SATELLITE BROADCAST RECEIVER

• Main Author: NONAKA SATOSHI
• Format: Patent
• Language: English
• Published: 23.04.1993
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE:To attain a satisfactory reception even at the time of the deterioration in C/N or the like. CONSTITUTION:A video signal is supplied to a subtracter 5, a signal from the subtracter 5 is taken out by an output terminal 6, the signal from the subtracter 5 is supplied to, for example, a 15Hz band pass filter 7, and triangle wave components due to an energy diffusion in the received signal (video signal) are extracted. The extracted triangle wave components are supplied to a waveform shaping circuit 8, and a shaped triangle wave signal is supplied to a phase control circuit 9. And also, the video signal is supplied to a band pass filter 10 equivalent to the band pass filter 7, and a signal from the band pass filter 10 is supplied to a phase comparator circuit 11, and phase-compared with the triangle wave signal from the waveform shaping circuit 8. Then, phase difference information from the phase comparator circuit 11 is supplied to the phase control circuit 9, and the triangle wave signal whose phase is controlled is supplied through an invertor 12 to the subtracter 5, so that the triangle wave components due to the energy diffusion can be removed.