CN201937750U - Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine - Google Patents
Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine Download PDFInfo
- Publication number
- CN201937750U CN201937750U CN2011200606634U CN201120060663U CN201937750U CN 201937750 U CN201937750 U CN 201937750U CN 2011200606634 U CN2011200606634 U CN 2011200606634U CN 201120060663 U CN201120060663 U CN 201120060663U CN 201937750 U CN201937750 U CN 201937750U
- Authority
- CN
- China
- Prior art keywords
- digital
- digital audio
- passage
- channel
- output
- 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
Images
Landscapes
- Television Receiver Circuits (AREA)
Abstract
The utility model discloses an audio channel switching circuit of a digital television all-in-one machine and the digital television all-in-one machine. The digital television all-in-one machine comprises an audio television (ATV) channel and a digital television (DTV) channel, wherein digital audio signals of the ATC channel and digital audio signals of the DTV channel are transmitted to a switch circuit for carrying out gating switching, the switch circuit outputs a path of selected digital audio signals to a digital audio output interface of a television, and the control end of the digital audio output interface receives channel selection signals output by a main chip of the television. Through the design of an audio channel switching circuit on the ATV channel and the DTV channel on the all-in-one machine, the digital audio signals from the ATV channel and the DTV channel can be output through the digital audio output interface of the television, so the program accompanying sound can be played and output through an external power amplifier no matter whether users select to receive the audio and video program of the ATV channel or to receive cable television signals through the DTV interface, and the television receiving requirement of the users is sufficiently met.
Description
Technical field
The utility model belongs to the digital TV integrated machine technical field, specifically, relate to a kind of digital TV integrated machine that the multipath audio signal of digital TV integrated machine is selected the channel switching circuit that switches and adopted the design of described voice-grade channel commutation circuit of being used for.
Background technology
So-called " digital TV integrated machine ", the television set that has the receiving digital signals function exactly, it combines digital received, decoding and demonstration together, therefore, when receiving digital television signal, no longer needs external set-top box.Present set-top box, being exactly one in fact is the transducer of common audio-video signal with digital demodulation signal.Digital TV integrated machine then is that the partial function with set-top box has been incorporated in the television set, has increased tuner for digital signals in fact exactly in conventional television, can directly receive the decode the digital television program source.The design that adds set-top box with simulated television is compared, and digital TV integrated machine integrated level height can be realized omnidistance digitlization, is ideal rating mode, has represented the developing direction of following Digital Television.Therefore simultaneously,, avoided mixed and disorderly wiring, and had the space of saving, advantage such as easy to use owing to realized complete built-inly.
In present digital TV integrated machine product, generally all be provided with ATV passage (being the anolog TV signals passages) and DTV passage (digital television signal passage).Wherein, the analog audio-video signal by ATV interface input is isolated audio signal and vision signal behind demodulator and decoder processes through television set inside, transfer to audio plate and display panel respectively, realizes that the sound accompaniment output of TV programme and picture show.In the ATV passage, transfer to the digital audio output interface SPDIF-OUT of television set simultaneously by the digital audio and video signals of decoder output, when being plugged with external power amplifying device on the SPDIF-OUT interface, the TV programme sound accompaniment just can be play output by external power amplifier.And for the digital television signal by the input of DTV passage, then behind demodulator and decoder processes through television set inside, isolated digital audio and video signals can only be play output by the built-in power amplifier of television set.Therefore, when the user uses the DTV interface to connect wired television signal line, can't play the TV programme sound accompaniment by external power amplifier.
The utility model content
The purpose of this utility model is to provide a kind of voice-grade channel commutation circuit of digital TV integrated machine, realizes the selection switching output function to the digital audio and video signals of ATV passage and DTV passage.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of voice-grade channel commutation circuit of digital TV integrated machine, comprise ATV passage and DTV passage, the digital audio and video signals of the digital audio and video signals of described ATV passage and DTV passage transfers to a switching circuit and carries out the gating switching, the way word audio signal transmission that described switching circuit output is chosen is to the digital audio output interface of television set, and the control end of described switching circuit receives the channel selecting signal of television set master chip output.
Further, in described switching circuit, include a binary channels switching device, the corresponding respectively two-way digital audio and video signals that receives described ATV passage and the output of DTV passage of the two-way gating end of described switching device, common port connects the digital audio output interface of television set, and control end receives described channel selecting signal.
