CN209313968U - A kind of arc signal detection circuit, device and electronic product - Google Patents
A kind of arc signal detection circuit, device and electronic product Download PDFInfo
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- CN209313968U CN209313968U CN201822246270.7U CN201822246270U CN209313968U CN 209313968 U CN209313968 U CN 209313968U CN 201822246270 U CN201822246270 U CN 201822246270U CN 209313968 U CN209313968 U CN 209313968U
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Abstract
The utility model discloses a kind of arc signal detection circuit, device and electronic product.The utility model is by increasing signal amplification circuit, HDMI is shown that the arc signal of equipment passback amplifies, main controller detects arc signal, when detecting that there are when audio signal in arc signal, main controller starts dsp chip, make it into working condition, the utility model solves in the prior art, electronic product enters after standby mode dsp chip is closed, the problem of dsp chip can not be started automatically with audio signal, when having reached audio input, automatic starting dsp chip, realize the audio signal effect synchronous with signal is shown, improve user experience.
Description
Technical Field
The utility model relates to a HDMI audio signal technical field, in particular to ARC signal detection circuitry, device and electronic product.
Background
Generally, an HDMI (High Definition Multimedia Interface) device can realize an ARC (Audio Return Channel) function, so that a user can use an Audio/video function of the HDMI device by using only one HDMI cable, and can enjoy a function of playing sound of a television playing program in an HDMI product by using the ARC function, thereby reducing cumbersome connecting wires.
When a user uses the ARC function, the user pauses the television playing program, and a DSP (Digital Signal processing) chip detects whether an audio signal exists in the ARC signal in a working state; due to the need to reduce standby power consumption, the DSP chip will be turned off within a certain time to enter a standby state after no audio signal is detected. When the user returns to play the television program, at this time, the HDMI device is turned off because the HDMI device enters the standby function, and the HDMI device is not restarted because the HDMI device cannot detect the ARC signal, and cannot automatically play the audio, which affects the user experience.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a ARC signal detection circuitry aims at solving because DSP chip is closed when the electronic product dormancy, and unable automatic start when the audio input influences the problem of audio frequency function, improves user experience.
In order to achieve the above object, the present invention provides an ARC signal detection circuit, which includes a master controller and a signal amplification circuit; the signal amplification circuit is connected with the main controller; wherein,
the signal amplification circuit is used for receiving the ARC signal returned by the HDMI display equipment, amplifying the ARC signal and then sending the ARC signal to the main controller;
the main controller is used for receiving the ARC signal amplified by the signal amplifying circuit, detecting the amplified ARC signal, and starting the DSP chip when detecting that the ARC signal contains an audio signal.
Preferably, the ARC signal detection circuit further comprises a noise isolation circuit; the noise isolation circuit is connected with the signal amplification circuit; wherein,
the noise isolation circuit is used for isolating noise generated by the ground wire.
Preferably, the noise isolation circuit includes a second resistor, a third resistor and a third capacitor; wherein,
the first end of the second resistor is connected with the signal amplification circuit, the second end of the second resistor is grounded, the second end of the second resistor is connected with the signal amplification circuit, the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the power supply, the first end of the third resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the second end of the second resistor.
Preferably, the ARC signal detection circuit further comprises an HDMI display device, an HDMI chip, a DSP chip, a power amplifier, and a speaker; the HDMI display device is connected with the HDMI chip through an HDMI connecting wire, the HDMI chip is connected with the DSP chip, the DSP chip is connected with the power amplifier chip, and the power amplifier chip is connected with the loudspeaker; the master controller is also connected with the HDMI chip.
Preferably, the master controller is further configured to turn off the HDMI chip and the DSP chip when detecting that no audio signal exists in the ARC signal.
