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The 30 Band Graphic Equalizer
(Forensics Version Only)
30 Band Graphic IIR-Based EQ
The 30 Band 1/3rd Octave Graphic Equalizer is an IIR based extension of the 10 and 20 band Graphic Equalizers. It exhibits three times the selectivity compared to the 10-band equalizer, since each band is calibrated with 1/3rd of its bandwidth. This is very useful in Forensics applications wherein signals in a relative narrow portion of the audio spectrum need to be amplified or attenuated. Its amplification and attenuation range is +/- 12 dB as indicated by the numerical readouts located below each slider control. If this filter does not have sufficient selectivity for your application, then use the FFT based Spectral Filter, which has a choice of from 128 to as high as 32,000 bands. The 30 Band Graphic Equalizer has the following frequency band center frequency values:
25 Hz, 31 Hz, 40 Hz, 50 Hz, 62 Hz, 80 Hz, 100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 320 Hz, 400 Hz, 500 Hz, 640 Hz, 800 Hz,1 kHz,
1.3 kHz, 1.6 kHz, 2 kHz, 2.5 kHz, 3.1 kHz, 4 kHz, 5 kHz,
6.2 kHz, 8 kHz, 10 kHz, 13 kHz, 16 kHz, 20 kHz
Note:All bands above 45 % of the .wav files sampling frequency are disabled.
Figure 70 - The 30-Band Graphic EQ
(Forensics Version Only)
30 Band Graphic IIR-Based EQ
The 30 Band 1/3rd Octave Graphic Equalizer is an IIR based extension of the 10 and 20 band Graphic Equalizers. It exhibits three times the selectivity compared to the 10-band equalizer, since each band is calibrated with 1/3rd of its bandwidth. This is very useful in Forensics applications wherein signals in a relative narrow portion of the audio spectrum need to be amplified or attenuated. Its amplification and attenuation range is +/- 12 dB as indicated by the numerical readouts located below each slider control. If this filter does not have sufficient selectivity for your application, then use the FFT based Spectral Filter, which has a choice of from 128 to as high as 32,000 bands. The 30 Band Graphic Equalizer has the following frequency band center frequency values:
25 Hz, 31 Hz, 40 Hz, 50 Hz, 62 Hz, 80 Hz, 100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 320 Hz, 400 Hz, 500 Hz, 640 Hz, 800 Hz,1 kHz,
1.3 kHz, 1.6 kHz, 2 kHz, 2.5 kHz, 3.1 kHz, 4 kHz, 5 kHz,
6.2 kHz, 8 kHz, 10 kHz, 13 kHz, 16 kHz, 20 kHz
Note:All bands above 45 % of the .wav files sampling frequency are disabled.
Figure 70 - The 30-Band Graphic EQ