Audio processor with a steered audio bandwidth extension

An audio coder for coding an audio signal, the coder comprising:

• a band-limited entity configured to code the signal to acquire a band-limited signal;
• and
• a bandwidth extension entity configured to code an extended-band signal, and comprising a mixture of a first extended-band excitation and a second extended-band excitation;
• wherein the bandwidth extension entity is configured to generate the first extended-band excitation and a noise generator configured to generate random noise as the second extended-band excitation;
• wherein the mixture is controlled via a steering factor derived from a characteristic output or parameter of the band-limited entity;
• wherein the bandwidth extension entity is configured to generate the first extended-band excitation from a temporal envelope derived from the band-limited signal, especially a linear prediction residual of the band-limited signal or of an excitation modelling the linear prediction residual of the band-limited signal, by use of an envelope determiner;
• wherein the bandwidth extension entity is configured to generate the first extended-band excitation by placing pulses in relation to values, wherein the values are determined by an analyzer analyzing the temporal envelope, the pulses being weighted using weights derived from the temporal envelope.

Method for processing a signal, the method comprising:

• providing a band-limited signal;
• and
• providing an extended-band signal, the extended-band signal comprising a mixture of a first extended-band excitation and a second extended-band excitation;
• generating the first extended-band excitation from a temporal envelope derived from the band-limited signal, especially a linear prediction residual of the band-limited signal or of an excitation modelling the linear prediction residual of the band-limited signal;
• and generating random noise as the second extended-band excitation;
• wherein the mixture is controlled via a steering factor derived from a characteristic output or parameter of the band-limited entity;
• wherein the generating the first extended-band excitation comprises placing pulses in relation to values, wherein the values are determined by analyzing the temporal envelope, the pulses being weighted using weights derived from the temporal envelope.

A non-transitory digital storage medium having a computer program stored thereon to perform the method for processing a signal, the method comprising:

• providing a band-limited signal;
• and
• providing an extended-band signal, the extended-band signal comprising a mixture of a first extended-band excitation and a second extended-band excitation;
• generating the first extended-band excitation from a temporal envelope derived from the band-limited signal, especially a linear prediction residual of the band-limited signal or of an excitation modelling the linear prediction residual of the band-limited signal;
• and generating random noise as the second extended-band excitation;
• wherein the mixture is controlled via a steering factor derived from a characteristic output or parameter of the band-limited entity;
• wherein the generating the first extended-band excitation comprises placing pulses in relation to values, wherein the values are determined by analyzing the temporal envelope, the pulses being weighted using weights derived from the temporal envelope,
• when said computer program is run by a computer.