Echo Cancellation For A Packet Voice System

One or more circuits for a communication system, the method comprising:

• at least one processor operable to, at least:
• receive a first signal having spectral components within a first frequency band;
• accept a second signal having spectral components in a second frequency band extending beyond the first frequency band;
• remove a modified version of the first signal from the second signal to produce a third signal;
• and
• process the third signal based upon a level of spectral components of the second signal extending beyond the first frequency band.

One or more circuits for use in a communication system comprising a plurality of communication terminals operating in one of a narrowband mode and a wideband mode, the wideband mode supporting wideband signals with spectral components comprising and extending beyond the spectral components of narrowband signals supported by communication terminals operating in the narrowband mode, the one or more circuits comprising:

• at least one processor comprising at least one interface for operably coupling to a first communication terminal operating in narrowband mode and a second communication terminal operating in wideband mode, the at least one processor operable to, at least:
• receive a narrowband first signal from the first communication terminal;
• receive a wideband second signal from the second communication terminal;
• detect voice activity in the second signal using a level of energy of spectral components of the second signal outside of the spectral components of the first signal;
• process the second signal to produce a narrowband transmit signal;
• and
• transmit the processed transmit signal to the first communication terminal.

One or more circuits for use in a communication terminal, the one or more circuits supporting voice communication with communication terminals using wideband signals and narrowband signals, the wideband signals having spectral components comprising and extending beyond the spectral components of the narrowband signals, the one or more circuits comprising:

• at least one processor comprising at least one interface for operably coupling to a first communication terminal operating in narrowband mode, the at least one processor operable to, at least:
• receive, via a communication network, a narrowband first signal from the first communication terminal;
• receive a wideband second signal from a microphone at a second communication terminal;
• detect voice activity in the second signal using a level of energy of spectral components of the second signal outside of the spectral components of the first signal;
• process the second signal to produce a narrowband transmit signal;
• and
• transmit the processed transmit signal to the first communication terminal.