CN212115506U - Display and audio circuit and device - Google Patents
Display and audio circuit and device Download PDFInfo
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- CN212115506U CN212115506U CN202021264902.3U CN202021264902U CN212115506U CN 212115506 U CN212115506 U CN 212115506U CN 202021264902 U CN202021264902 U CN 202021264902U CN 212115506 U CN212115506 U CN 212115506U
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Abstract
The utility model discloses a display and audio circuit and a device, wherein the circuit comprises a control chip, a gating module, a jack module and a detection circuit; the control chip is respectively connected with the gating module and the detection circuit, and the jack module is respectively connected with the detection circuit and the gating module; the detection circuit is used for sending an access signal to the control chip when detecting that the external equipment is accessed to the jack module; the gating module is used for sending a synchronization signal sent by external equipment to the control chip when receiving the synchronization signal; the control chip is used for receiving the video signals input by the external equipment through the jack module and the gating module when receiving the synchronous signals; and when the synchronous signal is not received, outputting the audio signal to the external equipment through the gating module and the jack module. The utility model discloses can realize audio frequency and video function's multiplexing through same jack module, avoid the user still need carry out the selection of audio frequency jack or video jack when inserting external equipment, can also reduce jack quantity, reduction in production cost.
Description
Technical Field
The utility model relates to a circuit electron field especially relates to demonstration and audio circuit and device.
Background
At present, the existing intelligent devices such as televisions and PCs are generally provided with an earphone jack and a video jack, wherein the earphone jack is used for accessing an earphone, and the video jack is used for accessing a display device. Because the earphone jack and the video jack are similar in specification and size and are arranged at positions very close to each other, when a user needs to use the earphone function or the video function, the user often needs to carefully distinguish the jack name and then access the equipment, and when a panel of a television or a back plate of a PC host is in a dark place, the user is more difficult to distinguish the earphone jack and the video jack. And, set up earphone jack and a plurality of video jack and still can promote smart machine's manufacturing cost, cause the wasting of resources.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a display and audio circuit and device, which is designed to solve the problem that the cost of the device with a plurality of jacks is high and the jacks need to be distinguished during use.
In order to achieve the above object, the present invention provides a display and audio circuit, including: the device comprises a control chip, a gating module, a jack module and a detection circuit; the control chip is respectively connected with the gating module and the detection circuit, the gating module is connected with the jack module, and the jack module is connected with the detection circuit;
the detection circuit is used for sending an access signal to the control chip to connect the control chip with the gating module when detecting that the external equipment is accessed to the jack module;
the gating module is used for sending the synchronous signal to the control chip when receiving the synchronous signal sent by the external equipment;
the control chip is used for receiving the video signals input by the external equipment through the jack module and the gating module when receiving the synchronous signals; and when the synchronous signal is not received, outputting an audio signal to the external equipment through the gating module and the jack module.
Optionally, the jack module includes an insertion detection end, a signal transmission end and a synchronization signal receiving end;
the insertion detection end comprises a detection terminal, the detection terminal is connected with the insertion detection end to ground the detection circuit when the external equipment is not accessed, and the detection terminal is disconnected with the insertion detection end when the external equipment is accessed;
the synchronous signal receiving end is used for receiving a synchronous signal input by the external equipment;
the signal transmission end is used for transmitting a video signal to the gating module or transmitting an audio signal to the external equipment.
Optionally, the detection circuit includes a first resistor, a second resistor, a third resistor, and a first switch, and the jack module further includes a fourth resistor;
the first end of the first resistor is connected with a high level, the second end of the first resistor is connected with the first end of the second resistor and the collector of the first switch, the second end of the second resistor is connected with the base of the first switch, the emitter of the first switch is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
the detection terminal is grounded through the fourth resistor, and the insertion detection end is connected with the base electrode of the first switch.
Optionally, the detection end of the control chip is connected with the emitter of the first switch;
the control chip is further configured to control the gating module to send the received synchronization signal to the control chip when receiving an access signal sent by the detection circuit; when the synchronous signal is received, receiving a video signal input by the gating module; and when the synchronous signal is not received, outputting an audio signal to the gating module.
