Abstract: An adaptive comb filter for separating at least one component of a video signal includes a filter input terminal for receiving the video signal, a first delay device for delaying the video signal by a first interval to produce a first delayed video signal, a second delay device for delaying the video signal by a second interval to produce a second delayed video signal, a first signal subtractor for producing a first difference signal proportional to a difference between the video signal and the first delayed video signal, a second subtractor for producing a second difference signal proportional to a difference between the first delayed video signal and the second delayed video signal, a first signal summing device for producing a first summation signal proportional to a summation of the first difference signal and the second difference signal, a signal selecting device for controllably selecting one of the first difference signal, the second difference signal and the first summation signal as the separated co

Abstract: A semiconductor memory includes an input buffer means for storing inputted data, an output buffer means for storing the data and for outputting the data and a storage means for storing the data outputted from the input buffer means and for transferring the data to the output buffer means. The input buffer means includes a plurality of memories having equal capacity. The output buffer means also includes a plurality of memories having equal capacity. The memory means have memory capacity of a divisor of memory capacity per line of the storage means. In addition, the semiconductor memory can also include a dividing means for dividing image data outputted from said input buffer into smaller data units to be written on said storage means and a recombining means for said smaller data units outputted from said storage means to supply to said output buffer means.

Abstract: A video memory, for use with a video tape recorder, a television receiver of the like to process a picture, is simplified and can achieve the functions of a time base corrector, a noise reducer and a comb filter, so as to considerably improve the quality of a video picture. A frequency converting circuit for use with the video memory includes a comparator for comparing first and second address signals and an address correction circuit connected to receive an output signal from the comparator. When a crossing occurs between the first and second address signals, the sequential order in which an address signal is supplied to the memory is switched by the address correcting circuit, to thereby derive a continuous output signal from the memory.

Abstract: A digital scan converter having an oscillator providing a clock signal used to scan-convert an input video signal to thereby produce a scan-converted output video signal, an automatic frequency control for controlling the oscillator in synchronism with a synchronizing signal separated from the input video signal and a counter for frequency-dividing the clock signal from the oscillator to thereby form a control signal used for controlling blanking of the input video signal. The counter also provides an address signal for a memory in which the video signal is temporarily stored during the scan converting operation. Since a composite blanking pulse for the input video signal is formed in synchronism with the address signal for the memory, it is possible to prevent appearance of a jitter of the composite blanking pulse on a display screen.

Abstract: A synchronous detector for detecting an information signal modulated onto a carrier, such as a video IF signal, is disclosed in which there are provided a circuit for supplying the modulated information signal in the form of a vestigial sideband signal, a filter circuit coupled to the supplying circuit which includes a tuning circuit tuned to the frequency of the carrier on which the information signal is modulated, an emitter follower circuit connected to the output of the filter circuit, a limiter circuit connected to the filter circuit, for producing a switching carrier, and a multiplier having first and second input terminals coupled to the output of the limiter circuit and to the supplying circuit, for multiplying the modulated information signal and the switching carrier to obtain said information signal.