| 摘要 |
A device for digitally shaping the quantization noise of an N-bit digital signal, N being a positive integer, comprises: a register for masking out selected bits of the N-bit digital signal to produce an M-bit digital signal, M being a positive integer less than N; a digital noise-shaping coder, coupled to the register, for shaping the quantization noise of the masked out bits; and an accumulator, coupled to the register and the coder, for accumulating the digital signals received from the register and the coder. Likewise, a method of digitally shaping the quantization noise of an N-bit digital signal, N being a positive integer, comprises the steps of: masking selected bits of an N-bit digital signal to produce an M-bit digital signal, M being a positive integer less than N; digitally coding the masked bits of the N-bit digital signal to produce a B-bit digital signal, B being a positive integer less than N-M; and accumulating the M-bit digital signal and the B-bit digital signal.
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