Optionally, the gating module includes a first path and a second path;
the gating module is used for sending the audio signal output by the control chip to the jack module through the first path and sending the video signal input by the jack module to the control chip through the second path.
Optionally, the first path includes a first left port and a first right port, and the second path includes a second left port, a second right port, and a video port.
Optionally, the first path and the second path include a plurality of capacitors, and the control chip is connected to the gating module through the plurality of capacitors.
Optionally, the detection circuit further comprises a first capacitor connected in parallel with the third resistor.
Optionally, the first switch is an NPN transistor.
In addition, in order to achieve the above object, the present invention further provides a display and audio device, the display and audio device includes a display and audio circuit and an external device connected to the display and audio circuit, and the display and audio circuit is configured as the display and audio circuit as described above.
The utility model discloses a jack module can realize display device or audio equipment's access. After the external device is connected to the jack module, the control chip can determine whether the external device is an audio device or a display device according to whether the synchronization signal is received. If the video signal is the audio device, the audio signal is output, and if the video signal is the display device, the video signal is received. The audio equipment and the display equipment can share the same jack module, and realize corresponding audio functions or video functions according to the types of the external equipment after being plugged, so that the user is prevented from selecting the audio jack or the video jack when the external equipment is plugged. And the multiplexing of audio frequency and video frequency function is realized through the same jack module, and the number of jacks can be reduced, and the production cost is reduced.
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 diagram of a circuit structure of an embodiment of the display and audio circuit of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
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, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a show and audio circuit, this show can be connected with external equipment with audio circuit to judge that external equipment is audio equipment or display device, and then output audio signal or receive video signal.
Referring to fig. 1, in one embodiment, the display and audio circuit includes a control chip 10, a gating module 20, a jack module 30, and a detection circuit 40. The control chip 10 is respectively connected with the gating module 20 and the detection circuit 40, the gating module 20 is connected with the jack module 30, and the jack module 30 is connected with the detection circuit 40. The jack module 30 can be connected to an accessed external device 50. When the external device 50 accesses the jack module 30, the detection circuit 40 may detect the external device 50 and send an access signal to the control chip 10. When the control chip 10 does not receive the access signal, it closes the input/output connection with the gating module 20. When the control chip 10 receives the access signal, the control signal may be sent to control the gating module 20 to communicate the synchronization signal receiving end of the jack module 30 with the control chip 10, and detect whether the jack module 30 transmits the synchronization signal sent by the external device 50 to the control chip 10. When the control chip 10 can receive the synchronization signal, it indicates that the accessed external device 50 is a display device, and when the control chip 10 cannot receive the synchronization signal, it indicates that the accessed external device 50 is an audio device. When it is determined that the external device 50 is a display device, a video signal input from the display device may be received through the jack module 30 and transmitted to the control chip 10 through the gating module 20, and when it is determined that the external device 50 is an audio device, such as a headphone, the control chip 10 may output an audio signal and output to the audio device through the gating module 20 and the jack module 30.
In this embodiment, access to the display device or audio device may be achieved through one jack module 30. After the external device 50 is connected to the jack module 30, the control chip 10 may determine whether the external device 50 is an audio device or a display device according to whether the synchronization signal is received. If the video signal is the audio device, the audio signal is output, and if the video signal is the display device, the video signal is received. The audio device and the display device may share the same jack module 30, and implement corresponding audio functions or video functions according to the type of the external device 50 after being plugged in, so as to avoid the need for the user to select an audio jack or a video jack when the user plugs in the external device 50. And the multiplexing of audio and video functions is realized through the same jack module 30, the number of jacks can be reduced, and the production cost is reduced.