Preferably, the signal amplification circuit comprises a first capacitor, a second capacitor, a first resistor and an operational amplifier; wherein,
the first capacitor first end is connected with a power supply, the first capacitor second end is grounded, the first capacitor first end is further connected with an operational amplifier power end, the first capacitor second end is further connected with an operational amplifier grounding end, the second capacitor first end is connected with the HDMI display device, the second capacitor second end is connected with an operational amplifier in-phase input end, the second capacitor second end is further connected with the first resistor first end, the first resistor second end is grounded, the first resistor second end is further connected with a noise isolation circuit, an operational amplifier reverse input end is further connected with the noise isolation circuit, and an operational amplifier output end is further connected with the main controller.
Preferably, the master controller comprises a fourth capacitor, a fifth capacitor and a micro control unit; wherein,
the first end of the fourth capacitor is connected with the signal amplification circuit, the second end of the fourth capacitor is connected with the micro control unit, the first end of the fifth capacitor is connected with the micro control unit, the second end of the fifth capacitor is grounded, the first end of the fifth capacitor is further connected with the power supply, and the micro control unit is further connected with the HDMI chip and the DSP chip respectively.
The utility model also provides a ARC signal detection device, ARC signal detection device includes as above ARC signal detection circuitry.
The utility model discloses still provide an electronic product, electronic product includes as above ARC signal detection device.
The technical scheme of the utility model forms an ARC signal detection circuit through setting up signal amplification circuit and noise isolation circuit, wherein, the ARC signal that signal amplification circuit passed back to HDMI display device is amplified, and will amplify the signal after will be amplified and send to the master controller; the noise isolation circuit isolates the noise input to the signal amplification circuit by the ground wire, so that the detection accuracy of the main controller is improved; the master controller detects the ARC signal after enlargeing, when the master controller detects that ARC signal contains audio signal, starts the DSP chip for this electronic product can start the DSP chip rapidly when receiving audio signal under the dormancy state, realizes corresponding audio frequency function, has solved because the DSP chip is closed when the electronic product dormancy, can't automatic start when the audio frequency is imported, influences the problem of audio frequency function, strengthens product reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an ARC signal detection circuit of the present invention;
fig. 2 is a circuit diagram of another embodiment of the ARC signal detection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Signal amplifying circuit | R1～R3 | First to third resistors |
| 200 | Master controller | C1～C5 | First to fifth capacitors |
| 300 | Noise isolation circuit | VCC | Power supply |
| MCU | Micro control unit |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
The utility model provides a ARC signal detection circuitry.
Referring to fig. 1, in an embodiment of the present invention, the ARC signal detection circuit includes: a master controller 200 and a signal amplification circuit 100; the signal amplification circuit 100 is connected to the master 200.
The signal amplification circuit 100 is configured to receive an ARC signal returned by the HDMI display device, amplify the ARC signal, and send the amplified ARC signal to the master controller 200.
The main controller 200 is configured to receive the ARC signal amplified by the signal amplification circuit 100, detect the amplified ARC signal, and start the DSP chip when detecting that the ARC signal includes an audio signal.
It should be noted that, the ARC signal is usually low in voltage, and the master controller 200 cannot detect the ARC signal, so the ARC signal needs to be amplified, in this embodiment, the ARC signal detection circuit is installed on a sound product, the HDMI display device is a television, and the sound product is connected to the television through an HDMI connection line, and acquires the audio signal through the ARC function.
It is easy to understand that, the television product passes back the ARC signal, the power amplifier product plays the audio signal in the ARC signal, and when the television product pauses to play, the power amplifier product can close inside DSP chip for the demand of reducing power, after DSP chip closes, can't detect through self that the automatic start so increases signal amplification circuit 100 after the audio signal input, amplify the ARC signal to the degree that master controller 200 can detect, detect the ARC signal by master controller 200, when detecting to contain the audio signal in the ARC signal, start the DSP chip, make the audio frequency of power amplifier product broadcast and the video synchronization of TV set broadcast.
This embodiment is through setting up signal amplification circuit 100, amplify the ARC signal of HDMI display device passback, and signal transmission after will amplifying to master controller 200, detect by master controller 200, when master controller 200 detected audio signal, start the DSP chip, when making this electronic product receive audio signal under the dormancy state, can start the DSP chip rapidly, the realization corresponds the audio frequency function, the DSP chip is closed when having solved because electronic product dormancy, can't automatic start when the audio frequency input, influence the problem of audio frequency function, strengthen the product reliability.
