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ALC5611-GR Datasheet(PDF) 27 Page - Realtek Semiconductor Corp. |
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ALC5611-GR Datasheet(HTML) 27 Page - Realtek Semiconductor Corp. |
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27 / 73 page  ALC5611 Datasheet AC’97 Audio Codec + Touch Panel Controller 19 Track ID: JATR-1076-21 Rev. 1.1 7.8. Hardware Sound Effects 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.. 7.8.1. Equalizer Block The Equalizer block cascades 5 bands of equalizer to compensate for speaker response and to emulate environment sound. One high-pass filter cascaded in the front end is used to drop low frequency tone, which has a larger amplitude and may damage a mini speaker. The high-pass filter can also be used to adjust Treble strength with gain control. A low-pass filter with gain control can adjust the Bass strength. Three bands of bi-quad bandpass filters are used to emulate environment sounds. To avoid internal PCM data sample saturation, the digital volume control has up to 18dB of attenuation before the equalizer. A 0~+18dB digital gain after the equalizer is used to correct internal PCM data output to a suitable level. 7.8.2. 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. 7.9. Odd-Addressed Register Access The ALC5611 will return ‘0000h’ when odd-addressed and unimplemented registers are read. |
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