CN101489165B - Audio frequency compensation apparatus - Google Patents
Audio frequency compensation apparatus Download PDFInfo
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- CN101489165B CN101489165B CN 200810300105 CN200810300105A CN101489165B CN 101489165 B CN101489165 B CN 101489165B CN 200810300105 CN200810300105 CN 200810300105 CN 200810300105 A CN200810300105 A CN 200810300105A CN 101489165 B CN101489165 B CN 101489165B
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- potentiometer
- pass filter
- voice signal
- frequency compensation
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Abstract
An audio compensating device comprises a left input end and a right input end which are respectively used for receiving a left channel sound input signal and a right channel sound input signal that are output by a player. The audio compensating device also comprises a left output end and a right output end which are respectively used for outputting the left channel sound input signal and the right channel sound input signal to an earphone. The audio compensating device further comprises a frequency compensating unit. The frequency compensating unit is coupled between the left and right input ends and the left and right output ends, is used for selecting the low range component of left and right channel sound input signals which are input from the left input end and the right input end, and crossly couples the low range component to the left and right channel sound input signals after amplifying and adjusting amplitude. The audio compensating device can improve the bass effect of sound output from the earphone and can be realized with a simple analog circuit.
Description
Technical field
The present invention relates to a kind of audio frequency compensation apparatus, relate in particular to a kind of audio frequency compensation apparatus with bass compensation.
Background technology
Along with the development of Audiotechnica, audio player is more and more used in life.So, when using the bad earphone of bass domain response to carry out playback, the low range composition of audio player output sound can not fully be play on earphone, causes the bass effect of player output sound relatively poor.
Open day is on November 6th, 1996, and publication number is that the Chinese patent of CN1135120 has disclosed a kind of bass bossting circuit.This circuit adopts low pass filter to extract reproduction range following low range composition in earphone bass territory in audio input signal, produce the even-order harmonic of above-mentioned low range composition through full-wave rectification, extract 2 subharmonic in this even-order harmonic, be added on audio input signal after it is amplified to proper level.So, the low range composition of the left and right acoustic channels audio input signal that the low-pass filter circuit of this bass bossting circuit is chosen can not be adjusted, and causes the bass effect of earphone output sound not ideal enough.
Based on above problem, the invention provides a kind of audio frequency compensation apparatus, can adjust the low range composition of the output sound chosen, improve the bass effect of earphone output sound.
Summary of the invention
A kind of audio frequency compensation apparatus, comprise that a left input and a right input are used for receiving respectively a L channel audio input signal and a right channel sound input signal of a player output, one left output and a right output are used for exporting respectively described left and right sound channels audio input signal, one frequency compensation unit, described frequency compensation unit comprises one first second-order low-pass filter circuit, one first capacitance, one the 3rd potentiometer, one second second-order low-pass filter circuit, one second capacitance and one the 4th potentiometer.Described the first second-order low-pass filter circuit, the first capacitance and the 3rd potentiometer are connected in series between described right input and described left output successively; Described the second second-order low-pass filter circuit, the second capacitance and the 4th potentiometer are connected in series between described left input and described right output successively.Described the first second-order low-pass filter circuit comprises one first potentiometer, one first operational amplifier, described the first potentiometer has one and adjusts the in-phase input end that end is connected in described the first amplifier, regulate this adjustment end with the low range composition of the right channel sound input signal that changes described the first second-order low-pass filter Electric circuit selection, cross-couplings is to described L channel audio input signal with its amplification and after adjusting amplitude.Described the second second-order low-pass filter circuit comprises one second potentiometer, one second operational amplifier, described the second potentiometer has one and adjusts the in-phase input end that end is connected in described the second amplifier, regulate this adjustment end with the low range composition of the L channel audio input signal that changes described the second second-order low-pass filter Electric circuit selection, cross-couplings is to described right channel sound input signal with its amplification and after adjusting amplitude.
The present invention's advantage is, above-mentioned audio frequency compensation apparatus can be adjusted the low range composition of choosing, thereby improves the bass effect of earphone output sound.
Description of drawings
Fig. 1 is the schematic diagram that audio frequency compensation apparatus of the present invention is positioned at player.
Fig. 2 is the circuit diagram of audio frequency compensation apparatus one execution mode of the present invention.
To be audio frequency compensation apparatus of the present invention be connected in schematic diagram between player and earphone as a standalone module to Fig. 3.
Fig. 4 is the schematic diagram that audio frequency compensation apparatus of the present invention is positioned at earphone inside.
