CN2392316Y - Automatic muting device for video/audio equipment - Google Patents
Automatic muting device for video/audio equipment Download PDFInfo
- Publication number
- CN2392316Y CN2392316Y CN 99246561 CN99246561U CN2392316Y CN 2392316 Y CN2392316 Y CN 2392316Y CN 99246561 CN99246561 CN 99246561 CN 99246561 U CN99246561 U CN 99246561U CN 2392316 Y CN2392316 Y CN 2392316Y
- Authority
- CN
- China
- Prior art keywords
- optical coupler
- audio
- visual equipment
- video
- audio equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Circuit For Audible Band Transducer (AREA)
Abstract
The utility model relates to an automatic muting device for video/audio equipment which belongs to an automatic control device connected between a telephone line of a user and a volume control end of the video/audio equipment. The automatic control device comprises an optical coupler, two input terminals of the optical coupler are connected with the telephone line in series, a diode with reverse polarity is connected between the two input terminals of the optical coupler in parallel, and two output terminals of the optical coupler are connected with a volume control circuit of the video/audio equipment. When an automatic muting device for video/audio equipment is used, the volume of the video/audio equipment can be automatically lowered when a telephone bell sounds or the user telephones others; thus, the conversation is not hindered, and the volume can be automatically recovered after the conversation stops.
Description
The utility model relates to a kind of automatic control equipment between the volume control end of the telephone wire that is connected the user and audio-visual equipment.
Raising along with people's living standard, phone has not only been installed by the family of the overwhelming majority, but also television set, video disc player, sound equipment or power amplifier etc. have been purchased, what have also is provided with home theater, the sound that these audio-visual equipments send when normal the use is all very big, cause the ringing tone of can't hear when calling maybe can't converse, even hear the ringing tone of calling, for the ease of conversation, also have to the volume of audio-visual equipment is turned down, end of conversation is transferred the volume of audio-visual equipment greatly again, brings a lot of inconvenience to the user.
The purpose of this utility model provides a kind of automatic mute device at telephone rings or the audio-visual equipment that the volume of audio-visual equipment diminishes automatically when outwards making a phone call.
The automatic mute device of this audio-visual equipment comprises an optical coupler, two inputs of this optical coupler are connected on any single line in two telephone wires of user, the diode of an error-polarity connection in parallel between two inputs of this optical coupler, the control end of the volume control circuit in the collector output of this optical coupler and the audio-visual equipment is connected, and the earth terminal of the volume control circuit in the emitter output of optical coupler and the audio-visual equipment is connected.
As improvement to the automatic mute device of this audio-visual equipment, the current-limiting resistance of connecting between the control end of the volume control circuit in the collector output of optical coupler and audio-visual equipment.
The automatic mute device of this audio-visual equipment, can independently place, also can be placed in the terminal box of subscriber phone, can also be placed on audio-visual equipment inside, by corresponding connecting line, the automatic mute device of this audio-visual equipment is connected with acoustic image equipment with subscriber's telephone line.
When phone ringing, carry machine by number and communication process in, there is electric current to pass through in the telephone line, this electric current makes optical coupler become conducting state by ending, the output impedance of optical coupler by very big become very little, this very little output impedance is connected in parallel between the control end and earth terminal of volume control circuit, it is very big that the volume control voltage of audio-visual equipment is changed, make the loud speaker of terminal almost can not send out sound or the sound that sends very faint.End of conversation, no current passes through in the telephone line, and optical coupler is become by conducting and ends, and it is normal that the sound of audio-visual equipment recovers again.With the effect of optical coupler input diode connected in parallel be telephone signal normal delivery when guaranteeing ring and conversation, sound is undistorted.
From the above mentioned, the automatic mute device of this audio-visual equipment not only when phone ringing and conversation the sound of the audio-visual equipment of starting shooting is diminished automatically, and structure is simple especially, and installation and use are all very convenient.
Accompanying drawing shows the embodiment of the automatic mute device of audio-visual equipment, wherein Fig. 1 is the circuit structure schematic diagram of the automatic mute device of audio-visual equipment, Fig. 2 is placed on schematic diagram in the audio-visual equipment with this automatic mute device, Fig. 3 is placed on schematic diagram in the subscriber phone terminal box with this automatic mute device, Fig. 4 is that the volume control circuit of audio-visual equipment adopts the negative control mode (it is high more promptly to control voltage, output sound is more little) time, the circuit connection diagram of this automatic mute device and audio-visual equipment.
In the present embodiment, the automatic mute device of audio-visual equipment comprises an optical coupler V
2, this optical coupler V
2Two input a, b be connected on any single line among two interphone line M, the N of subsets 1 this optical coupler V
2Two inputs (a, b) between the diode V of an error-polarity connection in parallel
1, this optical coupler V
2Current-limiting resistance R of output C series connection
1The back is connected R with the control end e of volume control circuit 3 in the audio-visual equipment 2
1Resistance be generally 100-200 Ω, optical coupler V
2Another output d and audio-visual equipment 2 in the earth terminal f of volume control circuit be connected.X among Fig. 1, Fig. 2, Fig. 3 and Fig. 4
1, X
2Be the binding post on audio-visual equipment 2 shells, the label 4 among Fig. 2 and Fig. 3 is the subscriber phone terminal box.Fig. 4 is as special case, optical coupler V
2Current-limiting resistance R of output series connection
1The back is connected optical coupler V with the positive power source terminal of volume control circuit 3 in the audio-visual equipment 2
2Another output d be connected with volume control end e in the audio-visual equipment 2.
Claims (2)
1, a kind of automatic mute device of audio-visual equipment is characterized in that comprising an optical coupler (V
2), this optical coupler (V
2) two inputs (a, b) be connected on any single line in two telephone wires of user (M, N) this optical coupler (V
2) two inputs (a, b) between the diode (V of an error-polarity connection in parallel
1), this optical coupler (V
2) collector output (c) and audio-visual equipment (2) in the control end (e) of volume control circuit (3) be connected optical coupler (V
2) emitter output (d) and audio-visual equipment (2) in the earth terminal (f) of volume control circuit be connected.
2, the automatic mute device of audio-visual equipment according to claim 1 is characterized in that at optical coupler (V
2) collector output (c) and audio-visual equipment (2) in the control end (e) of volume control circuit (3) between the current-limiting resistance (R that connects
1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99246561 CN2392316Y (en) | 1999-09-24 | 1999-09-24 | Automatic muting device for video/audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99246561 CN2392316Y (en) | 1999-09-24 | 1999-09-24 | Automatic muting device for video/audio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2392316Y true CN2392316Y (en) | 2000-08-16 |
Family
ID=34032158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99246561 Expired - Fee Related CN2392316Y (en) | 1999-09-24 | 1999-09-24 | Automatic muting device for video/audio equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2392316Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399889B (en) * | 2007-09-27 | 2015-03-25 | 联想(北京)有限公司 | Method and device for mute processing to audible device |
-
1999
- 1999-09-24 CN CN 99246561 patent/CN2392316Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399889B (en) * | 2007-09-27 | 2015-03-25 | 联想(北京)有限公司 | Method and device for mute processing to audible device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |