An implantable 
neural stimulation system, such as an auditory Fully Implantable 
System (FIS), includes: (1) an 
implanted device capable of providing desired tissue or 
nerve stimulation; and (2) a 
remote control unit that provides a mechanism for readily controlling the 
implant device, i.e., for selectively adjusting certain stimulation parameters associated with the tissue stimulation of the 
implanted device. The 
remote control unit uses a first 
signal path to send signals to the 
implant device, and a second 
signal path to receive signals from the 
implant device. The combination of these two 
signal paths provides a full-duplex channel between the 
remote control unit and the implant device through which air appropriate control and status signals may be sent and received. In one embodiment, the first signal path comprises an 
audio signal path through which audio control signals, e.g., a tone sequence or a 32-bit word FSK modulated between 300 and 1200 Hz, are sent; and the second signal path comprises a RF signal path through which a BPSK, QPSK or FM modulated RF signal is received. The full-duplex channel allows operation of the remote 
control unit, i.e., allows signals to be successfully sent to and received from the implant device, from as far away as 45-60 cm from the implant device.