ALC5633 데이터 시트보기 (PDF) - Realtek Semiconductor

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ALC5633

I2C + I2S Stereo Audio Codec Mono Class-AB/D Amp

Realtek Semiconductor 

ALC5633Q

Datasheet

7.10. Hardware Sound Processing

The Sound Effect block is composed of Pseudo Stereo, Spatial 3D, and Equalizer blocks. The Pseudo

Stereo block is used to convert a MONO source into virtualized stereo output. The Spatial 3D block is a

surround sound generator with adjustable amplitude (Gain) and surround depth (Ratio). The Equalizer

block can be used to compensate for speaker response, or to make environment sound effects, e.g., ‘Pub’,

‘Live’, ‘Rock’,… etc..

7.10.1. Equalizer Block

The equalizer block cascades 7 bands of equalizer to compensate for speaker response and to emulate

environment sound. The 7 bands equalizer are include two high pass filter, four band pass filter and one

low pass filter. One high pass filter cascaded in the front end is used to drop low frequency tone, the tone

has a large amplitude and may damage a mini speaker.

The high pass filter can also be used to adjust Treble strength with gain control. One low pass filter with

gain control can adjust the Bass strength. Three bands of bi-quad band pass filters are used to emulate

environment sounds.

7.10.2. Pseudo Stereo and Spatial 3D Sound

There are two spatial effects in post-processing; the Pseudo-Stereo Effect + Spatial Effect, and the Stereo

Expansion Effect. The Pseudo-Stereo Effect + Spatial Effect converts a MONO signal to a stereo signal

by changing the phase and amplitude of the original signal followed by enhancing the spatial effect. The

Stereo Expansion Effect enhances the spatial effect when the input signal is Stereo.

7.10.3. Wind Noise Reduction Filter

The wind filter is implemented by a high pass filter equalizer. The wind filter is mainly for ADC

recording used. The bandwidth of wind filter is programmable and varies with sample rate. The filter is

used to remove DC offset at normal condition, and wind noise reduction at application mode.

Wind Filter fc decision by filter coefficient

The setting procedure of wind filter:

Step1: disable wind filter - REG-0x40[1:0]

Step2: fine tune wind filter coefficient - REG-0x40[7:2]

Step3: enable win filter - REG-0x40[1:0]

If want to change the coefficient, is also need to follow the procedure.

I2S Stereo Audio Codec + Mono Class-AB/D Amp

19

Rev. 0.1

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