Signal generator for generating an image signal of an input signal
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United States of America Patent
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Jun 16, 1992
Issued Date -
N/A
app pub date -
Feb 14, 1990
filing date -
Aug 26, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal generator for generating an output signal that is an accurate image of an input signal. A keyboard transmits an input signal and an image controlling device receives the input signal. The image controlling device includes a level variation detecting device which samples the input signal at a sampling rate determined by a sampling period generating device. When the level variation detecting device detects a variation in the levels of a currently sampled value and a previously sampled value it adjusts the image signal accordingly so that the output signal is an accurate image of the input signal. A synchronization signal transmitter transmits a synchronization signal to the keyboard. The keyboard includes a counter which counts the synchronization signal. The counter generates the input image signal that is transmitted to the image controlling device. The synchronization signal transmitter provides synchronization between the image signal and the sampling device so that level variations in the input signal are designed to change in synchronization with the sampling rate. Accordingly, the level variation detecting device can detect any level variations in the input signal accurately.
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