CN104333832B - The switching circuit and its method of biphone and loud speaker output - Google Patents
The switching circuit and its method of biphone and loud speaker output Download PDFInfo
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- CN104333832B CN104333832B CN201410694308.0A CN201410694308A CN104333832B CN 104333832 B CN104333832 B CN 104333832B CN 201410694308 A CN201410694308 A CN 201410694308A CN 104333832 B CN104333832 B CN 104333832B
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- earphone
- loud speaker
- switching
- biphone
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Abstract
The invention discloses the switching circuits of a kind of biphone and loud speaker output, headset output interface including audio coding decoding chip is separately connected earphone and loud speaker with speaker output interface, and the setting of biphone output interface is on same output detection pin, biphone output interface is connected by making the Schottky diode of OR circuit with the input terminal of analog switch respectively, the output end of analog switch is connect by detecting pin with the switching signal of audio coding decoding chip, compares power supply by 3.3V and 1.65V compares the switching output of power supply controlling loudspeaker and earphone.The present invention is overcome in the audio ＆ video equipment with biphone and loud speaker output, earphone cannot stablize the difficulty of switching with loud speaker output so that when plugging any earphone, detection signal is sent to rapidly audio chip, audio chip makes switching reaction, is automatically opened or closed loud speaker.It has used amplifier that circuit is followed to do simultaneously to be isolated, has ensured that the signal of two earphones output is independent of each other.
Description
Technical field
The invention belongs to audio output switching methods, and in particular to the switching circuit of a kind of biphone and loud speaker output and
Its method.
Background technology
Currently, mostly having biphone and loud speaker output, when being inserted into any one earphone, loud speaker in audio ＆ video equipment
Sound is not exported, when pulling out earphone, loud speaker exports sound.Entire handoff procedure is seamless automatic switchover, need to ensure to cut
Change work(into.
But some audio coding decoding chips have been internally integrated earphone and loud speaker switching control function, but it is most of
Chip is all single earpiece output, does not support the automatic switchover between biphone and loud speaker；There are also switch for specially doing
The chip of function, but due to expensive, it is not particularly suited for product volume production；Program control is commonly used also in some developers
Handoff functionality processed, but the method often will appear program exception problem, achieve the effect that instead bad.
Invention content
The present invention is to solve the above problem, and a kind of earphone proposed is exported with earphone, earphone and loud speaker are defeated
The switching circuit and its method of the biphone and loud speaker output of extraction are independent of each other and supported simultaneously or separately to access between going out.
The technical scheme is that：
The switching circuit of the biphone of the present invention and loud speaker output, includes the headset output interface of audio coding decoding chip
It is separately connected earphone and loud speaker with speaker output interface, and the setting of biphone output interface detects pin in same output
On, biphone output interface is connected by making the Schottky diode of OR circuit with the input terminal of analog switch respectively, simulation
The output end of switch connect by detecting pin with the switching signal of audio coding decoding chip, by 3.3V compare power supply with
1.65V compares power supply controlling loudspeaker and the switching of earphone exports.
The switching method of the biphone and loud speaker output, specially：
I when being inserted into earphone, and output detection pin and the ground of earphone disconnect, and Schottky diode exports high to analog switch
Level, analog switch transmits signal to the switching signal of audio coding decoding chip detection pin, and switches to audio coding decoding core
1.65V needed for piece switches voltage, and the output of audio coding decoding chip mute speaker opens simultaneously earphone output；
II when pulling out earphone, the output of earphone detection pin and ground again short circuit, and Schottky diode is to analog switch
Low level is exported, analog switch transmits signal to the switching signal of audio coding decoding chip detection pin, and switches to audio volume
3.3V needed for decoding chip switches voltage, and audio coding decoding chip opens loud speaker output, simultaneously closes off earphone output.
The beneficial effects of the invention are as follows：
The present invention is overcome in the audio ＆ video equipment with biphone and loud speaker output, and earphone exports not with loud speaker
The difficulty of switching can be stablized so that when plugging any earphone, detection signal is sent to rapidly audio chip, and audio chip is made
Switching reaction, is automatically opened or closed loud speaker.It has used amplifier that circuit is followed to do simultaneously to be isolated, has ensured what two earphones exported
Signal is independent of each other.
