公开(公告)号：DE3883519D1

公开(公告)日：1993-09-30

申请号：DE3883519

申请日：1988-03-08

Applicant: IBM

Inventor： BOTTAU FRANCOISE ,  GALAND CLAUDE ,  ROSSO MICHELE

IPC: G10L19/06 ,  G10L19/12 ,  G10L9/14

Abstract: The voice signal s(n) is filtered through a short-term predictive filter (13) tuned with PARCOR derived coefficients computed over a pre-emphasized s(n), said filter (13) providing a short-term residual r(n). Said r(n) signal is then processed through a first Code-Excited/Long-Term Predictive coder providing first couples of table address and gain data (k1, g1)'s. An error signal r min (n) is then derived by subtracting coded/decoded data from uncoded data. Then said error signal is processed through a second Code-Excited/ Long-Term Predictive coder providing second couples of data (k2, g2)'s. Full rate coding is achieved by multiplexing both couples (k1, g1)'s and (k2, g2)'s into a multi-rate frame; while switching to a lower rate is achieved through a mere delation of (g2, k2)'s from the full rate frame.

公开(公告)号：DE3871369D1

公开(公告)日：1992-06-25

申请号：DE3871369

申请日：1988-03-08

Applicant: IBM

Inventor： BOTTAU FRANCOISE ,  GALAND CLAUDE ,  MENEZ JEAN ,  ROSSO MICHELE

IPC: G10L19/06 ,  G10L19/12 ,  H03M7/30 ,  G10L9/14

Abstract: The encoding process comprises the steps of filtering voice signal using a short-term predictive filter tuned by sets of partial correlation related coefficients derived from s(n) and deriving from them a short-term residual r(n). A long-term residual e(n) is derived by subtracting a weighted and delayed synthesis short-term residual from the r(n). E(n) is split into consecutive blocks. Each block of the long term residual e(n) is code excited encoded into one TABLE address reference k and one gain G.

公开(公告)号：DE3883519T2

公开(公告)日：1994-03-17

申请号：DE3883519

申请日：1988-03-08

Applicant: IBM

Inventor： BOTTAU FRANCOISE ,  GALAND CLAUDE ,  ROSSO MICHELE

IPC: G10L19/06 ,  G10L19/12 ,  G10L9/14

Abstract: The voice signal s(n) is filtered through a short-term predictive filter (13) tuned with PARCOR derived coefficients computed over a pre-emphasized s(n), said filter (13) providing a short-term residual r(n). Said r(n) signal is then processed through a first Code-Excited/Long-Term Predictive coder providing first couples of table address and gain data (k1, g1)'s. An error signal r min (n) is then derived by subtracting coded/decoded data from uncoded data. Then said error signal is processed through a second Code-Excited/ Long-Term Predictive coder providing second couples of data (k2, g2)'s. Full rate coding is achieved by multiplexing both couples (k1, g1)'s and (k2, g2)'s into a multi-rate frame; while switching to a lower rate is achieved through a mere delation of (g2, k2)'s from the full rate frame.