Specifically, the ARC signal detection circuit further includes a noise isolation circuit 300; the noise isolation circuit 300 is connected to the signal amplification circuit 100.
The noise isolation circuit 300 is configured to isolate noise transmitted from the power source VCC ground to the signal amplification circuit 100.
It should be emphasized that, in the process of amplifying the signal, the signal amplifying circuit 100 is interfered by the noise transmitted from the ground line to the signal amplifying circuit 100, so that the amplified ARC signal and the sound information contained in the source ARC signal are deviated, which affects the detection of the master controller 200, and causes a false judgment, so that the noise isolating circuit 300 is added, and the voltage of the noise isolating circuit 300 is slightly greater than the voltage of the ground point, thereby isolating the noise transmitted from the ground line to the signal amplifying circuit 100.
In this embodiment, an ARC signal detection circuit is formed by providing the signal amplification circuit 100 and the noise isolation circuit 300, wherein the signal amplification circuit 100 amplifies an ARC signal returned by the HDMI display device and sends the amplified signal to the master controller 200; the noise isolation circuit 300 isolates the noise input by the ground wire to the signal amplification circuit 100, so that the detection accuracy of the master controller 200 is improved; the master controller 200 detects the amplified ARC signal, when the master controller 200 detects that the ARC signal contains an audio signal, the DSP chip is started, so that when the electronic product receives the audio signal in a dormant state, the DSP chip can be quickly started to realize a corresponding audio function, the problems that the audio function is influenced because the DSP chip is closed when the electronic product is dormant and cannot be automatically started when audio is input are solved, and the reliability of the product is enhanced.
As shown in fig. 2, in the embodiment of the present invention, the noise isolation circuit 300 includes a second resistor R2, a third resistor R3, and a third capacitor C3.
The first end of second resistance R2 with signal amplification circuit 100 connects, second resistance R2 second end ground connection, second resistance R2 second end still with signal amplification circuit 100 connects, the first end of second resistance R2 still with the first end of third resistance R3 is connected, third resistance R3 second end is connected with power VCC, the first end of third resistance R3 still with the first end of third electric capacity C3 is connected, third electric capacity C3 second end with second resistance R2 second end is connected.
It is worth emphasizing that the second resistor R2, the third resistor R3 and the third capacitor C3 provide a dc bias voltage for the signal amplifying circuit 100, in this embodiment, the voltage of the power VCC is 3.3V, the resistance of the third resistor R3 is 100K, the resistance of the second resistor R2 is 1K, and the resistance of the third capacitor C3 is 1uF, so that the dc bias voltage provided for the signal amplifying circuit 100 is 3.3 × 1/100 ═ 0.0327V, which is slightly higher than the ground level, and noise isolation can be achieved.
Specifically, the ARC signal detection circuit further comprises an HDMI display device, an HDMI chip, a DSP chip, a power amplifier, and a speaker; the HDMI display device is connected with the HDMI chip through an HDMI connecting wire, the HDMI chip is connected with the DSP chip, the DSP chip is connected with the power amplifier chip, and the power amplifier chip is connected with the loudspeaker; the master controller 200 is also connected to the HDMI chip.
It is easily understood that the HDMI chip is connected with HDMI display device to receive ARC signal and forward to the DSP chip, the audio signal of DSP chip in with ARC signal turns into high-low voltage so that loudspeaker vibrations sound production, however the voltage that the DSP chip sent is low excessively, so need power amplifier chip to amplify the voltage that the DSP chip sent, and with voltage transmission to loudspeaker, loudspeaker vibrations are sounded.
Specifically, the master controller 200 is further configured to turn off the HDMI chip and the DSP chip when detecting that no audio signal exists in the ARC signal.
