In one embodiment, a satellite radio receiver is capable of simultaneously
processing (i) a first radio channel that is playing on a first speaker
and (ii) a second radio channel, different from the first radio channel,
that is not playing on the first speaker. The second radio channel can
simultaneously be playing on a second speaker, be recorded onto a
non-volatile memory, and/or have its processing modified. A user can
control the satellite radio receiver using vocal commands, while the
first channel is playing on the first speaker. The radio receiver has a
microphone connected to a voice-recognition command interpreter that
includes an interfering-sound canceller, which reduces sounds interfering
with the vocal commands, and a command-recognition module, which
recognizes vocal commands and provides a control signal to a
multi-channel control processor, which processes and controls the first
and second radio channels, received from corresponding decoders connected
to a satellite radio receiver antenna.