| 摘要 |
PURPOSE:To discriminate plural types of information data of different contents, by detecting the non-signal parts at both initiation and termination sides of a comment data which is recorded to a recording medium and informing the contents of the corresponding information data on the basis of the extracted comment data. CONSTITUTION:The on-signal parts 1Bn and 2Bn as well as 1Bn+1 and 2Bn+1 are provided on a magnetic tape 11 for each of comment data RDn and RDn+1 along with program data recording parts Cn and Cn+1 respectively. The signals reproduced by a tape recorder 12 are applied to a gate circuit 14 and a waveform shaping circuit 15. The output of an edge pulse generating circuit 19 is fed to a waveform shaping circuit 22 via an integration circuit 21. Then the non- signal parts are detected and fed to a sound detecting circuit 23. The circuit 23 sets an FF24 and opens the circuit 14. A data detecting circuit 25 detects the reproduction of a program data obtained from a demodulating circuit 20 or the output of the circuit 23 and resets and closes an FF24 and the circuit 14 respectively. Therefore only the comments data are delivered to a speaker 18 to perform an automatic discrimination of the information data. |
