CN204721468U - Audio return signal output apparatus and audio return system - Google Patents
Audio return signal output apparatus and audio return system Download PDFInfo
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- CN204721468U CN204721468U CN201520444703.3U CN201520444703U CN204721468U CN 204721468 U CN204721468 U CN 204721468U CN 201520444703 U CN201520444703 U CN 201520444703U CN 204721468 U CN204721468 U CN 204721468U
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Abstract
The utility model embodiment discloses a kind of audio return signal output apparatus, comprises main control chip and output control circuit; Described main control chip has return path signal output; Described output control circuit has test side and control end; Described return path signal output is connected with described control end.Meanwhile, the utility model embodiment also discloses a kind of audio return system, comprises the first equipment and the second equipment; Described first equipment comprises above-mentioned audio return signal output apparatus; Described second equipment has return path signal receiving terminal, and the return path signal output of described audio return signal output apparatus is connected with described return path signal receiving terminal by HDMI wire.The audio return signal output apparatus of the utility model embodiment achieves the function of audio return certification by hardware circuit, decrease the complexity of software of main control chip; Audio return system has the audio return function that hardware controls audio return signal exports, and system is simple and easy to realize.
Description
Technical field
The utility model relates to electronic technology field, is specifically related to a kind of audio return signal output apparatus and audio return system.
Background technology
Along with the progressively universal of Digital Television and multimedia video equipment with promote, user is growing for the demand digital high-definition content of multimedia video equipment be presented in HDTV (High-Definition Television) whenever and wherever possible, HDMI (High Definition Multimedia Interface, HDMI (High Definition Multimedia Interface)) technology arises at the historic moment, HDMI is a kind of digitized video/audio interface technology, be the tailored version digital interface of applicable image transmission, it can transmit audio frequency and signal of video signal simultaneously.Audio return (Audio Return Channel, ARC) be the function that 1.4 versions of HDMI define, it can make HDMI receiving equipment by audio return to the HDMI output equipment of previous stage, and this HDMI output equipment returns the audio frequency of coming to HDMI receiving equipment and processes.
HDMI receiving equipment needs to carry out the control exported audio return before carrying out audio return, 1.4 versions of HDMI to the requirement that audio return exports are, HDMI receiving equipment only could return audio signal to HDMI output equipment when there being HDMI signal to input, object is in order to avoid in the idle situation of audio return passage when HDMI output equipment, HDMI receiving equipment outputting digital audio signal, cause signal reflex thus cause the problems such as EMI (Electromagnetic Interference, electromagnetic interference).
Usually, in order to realize the control that audio return exports, the main control chip of the HDMI port of HDMI receiving equipment can distribute GPIO (General Purpose Input Output, universal input exports) mouth is to the power end of HDMI port, power end is the optional function of HDMI, when HDMI receiving equipment is connected with HDMI output equipment by HDMI wire, power end then can receive a high level, GPIO mouth detects power end, and then main control chip software exports according to the audio return of the level height situation control HDMI port of GPIO mouth.If GPIO mouth is high level, then audio return exports and opens; If GPIO mouth is low level, then audio return exports and closes.
The control program that the audio return that prior art provides exports, need the GPIO mouth taking main control chip, and need the low and high level of the software of main control chip to power end to detect, this also increases the complexity of software of main control chip while taking main control chip port resource.
Utility model content
The purpose of this utility model is, provides a kind of audio return signal output apparatus and audio return system, the control exported by hardware implementing audio return, thus reduces the complexity of main control chip software, saves main control chip port resource.
For solving above technical problem, the utility model embodiment provides a kind of audio return signal output apparatus, comprises main control chip and output control circuit; Described main control chip has return path signal output; Described output control circuit has test side and control end; Described return path signal output is connected with described control end.
Further, described output control circuit comprises the first resistance, the second resistance, the 3rd resistance, the first switching tube and second switch pipe; The first end of described first resistance is the test side of described output control circuit, and the second end is connected to the first end of described first switching tube; Second end of described first switching tube is connected with the first end of described second switch pipe by described second resistance; The first end of described 3rd resistance is connected to the first triode and the second resistance joint, and the second end is connected with DC power supply; 3rd end ground connection of described first triode; 3rd end ground connection of described second triode; Described second triode second end is the control end of described output control circuit.
