H - Electricity – 04 – K
Patent
H - Electricity
04
K
352/19, 325/3, 3
H04K 1/06 (2006.01)
Patent
CA 1216632
ABSTRACT OF THE DISCLOSURE A scrambling system for an audio frequency signal in which an audio signal is divided into blocks, each block being formed of a plurality of frames, the plurality of frames are rearranged on a timebase in a predetermined order at every block so as to be encoded and the encoded signal is re-arranged on the timebase in an original order so as to be decoded, in which there are provided a first signal processing circuit for inserting a redundant portion into a portion between adjoining frames and timebase- compressing the frames in response to the redundant portions upon encoding, a control signal generating circuit for inserting a control signal other than an audio information into the redundant portions, a control signal detecting circuit for detecting the control signal upon decoding and a second signal processing circuit for removing the redundant portions in synchronism with the detected control signal and timebase-expanding the frames in response to the redundant portions. Therefore, even when the audio signal is trans- mitted through a system in a transmission path having a timebase fluctuation such as a transmission path of a VTR (video tape recorder) and the like the frequency band region of which is restricted, the signal waveform is not distorted and a noise is not mixed therein so that the scrambling communication having high quality and high reliability can be presented.
442753
Fukami Takeshi
Komatsubara Michimasa
Sakamoto Akira
Toyoshima Masakatsu
Waku Toshihiko
Gowling Lafleur Henderson Llp
Sony Corporation
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