Operator’s Manual
DC1048 Integrated Audio Management
Page 53
All Pass Filter
The allpass filter has adjustable
frequency and ‘Q’ (or Bandwidth)
controls. These affect the
frequency at which the phase
effectively flips 180
°
, and the
‘speed’ at which this transition
occurs.
The graph shows an allpass filter
centred at 1kHz, with various ‘Q’
settings – the higher the ‘Q’ the
faster the transition.
Phase Filter
The phase filter has adjustable
frequency, and phase shift
controls. This introduces a phase
shift that gradually changes from
180
°
above the centre frequency
to the specificed value at the
centre frequency, and tending
towards 0
°
below the centre
frequency.
This graph shows the phase shift relative to the input (ignoring processing
delays), in 10
°
steps – the filter will actually provide higher resolution than this,
operating in 2
°
steps.The filter is centred at 1kHz in this example.