Further, described first switching tube is triode or field effect transistor, is preferably NPN type triode or N channel field-effect pipe.Particularly, the grid of the base stage of the first end of described first switching tube, the second end and the 3rd end and described NPN type triode, collector and emitter or described N channel field-effect pipe, drain electrode and source electrode are corresponding.
Further, described second switch pipe is triode or field effect transistor, is preferably NPN type triode or N channel field-effect pipe.Particularly, the grid of the base stage of the first end of described second switch pipe, the second end and the 3rd end and described NPN type triode, collector and emitter or described N channel field-effect pipe, drain electrode and source electrode are corresponding.
Meanwhile, the utility model also provides a kind of audio return system, comprises the first equipment and the second equipment; Described first equipment comprises above-described audio return signal output apparatus; Described second equipment has return path signal receiving terminal, and the return path signal output of described audio return signal output apparatus is connected with described return path signal receiving terminal by HDMI wire.
Further, described first equipment also comprises the first HDMI; Described second equipment also comprises the second HDMI; Described first HDMI is connected by described HDMI wire with described second HDMI; Described HDMI wire has ARC passage; Described return path signal output is connected to described return path signal receiving terminal by the ARC passage in described first HDMI, described HDMI wire, described second HDMI successively; Described test side is connected with the power end in described first HDMI.Described power end is the optional function of described first HDMI 12
Further, described HDMI wire is the HDMI wire of 1.4 editions.
Further, described first equipment is television set; Described second equipment is power amplifier or DVD player.
The audio return signal output apparatus that the utility model embodiment provides, by the detection of output control circuit to test side low and high level, control the output of the audio return output of main control chip, namely from hardware, namely realize the output that can control audio return output, reduce the complexity of main control chip software, save main control chip port resource.Meanwhile, the utility model also provides a kind of audio return system, comprises the first equipment and the second equipment, and described first equipment comprises above-described audio return signal output apparatus.Described audio return system has the audio return function that hardware controls audio return signal exports, and system is simple and easy to realize.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of audio return system of the utility model embodiment;
Fig. 2 is the structural representation of the audio return signal output apparatus of the utility model embodiment;
Fig. 3 is the circuit diagram of the execution mode one of output control circuit in Fig. 2;
Fig. 4 is the circuit diagram of the execution mode two of output control circuit in Fig. 2;
Fig. 5 is the circuit diagram of the execution mode three of output control circuit in Fig. 2;
Fig. 6 is the circuit diagram of the execution mode four of output control circuit in Fig. 2.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Be the structural representation of a kind of audio return system of the new embodiment of this practicality see Fig. 1 and Fig. 2, Fig. 1, Fig. 2 is the structural representation of the audio return signal output apparatus of the utility model embodiment.
Described audio return system comprises the first equipment 10 and the second equipment 20; Described first equipment 10 comprises audio return signal output apparatus 11; Described second equipment 20 has return path signal receiving terminal;
Described audio return signal output apparatus 11 comprises main control chip 111 and output control circuit 112; Described main control chip 111 has return path signal output; Described output control circuit 112 has test side and control end; Described return path signal output is connected with described control end.
The return path signal output of described audio return signal output apparatus 11 is connected with described return path signal receiving terminal by HDMI wire 30.
Further, described first equipment 10 also comprises the first HDMI 12; Described second equipment also comprises the second HDMI 21; Described first HDMI 12 is connected by described HDMI wire 30 with described second HDMI 21; Described HDMI wire 30 has ARC passage, as shown in Figure 1, described HDMI wire 30 is that single line has multiple passage, and some straight lines in figure just show that described HDMI wire has multiple passage, and rest channels is for transmitting HDMI signal, control signal and 5V power supply signal etc.; Described return path signal output is connected to described return path signal receiving terminal by the ARC passage in described first HDMI 12, described HDMI wire 30, described second HDMI 21 successively; Described test side is connected with the power end in described first HDMI 12.
Wherein, power end is the optional function of described first HDMI 12.Described second equipment 20 transmits HDMI signal to described first equipment 10 by described HDMI wire 30, meanwhile, the high level that described second equipment 20 exports a 5V is transferred to the power end of described first HDMI 12 by described second HDMI 21 and HDMI wire 30.
Preferably, described first equipment 10 is television set; Described second equipment 20 is power amplifier or DVD player.
Preferably, described HDMI wire 30 is the HDMI wire of 1.4 editions.
