公开(公告)号：CA1284679C

公开(公告)日：1991-06-04

申请号：CA535922

申请日：1987-04-29

Applicant: IBM

Inventor： GALAND CLAUDE ,  VERMOT-GAUCHY ROBERT ,  ROULIER GUY ,  CERF-DANON HELENE

IPC: H04L27/00 ,  H04L27/26 ,  H04Q1/457 ,  H04M1/00

Abstract: TONE DETECTION PROCESS AND DEVICE FOR IMPLEMENTING SAID PROCESS The process is made to detect a received tone including at least one single predetermined frequency, within a signal encoded using block coding and Linear Prediction Coding techniques providing auto-correlation coefficients R(i) and direct form coefficients a(i). The process is based upon Fourier Transform computations over the successive blocks of a(i)'s, with table look up tone identification, further confirmed upon R(i)'s stationarity detecting.

公开(公告)号：DE3678717D1

公开(公告)日：1991-05-16

申请号：DE3678717

申请日：1986-04-30

Applicant: IBM

Inventor： GALAND CLAUDE ,  ROULIER GUY ,  VERMOT-GAUCHY ROBERT ,  CERF-DANON HELENE

IPC: H04L27/00 ,  H04L27/26 ,  H04Q1/457

Abstract: The process is made to detect a received tone including at least one single predetermined frequency, within a signal encoded using block coding and Linear Prediction Coding techniques providing auto-correlation coefficients R(i) and direct form coefficients a(i). The process is based upon Fourier Transform computations over the successive blocks of a(i)'s, with table look up tone identification, further confirmed upon R(i)'s stationarity detecting.