Generating LSF vectors

Mobile station for a communication system comprising processing means for:

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which formed LSF tracks represent values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Encoder comprising processing means for:

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent the values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Chip, comprising means for:

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Communication network comprising an encoder with processing means for:

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent values of a respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Communication system comprising a communication network and at least one mobile station, wherein at least one of said communication network and said at least one mobile station comprises processing means for

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Computer program with a program code for storage on a computer-readable medium for

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate;
• wherein said computer program is for execution by signal processing means.

Computer program product with a program code, which program code is stored on a machine readable carrier, for

• calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• forming LSF tracks for said LSF parameters, which LSF tracks represent values of respective LSF parameters over time;
• low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said desired vector output rate;
• wherein said computer program is for execution by signal processing means.

Mobile station for a communication system comprising

• a calculation component for calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• a vector extraction component for extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• a track forming component for forming LSF tracks for said LSF parameters over time;
• a filter component for low pass filtering formed LSF tracks with a predetermined cut-off frequency;
• and
• a reconstruction component for reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Encoder comprising

• a calculation component for calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• a vector extraction component for extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• a track forming component for forming LSF tracks for at least one of said LSF parameters, which LSF tracks represent the value of respective LSF parameters over time;
• a filter component for low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• a reconstruction component for reconstructing a decimated number of LSF vectors from sad low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Chip comprising

• a calculation component for calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• a vector extraction component for extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• a track forming component for forming LSF tracks for said LSF parameters, which LSF tracks represent the value of respective LSF parameters over time;
• a filter component for low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• a reconstruction component for reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Communication network comprising an encoder with

• a calculation component for calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• a vector extraction for extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• a track forming component for forming LSF tracks for said LSF parameters, which LSF tracks represent the values of respective LSF parameters over time;
• a filter component for low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• a reconstruction component for reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.

Communication system comprising a communication network and at least one mobile station, wherein at least one of said communication network and said at least one mobile station comprises

• a calculation component for calculating Linear Predictive Coefficients (LPCs) from samples of audio signals;
• a vector extraction component for extracting LSF vectors from said LPCs with an extraction rate higher than a selected vector output rate, said LSF vectors comprising values of different LSF parameters;
• a track forming component for forming LSF tracks for said LSF parameters, which LSF tracks represent the values of respective LSF parameters over time;
• a filter component for low pass filtering said formed LSF tracks with a predetermined cut-off frequency;
• and
• a reconstruction component for reconstructing a decimated number of LSF vectors from said low pass filtered LSF tracks, said decimated number corresponding to said selected vector output rate.