It should be noted that, because the master controller 200 is adopted to detect whether the ARC signal contains an audio signal, and no DSP is needed to detect, the HDMI chip and the DSP chip can be turned off when the power amplifier product is in standby, so as to achieve the purpose of saving more power, and the power amplifier chip can be turned off if necessary, thereby effectively reducing power consumption during standby.
Specifically, the signal amplification circuit 100 includes a first capacitor C1, a second capacitor C2, a first resistor R1, and an operational amplifier.
The first end of first electric capacity C1 is connected with the power VCC, first electric capacity C1 second end ground connection, first electric capacity C1 first end still with operational amplifier power VCC holds and connects, first electric capacity C1 second end still with the operational amplifier earthing terminal is connected, second electric capacity C2 first end with HDMI display device connects, second electric capacity C2 second end with operational amplifier non-inverting input end connects, second electric capacity C2 second end still with the first end of first resistance R1 is connected, first resistance R1 second end ground connection, first resistance R1 second end still with noise isolation circuit 300 connects, operational amplifier reverse input end still with noise isolation circuit 300 connects, the operational amplifier output still with master controller 200 connects.
It should be emphasized that, since the ARC signal has an amplitude of 160mVp-p to 500mVp-p, which cannot satisfy the level detection requirement of the main controller 2003.3V, the signal amplification circuit 100 is added, the second capacitor C2 is used to isolate the dc level between the HDMI playback device and the audio product, the first resistor R1 is used to reduce the load at the input end of the operational amplifier, so as to reduce interference, and the two ends of the eighth capacitor are respectively connected to the power source VCC and the ground line, so as to supply power to the operational amplifier.
Specifically, the master controller 200 includes a fourth capacitor C4, a fifth capacitor, and a micro control unit MCU.
The first end of fourth electric capacity C4 with signal amplification circuit 100 connects, fourth electric capacity C4 second end with little the control unit MCU connects, the first end of fifth electric capacity with little the control unit MCU connects, fifth electric capacity second end ground connection, the first end of fifth electric capacity still is connected with the power VCC, little the control unit MCU still with the HDMI chip reaches the DSP chip is connected respectively.
It should be noted that the MCU detects whether the number of pulses in several unit times is the same through the break to detect whether there is an audio signal, and if the number of pulses in several unit times is the same, it is determined that the current ARC signal does not contain the audio signal, and if the number of pulses in several unit times is different, it is determined that the current ARC signal contains the audio signal.
In this embodiment, an ARC signal detection circuit is formed by providing the signal amplification circuit 100 and the noise isolation circuit 300, wherein the signal amplification circuit 100 amplifies an ARC signal returned by the HDMI display device and sends the amplified signal to the master controller 200; the noise isolation circuit 300 isolates the noise input by the ground wire to the signal amplification circuit 100, so that the detection accuracy of the master controller 200 is improved; the master controller 200 detects the amplified ARC signal, when the master controller 200 detects that the ARC signal contains an audio signal, the DSP chip is started, so that when the electronic product receives the audio signal in a dormant state, the DSP chip can be quickly started to realize a corresponding audio function, the problems that the audio function is influenced because the DSP chip is closed when the electronic product is dormant and cannot be automatically started when audio is input are solved, and the reliability of the product is enhanced.
The utility model discloses still provide a ARC signal detection device, ARC signal detection device includes as above ARC signal detection circuit, this ARC signal detection circuit's concrete structure refers to above-mentioned embodiment, because this ARC signal detection device has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and it is here no longer repeated one by one.
Furthermore, the utility model discloses still provide an electronic product, this electronic product includes as above ARC signal detection device. It is easy to understand that the electronic product has at least the beneficial effects brought by the above embodiments.
The electronic product may be a stereo or a television.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. An ARC signal detection circuit, comprising: a main controller and a signal amplifying circuit; the signal amplification circuit is connected with the main controller; wherein,
the signal amplification circuit is used for receiving the ARC signal returned by the HDMI display equipment, amplifying the ARC signal and then sending the ARC signal to the main controller;
the main controller is used for receiving the ARC signal amplified by the signal amplifying circuit, detecting the amplified ARC signal, and starting the DSP chip when detecting that the ARC signal contains an audio signal.
