channel signal SR2 can generate a large-amplitude gain function; theaudio mixer 14 is formed by connecting in parallel the output ends of two ways of capacitor C1 and resistance R1 and capacitor C2 and resistance R2 that concatenate, wherein capacitor C1 is connected to the output of first amplifier, capacitor C2 is connected to the output of first amplifier, andleft speaker 11 orright speaker 12 are connected to the 14 output of audio mixer.
Specifically, the capacitance values of the capacitor C1 and the capacitor C2 are greater than or equal to 45 μ F.
Specifically, the power supply reference voltage Vcc is connected to the positive input terminal of theamplifier 13, the first amplifier, or the second amplifier via a resistor R3, and the positive input terminal of theamplifier 13, the first amplifier, or the second amplifier is further grounded via a capacitor C3.
Specifically, the resistor R3 is a variable resistor, and the capacitor C3 is a variable capacitor.
The power reference voltage Vcc generates a voltage reduction effect through the variable resistor R3 to provide a working reference voltage required by theamplifier 13, the first amplifier or the second amplifier, and the variable capacitor C3 filters low-frequency noise generated by voltage instability of the power reference voltage Vcc, so that the audio frequency of theamplifier 13, the first amplifier or the second amplifier is clearer. The main purpose of using the variable resistor R3 and the variable capacitor C3 is that different amplifiers may have slight differences, and the most suitable operating voltage and filtering effect can be provided after the fine tuning of the variable resistor R3 and the variable capacitor C3.
Specifically, the resistor R3 is a resistor with a fixed value, and the capacitor C3 is a capacitor with a fixed value, which can be selected according to different applications.
Specifically, theleft filter circuit 9 and/or theright filter circuit 10 further include a second digital-to-analog converter, connected to the output end of themixer 14, for performing digital-to-analog conversion on the left-ear audio signal SL3 or the right-ear audio signal SR3 obtained after mixing to correspondingly output the signals to theleft speaker 11 or theright speaker 12.
Theaudio chip 100 for sound quality optimization processing provided by the invention; adjusting the gain and the phase of an audio signal which can be an interference source through a plurality of gain and phase adjusters to generate an adjusting signal; adding the required audio signal and the corresponding adjusting signal through a plurality of adders to generate an adjusted required audio signal; further filtering other interferences such as interference of power supply reference voltage and the like through a filter circuit based on the adjusted required audio signal to obtain an audio signal output to the loudspeaker; the conventional noise is removed, the sound effect of the earphone is guaranteed, and the hearing experience of a user is improved.
Example 2:
the present embodiment provides an earphone having theaudio chip 100 with the sound quality optimization processing, which has the same performance and is not described again.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (15)
1. An audio chip for sound quality optimization processing, comprising:
the audio processing circuit is used for receiving the audio signal transmitted by the audio signal output terminal and generating a left channel signal and a right channel signal;
the first gain and phase adjuster is connected with the audio processing circuit and is used for adjusting the gain and the phase of the right channel signal to generate a first adjusting signal;
a first adder, connected to the first gain and phase adjuster and the audio processing circuit, for adding the left channel signal and the first adjustment signal to generate an adjusted left channel signal;
the second gain and phase adjuster is connected with the audio processing circuit and is used for adjusting the gain and the phase of the left channel signal to generate a second adjusting signal;
a second adder, connected to the second gain and phase adjuster and the audio processing circuit, for adding the right channel signal and the second adjustment signal to generate an adjusted right channel signal;
and obtaining a left ear audio signal output to the left loudspeaker and a right ear audio signal output to the right loudspeaker based on the adjusted left channel signal and the adjusted right channel signal.
2. The audio chip for sound quality optimization processing according to claim 1, further comprising a first analog-to-digital converter for receiving a sound signal from a microphone and converting the sound signal into a digital input signal;
a third gain and phase adjuster, connected to the audio processing circuit, for adjusting the gain and phase of the left channel signal and the right channel signal to generate a third adjustment signal;
and a third adder, connected to the first adc, the third gain and phase adjuster, and the audio processing circuit, for adding the digital input signal and the third adjustment signal to generate an adjusted digital input signal, and sending the adjusted digital input signal to the audio processing circuit.
3. The psychoacoustic optimization audio chip of claim 2, wherein the first gain and phase adjuster adjusts the amplitude of the right channel signal to be close to the amplitude of the left channel signal and to be opposite in phase to the previous one.
4. The psychoacoustic optimization processing audio chip of claim 2, wherein the second gain and phase adjuster adjusts the amplitude of the left channel signal to be close to the amplitude of the right channel signal and to be opposite in phase to the previous one.
5. The psychoacoustic optimization audio chip of claim 2, wherein the third gain and phase adjuster adjusts the amplitudes of the left channel signal and the right channel signal to be close to the digital input signal and to be opposite in phase to the previous signals.
6. The audio chip for sound quality optimization processing according to any one of claims 3 to 4, further comprising a left filter circuit, connected to the first adder, the power reference voltage, and the audio processing circuit, for mixing the bass signal output by the audio processing circuit with the adjusted left channel signal to generate a left-ear audio signal.
7. The audio chip for sound quality optimization processing according to claim 6, further comprising a right filter circuit, connected to the second adder, the power reference voltage, and the audio processing circuit, for mixing the bass signal output by the audio processing circuit with the adjusted right channel signal to generate a right-ear audio signal.
8. The audio chip for sound quality optimization processing according to claim 7, wherein the left filter circuit and/or the right filter circuit comprises:
the reverse input end of the amplifier is connected with the bass signal, and the forward input end of the amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the bass signal;
the audio mixer is formed by connecting two output ends of a capacitor C1 and a resistor R1 which are connected in series and a capacitor C2 and a resistor R2 which are connected in series in parallel, wherein the output end of the amplifier is connected with the capacitor C1, a left channel signal or a right channel signal after adjustment is connected with the capacitor C2, and the output end of the audio mixer is connected with a left loudspeaker or a right loudspeaker.
9. The audio chip for sound quality optimization processing according to claim 7, wherein the left filter circuit and/or the right filter circuit comprises:
the reverse input end of the first amplifier is connected with the bass signal, and the forward input end of the first amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the bass signal;
the reverse input end of the second amplifier is connected with the adjusted left channel signal or the adjusted right channel signal, and the forward input end of the second amplifier is connected with a power supply reference voltage and used for generating a large-amplitude gain function on the adjusted left channel signal or the adjusted right channel signal;
the audio mixer is formed by parallelly connecting the output of capacitor C1 and resistance R1 and capacitor C2 and resistance R2 two ways that concatenate in series, wherein capacitor C1 is connected to the output of first amplifier, capacitor C2 is connected to the output of first amplifier, and left speaker or right speaker are connected to the audio mixer output.
10. The audio chip for sound quality optimization processing according to claim 8 or 9, wherein the capacitance values of the capacitor C1 and the capacitor C2 are greater than or equal to 45 μ F.
11. The audio chip for sound quality optimization processing according to claim 8 or 9, wherein the power reference voltage is connected to the positive input terminal of the amplifier, the first amplifier or the second amplifier via a resistor R3, and the positive input terminal of the amplifier, the first amplifier or the second amplifier is further connected to ground via a capacitor C3.
12. The audio chip for sound quality optimization processing according to claim 11, wherein the resistor R3 is a variable resistor, and the capacitor C3 is a variable capacitor.
13. The audio chip for sound quality optimization according to claim 11, wherein the resistor R3 is a resistor with a fixed value, and the capacitor C3 is a capacitor with a fixed value, the fixed value being selectable according to different applications.
14. The audio chip for sound quality optimization according to claim 12 or 13, wherein the left filter circuit and/or the right filter circuit further includes a second digital-to-analog converter, connected to the output end of the mixer, for performing digital-to-analog conversion on the left-ear audio signal or the right-ear audio signal obtained after mixing to correspondingly output the signals to the left speaker or the right speaker.
15. A headphone, characterized in that it has the audio chip of the sound quality optimization processing described in any one of claims 1 to 14.
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| CN202110480467.0ACN113242484A (en) | 2021-04-30 | 2021-04-30 | Audio chip and earphone that tone quality optimization handled |
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| CN202110480467.0ACN113242484A (en) | 2021-04-30 | 2021-04-30 | Audio chip and earphone that tone quality optimization handled |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM262947U (en)* | 2004-06-16 | 2005-04-21 | Aqs Corp | Audio-signal processing circuitry of the earphone |
| CN104661149A (en)* | 2013-11-25 | 2015-05-27 | 瑞昱半导体股份有限公司 | Signal processing circuit and related signal processing method applied to earphone microphone set |
- 2021
- 2021-04-30CNCN202110480467.0Apatent/CN113242484A/enactivePending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM262947U (en)* | 2004-06-16 | 2005-04-21 | Aqs Corp | Audio-signal processing circuitry of the earphone |
| CN104661149A (en)* | 2013-11-25 | 2015-05-27 | 瑞昱半导体股份有限公司 | Signal processing circuit and related signal processing method applied to earphone microphone set |
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