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1.发明授权Modulator with numerical operation for voice-frequency telegraphy and similar signals 失效具有数字操作的调制解调器，用于语音电视和类似信号
公开(公告)号：US3920917A
公开(公告)日：1975-11-18
申请号：US44634074
申请日：1974-02-27
Applicant: TELECOMMUNCATIONS CIT ALCATEL
Inventor： ROY MARIE-ANNICK
CPC classification number: H04L27/122 , H04J1/14 , H04L5/06
Abstract: A modulator effects a series of filtering operations on successively scanned telegraphic signal channels. For this purpose a scanner scans the telegraphic signal channels and provides an output to a digital filter having a series of filter sections which are supplied with signals according to prescribed filter coefficients. These coefficients are stored in memories to be applied to the filter sections depending upon the state of each channel at the time it is scanned. The output of the digital filter is converted into analog format for transmission.
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