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    Apparatus for synthesizing analog signals in PCM
    1.
    发明公开
    Apparatus for synthesizing analog signals in PCM 失效
    用于合成PCM中的模拟信号的装置

    公开(公告)号：EP0337458A3

    公开(公告)日：1990-11-28

    申请号：EP89106631.8

    申请日：1989-04-13

    申请人： NAMCO, LTD.

    发明人： Ogawa, Toru ,  Sato, Seiichi

    IPC分类号： G10H7/00 ,  G10H7/08 ,  G10H1/12

    CPC分类号： G10H7/00 ,  G10H2250/195 ,  G10H2250/545 ,  Y10S84/09

    摘要： The present invention provides an analog signal synthesizing apparatus including a waveform memory for storing a plurality of analog signals as PCM data sampled with different sampling frequencies, the amount of PCM data corresponding to plural channels being read from the waveform memory and used to synthesize the analog signals. The analog signal synthesizing apparatus includes an oversampling device for shifting the sampling frequency of said PCM data read from said waveform memory for each channel toward the side of high frequency; a summing device for summing the oversampled PCM data for the respective channel; a D/A converter for converting the summed data into an analog signal; and a low-pass filter for setting a cut-off frequency based on the sampling frequency shifted to the side of high frequency and for eliminating aliasing noises included in the PCM data from the synthesized analog signal. The elimination of the aliasing noise included in the PCM data for each channel is carried out at the common low-pass filter.

    Apparatus for synthesizing analog signals in PCM
    2.
    发明公开
    Apparatus for synthesizing analog signals in PCM 失效
    Vorrichtung zur Synthese von analogen Signalen in PCM。

    公开(公告)号：EP0337458A2

    公开(公告)日：1989-10-18

    申请号：EP89106631.8

    申请日：1989-04-13

    申请人： NAMCO, LTD.

    发明人： Ogawa, Toru ,  Sato, Seiichi

    IPC分类号： G10H7/00 ,  G10H7/08 ,  G10H1/12

    CPC分类号： G10H7/00 ,  G10H2250/195 ,  G10H2250/545 ,  Y10S84/09

    摘要： The present invention provides an analog signal synthesizing apparatus including a waveform memory for storing a plurality of analog signals as PCM data sampled with different sampling frequencies, the amount of PCM data corresponding to plural channels being read from the waveform memory and used to synthesize the analog signals. The analog signal synthesizing apparatus includes an oversampling device for shifting the sampling frequency of said PCM data read from said waveform memory for each channel toward the side of high frequency; a summing device for summing the oversampled PCM data for the respective channel; a D/A converter for converting the summed data into an analog signal; and a low-pass filter for setting a cut-off frequency based on the sampling frequency shifted to the side of high frequency and for eliminating aliasing noises included in the PCM data from the synthesized analog signal. The elimination of the aliasing noise included in the PCM data for each channel is carried out at the common low-pass filter.

    摘要翻译： 本发明提供了一种模拟信号合成装置，包括：波形存储器，用于存储多个模拟信号作为以不同采样频率采样的PCM数据，对应于多个通道的PCM数据量从波形存储器读取并用于合成模拟信号 信号。 模拟信号合成装置包括：过采样装置，用于将每个信道的所述波形存储器读出的所述PCM数据的采样频率向高频侧移位; 用于对相应信道的过采样PCM数据求和的求和装置; D / A转换器，用于将求和的数据转换为模拟信号; 以及低通滤波器，用于基于偏移到高频侧的采样频率设置截止频率，并且用于消除来自合成模拟信号的PCM数据中包含的混叠噪声。 在公共低通滤波器中执行每个信道的PCM数据中包含的混叠噪声的消除。