Preferably, described switching device is a single-pole double throw analog switch.
Further again, in described switching circuit, also include a negative circuit, connect described television set master chip, receive the channel selecting signal of master chip output, and after carrying out anti-phase processing, export the control end of described switching device to.
Further, include a NPN type triode in described negative circuit, the base stage of described triode connects master chip, receives the channel selecting signal of master chip output, grounded emitter, collector electrode are connected with the control end of DC power supply and described switching device respectively.
Based on above-mentioned voice-grade channel commutation circuit structure, the utility model provides a kind of digital TV integrated machine that adopts described voice-grade channel commutation circuit design again, comprises ATV passage, DTV passage, master chip and digital audio output interface; Between described digital audio output interface and ATV passage, DTV passage, a switching circuit is set, to transfer to described switching circuit by the two-way digital audio and video signals of described ATV passage and the output of DTV passage and carry out the gating switching, and then a way word audio signal transmission of choosing by the output of described switching circuit is to described digital audio output interface, thereby realized the external output function of the digital audio and video signals of ATV passage and DTV passage; Wherein, the control end of described switching circuit receives the channel selecting signal of master chip output, to determine switching channel.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by design voice-grade channel commutation circuit on the ATV of digital TV integrated machine passage and DTV passage, thereby can export digital audio and video signals respectively by the digital audio output interface of television set from ATV passage and DTV passage, no matter the user selects to use the ATV interface thus still is that the DTV interface receives cable TV signal, the program sound accompaniment can be play output by power amplifying devices such as external voice boxes, fully satisfy user's rating demand.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the voice-grade channel commutation circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
SPDIF is the abbreviation of SONY, PHILIPS digital audio interface, can transmit PCM stream and this class surround sound compressing audio signal of Dolby Digital, DTS.With regard to transmission means, SPDIF is divided into digital audio output SPDIF-OUT and digital audio is imported two kinds of SPDIF-IN.On present digital TV integrated machine, generally all be provided with digital audio output interface SPDIF-OUT, be used to the external digital multimedia loudspeaker box of pegging graft.After as the user digital audio amplifier being connected on the SPDIF-OUT interface of television set, digital audio and video signals by television set master chip decoding output can directly transfer to digital audio amplifier, utilize the treatment circuit in the digital audio amplifier to carry out the D/A conversion, and then digital audio and video signals is converted into the current signal that the simulation sound wave changes, drive loud speaker output.Because digital audio and video signals need not to handle through the sound effect circuit of television internal, therefore, can avoid its interference that suffers tv chassis internal electrical magnetic wave, thereby make tonequality be purified, the output audio is perfect more.
Present embodiment at present digital TV integrated machine when using its DTV interface to connect wired television signal line, can only play the problem of TV programme sound accompaniment by the built-in speaker of television set, a kind of voice-grade channel commutation circuit has been proposed, promptly by on the digital audio output interface SPDIF-OUT of digital TV integrated machine, connecting a switching circuit, and then utilize this switching circuit to selecting to switch from the digital audio and video signals of ATV passage with from the digital audio and video signals of DTV passage, thereby no matter the user selects to use the ATV interface of television set still is that the DTV interface receives cable TV signal, can be by controlling the SPDIF-OUT interface that described switching circuit transfers to the digital audio and video signals of its passage television set, and then export power amplifying devices such as outside audio amplifier to by described SPDIF-OUT interface, realize the external power amplifier output function of program sound accompaniment (particularly digital television program sound accompaniment).
As a kind of preferred design, preferably adopt a binary channels switching device to design described switching circuit in the present embodiment, such as a single-pole double throw analog switch N26, as shown in Figure 1.Two-way gating end NO with single-pole double throw analog switch N26, NC respectively with television set in the ATV passage be connected with the DTV passage is corresponding, utilize gating end NO to receive the digital audio and video signals SPDIF_ATV of ATV passage, utilize gating end NC to receive the digital audio and video signals SPDIF_DTV of DTV passage, and the common port COM of single-pole double throw analog switch N26 is connected on the digital audio output interface SPDIF-OUT of television set, control end IN receives the channel selecting signal IN_L/H of television set master chip output, under the control action of master chip, can realize two-way digital audio and video signals SPDIF_ATV thus, the switching output function of SPDIF_DTV.