Further, the jack module 30 may include a plug detection terminal, a signal transmission terminal, and a synchronization signal receiving terminal, and may further include a ground terminal connected to ground. The detection terminal is arranged in the insertion detection end, when the external device 50 is not inserted, the detection terminal is connected with the insertion detection end, the other end of the detection terminal is grounded, the other end of the insertion detection end is connected with the detection circuit 40, and namely the detection terminal grounds the detection circuit 40. When the external device 50 is connected, the detection terminal is pushed up or bounced to disconnect the detection terminal from the insertion detection terminal, i.e., the detection circuit 40 is disconnected from the ground. The detection terminal may be a detection reed having conductivity. The detection circuit 40 can generate a corresponding access signal and send the signal to the control chip 10 when not grounded. The synchronization signal receiving terminal may receive a synchronization signal input from the external device 50 and transmit the synchronization signal to the gating module 20. After receiving the access signal, the control chip 10 may control the gating module 20 to connect the path receiving the synchronization signal with the control chip 10. After the control chip 10 receives the synchronization signal through the gating module 20, it can determine that the external device 50 is a display device. The signal transmission terminal may receive the audio signal transmitted by the gating module 20 and transmit the audio signal to the audio device, or receive the video signal transmitted by the display device and transmit the video signal to the gating module 20.
It should be noted that the video signal also includes the audio signal, and the audio signal can be generally divided into left and right channel signals. Thus, the signal transmission end may comprise a left channel end and a right channel end. Accordingly, the detection terminal may also include a left spring and a right spring for detecting the left and right paths of the external device 50, respectively. That is, the left and right channel paths of the external device 50 can be individually accessed and detected by the left reed and the right reed.
The detection circuit 40 may include a first resistor R1, a second resistor R2, a third resistor R3, and a first switch Q1, and the jack module 30 may further include a fourth resistor R4. The first switch Q1 may be an NPN transistor. The first end of the first resistor R1 is connected to a high level, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the collector of the first switch Q1, the second end of the second resistor R2 is connected to the base of the first switch Q1, the emitter of the first switch Q1 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is grounded. When the detection terminal is connected to the insertion detection terminal, the other end of the detection terminal is grounded via the fourth resistor R4, and the insertion detection terminal is connected to the base of the first switch Q1. The third resistor R3 may also be connected in parallel with the first capacitor C1 to filter out noise or high frequency harmonics in the current signal. It is understood that, when the test terminals are provided with two left and right reeds, the jack module 30 may further include a fifth resistor R5, and the two test terminals are grounded through a fourth resistor R4 and a fifth resistor R5, respectively.
When the first switch Q1 is an NPN-type transistor, if the detection terminal is connected to the insertion detection terminal, the high level passes through the first resistor R1, the second resistor R2 and the fourth resistor R4 in sequence and is grounded, and the base level of the first switch Q1 is the voltage value at both ends of the fourth resistor R4. By setting the resistance values of the first resistor R1, the second resistor R2, and the fourth resistor R4, the base level of the first switch Q1 can be made low, so that the first switch Q1 is turned off. The detection terminal of the control chip 10 is connected to the emitter of the first switch Q1, and when the first switch Q1 is turned off, the detection terminal of the control chip 10 is grounded through the third resistor R3, that is, the control chip 10 detects a low level.
If the external device 50 is connected to disconnect the detection terminal from the insertion detection terminal, the base of the first switch Q1 receives a high level, the first switch Q1 is turned on, and at this time, the level value of the emitter of the first switch Q1 is the voltage across the third resistor R3, and the emitter frequency of the first switch Q1 can be a high level by setting the resistance values of the third resistor R3 and the first resistor R1, that is, the detection terminal of the control chip 10 detects a high level, which is an access signal. In a preferred embodiment, the high level may be set to 5V, and the resistances of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are 1k Ω, 10k Ω, 4.7k Ω and 1k Ω, respectively. When the detection terminal is connected to the insertion detection terminal, the base of the first switch Q1 is at a low level, and the detection terminal of the control chip 10 is directly grounded through the third resistor R3, that is, the control chip 10 receives the low level. When the detection terminal is disconnected from the insertion detection terminal, the base of the first switch Q1 is at a high level, and the level of the detection terminal of the control chip 10 is 5 × 4.7/(1+4.7) ═ 4.2V, that is, the control chip 10 receives the high level.
