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    • 2. 发明授权
    • Scrambling system for audio frequency signals
    • 音频信号加扰系统
    • US4600941A
    • 1986-07-15
    • US560957
    • 1983-12-13
    • Akira SakamotoToshihiko WakuTakeshi FukamiMasakatsu ToyoshimaMichimasa Komatsubara
    • Akira SakamotoToshihiko WakuTakeshi FukamiMasakatsu ToyoshimaMichimasa Komatsubara
    • H04K1/06H04N7/167
    • H04K1/06
    • 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 transmitted 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.
    • 一种用于音频信号的音频信号的加扰系统,其中音频信号被分成多个块,每个块由多个帧形成,所述多个帧在每个块上以预定顺序在时基上重新排列,以被编码; 编码信号以原始顺序重新排列在时基上以被解码,其中提供了第一信号处理电路,用于将冗余部分插入相邻帧之间的部分,并响应于时基而压缩帧 编码后的冗余部分,用于将除音频信息之外的控制信号插入到冗余部分中的控制信号生成电路,用于在解码时检测控制信号的控制信号检测电路和用于去除冗余部分中的冗余部分的第二信号处理电路 与检测到的控制信号同步并响应于冗余部分对时基进行扩展。 因此,即使音频信号通过具有时频波动的传输路径的系统发送,例如VTR(录像机)的传输路径等,其频带区域被限制,信号波形也不会 失真并且不混合噪声,从而可以呈现具有高质量和高可靠性的扰频通信。