Embodiment
See also Fig. 1.The present invention's audio frequency compensation apparatus 1 is placed in player 2 inside.Described player comprises that further an audio output interface 21 is used for connecting an earphone 3.The audio signal of described player 2 outputs is carried out audio compensation through described audio frequency compensation apparatus 1, then inputs to described earphone 3 through described audio output interface 21 and plays.
See also Fig. 2, Fig. 2 is the circuit diagram of audio frequency compensation apparatus one execution mode of the present invention.Described audio frequency compensation apparatus 1 comprises a right input 11, is used for receiving a right channel sound input signal S1; One left input 12 is used for receiving a L channel audio input signal S2; One right output 13 is used for exporting described right channel sound input signal S1; And a left output 14, be used for exporting described L channel audio input signal S2.Described audio frequency compensation apparatus 1 also comprises a frequency compensation unit 10.Described frequency compensation unit 10 be coupled in described input 11,12 and output 13,14 between, be used for choosing the low range composition of the L channel audio input signal S2 that described right channel sound input signal S1 that described right input 11 receives and left input 12 receive, after described low range composition is carried out corresponding amplification and adjusts amplitude respectively cross-couplings to the described L channel audio input signal S2 of the described right channel sound input signal S1 of described right output 13 outputs and 14 outputs of left output.
Described frequency compensation unit 10 comprises one first second-order low-pass filter circuit 15, one first capacitance C3, one the 3rd potentiometer SW3; One second second-order low-pass filter circuit 16, one second capacitance C6, one the 4th potentiometer SW4.The input of described the first second-order low-pass filter circuit 15 is electrically connected on described right input 11, and its output is electrically connected to and described the first capacitance C3 one end.The other end of described capacitance C3 is electrically connected on the input of described the 3rd potentiometer SW3, the output head grounding of described the 3rd potentiometer SW3, and it adjusts the left output 14 that end 17 is electrically connected on described audio frequency compensation apparatus 1.Described right channel sound input signal S1 chooses low range composition and amplifies and process through described the first second-order low-pass filter circuit 15, and suppress direct current signal through described the first capacitance C3, then after carrying out range-adjusting, described the 3rd potentiometer SW3 obtains a right low range voice signal S1 '.The described adjustment end 17 of described the 3rd potentiometer SW3 is coupled to the described L channel audio input signal S2 of described left output 14 outputs with the low range voice signal S1 ' in the described right side, and obtaining a coupling voice signal S2+S1 ', the output sound signal output of voice signal S2+S1 ' as left output 14 will be coupled.In different execution modes, can adjust by an outer adjusting knob (not shown) of being located on player 2 the adjustment end 17 of described the 3rd potentiometer SW3, thereby change the amplitude size of the low range voice signal S1 ' in the described right side, make its amplitude ripple with described L channel audio input signal S2 consistent.
Equally, the input of described the second second-order low-pass filter circuit 16 is electrically connected on described right input 12, and its output is electrically connected to and described the second capacitance C6 one end.The other end of described capacitance C6 is electrically connected to the input with described the 4th potentiometer SW4, the output head grounding of described the 4th potentiometer SW4, and it adjusts the right output 13 that end 18 is electrically connected on described audio frequency compensation apparatus 1.Described L channel audio input signal S2 chooses low range composition and amplifies and process through described the second second-order low-pass filter circuit 16, and suppress direct current signal through described the second capacitance C6, then carry out range-adjusting through described the 4th potentiometer SW4 and process and obtain a left low range voice signal S2 '.The described adjustment end 18 of described the 4th potentiometer SW4 is coupled to the described right channel sound input signal S1 of described right output 13 outputs with the low range voice signal S2 ' in a described left side, and obtaining a coupling voice signal S1+S2 ', the output sound signal output of voice signal S1+S2 ' as described right output 13 will be coupled.Equally, the adjustment end 18 of described the 4th potentiometer SW4 can also be adjusted by an outer adjusting knob (not shown) of being located on player 2, thereby change the amplitude size of the low range voice signal S2 ' in a described left side, make its amplitude with the described right channel sound input signal of described right output 13 outputs consistent.