Further, described first equipment 10 also comprises electric capacity C1, and described return path signal output is connected with described first HDMI 12 by described electric capacity C1.Due to, described return path signal output is connected with described control end, therefore, when specifically implementing, described control end can be connected to the junction of described return path signal output and described electric capacity C1, or is connected to the junction of described electric capacity C1 and described first HDMI 12.
Further, described output control circuit 112 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first switching tube Q1 and second switch pipe Q2; The first end of described first resistance R1 is the test side of described output control circuit 112, and the second end is connected to the first end of described first switching tube Q1; Second end of described first switching tube Q1 is connected with the first end of described second switch pipe Q2 by described second resistance R2; The first end of described 3rd resistance R3 is connected to the first switching tube Q1 and the second resistance R2 junction, and the second end is connected with DC power supply; The 3rd end ground connection of described first switching tube Q1; The 3rd end ground connection of described second switch pipe Q2; Described second switch pipe Q2 second end is the control end of described output control circuit 112.In the present embodiment, described DC power supply is+5V.
Further, described first switching tube Q1 is triode or field effect transistor, is preferably NPN type triode or N channel field-effect pipe.
Further, described second switch pipe Q2 is triode or field effect transistor, is preferably NPN type triode or N channel field-effect pipe.
Refer to Fig. 3, it is the circuit diagram of the execution mode one of output control circuit in Fig. 2.In Fig. 3, the first switching tube Q1 of output control circuit and second switch pipe Q2 is NPN type triode.Base stage, the collector and emitter of the first end of described first switching tube Q1, the second end and the 3rd end and described NPN type triode are corresponding; Base stage, the collector and emitter of the first end of described second switch pipe Q2, the second end and the 3rd end and described NPN type triode are corresponding.
Refer to Fig. 4, it is the circuit diagram of the execution mode two of output control circuit in Fig. 2.In Fig. 4, the first switching tube Q1 of output control circuit and second switch pipe Q2 is N channel field-effect pipe.The grid of the first end of described first switching tube Q1, the second end and the 3rd end and N channel field-effect pipe, drain electrode and source electrode are corresponding; The grid of the first end of described second switch pipe Q2, the second end and the 3rd end and N channel field-effect pipe, drain electrode and source electrode are corresponding.
Refer to Fig. 5, it is the circuit diagram of the execution mode three of output control circuit in Fig. 2.In Fig. 5, the first switching tube Q1 of output control circuit is NPN type triode, and second switch pipe Q2 is N channel field-effect pipe.Base stage, the collector and emitter of the first end of described first switching tube Q1, the second end and the 3rd end and described NPN type triode are corresponding; The grid of the first end of described second switch pipe Q2, the second end and the 3rd end and N channel field-effect pipe, drain electrode and source electrode are corresponding.
Refer to Fig. 6, it is the circuit diagram of the execution mode four of output control circuit in Fig. 2.In Fig. 6, the first switching tube Q1 of output control circuit is N channel field-effect pipe, and second switch pipe Q2 is NPN type triode.The grid of the first end of described first switching tube Q1, the second end and the 3rd end and N channel field-effect pipe, drain electrode and source electrode are corresponding; Base stage, the collector and emitter of the first end of described second switch pipe Q2, the second end and the 3rd end and described NPN type triode are corresponding.
Below by with the first equipment of the utility model embodiment for television set, second equipment is DVD player, the operation principle of description audio passback output circuit and audio return system: during described audio return system works, the two ends of described HDMI wire 30 are plugged on the HDMI of described television set and described DVD player respectively, described DVD player exports HDMI signal to described television set by described HDMI wire 30, simultaneously, described DVD player also exports a 5V signal is transferred to the HDMI of described television set power end by described second HDMI and described HDMI wire, the test side of the output control circuit 112 of described television set will detect the high level signal of a 5V.Described high level signal provides bias current or bias voltage to described first switching tube Q1 through described first resistance R1, make described first switching tube Q1 conducting, described DC power supply be thus diverted to the voltage of described second resistance R2 or electric current too small, described second switch pipe Q2 ends, the audio return signal that then described main control chip 111 exports passes through described electric capacity C1 successively, described first HDMI 12, the ARC passage of described HDMI wire 30, described second HDMI 21 passes back to described return path signal receiving terminal, namely described television set gives described DVD player by described HDMI wire passback audio signal.When described HDMI wire 30 disconnects the connection of described television set and described DVD player, the power end of described first HDMI 12 will not have signal, be low level, described first resistance R1 cannot provide bias current or voltage to described first switching tube Q1, described first switching tube Q1 ends, thus described DC power supply is diverted to the voltage of described second resistance R2 or electric current makes described second switch pipe Q2 conducting, the audio return Signal transmissions that then described main control chip 111 exports goes out to described second switch pipe Q2, thus described first HDMI 12 does not have audio return signal to export, namely described television set exports without passback audio signal.
