TH9890EX - "Vertical synchronization signal measuring device" - Google Patents

Abstract

The vertical pulse-synchronized measuring device consists of Non-rotating display up / down and comparator The level counter provides a signal sample. Synchronize the elements at the sampling rate. The counting device has a numerical output signal. Which will increase It responds to the measurement of such levels during the sample interval and will decrease with no response. The level was measured during the sample period. The comparator generates a vertical sync pulses when the numerical output of the counter is greater than the reference value to set up the hysteresis.The numerical value is one of the alternating values of the reference count. First and second value Reference count value The first value is greater than the second reference count. The comparator will begin to sync the measuring pulse vertically when the counter's output signal increases above the first reference count. And will make pulses Measurement of vertical sync ended. When the numerical output signal of the counting device falls below Second reference count value The numerical reference count paid to the comparator will be changed. At the rhythm corresponding to the start and finish of the measured pulses, each pulse is synced vertically. A pulse-shaped circuit may consist of Latches for sampling the output signal of the device. Compare and generate vertical synchronization signals.

Claims (1)

1.Video signal synchronous pulse measuring device, which consists of Counter for sampling the level of the input signal periodically including pulse synchronization. The counter has a numerical output signal that changes in the outside in response to the The measurement of the level during the sample interval and, on the contrary, is non-responsive to the measurement of that level during the sample interval and the comparator for generating the sync pulse is the output signal. Relationship