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Page 4 of 10 TN-1114-AN

4 Functional Description

Exciter Bypass The bypass path connects the audio sampled at 25kHz from the analogue

unbalanced line input directly into the frequency control loop (FCL), which

then modulates the RF hardware. The only digital filtering in the bypass

path is an optional AC filter, which has a cut-off frequency of 0.8Hz. Note

that there is no limiter present in this path.

Receiver Bypass On the receive audio bypass path, received audio from the FM demodulator

is decimated from 50kHz to 25kHz. It is then directly converted to the

analogue unbalanced line output with no further filtering.

Extended Bypass There is anti-alias analogue filtering performed on the unbalanced lines, and

also on the FCL outputs. This filtering on the bypass path causes a roll-off

in amplitude as the audio frequency is increased. When extended bypass is

enabled, the analogue filtering on the unbalanced lines is disabled by

hardware, and a digital finite impulse response filter with a constant group

delay is used in both the transmit and receive bypass paths to extend the

frequency response.

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