| 摘要 |
In a scrambling system for an audio frequency signal, an audio signal is divided into blocks, each block being formed of a plurality of frames (f3, f4), the frames (f3, f4; g1, g2) are re-arranged on a time-base in a predetermined order within every block so as to be encoded, and the encoded signal is re-arranged on the time-base in the original order so as to be decoded. A first signal processing circuit (15, 16) inserts a redundant portion (r1, r2) between adjoining frames (g1, g2) and time-base compresses the frames (g1, g2) upon encoding, a control signal generating circuit (21) inserts a control signal (CL) into the redundant portions (r1, r2), a control signal detecting circuit (37) detects the control signal (CL) upon decoding, and a second signal processing circuit (32, 33) removes the redundant portions (r1, r2) and time-base expands the frames (g2, g2). |
