Kling-freitag K&F CD 44 Digital System controller User Manual download pdf (Page 16)

User's manual K&F CD 44 Digital System Controller

50 100 500

1000

5000

10000

20000

Frequency in [Hz]

Power in [dB]

FilterType = 'Bell' (Bell Passband) Gain = +6dB Freq = 1000Hz

Q = 0.2

Q = 0.707

Q = 1.414

Q = 5

The gain determines the maximum or minimum level increase or attenuation of the filter

(in the graph: increase of +6dB.

This 'bell' is logarithmically symmetrical relative to the selected frequency (in the

example: 1000 Hz).

The Q-factor defines the quality of the filter. In doing so, it determines the width of the

frequency range which is to be increased or attenuated. The higher the Q-factor, the

narrower the frequency range. A lower Q-factor thus has a wider range.

"Q" is adjustable in steps of 0.001 from 0.2 to 20.

Typical Q-values and their bandwidth equivalent:

Bandwidth Q factor

1/3 Oktave (third) 4.318

2/3 Oktave (two thirds) 2.145

1 octave 1.414

1 1/3 1.044

1 2/3 0.819

2 0.666

1/6 octave (whole step) 8.651

2. HShelv (high shelving filter)

3. LShelv = Low Shelving Filter

These filters increase (positive gain) or attenuate (negative gain) the frequencies below

or above the selected frequency.

Below = LShelv

Above = HShelv

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 76 77

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Kling-freitag K&F CD 44 Digital System controller User Manual Page 16