Description of the drawings
Fig. 1 is the fundamental diagram of the present invention；
Fig. 2 is the fundamental diagram of analog switch of the present invention.
Specific implementation mode
Hereinafter, with reference to accompanying drawings and embodiments, the present invention is described in detail：
As shown in Figs. 1-2, the switching circuit of biphone of the invention and loud speaker output, including audio coding decoding chip
Headset output interface is separately connected earphone and loud speaker with speaker output interface, and biphone output interface is arranged same defeated
Go out to detect on pin, biphone output interface is respectively by making the Schottky diode of OR circuit and the input terminal of analog switch
It is connected, the output end of analog switch is connect by detecting pin with the switching signal of audio coding decoding chip, is compared by 3.3V
Power supply and 1.65V compare power supply controlling loudspeaker and the switching of earphone exports.Audio coding decoding chip model CX20709.
Also it is connected with the amplifier as isolation circuit between the biphone output interface and Schottky diode in turn
Follow circuit, audio-frequency amplifier and RC filters.Since different earphones are inconsistent to ground resistance, so suitably modified amplifier follows
Device circuit, becomes scaling circuit, that is, while having isolation features, can also meet the need for driving different earphones
It wants.
The switching method of the biphone and loud speaker output, specially：
I when being inserted into earphone, and output detection pin and the ground of earphone disconnect, and Schottky diode exports high to analog switch
Level, analog switch transmit the 1.65V needed for audio coding decoding chip to the switching signal of audio coding decoding chip detection pin
Switch voltage, the output of audio coding decoding chip mute speaker opens simultaneously earphone output；
II when pulling out earphone, the output of earphone detection pin and ground again short circuit, and Schottky diode is to analog switch
Low level is exported, analog switch is to needed for the switching signal of audio coding decoding chip detection pin transmission audio coding decoding chip
3.3V switches voltage, and audio coding decoding chip opens loud speaker output, simultaneously closes off earphone output.
When the biphone output interface is inserted at least one earphone, Schottky diode is as OR circuit to simulation
Switch output high level.
The switching circuit of the present invention, circuit, analog switch and Schottky diode are followed by audio coding decoding chip, amplifier
Circuit forms, and wherein amplifier follows circuit and analog switch cost relatively low.Audio coding decoding chip and analog switch are that this cuts
Change the main working parts of circuit, when selection mainly considers chip operating voltage and switch speed, to meet when being inserted into ear
When machine, loud speaker does not export sound at once；When extracting earphone, loud speaker restores to export the effect of sound at once.Guarantee is entirely cut
The process of changing should be reliable, seamless.
The analog switch path of the present invention is the key that the automatic switch-over circuit, can correctly carry out plug detection, and handle
It is basic function needed for this circuit that the plug signal detected, which feeds back to audio coding decoding chip and switches over,.The present invention's cuts
Circuit is changed using analog switch and Schottky diode as the main devices on toggle path, and following using amplifier composition
Circuit participates in plug signal isolation.Since analog switch speed is fast, ns grades are had reached, therefore reach the effect of seamless switching.
Meanwhile integrated transporting discharging follows circuit, can be very good to accomplish signal isolation, improves switching accuracy.
Due to there are one the plug detection signals on audio chip, so two earphones need to share a switching letter
Number, i.e., the plug signal of two earphone sockets is needed while being connected on the same detection pin of chip, using Schottky diode
As OR circuit, as long as be inserted into there are one earphone with realizing, so that it may to realize the function of switching mute speaker output.When
When being only inserted an earphone, the level being added on another earphone can be fed back in earphone output, to influence to export quality.Institute
The follower circuit for having used amplifier to form with this circuit, which is done, is isolated, and ensures that the signal of two earphones output is independent of each other.
Claims (4)
1. the switching circuit of a kind of biphone and loud speaker output, it is characterised in that：The earphone output of audio coding decoding chip connects
Mouth is separately connected earphone and loud speaker with speaker output interface, and two headset output interfaces are arranged in same output detection pipe
On foot, two headset output interfaces are respectively by being used as the Schottky diode of OR circuit and the input terminal phase of analog switch
Even, the output end of analog switch is connect by detecting pin with the switching signal of audio coding decoding chip, more electric by 3.3V
Source and 1.65V compare power supply controlling loudspeaker and the switching of earphone exports.
