CN201315646Y - Digital audio interface circuit for TV - Google Patents
Digital audio interface circuit for TV Download PDFInfo
- Publication number
- CN201315646Y CN201315646Y CNU2008202356237U CN200820235623U CN201315646Y CN 201315646 Y CN201315646 Y CN 201315646Y CN U2008202356237 U CNU2008202356237 U CN U2008202356237U CN 200820235623 U CN200820235623 U CN 200820235623U CN 201315646 Y CN201315646 Y CN 201315646Y
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- digital audio
- triode
- interface circuit
- audio interface
- circuit
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Abstract
The utility model discloses a digital audio interface circuit for a TV, which comprises a PNP triode, wherein the emitting electrode of the triode is connected with a power source via a resistor or the emitting electrode of the triode is connected with a signal output terminal via an output capacitor, the collecting electrode of the triode is grounded, and the base electrode of the triode is grounded via another resistor or the base electrode of the triode is connected with a signal input terminal via a resistor and a capacitor, which are connected in series. The digital audio interface circuit removes the D/A conversion procedure, and directly outputs digital signals from the SPDIF_OUT interface of the TV to a digital audio for the D/A conversion, so as to avoid the electromagnetic interference of a motherboard, and improve the acoustic quality. Additionally, the digital audio interface circuit has the advantages of isolating function and higher input impedance and lower output impedance, thereby overcoming the disadvantages of low output current and poor loading capability in a the digital signal decoder, reducing the bad influence of a back-end circuit on a front-end circuit, and improving the circuit loading capability and the front-end/back-end impedance matching.
Description
Technical field
The utility model relates to a kind of TV set circuit, especially relates to a kind of TV digital audio interface circuit.
Background technology
The birth of television set provides a kind of brand-new seeing and hearing enjoyment to people.At present television set is extending out, or during compatible other home appliances, has certain limitation, and audio system is easy to produce noise a little less than the antijamming capability on the transmission line is more common.Trace it to its cause is that the audio signal transmission of conventional television is carried out with analog form.Detailed process is that the voice signal in the TV is separated encoder through digital signal and carried out D/A conversion, and the digital signal of being made up of " 0 ", " 1 " is converted to the sound wave audio signal of simulation, outputs to loud speaker then, thereby is transferred in our ear.In this process, the loss reason owing to D/A converting unit, amplifier, loud speaker etc. itself causes the sound of this transmission perfectly not show, simultaneously, because there is certain electromagnetic radiation in TV SKD, can be subjected to electromagnetic interference, thereby cause sound quality deterioration.In addition, because present many digital televisions possess the USB function, many audio files of playing with USB, such as H.264 MP3 waits file, and their audio format all is 5.1 sound channels, if sound is reduced, can not get genuine seeing and hearing enjoyment according to traditional pattern at all.
The utility model content
The purpose of this utility model is to propose a kind of TV digital audio interface circuit, with problem such as solve above-mentioned D/A transition loss, be subjected to a little less than TV SKD Electromagnetic Interference and the transmission line antijamming capability.This interface circuit is changed without D/A, will by television set SPDIF_OUT interface, be transferred on the various external equipments with digital audio and video signals from the digital audio and video signals process isolation processing of TV.
For solving technical problem of the present utility model, the utility model discloses a kind of TV digital audio interface circuit, comprise: the PNP triode, this transistor emitter connects power supply through a resistance, this transistor emitter connects signal output part through an output capacitance, this transistor collector ground connection, this transistor base are through another grounding through resistance, and this transistor base connects signal input part through the resistance and the electric capacity of a series connection.
More excellent, be connected to an inductance between described output capacitance and the signal output part.Between described output capacitance and described inductance link and ground, be connected to a static suppressor.Described transistor emitter is through a grounding through resistance.Be connected to an electric capacity between described signal output part and the ground.
Compared with prior art, the utlity model has following beneficial effect:
Reduced the D/A conversion links, directly the SPDIF_OUT interface of digital signal from television set has been outputed to the digital sound, in digital sound, carried out D/A, avoided the electromagnetic interference of mainboard, thereby improved tonequality.This interface circuit has higher input impedance and lower output impedance simultaneously, it is little to remedy the digital signal decoder output current, the shortcoming of load capacity deficiency reduces the influence of late-class circuit to front stage circuits, thus the carrying load ability of intensifier circuit and front and back level impedance matching.
Description of drawings
Fig. 1 is the utility model preferred embodiment schematic diagram.
Embodiment
With reference to shown in Figure 1.The TV digital audio interface circuit comprises: PNP triode Q1, this transistor emitter connects power supply through a resistance R 4, this transistor emitter meets signal output part SPDIF_OUT through an output capacitance C2, this transistor collector ground connection, this transistor base is through another resistance R 3 ground connection, and this transistor base meets signal input part SPDIF_OUT_IN through the resistance R 1 and the capacitor C 1 of a series connection.Be connected to an inductance L 1 between output capacitance C2 and the signal output part SPDIF_OUT.Being connected to one between described output capacitance C2 and described inductance L 1 link and ground plays electrostatic protective function and has the static suppressor Z1 that good EMI, RFI suppress effect.Described transistor emitter is through resistance R 2 ground connection.Be connected to a capacitor C 3 between described signal output part SPDIF_OUT and the ground.
