公开(公告)号：DE3689923T2

公开(公告)日：1995-01-05

申请号：DE3689923

申请日：1986-03-11

Applicant: IBM

Inventor： JONES GARDNER ,  LARSEN LARRY DONALD ,  ESTEBAN DANIEL J

IPC: G06F9/48 ,  G06F9/38 ,  G06F17/10 ,  G06F15/31

公开(公告)号：DE3269710D1

公开(公告)日：1986-04-10

申请号：DE3269710

申请日：1982-11-23

Applicant: IBM

Inventor： JONES GARDNER

IPC: H04J3/12 ,  H04J3/16 ,  H04J3/24 ,  H04M11/06 ,  H04Q11/04

Abstract: Digital data is inserted in quiet or "no speech" portions of the PCM encoded voice signal stream when such quiet periods are detected. The digital data is encoded in a two byte pattern in which the scaling bits (VUT) are set high and the sign bit (S) alternates in each eight bit byte. Four bits of each byte are thus reserved for scaling and sign purposes, but the remaining four bits (d7-d4 and d3-d0) are available for data transmission. Setting the three PCM scaling bits high and alternating the sign bit has the effect of indicating to the receiver that voice is not present. Recognition of such a signal by the receiver permits a detector to block the output at a speech terminal and to strip the scale bits from the input two byte patterns and pass the remaining bits as data to a data output.

公开(公告)号：DE3689923D1

公开(公告)日：1994-07-28

申请号：DE3689923

申请日：1986-03-11

Applicant: IBM

Inventor： JONES GARDNER ,  LARSEN LARRY DONALD ,  ESTEBAN DANIEL J

IPC: G06F9/48 ,  G06F9/38 ,  G06F17/10 ,  G06F15/31