CN201750482U - Audio and video auxiliary input circuit for vehicular digital television receiving device - Google Patents
Audio and video auxiliary input circuit for vehicular digital television receiving device Download PDFInfo
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- CN201750482U CN201750482U CN2009201921588U CN200920192158U CN201750482U CN 201750482 U CN201750482 U CN 201750482U CN 2009201921588 U CN2009201921588 U CN 2009201921588U CN 200920192158 U CN200920192158 U CN 200920192158U CN 201750482 U CN201750482 U CN 201750482U
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Abstract
The utility model relates to an audio and video auxiliary input circuit for a vehicular digital television receiving device, comprising a direct current isolation module, a filtering network module, a differential amplifying module, a video decoding module and a controllable switch, wherein the direct current isolation module is used for filtering the direct signal of the input signal; the filtering network module is used for filtering the high-frequency and low-frequency signals, and only allowing the 20-20KHz signals to pass through; the differential amplifying module is used for amplifying the audio signals; the video decoding module is used for decoding the video signals into the output format; and the controllable switch can complete the signal switching between the vehicular digital television and the external audio and video playing equipment. The utility model can complete the switching between the digital television and the connected external audio and video playing equipment, so the use range of the digital television is greatly enhanced, and the receiver terminal of the digital television becomes a real multimedia terminal.
Description
(1) technical field
The utility model relates to a kind of auxiliary input circuit of audio frequency and video that is used for the vehicle-mounted digital television receiving system.
(2) background technology
Traditional Digital TV Receiver Box based does not generally have audio frequency and video to assist input port, generally all adopts integrated audio frequency and video to switch IC on other like product, and cost is higher; Some uses common electronic switch, and as the IC of CD4053 and so on, general separating degree is very poor, still has cross-talk when powered-down on the voice-grade channel, the more important thing is the audio input signal that can't carry higher level.
(3) utility model content
Technical problem to be solved in the utility model provides a kind of auxiliary input circuit of the audio frequency and video that are used for the vehicle-mounted digital television receiving system that promotes the scope of application of digital television receiver.
A kind of auxiliary input circuit of audio frequency and video that is used for the vehicle-mounted digital television receiving system, the auxiliary input circuit of described audio frequency and video comprises:
One direct current isolation module is used for removing by filter the direct current signal of input signal;
One filter network module is used for elimination low-and high-frequency signal and only allows the signal of 20～20KHz to pass through;
One differential amplification module is used for audio signal is amplified;
One video decode module is used for vision signal is decoded as exportable form;
One gate-controlled switch, the signal that is used to finish between vehicle-mounted digital television and the external playing audio/video switches;
Described DC-isolation module, filter network module, differential amplification module, video decode module connect in turn, and gate-controlled switch is connected with the video decode module with differential amplification module respectively.
Preferably, the bandwidth-limited circuit of described filter network module for being in series by high-pass filtering circuit and low-pass filter circuit.
Auxiliary sound of the present utility model is looked the characteristics that inlet circuit makes full use of the video a/d decoding chip, solved the problem that field blanking and audio-visual synchronization are switched, make each input channel of audio frequency and video separate, have good separating degree, simultaneously can be not influential when the audio input signal of higher level is arranged to circuit yet.Only need other the audio frequency and video output signal of stereo set correctly is connected to the auxiliary input of vehicle-mounted digital television receiving system during use, cooperate the signal source switching key on the remote controller then, can finish the switching between Digital Television and the playing audio/video that other is connected, so greatly promote the scope of application of digital television receiver, made the digital television receiver terminal become a multimedia terminal veritably.
(4) description of drawings
Fig. 1 is the theory diagram of the auxiliary input circuit of the described audio frequency and video of embodiment.
(5) embodiment
Below by embodiment the utility model is made preferably specific description, but protection range of the present utility model is not limited to this.
With reference to Fig. 1, a kind of auxiliary input circuit of audio frequency and video that is used for the vehicle-mounted digital television receiving system, the auxiliary input circuit of described audio frequency and video comprises:
One direct current isolation module is used for removing by filter the direct current signal of input signal;
One filter network module is used for elimination low-and high-frequency signal and only allows the signal of 20～20KHz to pass through;
One differential amplification module is used for audio signal is amplified;
One video decode module is used for vision signal is decoded as exportable form;
One gate-controlled switch, the signal that is used to finish between vehicle-mounted digital television and the external playing audio/video switches; Described DC-isolation module, filter network module, differential amplification module, video decode module connect in turn, and gate-controlled switch is connected with the video decode module with differential amplification module respectively.
During the utility model work, the signal that collects through the vehicle-mounted digital television receiving system removes by filter direct current interference signal in the input signal by the DC-isolation module, and then through the high low-pass filtering of filter network module, by differential amplification module audio signal is amplified the back output audio signal again, and by video decode module decoding back outputting video signal.When need were opened external stereo set, the signal that adopts gate-controlled switch to finish between vehicle-mounted digital television and the external playing audio/video switched.
Claims (2)
1. audio frequency and video that are used for the vehicle-mounted digital television receiving system are assisted input circuit, it is characterized in that:
The auxiliary input circuit of described audio frequency and video comprises:
One direct current isolation module is used for removing by filter the direct current signal of input signal;
One filter network module is used for elimination low-and high-frequency signal and only allows the signal of 20～20KHz to pass through;
One differential amplification module is used for audio signal is amplified;
One video decode module is used for vision signal is decoded as exportable form;
One gate-controlled switch, the signal that is used to finish between vehicle-mounted digital television and the external playing audio/video switches;
Described DC-isolation module, filter network module, differential amplification module, video decode module connect in turn, and gate-controlled switch is connected with the video decode module with differential amplification module respectively.
2. according to the auxiliary input circuit of the audio frequency and video that are used for the vehicle-mounted digital television receiving system of claim 1, it is characterized in that: the bandwidth-limited circuit of described filter network module for being in series by high-pass filtering circuit and low-pass filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201921588U CN201750482U (en) | 2009-08-31 | 2009-08-31 | Audio and video auxiliary input circuit for vehicular digital television receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201921588U CN201750482U (en) | 2009-08-31 | 2009-08-31 | Audio and video auxiliary input circuit for vehicular digital television receiving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201750482U true CN201750482U (en) | 2011-02-16 |
Family
ID=43585155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201921588U Expired - Fee Related CN201750482U (en) | 2009-08-31 | 2009-08-31 | Audio and video auxiliary input circuit for vehicular digital television receiving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201750482U (en) |
-
2009
- 2009-08-31 CN CN2009201921588U patent/CN201750482U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20150831 |
|
| EXPY | Termination of patent right or utility model |