Described the first second-order low-pass filter circuit 15 further comprises resistance R 1, R2 and R3, one first potentiometer SW1, capacitor C 1, C2, one first operational amplifier U1.Described resistance R 1 and described the first potentiometer SW1 are series between the in-phase input end of described right input 11 and described the first operational amplifier U1; Wherein, the adjustment end of described the first potentiometer SW1 is electrically connected on the in-phase input end of described the first operational amplifier U1.Described resistance R 2 is connected between the end of oppisite phase and ground of described the first operational amplifier U1, and described resistance R 3 is connected between the input and end of oppisite phase of described the first operational amplifier U1, and realizes the negative feedback of described operational amplifier U1 with described resistance R 2.Described capacitor C 1, C2, resistance R 1 and the first potentiometer SW1 form secondary RC filtering link, and wherein said capacitor C 1 is electrically connected on the output of described operational amplifier U1, is used for introducing appropriate positive feedback to improve amplitude-frequency characteristic; Described capacitor C 2 is electrically connected between the in-phase input end and ground of described the first operational amplifier U1.Described the first potentiometer SW1 can adjust it by an outer adjusting knob (not shown) of being located on player 2 and adjust end, with the frequency characteristic of the low range voice signal in the described right side that changes described secondary RC filtering link output.
Described the second second-order low-pass filter circuit 16 further comprises resistance R 4, R5 and R6, one second potentiometer SW2, capacitor C 4, C5, one second operational amplifier U2.Described resistance R 4 and described the second potentiometer SW2 are series between the in-phase input end of described left input 12 and described the second operational amplifier U2; Wherein, the adjustment end of described the second potentiometer SW2 is electrically connected on the in-phase input end of described the second operational amplifier U2.Described resistance R 5 is connected between the end of oppisite phase and ground of described the second operational amplifier U2, and described resistance R 6 is connected between the input and end of oppisite phase of described the second operational amplifier U2, and realizes the negative feedback of described operational amplifier U1 with described resistance R 5.Described capacitor C 4, C5, resistance R 4 and the second potentiometer SW2 form secondary RC filtering link, and wherein said capacitor C 4 is electrically connected on the output of described operational amplifier U2, is used for introducing appropriate positive feedback to improve amplitude-frequency characteristic; Described capacitor C 5 is electrically connected between the in-phase input end and ground of described the first operational amplifier U1.Described the second potentiometer SW2 can adjust it by an outer adjusting knob (not shown) of being located on player 2 and adjust end, with the frequency characteristic of the low range voice signal in a described left side that changes described secondary RC filtering link output.
Described the first second-order low-pass filter circuit 15 of described right channel sound input signal S1 input, after described secondary RC filtering link is chosen low range composition and is amplified by described the first operational amplifier U1, by the first capacitance C3 filtering flip-flop, and carry out range-adjusting through described the 3rd potentiometer SW3 and obtain a right low range voice signal S1 ', the low range voice signal S1 ' in the described right side is at the described left output 14 described L channel audio input signal S2 of coupling, therefore described left output 14 output one coupling voice signal S2+S1 '.
Equally, described L channel audio input signal S2 obtains a left low range voice signal S2 ' after described the second low-pass filter circuit 16, the second capacitance C6 and the 4th potentiometer SW4 process, the low range voice signal S2 ' in a described left side is in described right output 13 and the right channel sound input signal S1 of institute coupling, therefore described right output 13 output one coupling voice signal S1+S2 '.
See also Fig. 3 and 4.To be audio frequency compensation apparatus of the present invention be connected in schematic diagram between player and earphone as a standalone module to Fig. 3.Described audio frequency compensation apparatus 1 is one to be connected in the standalone module between player 2 ' and earphone 3.Described player 2 ' is connected in described frequency compensation device 1 by an audio output interface 21, and described audio frequency compensation apparatus 1 connects an earphone 3.The left and right sound channels audio input signal of player 2 ' output after described audio output interface 21 inputs to described audio frequency compensation apparatus 1 and carries out audio compensation, output one coupling voice signal.Described earphone 3 is play this coupling voice signal.Fig. 4 is the schematic diagram that audio frequency compensation apparatus of the present invention is positioned at earphone inside.Audio frequency compensation apparatus 1 of the present invention is placed in earphone a 3 ' inside.Described earphone 3 also comprises an earphone body 31.Described player 2 ' is via described audio interface 21 output one L channel voice signal and right channel sound signals, described earphone 3 ' receives described left and right sound channels voice signal, described audio frequency compensation apparatus 1 is processed described left and right sound channels voice signal and exports a cross-couplings voice signal, and described earphone body 31 is exported described cross-couplings voice signal.In Fig. 3 and Fig. 4, the audio compensation method of described audio frequency compensation apparatus 1 is identical with Fig. 1, therefore repeat no more.
In sum, obtain respectively coupling voice signal S1+S2 ' and S2+S1 ' via described right output 13 and described left output 14.
