Methods for generating comfort noise during discontinuous transmission

Apparatus for generating comfort noise (CN) in a system that uses a discontinuous transmission to a network, comprising:

• means in said digital mobile terminal that is responsive to a speech pause for calculating random excitation spectral control (RESC) parameters and for transmitting the RESC parameters together with predetermined ones of CN parameters to a receiver in said network.

A method for producing comfort noise (CN) in a digital mobile terminal receiver that uses a discontinuous transmission, comprising the steps of:

• receiving random excitation spectral (RESC) parameters;
• and
• shaping the spectral content of an excitation using the received RESC parameters prior to applying the excitation to a synthesis filter.

Mobile terminal apparatus for generating comfort noise (CN) in a system that uses a discontinuous transmission to a network, comprising:

• means in said mobile terminal for shaping the spectral content of an excitation using received excitation spectral control (RESC) parameters prior to applying the excitation to a synthesis filter.

A method for producing comfort noise (CN) in a network element that uses a discontinuous transmission, comprising the steps of:

• receiving excitation spectral control (RESC) parameters;
• and
• shaping the spectral content of an excitation using the received RESC parameters prior to applying the excitation to a synthesis filter.

Apparatus for generating comfort noise (CN) in a system having a digital mobile terminal that uses a discontinuous transmission to a network, comprising:

• means in said network for shaping the spectral content of an excitation using received excitation spectral control (RESC) parameters prior to applying the excitation to a synthesis filter.

Apparatus as in claim 63, wherein the speech coder implements a LPC analysis technique, and wherein the analysis is of lower degree than the LPC analysis technique.

A method for producing comfort noise (CN) in a digital network element that uses a discontinuous transmission, comprising the steps of:

• in response to a speech pause, calculating random excitation spectral control (RESC) parameters;
• and
• transmitting the RESC parameters to a receiver together with predetermined ones of CN parameters.

Apparatus for generating comfort noise (CN) in a system having a network element that uses a discontinuous transmission, comprising:

• means in said network element that is responsive to a speech pause for calculating random excitation spectral control (RESC) parameters and for transmitting the RESC parameters together with predetermined ones of CN parameters to a receiver in said network.

Apparatus for generating comfort noise (CN) in an element of a mobile communication network that uses a discontinuous transmission to a network, comprising:

• data processing means in network element that is responsive to a speech pause for buffering a set of speech coding parameters and, within an averaging period, for replacing speech coding parameters of the set that are not representative of background noise with speech coding parameters that are representative of the background noise, said data processing means averaging the set of speech coding parameters and transmitting the averaged set of speech coding parameters to the mobile terminal.