Strobe timing control circuit for use in video tape recorder
AssigneeSamsung Electronics Co., Ltd.
InventorYong-Je Kim
Life of this patent
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Abstract
A circuit for varying the strobe timing of the PIP in a VTR which includes a microcomputer, first, second and third counters receiving the signal for varying the strobe timing of the microcomputer, a modulo-4 counter and logic receiving the output of the first counter, a decoder receiving the outputs of the second and third counters, a multiplexer receiving the output of the decoder, the output of the decoder being applied to the clear terminal of the second counter, a register receiving the output of the multiplexer, and a memory connected with the register. The vertical synchronizing pulse of the sub-screens is applied to the clock terminals of the first and second counters and the clock terminal of the register. The output of the microcomputer is applied to the clock terminal of the third counter.
Claims22
A circuit for controlling the strobe timing a picture-in-picture feature, comprising:
- a microcomputer;
- first, second and third counters receiving from said microcomputer a control signal for varying strobe timing;
- modulo-4 counter and logic means for receiving an output of said first counter;
- decoder means for receiving outputs of said second and third counters, and for providing an output to a clear terminal of said second counter;
- multiplexer for receiving the outputs of said decoder and said modulo-4 counter and logic means;
- register means for receiving the output of said multiplexer;
- a memory connected to be addressed with said output of said multiplexer via said register means;
- and
- means for applying vertical synchronizing pulses for sub-screens to a clock terminal of said first and second counters and a clock terminal of said register means, and an output of said microcomputer to a clock terminal of said third counter.
A strobe control circuit, comprising:
- control means for providing a control signal;
- counting means coupled to respond to said control signal, for providing in correspondence to a subscreen vertical synchronizing pulse train, a first counting signal, a second counting signal and a third counting signal;
- and
- decoding means for providing a clear signal to the counting means after providing a decoded signal by decoding said second and third counting signals.
A circuit for controlling a strobe timing of subscreens, comprising:
- first counting means for generating during a first mode, fixed time interval pulses and for generating first count values corresponding to positions of said subscreens displayed upon a main screen, in response to vertical synchronizing pulses of the subscreens;
- means for generating memory addresses corresponding to said values;
- memory means for storing said memory addresses in response to the vertical synchronizing pulses;
- second counting means for generating during a second mode, second count values corresponding to the vertical synchronizing pulses;
- third counting means for generating during said second mode, corresponding ones of a plurality of step signals in dependence upon control signals which indicate changes in said strobe timing of the subscreens;
- and
- decoder means for providing a decoded signal of said second count values and said step signals, to said means for generating addresses.
A strobe timing circuit, comprising:
- first counting means for generating during a first mode, fixed time interval pulses and for generating values corresponding to different positions of a subscreen displayed upon a main screen, in response to vertical synchronizing pulses of the subscreen;
- means for generating memory addresses corresponding to said first count values;
- memory means for storing said memory addresses corresponding to the vertical synchronizing pulses;
- second counting means for generating during a second mode, counts of the vertical synchronizing pulses;
- third counting means for generating during said second mode, corresponding ones of a plurality of step signals in dependence upon control signals which indicate changes in said strobe timing of the subscreens;
- and
- decoder means for providing a decoded signal of said second count values and said step signals, to said means for generating addresses.
Dependencies are inferred from the claim text.