Digital filter device
专利汇可以提供Digital filter device专利检索，专利查询，专利分析的服务。并且PURPOSE:To obtain a steep noise shaping characteristic by a simple circuit constitution, and also, to improve an S N ratio in a necessary band, by using an IIR (infinite impulse response) filter, as a filter for applying a noise shaping processing to a digital signal which has been brought to over-sampling. CONSTITUTION:In a noise shaping filter 20, a signal X(z) which has been supplied to an input terminal 21 is sent to a quantizer 23 through an adder 22 and requantized, and sent to an output terminal 24. By subtracting from an output of the quantizer 23 its input, what is called a quantizing error or a quantizing noise E(z) is formed, and this error or the noise E(z) is sent as a subtracting signal to the adder 22 through a circuit part consisting of an adder 26, predictors 27, 28 and an adder 29, and a noise shaping characteristic is obtained as a whole. Said circuit part consisting of the adder 26, the predictors 27, 28 and the adder 29 has a constitution of a kind of what is called IIR (infinite impulse response) filter having a a zero point and a pole in a transfer characteristic.，下面是Digital filter device专利的具体信息内容。
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