The main purpose with the frequency shifter is
to make frequency shift up and down for processed audio signal. Two signal
sources are needed; the carrier and the audio. Both carrier and audio signals
are splitted in two chains and are pre-processed to accomplish 90 degrees phase
shift between splitted signals.
The carrier generator has two
frequency ranges; LF (low frequency) and AUDIO and it's controlled by
knobs
COARSE, FINE and external CV signals (CARRIER CV). The carrier
generators outputs are pure sine waveforms with 90 degrees delay between them.
Outputs are patched to both ring modulators inputs. Two ring modulators (dual
balanced multipliers) receives 0 and 90 degrees shifted carrier and audio
signals . The outputs from the multipliers are combined in two ways; the
frequency shift UP and DOWN. The frequency shifted audio signal is a sum
(UP) or difference (DOWN) of the carrier generators frequency (a pure sine
waveform) and all audio signals frequencies (fundamentals and harmonics). The
FSH-1 works in two modes; as frequency shifter and as dual ring modulator.
A ring modulator is a classic audio effect
device and due to the non-harmonic character of the output signal. It's very
useful to create metallic timbres such as bells, sweeping whistles and
percussive sounds and tremolo effects. The obvious effect (particularly in LF
mode) is a stereo panning effect of audio signal.
