公开(公告)号：US5252973A

公开(公告)日：1993-10-12

申请号：US902643

申请日：1992-06-23

申请人： Toshishiko Masuda

发明人： Toshishiko Masuda

IPC分类号： H03M1/10 ,  H03M3/02 ,  H03M7/34 ,  H03M1/20

CPC分类号： H03M7/3006 ,  H03M7/3008 ,  H03M7/3026 ,  H03M7/3042

摘要： An apparatus for digital-to-analogue conversion. A dither generator creates a noise signal which is added to a digital input signal to produce an added output. Noise shaping is performed on the added output at a noise shaping circuit. The noise shaping circuit includes a quantizer with certain threshold levels for quantizing the added signal. A digital-to-analogue (D/A) converter converts the output of the noise shaping circuit to an analog signal. A control circuit widens the threshold levels as a level of the digital input signal becomes zero, and attenuates an input signal to the digital-to-analogue converter by about 1/K times when the threshold levels are increased by K times.

摘要翻译： 一种用于数模转换的装置。 抖动发生器产生噪声信号，该噪声信号被添加到数字输入信号以产生附加的输出。 在噪声整形电路的附加输出上执行噪声整形。 噪声整形电路包括具有用于量化附加信号的某些阈值电平的量化器。 数模（D / A）转换器将噪声整形电路的输出转换为模拟信号。 当阈值电平增加K倍时，控制电路随着数字输入信号的电平变为零而加宽阈值电平，并将数模转换器的输入信号衰减大约1 / K倍。