2. The ARC signal detection circuit of claim 1, wherein said ARC signal detection circuit further comprises a noise isolation circuit; the noise isolation circuit is connected with the signal amplification circuit; wherein,
the noise isolation circuit is used for isolating noise generated by the ground wire.
3. The ARC signal detection circuit of claim 2, wherein said noise isolation circuit comprises a second resistor, a third resistor, and a third capacitor; wherein,
the first end of the second resistor is connected with the signal amplification circuit, the second end of the second resistor is grounded, the second end of the second resistor is connected with the signal amplification circuit, the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the power supply, the first end of the third resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the second end of the second resistor.
4. The ARC signal detection circuit according to any one of claims 1 to 3, further comprising an HDMI display device, an HDMI chip, a DSP chip, a power amplifier chip and a speaker; the HDMI display device is connected with the HDMI chip through an HDMI connecting wire, the HDMI chip is connected with the DSP chip, the DSP chip is connected with the power amplifier chip, and the power amplifier chip is connected with the loudspeaker; the master controller is also connected with the HDMI chip.
5. The ARC signal detection circuit of claim 1, wherein the master is further configured to turn off the HDMI chip and the DSP chip when detecting that no audio signal is present in the ARC signal.
6. The ARC signal detection circuit of claim 2, wherein said signal amplification circuit comprises a first capacitor, a second capacitor, a first resistor, and an operational amplifier; wherein,
the first capacitor first end is connected with a power supply, the first capacitor second end is grounded, the first capacitor first end is further connected with an operational amplifier power end, the first capacitor second end is further connected with an operational amplifier grounding end, the second capacitor first end is connected with the HDMI display device, the second capacitor second end is connected with an operational amplifier in-phase input end, the second capacitor second end is further connected with the first resistor first end, the first resistor second end is grounded, the first resistor second end is further connected with a noise isolation circuit, an operational amplifier reverse input end is further connected with the noise isolation circuit, and an operational amplifier output end is further connected with the main controller.
7. The ARC signal detection circuit of claim 1, wherein said master comprises a fourth capacitor, a fifth capacitor, and a micro control unit; wherein,
the first end of the fourth capacitor is connected with the signal amplification circuit, the second end of the fourth capacitor is connected with the micro control unit, the first end of the fifth capacitor is connected with the micro control unit, the second end of the fifth capacitor is grounded, the first end of the fifth capacitor is further connected with the power supply, and the micro control unit is further connected with the HDMI chip and the DSP chip respectively.
8. An ARC signal detection device, characterized in that the ARC signal detection device comprises an ARC signal detection circuit according to any of claims 1-7.
9. An electronic product, characterized in that it comprises an ARC signal detection device according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822246270.7U CN209313968U (en) | 2018-12-28 | 2018-12-28 | A kind of arc signal detection circuit, device and electronic product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822246270.7U CN209313968U (en) | 2018-12-28 | 2018-12-28 | A kind of arc signal detection circuit, device and electronic product |
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| CN209313968U true CN209313968U (en) | 2019-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4017014A1 (en) * | 2020-12-18 | 2022-06-22 | Sagemcom Broadband Sas | Method and device for controlling the condition of a device comprising means for transferring an audiovisual source and means for recovery of an audio signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4017014A1 (en) * | 2020-12-18 | 2022-06-22 | Sagemcom Broadband Sas | Method and device for controlling the condition of a device comprising means for transferring an audiovisual source and means for recovery of an audio signal |
| FR3118376A1 (en) * | 2020-12-18 | 2022-06-24 | Sagemcom Broadband Sas | METHOD AND DEVICE FOR MONITORING THE STATE OF A DEVICE COMPRISING MEANS FOR TRANSFERRING AN AUDIOVISUAL SOURCE AND MEANS FOR RESTITUTING AN AUDIO SIGNAL. |
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Granted publication date: 20190827 Termination date: 20211228 |