CN101742201B - Switching system and method for video signal transmission and audio signal transmission - Google Patents

Abstract

The invention relates to a switching method of video signal transmission and audio signal transmission, which is used for solving the problem that a single socket can only provide a single transmission line plug for use. The switching method comprises the following steps: judging whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug; generating a discrimination signal according to the discrimination result; controlling a change-over switch according to the discrimination signal; and switching the transmission channel into a video signal transmission channel or an audio signal transmission channel through the switch so as to transmit the video signal or the audio signal. Therefore, users can carry out different signal transmission operations by only directly replacing different transmission lines. In addition, a switching system for video signal transmission and audio signal transmission is also disclosed.

Description

Switching system and method for video signal transmission and audio signal transmission

technical field

The present invention relates to a system and method for switching signal transmission channels, and in particular to a system and method for switching video signal transmission and audio signal transmission.

Background technique

Generally, when users use earphones or microphones to transmit sound signals, they usually couple the transmission line plug of the earphones or microphones to the socket of the audio transmission channel, so as to listen or talk. In addition, when the user wants to watch the video, the plug of the transmission line of the video must be coupled to the socket of the video signal transmission channel separately, so as to watch the video.

However, in this way, when the user only needs to transmit the audio signal or the video signal, another unused socket will be left unused, resulting in a redundant situation. Therefore, in the case that the user only needs to transmit audio signals or video signals, it is not necessary to provide sockets for audio signal and video signal transmission channels at the same time. On the contrary, if only the socket of the audio signal or video signal transmission channel is set, when the user wants to switch the operation mode, for example: the user wants to switch the original listening or talking action to the action of watching the video, the user will will not be able to perform its operation because it does not have the required socket.

Therefore, it is necessary to provide a switching method for the user to perform audio signal transmission and video signal transmission through a single socket.

Contents of the invention

The purpose of the present invention is to provide a switching system and method for video signal transmission and audio signal transmission, so that users can switch between audio signal transmission and video signal transmission on a single socket.

According to an embodiment of the present invention, a switching system for video signal transmission and audio signal transmission is proposed. The switching system includes a transmission line socket, a judging circuit, a central processing unit and a switching switch. The transmission line socket is used for coupling a transmission line plug. The judging circuit is electrically coupled to the transmission line socket, and when the transmission line plug is coupled to the transmission line socket, it judges whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug, and generates a discrimination signal according to the judgment result. The central processing unit is electrically coupled to the judging circuit to receive the judging signal. The switch is electrically coupled to the transmission line socket, and is controlled by the central processing unit according to the discrimination signal, so as to switch the transmission channel to a video signal transmission channel or an audio signal transmission channel for a video signal or an audio signal for signal transmission.

According to another embodiment of the present invention, a method for switching between video signal transmission and audio signal transmission is proposed. The switching method includes judging whether a transmission line plug is a video signal transmission line plug or an audio signal transmission line plug; generating a discrimination signal according to the discrimination result; controlling a switching switch according to the discrimination signal; and switching the transmission channel to a video signal through the switching switch. The signal transmission channel or an audio signal transmission channel is used for signal transmission of a video signal or an audio signal.

According to the technical content of the present invention, the application of the switching system and method for video signal transmission and audio signal transmission can allow users to use a single socket to perform audio signal transmission or switch to video signal transmission, so that when the user only When the transmission of audio signals or video signals is required, there will be no redundant situation caused by another unused socket being idle, and thus the production cost of redundant sockets can be saved, and the appearance can be beautified.

Description of drawings

1 is a schematic block diagram of a switching system for video signal transmission and audio signal transmission according to an embodiment of the present invention;

2A and 2B are schematic diagrams of the basic structures of a general audio signal transmission line plug and a video signal transmission line plug;

3 is a schematic circuit diagram of a transmission line socket and a discrimination circuit according to an embodiment of the present invention;

Fig. 4 is a flowchart of a method for switching video signal transmission and audio signal transmission according to an embodiment of the present invention.

[Description of main component symbols]

100: Switching system 102: Transmission line plug

104: Transmission line socket 106: Discrimination circuit

108: Central processing unit 110: Switch

310: Contact point 400～412: Steps

Detailed ways

FIG. 1 is a schematic block diagram of a switching system for video signal transmission and audio signal transmission according to an embodiment of the present invention. The switch system 100 includes a transmission line socket 104 , a discrimination circuit 106 , a central processing unit 108 and a switch 110 . The transmission line socket 104 is used for coupling a transmission line plug 102 . The discrimination circuit 106 is electrically coupled to the transmission line socket 104, and when the transmission line plug 102 is coupled to the transmission line socket 104, it determines whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug, and then generates a discriminant signal. The central processing unit 108 is electrically coupled to the judging circuit 106 to receive the judging signal generated by the judging circuit 106 to control the switching action of the switch 110 . The switch 110 is electrically coupled to the transmission line socket 104, and is controlled by the central processing unit 108 to switch the transmission channel to a video signal transmission channel or an audio signal transmission channel for a video signal or an audio signal for signal transmission. It is worth noting here that the signal transmission referred to above is not limited to the transmission of signals from the transmission line plug 102 to the switching system 100, or the transmission of signals from the switching system 100 to the transmission line plug 102, anyone with ordinary knowledge in the art Different signal transmission methods can be performed according to the type of signal to be transmitted.

