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    Signal identification
    2.
    发明公开
    Signal identification 失效
    信号识别

    公开(公告)号：EP0245037A3

    公开(公告)日：1990-03-28

    申请号：EP87303889.7

    申请日：1987-04-30

    申请人： THORN EMI PLC

    发明人： Best, Stuart John ,  Willard, Reginald Alfred

    IPC分类号： H04H1/00

    CPC分类号： H04H20/31

    摘要： Equipment for labelling audio signals with identification information has an encoder which inserts the binary information into two very narrow notches of centre frequencies 2883 and 3417 Hz, between semi-tones in the tonic scale to minimise music breakthrough into the decoding circuits, and to ensure that no fundamental frequencies in the tonic scale will be excluded in the reproduction. The notches are derived from a 3-stage biquad filter, and are approximately 50 dB deep and 150 Hz wide at the top. The encoder includes a wide bandpass circuit consisting of a 1 KHz highpass filter 10 and a 6 KHz lowpass filter 11 introduced to ensure that the code insertion level is not determined by frequencies, either high or low, which do not adequately mask the code frequencies. The code amplitude is kept a fixed level below the programme, initially adjustable by a suitable control. The code sequence has an addressing pre-amble consisting of a simultaneous burst of both the lower and higher frequencies for a period of 8 digits, followed by a message portion of 40 bits formed of an appropriate stream of the two frequencies.

    Signal identification
    3.
    发明公开
    Signal identification 失效
    信号Identifikation。

    公开(公告)号：EP0245037A2

    公开(公告)日：1987-11-11

    申请号：EP87303889.7

    申请日：1987-04-30

    申请人： THORN EMI PLC

    发明人： Best, Stuart John ,  Willard, Reginald Alfred

    IPC分类号： H04H1/00

    CPC分类号： H04H20/31

    摘要： Equipment for labelling audio signals with identification information has an encoder which inserts the binary information into two very narrow notches of centre frequencies 2883 and 3417 Hz, between semi-tones in the tonic scale to minimise music breakthrough into the decoding circuits, and to ensure that no fundamental frequencies in the tonic scale will be excluded in the reproduction. The notches are derived from a 3-stage biquad filter, and are approximately 50 dB deep and 150 Hz wide at the top.
    The encoder includes a wide bandpass circuit consisting of a 1 KHz highpass filter 10 and a 6 KHz lowpass filter 11 introduced to ensure that the code insertion level is not determined by frequencies, either high or low, which do not adequately mask the code frequencies.
    The code amplitude is kept a fixed level below the programme, initially adjustable by a suitable control.
    The code sequence has an addressing pre-amble consisting of a simultaneous burst of both the lower and higher frequencies for a period of 8 digits, followed by a message portion of 40 bits formed of an appropriate stream of the two frequencies.

    摘要翻译： 用识别信息标记音频信号的设备具有编码器，其将二进制信息插入中心频率2883和3417Hz的两个非常窄的凹口中，在音量表中的半音之间，以最小化音乐突破进入解码电路，并确保 补品中没有基本频率将被排除在复制品中。 凹口衍生自3级双二阶滤波器，顶部约为50 dB深，150 Hz宽。 编码器包括一个宽带通电路，由一个1KHz高通滤波器10和一个6KHz低通滤波器11组成，该低通滤波器11被引入以确保代码插入电平不由高或低的频率确定，这些频率不能充分掩盖码频。 代码幅度保持在程序以下的固定水平，最初由适当的控件可控。 代码序列具有寻址前同步码，其包括8位数字的低频和高频同时脉冲串，随后是由两个频率的适当流形成的40位的消息部分。