CM6533DH datasheet(20/60 Pages) CMEDIA

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CM6533,CM6533N,CM6533X1,CM6533DH

USB Audio Chip

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www.cmedia.com.tw

Rev.1.6

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.

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

Analog

Gain

Digital

Attenuation

Digital Equalizer

(5-Band Fc, Gain,

Bandwidth, OPA Gain)

Digital-Analog

-Converter

Analog

Gain

PCM

Analog

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