公开(公告)号：US4573188A

公开(公告)日：1986-02-25

申请号：US685756

申请日：1984-12-24

Applicant: Sidney W. Lewinter

Inventor： Sidney W. Lewinter

IPC: G06J1/00 ,  G10L1/00

CPC classification number: G06J1/00 ,  H03M1/0641 ,  H03M1/68 ,  H03M1/74

Abstract: Techniques are disclosed for converting a multibit digital data word into a corresponding analog signal. The converter of the present invention utilizes information in a received signal plus noise associated with the information in such a manner as to reduce the mean squared error in the generated analog signal. The actual voltage associated with each bit position in the digital word is measured. In addition, a measurement of the signal-to-noise ratio is made. From these two measurements a processing device is adapted to generate a value corresponding to the statistical probability that the detected voltage level for each bit is a logical one. The probability values are used as scaling factors to modify the weights to be given each bit during the normal digital to analog conversion process.

Abstract translation: 公开了用于将多位数字数据字转换成对应的模拟信号的技术。 本发明的转换器以这样的方式利用接收信号加上与该信息相关的噪声的信息，以减小所产生的模拟信号的均方误差。 测量与数字字中每个位位置相关的实际电压。 另外，进行信噪比的测定。 从这两个测量中，处理装置适于产生对应于每个位的检测电压电平为逻辑1的统计概率的值。 在通常的数模转换过程中，将概率值用作缩放因子来修改给定每个位的权重。

公开(公告)号：US4499594A

公开(公告)日：1985-02-12

申请号：US386836

申请日：1982-06-10

Applicant: Sidney W. Lewinter

Inventor： Sidney W. Lewinter

IPC: G06J1/00 ,  H03M1/00 ,  G10L1/00

CPC classification number: G06J1/00 ,  H03M1/74

Abstract: In this pcm digital-to-analog converter, a probability value (soft decision), rather than the conventional one/zero value (hard decision), is given each sampled input of signal-plus-noise as a function of signal-to-noise ratio, thereby reducing the mean squared error in the output analog signal.

Abstract translation: 在该pcm数模转换器中，将信号加噪声的每个采样输入作为信号到模拟转换器的函数给出概率值（软判决）而不是常规的一/零值（硬判决） 噪声比，从而降低输出模拟信号的均方误差。