JPH0446775U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram of a multi-scan circuit showing an embodiment of the present invention, Fig. 2 is a block diagram of a multi-scan circuit showing a conventional example, and Fig. 3 is a block diagram of a multi-scan circuit showing another conventional example. It is. 1 and 1a are scan converters that convert the RGB primary color signals of about 15 KHz of synchronous input to about 31 KHz, 3 is a video signal output section, 4 and 11 are 2 frequency divider circuits of about 31 KHz of synchronous input, 66a is a horizontal frequency discrimination circuit, 7 , 7a, 7b, 7c are horizontal oscillation times, 1
0, 10a, and 10b are horizontal deflection output sections.

Claims (1)

[Scope of utility model registration request] The input and output of a double speed scan converter with a horizontal frequency of approximately 15 KHz, which receives RGB primary color signals output from a personal computer, etc., are connected to a first switch circuit, and the output of the first switch circuit is connected to a video signal output section. the first two connected to the horizontal drive signal for the horizontal deflection circuit;
The input and output of the frequency dividing circuit are respectively connected to a second switch circuit, the output of the second switch circuit is connected to the first horizontal oscillation circuit, and the horizontal drive signal is transmitted to the horizontal frequency discrimination circuit and the second switch circuit. the output of the second horizontal oscillation circuit and the first horizontal oscillation circuit.
The outputs of the horizontal oscillation circuits are connected to a third switch circuit, the outputs of the third switch circuits are connected to the horizontal deflection output section, and the automatic frequency control signal output from the horizontal deflection output section is connected to the second half of the horizontal oscillation circuit. It feeds back to the first horizontal oscillation circuit via a loop circuit, and further outputs each of the horizontal frequency discrimination circuit outputs to the control terminals of the first and second switch circuits, the control terminal of the third switch circuit, and the horizontal The synchronization input connected to the deflection output section is approximately 15KHz, approximately 24KHz,
A television receiver that features multi-scanning that supports approximately 31KHz.