Standard sampling frequency converter chips continuously measure the input
frequency and then generate the output frequency and the filter specifications
accordingly. This results in coefficient "jitter" because the input signal
sampling frequency jitter modulates the cutoff frequency of the digital filter.
The SFC2 uses a fixed-ratio scheme where the output is directly derived from the
input sampling frequency - therefore no coefficient "jitter", no filter
modulation, more transparency.
The SFC2 won the Studio Sound magazine SSAIRA award for the year 2000 in the
The main application of the SFC2 is integrating playback or outboard
equipment into an environment that either runs at double- or standard-sampling
frequency. To allow this equipment to be positioned anywhere in the processing
chain, the SFC2 features two completely independent two-channel sampling
frequency converters to simultaneously down- and up-sample a signal.
Alternatively, it can also be used to convert the sampling frequency and reduce
the wordlength of any two arbitrary audio signals at the same time.
24bit single wire high-speed AES/EBU interfaces
20 / 16bit wordlength reduction
auto-blacking for dither noise
40bit floating point / 32bit fixed point processing