| 摘要 |
PCT No. PCT/FI93/00027 Sec. 371 Date Aug. 11, 1994 Sec. 102(e) Date Aug. 11, 1994 PCT Filed Jan. 28, 1993 PCT Pub. No. WO93/15557 PCT Pub. Date Aug. 5, 1993The invention relates to a method for cascading two or more feedforward-type sigma-delta modulators, and a modulator system comprising at least two cascaded modulators (1, 2). According to the invention, each subsequent modulator (2) in the cascade quantizes the integrated signal estimate error (e) of the preceding modulator (1), the quantized error (e') is differentiated (3) and subtracted (6) from the quantized output signal (D'') of the preceding modulator (1).
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