公开(公告)号：FR2397699A1

公开(公告)日：1979-02-09

申请号：FR7819403

申请日：1978-06-20

Applicant: IBM

Inventor： CARRUBBA FRANCIS P ,  DANIELS WALTER E JR ,  FRANASZEK ET PETER A

IPC: G10L21/00 ,  G11B20/00 ,  G11B20/10 ,  G11B27/00 ,  H03M3/02 ,  H04B1/66 ,  G10L1/00 ,  H03K13/22

Abstract: A method of and apparatus for time compression and changing the readout speed of a delta modulation encoded audio signal. The encoded audio signal has portions selectively deleted therefrom in accordance with detected zero crossovers of the same sign which occur in a predetermined timing sequence. The encoded audio signal which has had portions selectively deleted therefrom is decoded, with the undeleted decoded portions being joined. The undeleted portions have the same gain factor where joined, thereby eliminating step transients.