CN1535074A - 2.1 sound channel audio frequency signal switching circuit - Google Patents
2.1 sound channel audio frequency signal switching circuit Download PDFInfo
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- CN1535074A CN1535074A CNA031141064A CN03114106A CN1535074A CN 1535074 A CN1535074 A CN 1535074A CN A031141064 A CNA031141064 A CN A031141064A CN 03114106 A CN03114106 A CN 03114106A CN 1535074 A CN1535074 A CN 1535074A
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- earphone
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Abstract
An audio signal switching circuit for 2.1 channel in order to switch between loudspeaker and earphone is composed of power amplifier for amplifying the audio signals of two channels (AU-2CH) and outputting them to left and right loudspeakers, low-pass filter for AU-2CH signals, operating amplifier for amplifying the filtered audio signals and outputting them to auxiliary bass loudspeaker, and switch unit for switching audio signals between earphone and loudspeakers.
Description
(1) technical field
The present invention relates to a kind of 2.1 channel audio signal commutation circuits, in 2.1 sound channel systems according to the loading of earphone whether the technology that is outputted to earphone of loud speaker, particularly under the situation of not using the high price switching part, also can make audio signal switch to earphone.
(2) background technology
Usually with the loud speaker of 2 sound channel systems output, support by a preceding left side (FRONT-L) and the preceding right side (FRONT-R) sound channel.In this system, microprocessor detects earphone and connects upward earphone jack, and the output of 2 sound channels is cut off in the driving of control relay, and audio signal is exported by earphone.
In 2 sound channel systems in the past, detect earphone by microprocessor and connect upward earphone jack, then the output of 2 sound channels is cut off in the driving of control relay, and audio signal is exported by earphone.Because this technology has been used the relay block of high price, to such an extent as to the weakness that exists the cost of product to rise.
Even, for additional 2.1 sound channel systems of supporting 0.1 sound channel (SUB-WOOFER: assist woofer) except 2 general sound channels,, therefore be not easy the suitably output of switch audio owing to there is not suitable handoff functionality.
(3) summary of the invention
The purpose of this invention is to provide a kind of 2.1 channel audio signal commutation circuits, in 2.1 sound channel systems, the audio output signal of a current left side (FRONT-L) and the preceding right side (FRONT-R) sound channel is in being connected of earphone/when separating, according to the physics handover operation and controlled, the audio output signal of auxiliary woofer (SUB-WOOFER) sound channel is controlled by the switching transistor in the microprocessor.
For reaching above-mentioned purpose, 2.1 channel audio signal commutation circuits of the present invention, the audio output device for a plurality of channel audio signal of output is characterized in that comprising with lower member:,
First switching part only switches a part of channel audio output in above-mentioned a plurality of sound channel;
Second switching part except that switching above-mentioned a part of sound channel, at least also switches more than one channel audio output;
Output control part when above-mentioned second switching part is connected with earphone, is controlled above-mentioned first switching part and is cut off audio frequency output.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the block diagram of 2.1 channel audio signal commutation circuits of the present invention.
(5) embodiment
Fig. 1 is the block diagram according to 2.1 channel audio signal commutation circuits of the present invention, comprises with lower member:
Power amplification portion 1 is left speaker SP-FL before outputing to after the audio signal AU-2CH amplification Cheng Suoding power rank of 2 sound channels and preceding right loud speaker SP-FR;
The low pass filter 2 of the audio signal AU-2CH low-pass filtering of above-mentioned 2 sound channels;
Switching part 4, be loaded into earphone jack according to earphone, the splicing ear GND-L of preceding left speaker SP-FL and preceding right loud speaker SP-FR is separated or is connected from main splicing ear GND-Main with GND-R, when inserting earphone on the described earphone jack, the audio signal that outputs to loud speaker SP-FL and SP-FR from above-mentioned power amplification portion 1 is sent to earphone;
Whether output control part (microprocessor) 5 loads earphone on the identification earphone jack, and the output audio signal of control calculation amplification portion 3 is sent to auxiliary woofer (SP-SW).
Effect of the present invention as constituted above is described in detail as follows.
When not inserting on the earphone jack of 2.1 sound channel systems under the state of earphone, movable terminal a1, the a2 of switching part 4 switch SW 1, SW2 physically falls on fixed terminal b1, the b2 separately, and the splicing ear GND-L of therefore preceding left speaker SP-FL and the splicing ear GND-R of preceding right loud speaker SP-FR are connected to main splicing ear GND-Main by switch SW 1, SW2 separately.Then, above-mentioned preceding left speaker SP-FL and preceding right loud speaker SP-FR become the state that can drive.
