公开(公告)号：JP2001034300A

公开(公告)日：2001-02-09

申请号：JP2000123010

申请日：2000-04-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHOINE MICHAEL C

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04

Abstract: PROBLEM TO BE SOLVED: To realize a vocoder and a method of operating such the vocoder, capable of more accurately expressing a fixed code book response of a signal frame (or sub-frame) in the state in which the number of bit positions is limited in a bit frame. SOLUTION: A vocoder 50 has a fixed code book 52 having plural entries of a pulse train to compare a residual signal of a signal frame. The entry of the fixed code book 52 is set according to the signal frame to be encoded. A noise signal is stored in the transmission vocoder 50. During encoding, the noise signal is reshaped by filtering dependent on a decided parameter characterizing the signal frame or the sub-frame. The reshaped noise signal is passed through a threshold filter to obtain the pulse train. A fixed code book response is selected as a part (entry) which is matched best with the residual signal of the signal frame or the sub-frame among the pulse trains.

公开(公告)号：DE60016305D1

公开(公告)日：2005-01-05

申请号：DE60016305

申请日：2000-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHOINE MICHAEL C

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04 ,  G10L19/10

Abstract: A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.

公开(公告)号：DE60016305T2

公开(公告)日：2005-11-24

申请号：DE60016305

申请日：2000-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHOINE MICHAEL C

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04 ,  G10L19/10

Abstract: A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.

公开(公告)号：BR0009621A

公开(公告)日：2002-04-23

申请号：BR0009621

申请日：2000-04-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHIONE MICHAEL CHARLES

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04

Abstract: A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.

公开(公告)号：AU2893900A

公开(公告)日：2000-11-02

申请号：AU2893900

申请日：2000-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHIONE MICHAEL CHARLES

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04 ,  G10L19/02 ,  H03M7/42

Abstract: A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.

公开(公告)号：CA2305972A1

公开(公告)日：2000-10-28

申请号：CA2305972

申请日：2000-04-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERZIN ENGIN ,  RECCHIONE MICHAEL CHARLES

IPC: G10L19/00 ,  G10L19/12 ,  H04B14/04

Abstract: A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.