A TV signal output circuit and detection method for automatically detecting terminal connection
A terminal connection, TV signal technology, applied in the direction of TV, color TV, color TV components, etc., can solve the problems of energy consumption, signal circuit interference, etc., to achieve the effect of reducing energy consumption, reducing interference, and improving performance
Active Publication Date: 2017-07-14
HANGZHOU NATCHIP SCI & TECH
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This useless signal output consumes energy, and the signal can cause harmful interference to other parts of the circuit
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[0017] figure 1 It is a schematic diagram of the circuit structure, where dout is the digital TV signal to be output, a is the control module, b is the low-level signal, c is the signal source selection switch, d is the DAC, e is the ADC, and f is the load resistance; signal The source selection switch selects the input signal or low-level signal to the DAC according to the output of the control module; the output of the DAC is sampled by the ADC; the signal sampled by the ADC is sent to the control module; the control module generates a signal source based on the input signal and the signal sampled by the ADC Select the control signal of the switch.
[0018] figure 2 Is a schematic diagram of the waveform of a TV signal, figure 2 OH is the horizontal synchronization time base point, a is the horizontal blanking pulse, d is the horizontal synchronization pulse, and h is the chrominance subcarrier.
[0019] When a TV terminal is connected to the video output device, the equivale...
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A television signal output circuit and detection method for automatically detecting terminal connections, which at least include a digital-to-analog converter, an analog-to-digital converter, a control module, a low-level signal and a signal source selection switch; the output The digitized TV signal and the low-level signal are connected to the signal input end of the signal source selector, and the output of the control module is connected to the selection control end of the signal source selector; the output of the signal source selector is connected to the digital-to-analog converter The input end of the digital-analog converter is connected with the 75 ohm load resistance and the input end of the analog-to-digital converter; the output of the analog-to-digital converter is connected to the digital TV signal output of the control module Input terminal: the invention can automatically reduce or close such useless signals, reduce energy consumption of equipment, reduce internal interference of equipment, improve performance of equipment, and increase service life of equipment.
Description
Technical field [0001] The invention relates to a television signal output circuit for automatically detecting a terminal connection, and belongs to the technical field of television equipment. Background technique [0002] Devices with analog TV output, such as set-top boxes, DVD (digital video disc) players, etc., hereinafter referred to as devices, usually implement multiple analog TV output interfaces. The multi-channel analog TV output interface allows one device to output to multiple TV terminals at the same time. Because most users only use one TV output interface. Therefore, the TV signal output of other channels is a useless signal output. This kind of useless signal output consumes energy, and the signal will cause harmful interference to other parts of the circuit. If you can automatically reduce or turn off this useless signal, you can reduce the energy consumption of the device, reduce the interference inside the device, improve the performance of the device, and ...
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IPC IPC(8): H04N5/44
Inventor 梁骏张庆冯丽红邹代红
Owner HANGZHOU NATCHIP SCI & TECH