METHOD AND DEVICE FOR PRODUCING A DIGITAL SIGNAL |
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| 申请号 | PCT/EP2014051414 | 申请日 | 2014-01-24 | 公开(公告)号 | WO2014114755A2 | 公开(公告)日 | 2014-07-31 |
| 申请人 | LENZE AUTOMATION GMBH; | 发明人 | DÜSTERBERG DIRK; STICHWEH HEIKO; | ||||
| 摘要 | The invention relates to a method for producing a digital signal (DS) from an analog signal (UA) produced by means of a frequency converter on the basis of a pulse-width modulation having a variable period duration, wherein values of the digital signal (DS) correspond to a mean of the analog signal (UA) over an associated period duration of the pulse-width modulation, comprising the following steps: producing a bit stream (BS) as a function of the analog signal (UA) by means of a sigma-delta modulator (1), wherein the bit stream is produced with a constant modulator cycle time, producing temporally successive digital sampled values (S_1 to S_r) during an associated period duration by filtering the bit stream (BS) by means of a number of digital filters (2_1 to 2_r), wherein time intervals between the temporally successive digital sampled values are multiples of the modulator cycle time, the digital filters (2_1 to 2_r) are started at time offsets from each other in the time intervals of the multiples of the modulator cycle time, and each digital filter (2_1 to 2_r) outputs an associated digital sampled value (S_1 to S_r), and calculating a mean of the digital sampled values (S_1 to S_r) produced during the associated period duration, wherein the mean forms the value of the digital signal (DS) for the associated period duration. | ||||||
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