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1. 发明授权

US4107669A Apparatus for analog to digital conversion 失效
标题翻译：用于模数转换的装置
公开(公告)号：US4107669A
公开(公告)日：1978-08-15
申请号：US756539
申请日：1977-01-03
申请人： Stuart Keene Tewksbury
发明人： Stuart Keene Tewksbury
IPC分类号： H03M3/02 , G06T9/00 , H03M3/04 , H04B14/06 , H03K13/01
CPC分类号： H03M3/04 , G06T9/004
摘要： An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are weighted by coefficients a.sub.i . . . a.sub.n selected according to the relationship ##EQU1## AND THEN SUMMED. Alternatively, the feedback loop may comprise a chain of n integrators arranged so that the signal fed back to the comparator is the sum of single, double, triple . . . n order integration. By so doing, the coder attenuates the signal power at the quantizer input while the attenuator coefficients are independent of the input signal statistics.A similar technique may also be applied in an oversampled error feedback coder, which includes a feedback loop having an n stage delay line. Here again, the delay line outputs are weighted in accordance with the above relationship. Alternatively, a chain of n integrators may be used in the coder input, and an identical chain employed in the feedback loop. By so doing, the coder attenuates the coding noise power in the signal band while the coder design is rendered independent of the quantizing error statistics.
摘要翻译：输入模拟信号由过采样的预测DPCM编码器转换为数字输出信号，该编码器在反馈回路中包括n级延迟线。 n个延迟线输出由系数ai加权。。。根据和之后的关系选择。或者，反馈回路可以包括一组n个积分器，其被布置成使得反馈到比较器的信号是单次，双倍，三次的总和。。。 n阶整合。通过这样做，编码器在量化器输入端衰减信号功率，而衰减器系数独立于输入信号统计。

2. 发明授权

US4071842A Apparatus for analog to digital conversion 失效
标题翻译：用于模数转换的装置
公开(公告)号：US4071842A
公开(公告)日：1978-01-31
申请号：US756399
申请日：1977-01-03
申请人： Stuart Keene Tewksbury
发明人： Stuart Keene Tewksbury
IPC分类号： H03M3/02 , G06T9/00 , H03M3/04 , H04B14/06 , H03K13/22
CPC分类号： H03M3/04 , G06T9/004
摘要： An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are weighted by coefficients a.sub.i . . . a.sub.n selected according to the relationship ##EQU1## AND THEN SUMMED. Alternatively, the feedback loop may comprise a chain of n integrators arranged so that the signal fed back to the comparator is the sum of single, double, triple...n order integration. By so doing, the coder attenuates the signal power at the quantizer input while the attenuator coefficients are independent of the input signal statistics.A similar technique may also be applied in an oversampled error feedback coder, which includes a feedback loop having an n stage delay line. Here again, the delay line outputs are weighted in accordance with the above relationship. Alternatively, a chain of n integrators may be used in the coder input, and an identical chain employed in the feedback loop. By so doing, the coder attenuates the coding noise power in the signal band while the coder design is rendered independent of the quantizing error statistics.
摘要翻译：输入模拟信号由过采样的预测DPCM编码器转换为数字输出信号，该编码器在反馈回路中包括n级延迟线。 n个延迟线输出由系数ai加权。。。根据的关系选择

3. 发明授权

US4017849A Apparatus for analog to digital conversion 失效
标题翻译：用于模数转换的装置
公开(公告)号：US4017849A
公开(公告)日：1977-04-12
申请号：US608524
申请日：1975-08-28
申请人： Stuart Keene Tewksbury
发明人： Stuart Keene Tewksbury
IPC分类号： H03M3/02 , G06T9/00 , H03M3/04 , H04B14/06 , H03K13/22
CPC分类号： H03M3/04 , G06T9/004
摘要： An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are weighted by coefficients a.sub.i. . . a.sub.n selected according to the relationship ##EQU1## AND THEN SUMMED. Alternatively, the feedback loop may comprise a chain of n integrators arranged so that the signal fed back to the comparator is the sum of single, double, triple . . . n order integration. By so doing, the coder attenuates the signal power at the quantizer input while the attenuator coefficients are independent of the input signal statistics.A similar technique may also be applied in an oversampled error feedback coder, which includes a feedback loop having an n stage delay line. Here again, the delay line outputs are weighted in accordance with the above relationship. Alternatively, a chain of n integrators may be used in the coder input, and an identical chain employed in the feedback loop. By so doing, the coder attenuates the coding noise power in the signal band while the coder design is rendered independent of the quantizing error statistics.
摘要翻译：输入模拟信号由过采样的预测DPCM编码器转换为数字输出信号，该编码器在反馈回路中包括n级延迟线。 n个延迟线输出由系数ai加权。。。根据的关系选择

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