| 摘要 |
<p>PURPOSE:To make picture and sound recording of the broadcasting of a program only which do not contain any commercial message, by extracting and discriminating a commercial start and end signals. CONSTITUTION:In the sound recording sections of the first and last frames of a commercial film, a signal of frequency f1 which indicates the start of the commercial and a signal of frequency f2 which indicates the end of the commercial are recorded, respectively. When the commercial program is transmitted, a signal f1 passes a BPF and inputted into an integrating circuit INTS, and thus, an FF is set. When the FF is set, running of a video tape VTP is stopped and recording of pictures and sounds of the commercial program is interrupted. When the signal of the last frame is transmitted, the signal f2 passes through a filter BPFE and impressed upon an integrating circuit INTE, and thus, the FF is reset. When the FF is reset, running of the tape VTR is restarted and recording of the program broadcasting is again started.</p> |