In order to make waveform stabilization by the channel selecting signal IN_L/H of master chip output, and the high-low level amplitude can satisfy the port definition requirement of single-pole double throw analog switch N26, present embodiment has also designed negative circuit between the control end IN of single-pole double throw analog switch N26 and master chip, as shown in Figure 1, can specifically adopt a NPN type triode V18 to cooperate simple periphery circuit design to realize, be used for the channel selecting signal IN_L/H of master chip output is carried out anti-phase processing, thus stable switching of control single-pole double throw analog switch N26.Specifically, the base stage of NPN type triode V18 can be connected the television set master chip by resistance R 393,, receive the channel selecting signal of master chip output such as wherein one road GPIO mouth of master chip; With the grounded emitter of triode V18, collector electrode connects DC power supply 5V-IF by resistance R 126, and connects the control end IN of single-pole double throw analog switch N26 by resistance R 125.Described DC power supply 5V-IF connects the feeder ear V+ of single-pole double throw analog switch N26 simultaneously, and N26 provides working power for the single-pole double throw analog switch.
When the user uses the ATV interface to receive audio-video signal, the channel selecting signal of master chip output low level, make NPN type triode V18 be in cut-off state, at this moment, DC power supply 5V-IF exports high level by resistance R 126, R125 to the control end IN of single-pole double throw analog switch N26, promptly the channel selecting signal to master chip output carries out anti-phase processing, the common port COM of control single-pole double throw analog switch N26 is communicated with its gating end NO, and then the digital audio and video signals SPDIF_ATV of ATV passage is transferred to the digital audio output interface SPDIF-OUT of television set.When the user is plugged into external power amplifier on the SPDIF-OUT interface of television set, can be by the sound accompaniment of external power amplifier output TV programme.In like manner, when the user connects wired television signal line by the DTV interface, when receiving the digital television signal that TV station sends, the channel selecting signal of master chip output high level, control NPN type triode V18 is in saturation conduction, export the low level signal after the anti-phase processing, put the control end IN of single-pole double throw analog switch N26 low, at this moment, single-pole double throw analog switch N26 selects its common port COM is communicated with gating end NC, and then the digital audio and video signals SPDIF_DTV of DTV passage is transferred to the SPDIF-OUT interface of television set.When being plugged with external power amplifying device on the SPDIF-OUT interface, can be via the digital audio and video signals of external power amplifier output DTV passage, so that the audio frequency effect of high-quality to be provided to the user.
Certainly, described switching circuit also can adopt other switch elements with passage handoff functionality or discrete circuit design to realize that present embodiment is not limited in above giving an example.
Use the digital TV integrated machine of present embodiment, no matter the user selects the ATV passage for use still be the DTV passage, the program sound accompaniment can be exported by digital power amplifier device plays such as external voice boxes, thereby satisfy user's rating demand.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. the voice-grade channel commutation circuit of a digital TV integrated machine, comprise ATV passage and DTV passage, it is characterized in that: the digital audio and video signals of the digital audio and video signals of described ATV passage and DTV passage transfers to a switching circuit and carries out the gating switching, the way word audio signal transmission that described switching circuit output is chosen is to the digital audio output interface of television set, and the control end of described switching circuit receives the channel selecting signal of television set master chip output.
2. voice-grade channel commutation circuit according to claim 1, it is characterized in that: in described switching circuit, include a binary channels switching device, the corresponding respectively two-way digital audio and video signals that receives described ATV passage and the output of DTV passage of the two-way gating end of described switching device, common port connects the digital audio output interface of television set, and control end receives described channel selecting signal.
3. voice-grade channel commutation circuit according to claim 2 is characterized in that: described switching device is a single-pole double throw analog switch.
4. according to claim 2 or 3 described voice-grade channel commutation circuits, it is characterized in that: in described switching circuit, also include a negative circuit, connect described television set master chip, receive the channel selecting signal of master chip output, and after carrying out anti-phase processing, export the control end of described switching device to.
