公开(公告)号：US4899146A

公开(公告)日：1990-02-06

申请号：US285092

申请日：1988-12-16

申请人： J. B. Podolak ,  Ronald B. Saluski

发明人： J. B. Podolak ,  Ronald B. Saluski

IPC分类号： G11B20/10

CPC分类号： G11B20/10

摘要： A method of and apparatus for converting between first and second digital data formats is disclosed whereby digital words of the first format are analyzed to detect an upper bandwidth limit of a corresponding analog signal in an interval thereof defined by such words and to determine the level of the analog signal at the beginning of such interval. A digital word of the second format is encoded with first and second pluralities of bits representing the determined upper bandwidth limit and the level of the corresponding analog signal at the beginning of the interval.

摘要翻译： 公开了一种用于在第一和第二数字数据格式之间进行转换的方法和装置，其中分析第一格式的数字字以在由这些字定义的间隔中检测对应的模拟信号的上限带宽，并确定 在这种间隔开始时的模拟信号。 第二格式的数字字用表示确定的上限带宽限制的第一和第二多个比特和在间隔开始处的相应模拟信号的电平进行编码。

公开(公告)号：US4816829A

公开(公告)日：1989-03-28

申请号：US44238

申请日：1987-04-30

申请人： J. B. Podolak ,  Ronald B. Saluski

发明人： J. B. Podolak ,  Ronald B. Saluski

IPC分类号： G11B20/10 ,  H03M5/10

CPC分类号： G11B20/10

摘要： A method of and apparatus for converting between first and second digital data formats is disclosed whereby digital words of the first format are analyzed to detect an upper bandwidth limit of a corresponding analog signal in an interval thereof defined by such words and to determine the level of the analog signal at the beginning of such interval. A digital word of the second format is encoded with first and second pluralities of bits representing the determined upper bandwidth limit and the level of the corresponding analog signal at the beginning of the interval.

摘要翻译： 公开了一种用于在第一和第二数字数据格式之间进行转换的方法和装置，其中分析第一格式的数字字以在由这些字定义的间隔中检测对应的模拟信号的上限带宽，并确定 在这种间隔开始时的模拟信号。 第二格式的数字字用表示确定的上限带宽限制的第一和第二多个比特和在间隔开始处的相应模拟信号的电平进行编码。

公开(公告)号：US4763207A

公开(公告)日：1988-08-09

申请号：US941205

申请日：1986-12-12

申请人： J. B. Podolak ,  Douglas R. Adler ,  Ronald B. Saluski

发明人： J. B. Podolak ,  Douglas R. Adler ,  Ronald B. Saluski

IPC分类号： G11B20/10 ,  H03M1/12 ,  G11B5/09 ,  H03M1/00

CPC分类号： G11B20/10527 ,  H03M1/127

摘要： There is disclosed herein a method of and system for reproducing an analog signal using digital techniques. The system includes means for encoding the analog signal in digital form and means for decoding the encoded analog signal. The encoding means includes means for detecting the upper bandwidth limit of the input analog signal during each of a plurality of successive sample intervals. Means coupled to the detecting means are included for sampling the input analog signal at a sampling rate determined in accordance with the detected upper bandwidth limits to derive a series of voltage levels which together define a sampled approximation of the input analog signal. Means are coupled to the sampling means for converting each voltage level and the sampling rate at which such voltage level was derived into digital signals. Also included are means for detecting when the input analog signal is at substantially a zero level, means for developing a digital indication of the length of time the signal is at such level and means for combining the digital indication with the digital signals to develop a digital representation of the input analog signal. The decoding means includes means for sequentially retrieving the digital signals, means coupled to the retrieving means for converting the digital signals into the sampled approximation of the input analog signal and a low-pass filter coupled to the converting means having a cut-off frequency determined in accordance with the encoded sampling rate for filtering the sampled approximation to reproduce the input analog signal.

摘要翻译： 这里公开了使用数字技术再现模拟信号的方法和系统。 该系统包括用于对数字形式的模拟信号进行编码的装置和用于对编码的模拟信号进行解码的装置。 编码装置包括用于在多个连续采样间隔的每一个期间检测输入模拟信号的上限带宽的装置。 包括耦合到检测装置的装置用于以根据检测到的上限带宽确定的采样速率对输入的模拟信号进行采样，以导出一系列电压电平，这些电压电平共同限定了输入模拟信号的采样近似。 装置耦合到采样装置，用于将每个电压电平和将该电压电平导出的采样率转换成数字信号。 还包括用于检测输入模拟信号何时基本上为零电平的装置，用于开发信号处于这种电平的时间长度的数字指示的装置，以及用于将数字指示与数字信号组合以形成数字信号的装置 表示输入模拟信号。 解码装置包括用于顺序检索数字信号的装置，耦合到检索装置的装置，用于将数字信号转换为输入模拟信号的采样近似值;以及耦合到转换装置的低通滤波器，其具有确定的截止频率 根据用于滤波采样近似的编码采样率来再现输入的模拟信号。