CM6533-N Datasheet, PDF (20/60 Pages) C-Media Electronics – USB 2.0 Full-Speed compliant

CM6533,CM6533N,CM6533X1,CM6533DH
USB Audio Chip
6 Function Description
6.1 Playback Equalizer
6.1.1 5-band equalizer
CM6533/CM6533N/CM6533X1/CM6533DH has integrated five (5)-band hardware digital equalizer (EQ) engine inside
the chips to fulfill various application usages. It provides up to four (4)-preset modes on client’s product design for
different user scenarios including default/music, movies, gaming and communication modes. Clients could also
change the gain parameters for each of the preset application EQ mode via embedded FLASH coding. Also, the EQ
engine could also be utilized for compensating and fine-tuning the headphone driver for Sound Pressure Level (SPL)
performance to a specific preference. In this case, clients could fully customize all EQ coefficients such as center
frequency, gain values, and bandwidth to one optimized frequency response curve and setting in terms of the
headphone driver and housing’s acoustics characteristics, also via embedded FLASH programming.
PCM
Digital
Attenuation
PCM
Digital Equalizer
(5-Band Fc, Gain,
Bandwidth, OPA Gain)
PCM
Digital-Analog
-Converter
Analog
Analog
A_Gn_aa_il_nog
Gain
The EQ engine contains five (5) frequency bands (Fc) of digital filters to conduct transfer functions of the frequency
response over the audio band. It allows maximum +-12dB digital gain (Gain) for each band with 0.5dB adjustment per
step. Each filter will have its bandwidth (BW) factor between 0 and 1.0.
Fc: Center Frequency, F1~F5, 20<Fc<20K (Hz)
Gain: Digital Frequency Gain, -12dB <= Gain <=+12dB, 0.5dB/step
BW: Filter Bandwidth Factor, 0<BW<1
OPA Gain: Analog Gain Compensation setting for each equalizer mode
The EQ engine already provides four (4)-preset modes/settings based on the same preset F1~F5 center frequencies
and OPA gain:
F1 (Bass)= 100Hz
F2 = 350Hz
F3 = 1KHz
F4 = 3.5KHz
F5 (Treble) = 13KHz
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Rev.1.6
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