The SPDIF signal is by signal input part, the base stage that is added to the PNP triode through the capacitor C 1 and the resistance R 1 of series connection.When the SPDIF signal potential was high, triode ended, and VCC charges to C2 by R4; When the SPDIF signal potential hangs down, the triode conducting, C2 discharges over the ground by the triode of conducting.Signal output part SPDIF_OUT follows the logarithmic output signal word signal of signal input part SPDIF_OUT_IN.Be input in the sound equipment that possesses the SPDIF_IN interface by optical fiber or coaxial cable then sound is reduced.
The effect of this interface circuit mainly is a buffer action, avoids influencing each other of two ends! R1 wherein, R3 plays a dividing potential drop effect, adjusts the output amplitude of SPDIF signal.R2, R4 are parallel connection method in small-signal model, mainly are to carry out impedance matching, and the standard that requires of coaxial cable is 75ohm.C1, the effect of C2 be the coupling and every straight effect!
This interface circuit has reduced the D/A conversion links, directly the SPDIF_OUT interface of digital signal from television set is outputed to the digital sound, carries out D/A in digital sound, has avoided the electromagnetic interference of mainboard, thereby has improved tonequality.Allow the more powerful extended capability of TV set and the transmittability of high-fidelity.Thereby bring brand-new seeing and hearing enjoyment to the consumer!
Claims (5)
1, a kind of TV digital audio interface circuit, it is characterized in that this circuit comprises: the PNP triode, this transistor emitter connects power supply through a resistance, this transistor emitter connects signal output part through an output capacitance, this transistor collector ground connection, this transistor base is through another grounding through resistance, and this transistor base connects signal input part through the resistance and the electric capacity of a series connection.
2, TV digital audio interface circuit according to claim 1 is characterized in that: be connected to an inductance between described output capacitance and the signal output part.
3, TV digital audio interface circuit according to claim 2 is characterized in that: be connected to a static suppressor between described output capacitance and described inductance link and ground.
4, TV digital audio interface circuit according to claim 3 is characterized in that: described transistor emitter is through a grounding through resistance.
5, TV digital audio interface circuit according to claim 4 is characterized in that: be connected to an electric capacity between described signal output part and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202356237U CN201315646Y (en) | 2008-12-23 | 2008-12-23 | Digital audio interface circuit for TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202356237U CN201315646Y (en) | 2008-12-23 | 2008-12-23 | Digital audio interface circuit for TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201315646Y true CN201315646Y (en) | 2009-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202356237U Expired - Fee Related CN201315646Y (en) | 2008-12-23 | 2008-12-23 | Digital audio interface circuit for TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201315646Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354883A (en) * | 2011-06-15 | 2012-02-15 | 北京天地融科技有限公司 | Audio signal transfer device |
| CN103414068A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal switching device |
| CN107611951A (en) * | 2017-10-24 | 2018-01-19 | 深圳市博诺技术有限公司 | A kind of protection circuit of automobile bus communication line |
| CN108650438A (en) * | 2018-07-06 | 2018-10-12 | 深圳市鼎盛威电子有限公司 | Digital TV front-end host and digital signal converting system |
| CN109951176A (en) * | 2019-03-22 | 2019-06-28 | 晶晨半导体(上海)股份有限公司 | A kind of system and method for the acquisition capacity for detection waveform acquisition device |
| CN110085267A (en) * | 2019-04-23 | 2019-08-02 | 晶晨半导体(上海)股份有限公司 | A kind of adjusting circuit making up component variations |
-
2008
- 2008-12-23 CN CNU2008202356237U patent/CN201315646Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354883A (en) * | 2011-06-15 | 2012-02-15 | 北京天地融科技有限公司 | Audio signal transfer device |
| CN103414068A (en) * | 2011-06-15 | 2013-11-27 | 天地融科技股份有限公司 | Audio signal switching device |
| CN103414068B (en) * | 2011-06-15 | 2016-06-15 | 天地融科技股份有限公司 | A kind of audio signal switching device |
| CN107611951A (en) * | 2017-10-24 | 2018-01-19 | 深圳市博诺技术有限公司 | A kind of protection circuit of automobile bus communication line |
| CN107611951B (en) * | 2017-10-24 | 2020-04-07 | 深圳市博诺技术有限公司 | Protection circuit of automobile bus communication line |
| CN108650438A (en) * | 2018-07-06 | 2018-10-12 | 深圳市鼎盛威电子有限公司 | Digital TV front-end host and digital signal converting system |
| CN108650438B (en) * | 2018-07-06 | 2024-05-24 | 深圳市鼎盛威电子有限公司 | Digital television front-end host and digital signal conversion system |
| CN109951176A (en) * | 2019-03-22 | 2019-06-28 | 晶晨半导体(上海)股份有限公司 | A kind of system and method for the acquisition capacity for detection waveform acquisition device |
| CN109951176B (en) * | 2019-03-22 | 2023-03-28 | 晶晨半导体(上海)股份有限公司 | System and method for detecting acquisition capacity of waveform acquisition device |
| CN110085267A (en) * | 2019-04-23 | 2019-08-02 | 晶晨半导体(上海)股份有限公司 | A kind of adjusting circuit making up component variations |
| CN110085267B (en) * | 2019-04-23 | 2022-02-08 | 晶晨半导体(上海)股份有限公司 | Make up regulating circuit of device difference |
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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: 20090923 Termination date: 20151223 |
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| EXPY | Termination of patent right or utility model |