CN1774143A - Earphone output circuit capable of omitting block capacitor - Google Patents
Earphone output circuit capable of omitting block capacitor Download PDFInfo
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- CN1774143A CN1774143A CN 200510113462 CN200510113462A CN1774143A CN 1774143 A CN1774143 A CN 1774143A CN 200510113462 CN200510113462 CN 200510113462 CN 200510113462 A CN200510113462 A CN 200510113462A CN 1774143 A CN1774143 A CN 1774143A
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- circuit
- follower
- power amplifier
- output circuit
- comparison circuit
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Abstract
An earphone output circuit without stopping capacity consists of power amplifying circuit formed by a comparison circuit, loudspeaker with two ends being connected to power amplifying circuit and to comparison circuit output of follower separately, a follower formed by comparison circuit with power supply voltage and reference voltage.
Description
Technical field
The present invention relates to earphone output circuit, relate in particular to the earphone output circuit in the voice frequency process chip field.
Background technology
As everyone knows, in existing mobile phones design, the left and right sides earphone pin of chip is to connect by capacitance is corresponding with left and right sides earphone respectively, and the common port of left and right sides earphone also will connect truly by a bypass electric capacity again.As shown in Figure 1, the capacitance that two electric capacity promptly are connected with the earphone left and right acoustic channels respectively among the figure, and the direct ground connection of shunt capacitance.This traditional output circuit has following three defectives:
(1) two capacitance has taken the area of printed circuit board (PCB), thereby directly causes the increase of system cost;
(2) two capacitances cause very big impact noise;
(3) by formula f=1/ (the 2 π R of low-frequency cutoff effect
LC
o) as can be known, when cut-off frequency is low more, the capacitance that needs is just big more, the volume of electric capacity is also big more, thereby can cause above two results; But low-frequency cut-off frequency is provided with too high, will cause the loss of audio signal medium and low frequency component, and it is very poor that tone color also can become.
Summary of the invention
The technical scheme that the present invention need solve is to provide a kind of earphone output circuit Audio Processing chip, that save two capacitances that is applicable to.
Technical scheme of the present invention is as follows:
Comprise power amplifier and loud speaker, it is characterized in that also comprising a follower, constitute to have supply power voltage and reference voltage by comparison circuit; Described power amplifier also is made of a comparison circuit, and the two ends of loud speaker are connected with the comparison circuit output of power amplifier and follower respectively.
The comparison circuit of described follower can require to increase the resistance of different resistances according to the comparator multiplication factor.
Beneficial effect of the present invention is, compared with prior art, owing to dexterously comparator is connected with power amplifier, having replaced truly virtually, thereby under the prerequisite that keeps original function, save two capacitances, not only saved the printed substrate area, reduced system cost, eliminated impact noise, and owing to do not have the low-frequency cutoff problem, thereby make that the tonequality of sound is greatly improved.
Description of drawings
Fig. 1 is traditional power amplifier;
Fig. 2 is a circuit diagram of the present invention;
Fig. 3 is optimum embodiment of the present invention.
Embodiment
Below by specific embodiments and the drawings the present invention is elaborated.
As shown in Figure 2, the present invention includes power amplifier 1, loud speaker 2 and follower 3, power amplifier 1 is to have removed capacitance and shunt capacitance with the difference of Fig. 1; Follower 3 is made of a comparator, and the output input of comparator is than using the resistance of different resistances to realize according to actual conditions.Wherein Vref is a reference voltage, and VDD is the comparator supply power voltage, and IN is the audio signal source input.Comparator output is connected with an end of loud speaker 2, and power amplifier 1 also is connected to another defeated end of loud speaker.In the function of reality realizes, at IN input input signal, and carry out power amplifier by power amplifier 1, the ratio of Rf and Rin is used for adjusting output voltage, at circuit A point generation output voltage V a; Follower 3 circuit functions are to produce reference voltage Vref for loud speaker 2, as Va during greater than Vref, electric current flows into circuit B point through circuit A point, as Va during less than Vref, electric current flows into circuit A through circuit B point, so just can provide forward and reverse current according to the variation of Va, thereby also could produce electromagnetism concussion generation sound at loud speaker 2 Just because of this hearer is discerned, so the trend of electric current is with the wave mode of input signal or transmits from top to bottom or from bottom to top.