When the control chip 10 does not receive the high level, the input/output interface of the control chip 10 may be set to a high impedance state to isolate the input/output signal. When the control chip 10 receives a high level, the first strobe signal may be sent to the DE _ C pin of the strobe module 20 through the DE _ C1 pin of the control chip 10, so that the DE _ C pin of the strobe module 20 is set to 0, the strobe module 20 strobes the Y _ CV pin and the B _ CV pin, the Y _ CV pin of the strobe module 20 may be connected to the CVBS terminal of the jack module 30, and when the accessed external device 50 is a display device, the display device may send a synchronization signal through the CVBS terminal. After the gating module 20 gates the Y _ CV pin and the B _ CV pin, the control chip 10 may detect whether a synchronization signal is received through a CVBS _ EX pin connected to the B _ CV pin of the gating module 20. Preferably, the control chip 10 may detect whether the CVBS _ EX pin receives the synchronization signal 3 times in succession. It can be understood that when the high level detected by the control chip 10 changes to the low level, indicating that the external device is disconnected, the control chip 10 changes the input/output interface to the high impedance state again to isolate the input/output signal, and the detection is cycled through the detection terminal until the high level is detected again.
When the control chip 10 does not receive the synchronization signal, it may be determined that the access device is an audio device, and the pin DE _ C of the gating module 20 is set to 1. The control chip 10 may send a second strobe signal to the DE _ LR pin of the strobe module 20 through the DE _ LR1 pin to set the DE _ LR pin of the strobe module 20 to 1. When the DE _ LR pin of the gating module 20 is set to 1, the gating module 20 gates the a _ L pin and the Y _ L pin and gates the a _ R pin and the Y _ R pin, that is, left and right audio signal data may be transmitted to the audio device through the gating module 20 and the jack module 30 via the L pin and the R pin of the control chip 10.
When the control chip 10 receives the synchronization signal, it may be determined that the access device is a display device, at this time, the control chip 10 may set the DE _ C pin of the gating module 20 to 1, gate the Y _ CV pin of the gating module 20 and the a _ CV pin, and the control chip 10 may receive a video signal input by the display device through the Y _ CV pins of the jack module 30 and the gating module 20 through the CVBS pin. And the control chip 10 may also send a second strobe signal to the DE _ LR pin of the strobe module 20 through the DE _ LR1 pin to set the DE _ LR pin of the strobe module 20 to 0. When the DE _ LR pin of the gating module 20 is set to 0, the gating module 20 gates the B _ L pin and the Y _ L pin and gates the B _ R pin and the Y _ R pin, that is, receives left and right audio signal data transmitted by the display device through the AV _ L pin and the AV _ R pin of the control chip 10.
It will be appreciated that the gating module 20 may be a 3-channel, 2-to-1 data gate. When the pin DE _ C of the gating module 20 is set to 1 and the pin DE _ LR is set to 1, the pin a _ L and the pin Y _ L of the gating module 20 are gated, the pin a _ R and the pin Y _ R are gated, at this time, the pin CVBS of the control chip 10 may be set to a low level, the pin L and the pin R of the control chip 10 may send audio signals to an audio device through the gating module 20 and the jack module 30, the path is a first path of the gating module 20, and a first left port and a first right port of the first path are the pin a _ L and the pin a _ R of the gating module 20, respectively.
When the DE _ C pin of the gating module 20 is set to 1 and the DE _ LR pin is set to 0, the Y _ CV pin and the a _ CV pin of the gating module 20 gate, the B _ L pin and the Y _ L pin gate, and the B _ R pin and the Y _ R pin gate, at this time, the CVBS pin, the AV _ L pin, and the AV _ R pin of the control chip 10 may receive a complete video signal output by the display device, the path is a second path of the gating module 20, and a second left port, a second right port, and a video port of the second path are the B _ L pin/B _ R pin and the a _ CV pin of the gating module 20, respectively.
It can be understood that when the pins between the control chip 10 and the gating module 20 are connected, a capacitor may be further disposed to isolate the ac signals, so as to avoid interference to the data transmission process. Specifically, the pins of B _ R, A _ R, B _ L, A _ L, B _ CV and a _ CV of the gating module 20 are connected to corresponding pins in the control chip 10 through the second capacitor C2 to the seventh capacitor C7, respectively.
It should be noted that the control chip 10 may perform data transmission with the gating module 20 through the first path or the second path, and a plurality of capacitors may be disposed in the first path and the second path, so that pins of each path of data transmission of the control chip 10 are connected with pins of the gating module 20 through the capacitors. Specifically, the CVBS pin, the CVBS _ EX pin, the L pin, the R pin, the AV _ L pin, and the AV _ R pin of the control chip 10 may be connected to the a _ CV pin, the B _ CV pin, the a _ L pin, the a _ R pin, the B _ L pin, and the B _ R pin of the gating module 20 through capacitors.
