JPS5698979A - Still picture broadcast receiver - Google Patents

Abstract

PURPOSE:To obtain a still picture easily with simple constitution, by generating a frame pulse, whose subcarrier is shifted by a half cycle in response to every frame pulse obtained from an 8/5 color subcarrier frequency by making use of the frame pulses. CONSTITUTION:Clock pulse generating circuit 1 generates the 1st clock pulse string whose phase synchronizes with a digital control signal, and subcarrier generating circuit 2 generates a clock pulse string greater than the color carrier of an analog still picture signal by odd-number times. Further, video clock pulse generating circuit 5 generates pulses of three-fold fsc and A/D converter 6 converts the still picture signal into a digital signal, which is stored in frame memory 7. Further, frame memory control circuit 4 detects frame pulses synchronizing with 8/5 fsc of reception control circuit 3 to generate frame pulses whose subcarrier is shifted by a half cycle in response to every said frame pulse, and the digitized signal stored in memory 7 is read into D/A converter 8 to output a still picture signal converted into an analog signal.