Then, the audio signal AU-2CH of 2 sound channels is sent to power amplification portion 1, exports by left speaker SP-FL before above-mentioned and preceding right loud speaker SP-FR after the amplification success rate rank.Meanwhile, the audio signal AU-2CH of above-mentioned 2 sound channels is low pass filtering device 2 low-pass filtering, is suitably exported by auxiliary woofer (SP-SW) after the amplification by calculation amplification portion 3 again.
The user is for by acoustic information such as earphone music appreciating, and when inserting earphone on the earphone jack, movable terminal a1, the a2 of above-mentioned switching part 4 switch SW 1, SW2 be falling on fixed terminal c1, the c2 by physics separately.Thereupon, splicing ear GND-L, the GND-R of above-mentioned preceding left speaker SP-FL and preceding right loud speaker SP-FR become closed condition, so these become the state that can not drive.
At this moment, output control part 5 is according to the electric quantity change of its own interfaces, and identification is shed to the splicing ear of above-mentioned earphone the splicing ear GND-M of oneself after earphone is inserted into earphone jack.In addition, output control part 5 controls are switched with the output of transistor (figure does not show) cut-out toward auxiliary woofer (SP-SW).
Thereupon, output on the earphone by above-mentioned switching part 4 from a preceding left side, the preceding right signal of above-mentioned power amplification portion 1 output, so the user can be by acoustic informations such as its earphone music appreciatings.
Afterwards, reason owing to the user, extract the words of earphone from above-mentioned earphone jack, the switch SW 1 of switching part 4, SW2 switch to original state, and the outgoing route toward above-mentioned auxiliary woofer (SP-SW) reconnects, so the user can be by left speaker SP-FL before above-mentioned and acoustic informations such as preceding right loud speaker SP-FR and auxiliary woofer (SP-SW) music appreciating.
As mentioned above, the present invention utilizes simple switching part, when earphone is inserted into earphone jack, the earphone that switches to of the audio signal physics of loud speaker before being sent to, so that the effect that can reduce product cost is greatly arranged.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (4)
1. channel audio signal commutation circuit, the audio output device for a plurality of channel audio signal of output is characterized in that comprising with lower member:,
First switching part only switches a part of channel audio output in above-mentioned a plurality of sound channel;
Second switching part except that switching above-mentioned a part of sound channel, at least also switches more than one channel audio output;
Output control part when above-mentioned second switching part is connected with earphone, is controlled above-mentioned first switching part and is cut off audio frequency output.
2. 2.1 channel audio signal commutation circuits as claimed in claim 1 is characterized in that described second switching part comprises a plurality of fixed terminals and movable terminal.
3. 2.1 channel audio signal commutation circuits as claimed in claim 2 is characterized in that the part of described fixed terminal and movable terminal is a splicing ear.
4. the described 2.1 channel audio signal commutation circuits of claim 1 when it is characterized in that described second switching part is connected with earphone, make the fixed terminal of described switching part be connected with the disconnected terminal of described movable terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114106 CN1282393C (en) | 2003-03-31 | 2003-03-31 | 2.1 sound channel audio frequency signal switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114106 CN1282393C (en) | 2003-03-31 | 2003-03-31 | 2.1 sound channel audio frequency signal switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1535074A true CN1535074A (en) | 2004-10-06 |
| CN1282393C CN1282393C (en) | 2006-10-25 |
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ID=34239329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03114106 Expired - Fee Related CN1282393C (en) | 2003-03-31 | 2003-03-31 | 2.1 sound channel audio frequency signal switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1282393C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103544958A (en) * | 2013-11-04 | 2014-01-29 | 深圳Tcl新技术有限公司 | Method and device for controlling voice-frequency howling during switching of voice-frequency output |
| CN110234052A (en) * | 2019-07-23 | 2019-09-13 | 深圳市美妙之音科技有限公司 | 2.1 sound channels hold public address microphone |
-
2003
- 2003-03-31 CN CN 03114106 patent/CN1282393C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103544958A (en) * | 2013-11-04 | 2014-01-29 | 深圳Tcl新技术有限公司 | Method and device for controlling voice-frequency howling during switching of voice-frequency output |
| CN103544958B (en) * | 2013-11-04 | 2018-02-27 | 深圳Tcl新技术有限公司 | Switch the method and apparatus for controlling Audio squealing during audio output |
| CN110234052A (en) * | 2019-07-23 | 2019-09-13 | 深圳市美妙之音科技有限公司 | 2.1 sound channels hold public address microphone |
| CN110234052B (en) * | 2019-07-23 | 2024-05-17 | 深圳市美妙之音科技有限公司 | 2.1 Sound track hand-held sound-amplifying microphone |
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| Publication number | Publication date |
|---|---|
| CN1282393C (en) | 2006-10-25 |
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Granted publication date: 20061025 |