A communication device (105) includes a first communication block (205)
for operation within a first communication network (150); and a second
communication block (210) for operation within a second communication
network (160). The communication device (105) further includes an audio
control (245) for at least one microphone (250). The audio control (245)
is coupled to the first communication block (205) for receiving a first
audio input for operation of the first communication block (205) and is
coupled to the second communication block (210) for receiving a second
audio input for operation of the second communication block (210). A low
noise ground (315) is isolated from a common ground (320) of the
communication device (105) to facilitate the sharing of the at least one
microphone (250) between the two communication blocks.