When the transmission line plug 102 is coupled to the transmission line socket 104 , the judging circuit 106 judges the impedance of the transmission line plug 102 to determine whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug. More specifically, the judging circuit 106 judges the transmission line plug by judging the impedance of the portion of the transmission line plug that mainly determines the transmission of the video signal or the audio signal.

2A and 2B are schematic diagrams of the appearance and basic structure of a general audio signal transmission line plug and a video signal transmission line plug, respectively. As shown in the figure, the part of the audio signal transmission line plug from bottom to top is the ground terminal (GND), the left channel terminal (HSOL), the right channel terminal (HSOR) and the audio signal terminal that actually determines the transmission of the audio signal. The part of the video signal transmission line plug from bottom to top is the ground terminal (GND), the left channel terminal (HSOL), the right channel terminal (HSOR) and the video signal terminal that actually determines the video signal transmission. Generally, the difference between the above two transmission line plugs is only the signal end that determines the signal transmission, and generally speaking, the impedance value of the video signal end is smaller than the impedance value of the audio signal end. In one embodiment, the impedance of the video signal end is about 75 Ohm, and the impedance of the audio signal end is about 1000-1500 Ohm. Since the impedance values of the two are quite different, in this way, the discrimination circuit 106 can determine the impedance of the signal end, and then determine whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug.

The positions of the ground terminal (GND), the left channel terminal (HSOL), the right channel terminal (HSOR) and the distribution of the signal terminals shown in the above-mentioned Fig. 2A and Fig. 2B are only used as examples for convenience of description, Generally, knowledgeable personnel can use transmission line plugs with different distribution positions according to different requirements. For example, in another embodiment, the video signal terminal or the audio signal terminal is not located at the top of the drawing as described above, but is located in the third section. Nevertheless, the judging circuit 106 determines whether the transmission line plug 102 is a video signal transmission line plug or an audio signal transmission line plug by judging the impedance of the signal terminal.

FIG. 3 is a schematic circuit diagram of a transmission line socket and a discrimination circuit according to an embodiment of the present invention. As shown in the figure, the transmission line socket 104 includes a plurality of contact points 310 for electrically contacting the signal terminal, the left channel terminal (HSOL), the right channel terminal (HSOR) and the like of the transmission line plug 102 respectively. The discrimination circuit 106 includes a bipolar junction transistor (BJT) Q1, wherein when the transmission line plug 102 is coupled to the transmission line socket 104, the transistor Q1 is electrically coupled to the transmission line socket 104 via its emitter terminal and the contact point 310. The signal end of the transmission line plug 102 acts according to the impedance of the signal end of the transmission line plug 102 to generate a discrimination signal at its collector. In addition, the signal end of the transmission line plug 102 forms a signal transmission channel through the contact point 310 and the switch 110 , so that the video signal or audio signal can be transmitted in the signal transmission channel after the switch 110 is switched.

Hereinafter, an embodiment will be used to illustrate the switching situation in the switching system when different transmission line plugs are used. Firstly, when the transmission line plug 102 is inserted into the transmission line socket 104, the transmission line socket 104 can trigger and generate a discrimination trigger signal according to the electrical contact of the transmission line plug 102, and transmit the discrimination trigger signal to the central processing unit 108 to notify the central processing unit The unit 108 controls the switch 110 according to the result of the discrimination.

When the transmission line plug 102 inserted into the transmission line socket 104 is a video signal transmission line plug, the transistor Q1 generates a low level signal at its collector according to the impedance of the video signal transmission line plug, and transmits it to the central processing unit 108 . At this time, the central processing unit 108 controls the switch 110 according to the low level signal, and the switch 110 switches the transmission channel to the video signal transmission channel. Therefore, the video signal will be transmitted in the video signal transmission channel formed by the video signal transmission line plug and the switching switch 110 .

On the other hand, when the transmission line plug 102 inserted into the transmission line socket 104 is an audio signal transmission line plug, the transistor Q1 will generate a high level signal at its collector according to the impedance of the audio signal transmission line plug, and transmit it to the central processing unit 108 . At this time, the central processing unit 108 controls the switch 110 according to the high level signal, and the switch 110 switches the transmission channel to an audio transmission channel. Therefore, the audio signal will be transmitted in the audio signal transmission channel formed by the audio signal transmission line plug and the switching switch 110 . In this way, the switching action of the transmission channel can be performed by directly identifying the type of the transmission line plug.

Fig. 4 is a flowchart of a method for switching video signal transmission and audio signal transmission according to an embodiment of the present invention. Firstly, it is determined whether a transmission line plug is a video signal transmission line plug or an audio signal transmission line plug (step 400 ). Wherein, step 400 may also include determining the impedance of the transmission line plug, so as to determine whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug. More specifically, it can be determined whether the transmission line plug is a video signal transmission line plug or an audio signal transmission line plug by judging the impedance of the part of the transmission line plug that mainly determines the transmission of video signals or audio signals. Generally speaking, the impedance value of the video signal end in the transmission line plug is much smaller than the impedance value of the audio signal end. Therefore, the type of transmission line plug can be judged by judging the impedance of the two.