As Fig. 3 is another embodiment of the present invention, and follower 3 has increased feedback arrangement on the basis of Fig. 2, and the audio signal source output terminal that is about to power amplifier 1 is connected with the circuit input end of follower 3.Also increased by two resistance R 1, R2 is to adapt to different comparator values of magnification.Audio input signal to follower, can improve output voltage amplitude by this feedback arrangement, improves the quality of sound.In the function of reality realizes, input signal is a sine wave signal, from the input of IN end,, produce an output voltage V a at circuit A point through power amplifier 1, Va is as the input voltage of follower 3, follower 3 can produce a voltage Vb reverse with Va at circuit B point like this, and Va is a pair of reverse signal that exchanges with Vb, acts on loud speaker 2 simultaneously, produce 2 times to the voltage of Va, the hearer is discerned thereby make loud speaker 2 produce electromagnetism concussion generation sound.
Do not exceeding in claims disclosed scope of the present invention and saving under the situation of capacitance spirit, any various modifications, interpolation and replacement all belong to protection scope of the present invention.
Claims (3)
1. earphone output circuit that saves capacitance, comprise power amplifier and loud speaker, it is characterized in that: also comprise a follower, constitute by comparison circuit, have supply power voltage and reference voltage, described power amplifier also is made of a comparison circuit, and the two ends of loud speaker are connected with the comparison circuit output of power amplifier and follower respectively.
2. a kind of earphone output circuit that saves capacitance as claimed in claim 1 is characterized in that: also comprise a feedback arrangement, the audio signal source of described power amplifier is electrically connected with the signal input of follower comparative structure.
3. a kind of earphone output circuit that saves capacitance as claimed in claim 1 or 2 is characterized in that, the comparison circuit of described follower can require to increase the resistance of different resistances according to multiplication factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510113462 CN1774143A (en) | 2005-10-13 | 2005-10-13 | Earphone output circuit capable of omitting block capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510113462 CN1774143A (en) | 2005-10-13 | 2005-10-13 | Earphone output circuit capable of omitting block capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1774143A true CN1774143A (en) | 2006-05-17 |
Family
ID=36760851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510113462 Pending CN1774143A (en) | 2005-10-13 | 2005-10-13 | Earphone output circuit capable of omitting block capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1774143A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377088A (en) * | 2011-06-15 | 2012-03-14 | 北京天地融科技有限公司 | Audio signal receiving and transferring device |
| CN102387429A (en) * | 2011-07-18 | 2012-03-21 | 北京天地融科技有限公司 | Audio signal switching device and audio signal transmission system |
| CN103414071A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
| CN103414070A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
| CN103782609A (en) * | 2011-06-03 | 2014-05-07 | 伯斯有限公司 | Communications headset power provision |
-
2005
- 2005-10-13 CN CN 200510113462 patent/CN1774143A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103782609A (en) * | 2011-06-03 | 2014-05-07 | 伯斯有限公司 | Communications headset power provision |
| CN103782609B (en) * | 2011-06-03 | 2017-05-03 | 伯斯有限公司 | Communications headset power provision |
| CN102377088A (en) * | 2011-06-15 | 2012-03-14 | 北京天地融科技有限公司 | Audio signal receiving and transferring device |
| CN103414071A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
| CN103414070A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal receiving and switching device |
| CN103414071B (en) * | 2011-06-15 | 2016-08-10 | 天地融科技股份有限公司 | A kind of audio signal reception and switching device |
| CN103414070B (en) * | 2011-06-15 | 2016-08-10 | 天地融科技股份有限公司 | A kind of audio signal reception and switching device |
| CN102387429A (en) * | 2011-07-18 | 2012-03-21 | 北京天地融科技有限公司 | Audio signal switching device and audio signal transmission system |
| CN102387429B (en) * | 2011-07-18 | 2014-04-02 | 天地融科技股份有限公司 | Audio signal switching device and audio signal transmission system |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20060517 |