TEAC TA-1VP TA-1VP owners manual - Page 14

2 - Introducing the TASCAM TA-1VP Vocal Producer 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. 18 HS LOG MAGNITUDE (dB)12 6 HIGH SHELF FILTER Frequency: 1,000 Hz Gain: +12 dB 0 Bandwidth: N/A -6 50 100 300 1000 3000 FREQUENCY 10000 22050 18 LS LOG MAGNITUDE (dB)12 6 LOW SHELF FILTER Frequency: 1,000 Hz Gain: +12 dB 0 Bandwidth: N/A -6 50 100 300 1000 3000 FREQUENCY 10000 22050 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. 18 BP1 12 6 LOG MAGNITUDE (dB) 0 PEAKING FILTER Frequency: 1,000 Hz Gain: +12 dB Bandwidth: 1.0 octave -6 50 100 300 1000 3000 FREQUENCY 10000 22050 18 BP1 12 6 LOG MAGNITUDE (dB) 0 PEAKING FILTER Frequency: 1,000 Hz Gain: +12 dB Bandwidth: 0.1 octave -6 50 100 300 1000 3000 FREQUENCY 10000 22050 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. 14 TASCAM TA-1VP