The utility model also provides a show and audio frequency device, should show and audio frequency device including showing with audio frequency circuit and inserting show and audio frequency circuit's external equipment, the structure that should show and audio frequency circuit can refer to above-mentioned embodiment, no longer gives unnecessary details here. It should be noted that, since the display and audio apparatus of the present embodiment adopts the technical solution of the display and audio circuit, the display and audio apparatus has all the advantages of the display and audio circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A display and audio circuit, comprising: the device comprises a control chip, a gating module, a jack module and a detection circuit; the control chip is respectively connected with the gating module and the detection circuit, the gating module is connected with the jack module, and the jack module is connected with the detection circuit;
the detection circuit is used for sending an access signal to the control chip to connect the control chip with the gating module when detecting that the external equipment is accessed to the jack module;
the gating module is used for sending the synchronous signal to the control chip when receiving the synchronous signal sent by the external equipment;
the control chip is used for receiving the video signals input by the external equipment through the jack module and the gating module when receiving the synchronous signals; and when the synchronous signal is not received, outputting an audio signal to the external equipment through the gating module and the jack module.
2. The display and audio circuit of claim 1, wherein the jack module comprises an insertion detection terminal, a signal transmission terminal, and a synchronization signal reception terminal;
the insertion detection end comprises a detection terminal, the detection terminal is connected with the insertion detection end to ground the detection circuit when the external equipment is not accessed, and the detection terminal is disconnected with the insertion detection end when the external equipment is accessed;
the synchronous signal receiving end is used for receiving a synchronous signal input by the external equipment;
the signal transmission end is used for transmitting a video signal to the gating module or transmitting an audio signal to the external equipment.
3. The display and audio circuit of claim 2, wherein the detection circuit comprises a first resistor, a second resistor, a third resistor, and a first switch, the jack module further comprising a fourth resistor;
the first end of the first resistor is connected with a high level, the second end of the first resistor is connected with the first end of the second resistor and the collector of the first switch, the second end of the second resistor is connected with the base of the first switch, the emitter of the first switch is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
the detection terminal is grounded through the fourth resistor, and the insertion detection end is connected with the base electrode of the first switch.
4. The display and audio circuit of claim 3, wherein the detection terminal of the control chip is connected to the emitter of the first switch;
the control chip is further configured to control the gating module to send the received synchronization signal to the control chip when receiving an access signal sent by the detection circuit; when the synchronous signal is received, receiving a video signal input by the gating module; and when the synchronous signal is not received, outputting an audio signal to the gating module.
5. The display and audio circuit of claim 4, wherein the gating module comprises a first path and a second path;
the gating module is used for sending the audio signal output by the control chip to the jack module through the first path and sending the video signal input by the jack module to the control chip through the second path.
6. The display and audio circuit of claim 5, wherein the first pathway includes a first left port and a first right port, and the second pathway includes a second left port, a second right port, and a video port.
7. The display and audio circuit of claim 5, wherein the first path and the second path comprise a plurality of capacitors, and wherein the control chip is coupled to the gating module via the plurality of capacitors.
8. The display and audio circuit of any of claims 3-7, wherein the detection circuit further comprises a first capacitor connected in parallel with the third resistor.
9. The display and audio circuit according to any of claims 3 to 7, wherein the first switch transistor is an NPN transistor.
10. A display and audio apparatus, characterized in that the display and audio apparatus comprises an external device and a display and audio circuit according to any one of claims 1 to 9, the external device being connected to the display and audio circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021264902.3U CN212115506U (en) | 2020-07-01 | 2020-07-01 | Display and audio circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021264902.3U CN212115506U (en) | 2020-07-01 | 2020-07-01 | Display and audio circuit and device |
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| CN212115506U true CN212115506U (en) | 2020-12-08 |
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| CN202021264902.3U Active CN212115506U (en) | 2020-07-01 | 2020-07-01 | Display and audio circuit and device |
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