2. the switching circuit of biphone according to claim 1 and loud speaker output, it is characterised in that：Headset output interface
It is also connected in turn between Schottky diode and follows circuit, audio-frequency amplifier and RC filtering as the amplifier of isolation circuit
Device.
3. the switching method of biphone according to claim 1 and loud speaker output, it is characterised in that：
I when being inserted into earphone, and output detection pin and the ground of earphone disconnect, and Schottky diode exports high electricity to analog switch
Flat, analog switch transmits signal to the switching signal of audio coding decoding chip detection pin, and switches to audio coding decoding chip
Required 1.65V switches voltage, and the output of audio coding decoding chip mute speaker opens simultaneously earphone output；
II when pulling out earphone, and output detection pin and the ground again short circuit of earphone, Schottky diode are exported to analog switch
Low level, analog switch transmits signal to the switching signal of audio coding decoding chip detection pin, and switches to audio coding decoding
3.3V needed for chip switches voltage, and audio coding decoding chip opens loud speaker output, simultaneously closes off earphone output.
4. the switching method of biphone according to claim 3 and loud speaker output, it is characterised in that：When two earphones are defeated
When outgoing interface is inserted at least one earphone, Schottky diode exports high level as OR circuit to analog switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410694308.0A CN104333832B (en) | 2014-11-27 | 2014-11-27 | The switching circuit and its method of biphone and loud speaker output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410694308.0A CN104333832B (en) | 2014-11-27 | 2014-11-27 | The switching circuit and its method of biphone and loud speaker output |
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| Publication Number | Publication Date |
|---|---|
| CN104333832A CN104333832A (en) | 2015-02-04 |
| CN104333832B true CN104333832B (en) | 2018-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410694308.0A Active CN104333832B (en) | 2014-11-27 | 2014-11-27 | The switching circuit and its method of biphone and loud speaker output |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0853442A2 (en) * | 1997-01-08 | 1998-07-15 | Matsushita Electric Industrial Co., Ltd. | Earphone |
| CN203645804U (en) * | 2013-12-27 | 2014-06-11 | 济南途易网络技术有限公司 | Convertible multifunctional dual-plug mobile phone earphones |
| CN103974163A (en) * | 2014-05-28 | 2014-08-06 | 深圳市中兴移动通信有限公司 | Earphone compatible method, earphone compatible device and mobile terminal |
| CN104113647A (en) * | 2013-04-22 | 2014-10-22 | 昆达电脑科技(昆山)有限公司 | Anti-interference conference telephone |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7916875B2 (en) * | 2005-12-14 | 2011-03-29 | Integrated Device Technology, Inc. | Audio input-output module, plug-in device detection module and methods for use therewith |
-
2014
- 2014-11-27 CN CN201410694308.0A patent/CN104333832B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0853442A2 (en) * | 1997-01-08 | 1998-07-15 | Matsushita Electric Industrial Co., Ltd. | Earphone |
| CN104113647A (en) * | 2013-04-22 | 2014-10-22 | 昆达电脑科技(昆山)有限公司 | Anti-interference conference telephone |
| CN203645804U (en) * | 2013-12-27 | 2014-06-11 | 济南途易网络技术有限公司 | Convertible multifunctional dual-plug mobile phone earphones |
| CN103974163A (en) * | 2014-05-28 | 2014-08-06 | 深圳市中兴移动通信有限公司 | Earphone compatible method, earphone compatible device and mobile terminal |
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| Publication number | Publication date |
|---|---|
| CN104333832A (en) | 2015-02-04 |
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Address after: 300384 Tianjin Huayuan Industrial Area (outside the ring) 8 hahihua two road. Applicant after: Tiandi Weiye Technology Co., Ltd. Address before: 300384 Tianjin Xiqing District Huayuan new technology Industrial Park (outside the ring) 8 hahihua two road. Applicant before: Tianjin Tiandy Digital Technology Co., Ltd. |
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