Therefore, adopt with upper type, audio frequency compensation apparatus can carry out bass compensation to the voice signal of player output, and the bass part of the voice signal of player output is strengthened, and strengthens bass effect, thereby obtains a stereo output.
Claims (3)
1. audio frequency compensation apparatus, comprise that a left input and a right input are used for receiving respectively a L channel audio input signal and a right channel sound input signal, one left output and a right output are used for exporting respectively a described left side, the right channel sound input signal, one frequency compensation unit, described frequency compensation unit comprises one first second-order low-pass filter circuit, one first capacitance, one the 3rd potentiometer, one second second-order low-pass filter circuit, one second capacitance and one the 4th potentiometer, described the first second-order low-pass filter circuit and the first capacitance are connected in series between described right input and described left output, described the second second-order low-pass filter circuit and the second capacitance are connected in series between described left input and described right output, it is characterized in that, described the first second-order low-pass filter circuit comprises one first potentiometer, one first operational amplifier, described the first potentiometer has one and adjusts the in-phase input end that end is connected in described the first operational amplifier, regulate this adjustment end with a right low range voice signal of the described right channel sound input signal that changes described the first second-order low-pass filter Electric circuit selection, described the 3rd potentiometer comprises that an adjustment end is electrically connected on described left output, amplitude for the low range voice signal in the described right side of adjusting described the first second-order low-pass filter circuit output, the described adjustment end of described the 3rd potentiometer is coupled to the described L channel audio input signal of described left output output with the low range voice signal in the described right side, and obtain first the coupling voice signal, with the output sound signal output of this first coupling voice signal as left output, described the second second-order low-pass filter circuit comprises one second potentiometer, one second operational amplifier, described the second potentiometer has one and adjusts the in-phase input end that end is connected in described the second operational amplifier, regulate this adjustment end with a left low range voice signal of the described L channel audio input signal that changes described the second second-order low-pass filter Electric circuit selection, described the 4th potentiometer comprises that an adjustment end is electrically connected on described right output, amplitude for the low range voice signal in a described left side of adjusting described the second second-order low-pass filter circuit output, the described adjustment end of described the 4th potentiometer is coupled to the described right channel sound input signal of described right output output with the low range voice signal in a described left side, and obtain second the coupling voice signal, with the output sound signal output of this second coupling voice signal as right output.
2. audio frequency compensation apparatus as claimed in claim 1, is characterized in that, described audio frequency compensation apparatus is placed in described player.
3. audio frequency compensation apparatus as claimed in claim 1, is characterized in that, described audio frequency compensation apparatus is placed in described earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810300105 CN101489165B (en) | 2008-01-16 | 2008-01-16 | Audio frequency compensation apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810300105 CN101489165B (en) | 2008-01-16 | 2008-01-16 | Audio frequency compensation apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN101489165A CN101489165A (en) | 2009-07-22 |
| CN101489165B true CN101489165B (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810300105 Expired - Fee Related CN101489165B (en) | 2008-01-16 | 2008-01-16 | Audio frequency compensation apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297894A (en) | 2012-02-27 | 2013-09-11 | 华为终端有限公司 | Earphone power amplifier, working method and mobile terminal equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070515U (en) * | 1990-06-05 | 1991-01-30 | 万荣龙 | High-fidelity listen-distance adjustable device |
| CN1135120A (en) * | 1995-02-27 | 1996-11-06 | 松下电器产业株式会社 | Bass enhancement circuit |
| CN1582602A (en) * | 2001-10-17 | 2005-02-16 | 皇家飞利浦电子股份有限公司 | Bass frequency amplifying apparatus |
| CN1612469A (en) * | 2003-10-30 | 2005-05-04 | 新日本无线株式会社 | Bass boost circuit |
-
2008
- 2008-01-16 CN CN 200810300105 patent/CN101489165B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070515U (en) * | 1990-06-05 | 1991-01-30 | 万荣龙 | High-fidelity listen-distance adjustable device |
| CN1135120A (en) * | 1995-02-27 | 1996-11-06 | 松下电器产业株式会社 | Bass enhancement circuit |
| CN1582602A (en) * | 2001-10-17 | 2005-02-16 | 皇家飞利浦电子股份有限公司 | Bass frequency amplifying apparatus |
| CN1612469A (en) * | 2003-10-30 | 2005-05-04 | 新日本无线株式会社 | Bass boost circuit |
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| CN101489165A (en) | 2009-07-22 |
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