5. voice-grade channel commutation circuit according to claim 4, it is characterized in that: in described negative circuit, include a NPN type triode, the base stage of described triode connects master chip, receive the channel selecting signal of master chip output, grounded emitter, collector electrode are connected with the control end of DC power supply and described switching device respectively.
6. digital TV integrated machine, comprise ATV passage, DTV passage, master chip and digital audio output interface, it is characterized in that: the digital audio and video signals of the digital audio and video signals of described ATV passage and DTV passage transfers to a switching circuit and carries out the gating switching, the way word audio signal transmission that described switching circuit output is chosen is to described digital audio output interface, and the control end of described switching circuit receives the channel selecting signal of master chip output.
7. digital TV integrated machine according to claim 6, it is characterized in that: in described switching circuit, include a binary channels switching device, the corresponding respectively two-way digital audio and video signals that receives described ATV passage and the output of DTV passage of the two-way gating end of described switching device, common port connects described digital audio output interface, and control end receives described channel selecting signal.
8. digital TV integrated machine according to claim 7 is characterized in that: described switching device is a single-pole double throw analog switch.
9. according to claim 7 or 8 described digital TV integrated machines, it is characterized in that: in described switching circuit, also include a negative circuit, connect described master chip, receive the channel selecting signal of master chip output, and after carrying out anti-phase processing, export the control end of described switching device to.
10. digital TV integrated machine according to claim 9, it is characterized in that: in described negative circuit, include a NPN type triode, the base stage of described triode connects master chip, receive the channel selecting signal of master chip output, grounded emitter, collector electrode are connected with the control end of DC power supply and described switching device respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200606634U CN201937750U (en) | 2011-03-04 | 2011-03-04 | Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200606634U CN201937750U (en) | 2011-03-04 | 2011-03-04 | Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937750U true CN201937750U (en) | 2011-08-17 |
Family
ID=44449253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200606634U Expired - Fee Related CN201937750U (en) | 2011-03-04 | 2011-03-04 | Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201937750U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747328A (en) * | 2013-12-23 | 2014-04-23 | 乐视致新电子科技（天津）有限公司 | Television system, boot advertising audio frequency playback device and method |
| CN113873394A (en) * | 2021-10-25 | 2021-12-31 | 惠州视维新技术有限公司 | Television and audio control method |
-
2011
- 2011-03-04 CN CN2011200606634U patent/CN201937750U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747328A (en) * | 2013-12-23 | 2014-04-23 | 乐视致新电子科技（天津）有限公司 | Television system, boot advertising audio frequency playback device and method |
| CN113873394A (en) * | 2021-10-25 | 2021-12-31 | 惠州视维新技术有限公司 | Television and audio control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102568513B (en) | Audio data processing method and interacting method | |
| CN102970633A (en) | Device control apparatus, device control method, and program | |
| CN201937750U (en) | Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine | |
| CN205142478U (en) | Multi -functional power amplifier system | |
| CN207731651U (en) | A kind of automobile audio HDMI ARC circuits | |
| CN202889542U (en) | Set top box with audio output function | |
| CN208489969U (en) | Internet of Things sound integral machine | |
| CN208581320U (en) | A kind of TV set-top box with speaker | |
| CN102982818B (en) | System and method which are capable of achieving player audio return | |
| CN201156782Y (en) | Television set | |
| CN201608868U (en) | Music center | |
| CN205081902U (en) | Multichannel numeral home theater system of decoding | |
| CN201893863U (en) | Multipath audio-video signal switching device | |
| CN203813947U (en) | Intelligent multi-channel surround sound equipment | |
| CN201039318Y (en) | TV set with wired transmission and radio transmission function | |
| CN203870973U (en) | Integrated intelligent high efficiency digital multimedia playing system | |
| CN201986051U (en) | Television with audio/video output function | |
| CN2669532Y (en) | Television receiver with wireless audio box | |
| CN202855300U (en) | Multifunctional player | |
| CN201674467U (en) | Power amplifier device | |
| CN214544789U (en) | Power amplifier all-in-one machine with network audio-video playing function | |
| CN201138860Y (en) | Multifunctional integrated household video-audio playing system | |
| CN201054664Y (en) | Improved novel TV receiving system | |
| JP3115592U (en) | Multi-channel wireless transmission player | |
| CN201290133Y (en) | Multimedia play system and multimedia interface base frame |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20190304 |