McDSP Chrome Tone User Manual download pdf (Page 31)

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Page 27

McDSP NF575

Band Stop Filter

Band stop lters, or notch lters, are designed to

remove a specied amount of signal at exactly the

selected frequency. Band stop (notch) lters have a

slope, or Q control, that determines the width of the

actual notch shape. A Q of 1.0 is about one frequency

octave. A Q of 12.0 is about 1/12 a frequency octave, or

one semi-tone. At the exact selected frequency of the

band stop (notch) lter the signal reduction is maximum.

Some band stop (notch) lters, like those found on the

NF575, allow user adjustment of the amount of signal

reduction.

A band stop (notch) is useful for removing cyclical noise

like 60 Hz hum and camera shutter noise.

Band Pass Filter

Band pass lters only pass signal at the exact selected

frequency. Signal levels are reduced for frequencies

above and below the selected frequency. Band pass

lters have a slope, or Q control, that determines the

width of the actual band pass shape. A Q of 1.0 is

about one frequency octave. A Q of 12.0 is about 1/12

a frequency octave, or one semi-tone.

A band pass lter is useful for auditioning narrow

segments of the audio spectrum to monitor cyclical

noise and other audio signal problems.

FREQUENCY

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McDSP Chrome Tone User Manual Page 31