Next, a discrimination signal is generated according to the discrimination result (step 402). Wherein, when the transmission line plug is a video signal transmission line plug, a low level signal can be generated as a discrimination signal according to the impedance of the video signal transmission line plug. On the contrary, when the transmission line plug is an audio signal transmission line plug, a high level signal can be generated as a discrimination signal according to the impedance of the audio signal transmission line plug.

Then, it is determined whether the generated discrimination signal is a low level signal or a high level signal (step 404 ). When the discrimination signal is a low-level signal, a switch is controlled according to the low-level signal (step 406), and then the transmission channel is switched to a video signal transmission channel by the switch (step 408), so that a video signal is used for signal transmission . On the other hand, when the discrimination signal is a high-level signal, the switch is controlled according to the high-level signal (step 410), and then the transmission channel is switched to an audio signal transmission channel through the switch (step 412) for an audio signal for signal transmission.

From the above embodiments of the present invention, it can be known that the switching system and method for video transmission and audio transmission can allow users to transmit audio signals or switch to video signal transmission through the use of a single socket, so that when the user only When the transmission of audio signals or video signals is required, there will be no redundant situation caused by another unused socket being idle, and thus the production cost of redundant sockets can be saved, and the appearance can be beautified.

Although the present invention has been disclosed above with embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field of the present invention can make various changes without departing from the spirit and scope of the present invention. and retouching, so the protection scope of the present invention should be determined by the scope defined in the appended claims.

Claims (11)

1. the switched system of video signal transmission and audio signal transmission is characterized in that, comprises:

One transmission line socket is used for a transmission wire plug to couple;

One judging circuit, be electrically coupled to this transmission line socket, and when this transmission wire plug coupled this transmission line socket, to differentiate this transmission wire plug be a video signal transmission wire plug or be an audio signal transmission wire plug, and produce a judgment signal according to discrimination result;

One CPU is electrically coupled to this judging circuit to receive this judgment signal; And

One switches switch, be electrically coupled to this transmission line socket, and control according to this judgment signal by this CPU, so as to transmission channel being switched to a video signal transmission passage or an audio signal transmission passage, carry out the signal transmission for a vision signal or an audio signal.

2. switched system according to claim 1 is characterized in that, this judging circuit is an impedance magnitude of differentiating this transmission wire plug, is this video signal transmission wire plug or this audio signal transmission wire plug to determine this transmission wire plug.

3. switched system according to claim 2 is characterized in that, this judging circuit is an impedance magnitude of differentiating the part that this vision signal of major decision in this transmission wire plug or this audio signal transmit.

4. switched system according to claim 2 is characterized in that, this judging circuit also comprises:

One transistor, have one first end and one second end, wherein this first end is to be electrically coupled to this transmission line socket, this second end is to be electrically coupled to this CPU, and this transistor is to move according to the impedance magnitude of this transmission wire plug when this transmission wire plug couples this transmission line socket, so as to producing this judgment signal at this second end.

5. switched system according to claim 4, it is characterized in that, when this transmission wire plug was this video signal transmission wire plug, this judgment signal was a low level signal, and this diverter switch switches to this video signal transmission passage according to this low level signal with transmission channel.

6. switched system according to claim 4, it is characterized in that, when this transmission wire plug was this audio signal transmission wire plug, this judgment signal was a high levels signal, and this diverter switch switches to this audio signal transmission passage according to this high levels signal with transmission channel.

7. the changing method of video signal transmission and audio signal transmission is characterized in that, comprises:

To differentiate a transmission wire plug be a video signal transmission wire plug or be an audio signal transmission wire plug;

Produce a judgment signal according to discrimination result;

Switch switch according to this judgment signal control one; And

By this diverter switch transmission channel is switched to a video signal transmission passage or an audio signal transmission passage, carry out the signal transmission for a vision signal or an audio signal.

8. changing method according to claim 7 is characterized in that, the step of differentiating this transmission wire plug also comprises:

Differentiating the impedance magnitude of this transmission wire plug, is this video signal transmission wire plug or this audio signal transmission wire plug to determine this transmission wire plug.

9. changing method according to claim 8 is characterized in that, the step of differentiating the impedance magnitude of this transmission wire plug also comprises:

Differentiate the impedance magnitude of the part that this vision signal of major decision in this transmission wire plug or this audio signal transmit.

10. changing method according to claim 7, it is characterized in that, when this transmission wire plug was this video signal transmission wire plug, this judgment signal that is produced was a low level signal, and transmission channel is to be switched to this video signal transmission passage according to this low level signal.

11. changing method according to claim 7, it is characterized in that, when this transmission wire plug was this audio signal transmission wire plug, this judgment signal that is produced was a high levels signal, and transmission channel is to be switched to this audio signal transmission passage according to this high levels signal.

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