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14 TASCAM TA-1VP
Shelving Filters
Shelving filters are used primarily as “tone controls,”
cutting or boosting whole regions of the spectrum. (You
can think of them as fancy versions of the traditional “Bass”
and “Treble” controls you’d find on home stereos or boom
boxes.) A high shelf filter, for instance, acts by raising
or lowering the part of the spectrum above the cut-off
frequency.
The graphs below show the response of the high shelf
and low shelf filters at +12 dB gain. Notice that the slope
of the roll-off is 6 dB per octave. The TA-1VP’s shelf filters
provide a slope control that let’s you vary the filter’s slope
between 2 dB and 12 dB per octave.
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-6
0
6
12
18
100 300 1000 3000 10000 22050
HS
HIGH SHELF FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: N/A
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-6
0
6
12
18
100 300 1000 3000 10000 22050
LS
LOW SHELF FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: N/A
Peaking Filter
The peaking filter is the traditional fully parametric EQ. It
can be used to subtly accentuate or attenuate a frequency
or for much more radical effects.
In the TA-1VP, the peaking filter works over a range of
20 Hz to 20 kHz and can boost or cut the signal at the
selected frequency by ± 18 dB. Additionally, you can vary
the bandwidth from 0.1 to 4.0 octaves.
The graphs below show the effect of changing the
bandwidth control of the peaking filter.
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-6
0
6
12
18
100 300 1000 3000 10000 22050
BP1
PEAKING FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: 1.0 octave
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-6
0
6
12
18
100 300 1000 3000 10000 22050
BP1
PEAKING FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: 0.1 octave
Band Pass and Notch Filters
Band pass and notch filters can be thought of as extreme
examples of the peaking filter.
The Band Pass filter sharply attenuates all frequencies
except for a band centered around the cutoff frequency.
The width of the pass band is set by the bandwidth or “Q”
control. The band pass filter is typically used to isolate a
particular frequency range in a track or mix.
The Notch Filter passes all frequencies except for a band
centered around the cutoff frequency, which is sharply
attenuated. The width of the notch is also set by the “Q”
control. The notch filter is used to eliminate unwanted
sounds appearing at a specific frequency in a track or mix.
2 – Introducing the TASCAM TA-1VP Vocal Producer