Compared to existing technology, the beneficial effect of the audio return output circuit of the utility model embodiment is: technology needs main control chip to distribute the low and high level of the power end of GPIO mouth test HDMI now, and pass through the output of the software control audio return signal of chip, this also increases the complexity of software of main control chip while taking main control chip port resource.And the utility model passes through conducting and the cut-off of output control circuit, the control that audio return is exported can be realized, thus reduce the complexity of main control chip software, save main control chip port resource.Meanwhile, the utility model also provides a kind of audio return system, comprises the first equipment and the second equipment, and described first equipment comprises above-described audio return signal output apparatus.Described audio return system has the audio return function that hardware controls audio return signal exports, and system is simple and easy to realize.
Below be only preferred implementation of the present utility model, it should be pointed out that above-mentioned preferred implementation should not be considered as restriction of the present utility model.Protection range of the present utility model should be as the criterion with claim limited range.For those skilled in the art, not departing from spirit and scope of the present utility model, can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (9)
1. an audio return signal output apparatus, is characterized in that, comprises main control chip and output control circuit; Described main control chip has return path signal output; Described output control circuit has test side and control end; Described return path signal output is connected with described control end.
2. audio return signal output apparatus according to claim 1, is characterized in that, described output control circuit comprises the first resistance, the second resistance, the 3rd resistance, the first switching tube and second switch pipe; The first end of described first resistance is the test side of described output control circuit, and the second end is connected to the first end of described first switching tube; Second end of described first switching tube is connected with the first end of described second switch pipe by described second resistance; The first end of described 3rd resistance is connected to the first switching tube and the second resistance joint, and the second end is connected with DC power supply; 3rd end ground connection of described first switching tube; 3rd end ground connection of described second switch pipe; Described second switch pipe second end is the control end of described output control circuit.
3. audio return signal output apparatus according to claim 2, is characterized in that, the first switching tube of described output control circuit is triode or field effect transistor.
4. audio return signal output apparatus according to claim 2, is characterized in that, the second switch pipe of described output control circuit is triode or field effect transistor.
5. an audio return system, is characterized in that, comprises the first equipment and the second equipment; Described first equipment comprises the audio return signal output apparatus as described in claim 1-4; Described second equipment has return path signal receiving terminal, and the return path signal output of described audio return signal output apparatus is connected with described return path signal receiving terminal by HDMI wire.
6. audio return system according to claim 5, is characterized in that, described first equipment also comprises the first HDMI; Described second equipment also comprises the second HDMI; Described first HDMI is connected by described HDMI wire with described second HDMI; Described HDMI wire has ARC passage; Described return path signal output is connected to described return path signal receiving terminal by the ARC passage in described first HDMI, described HDMI wire, described second HDMI successively; Described test side is connected with the power end in described first HDMI.
7. audio return system according to claim 6, is characterized in that, described first equipment also comprises electric capacity, and described return path signal output is connected with described first HDMI by described electric capacity.
8. audio return system according to claim 7, is characterized in that, described HDMI wire is the HDMI wire of 1.4 editions.
9. audio return system according to claim 8, is characterized in that, described first equipment is television set; Described second equipment is power amplifier or DVD player.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520444703.3U CN204721468U (en) | 2015-06-25 | 2015-06-25 | Audio return signal output apparatus and audio return system |
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| CN201520444703.3U CN204721468U (en) | 2015-06-25 | 2015-06-25 | Audio return signal output apparatus and audio return system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341686A (en) * | 2016-09-13 | 2017-01-18 | 广州视源电子科技股份有限公司 | ARC testing method of electronic equipment and signal generator used for ARC testing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341686A (en) * | 2016-09-13 | 2017-01-18 | 广州视源电子科技股份有限公司 | ARC testing method of electronic equipment and signal generator used for ARC testing |
| CN106341686B (en) * | 2016-09-13 | 2018-06-26 | 广州视源电子科技股份有限公司 | The ARC test methods of electronic equipment and the signal generator for ARC tests |
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