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CS4237B Datasheet(PDF) 68 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 68 Page - Cirrus Logic |
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68 / 114 page  CS9236 Wavetable Control (C8) Default = xxxx0000 D7 D6 D5 D4 D3 D2 D1 D0 res res res res WTEN SPS DMCLK BRES BRES Force BRESET low. When set, the BRESET pin is forced low. Typically used for power management of pe- ripheral devices. DMCLK Disable MCLK. When set, the MCLK pin of the CS9236 Wavetable Syn- thesizer serial interface is forced low providing a power savings mode. SPS DSP Serial Port Switch. When set, switches the DSP serial port pins from the 2nd joystick to the XD4- XD1 pins. When SPE in I16 is set, XD4-XD1 convert to the DSP serial port pins. Once SPS is enabled, the SD<7:0> bus will not be driven when accesses occur to peripheral port de- vices. SPS can also be set in the E 2PROM Hardware Configuration data, Global Configuration byte. WTEN Wavetable Serial Port Enable. When, set, forces XD7-XD5 pins to convert to the CS9236 Single-Chip Wave- table Music Synthesizer serial port pins. Once WTEN is enabled, the SD<7:0> bus will not be driven when accesses occur to peripheral port de- vices. WTEN can also be set in the E 2PROM Hardware Configuration data, Global Configuration byte. Setting this bit also changes I6/I7 from the master digital audio volume to the ISA bus wave volume control. X14/15 becomes the master digital audio volume. res Reserved. Must write 0. Could read as 0 or 1. SRS 3D Sound Overview The SRS 3D Stereo DSP engine is designed to retrieve and restore spacial information, direc- tional cues, and other sonic nuances which are either missing or altered by the electronic repro- duction of stereo and/or the microphone mixing process. SRS 3D Mono processing, when used in conjunction with the SRS 3D Stereo system, synthesizes a 3D stereo signal from a monaural source. SRS stands for Sound Retrieval System. It dif- fers from stereo and other sound expansion techniques because it is based on the human hearing system. The ears are complex instru- ments that allow us to hear in three dimensions. Microphones and traditional stereo playback sys- tems only produce flat, two dimensional sound images which are somewhat limited compared to "real live sound". SRS compensates for these limitations by re-establishing the necessary infor- ma tion that allows us to hear in th ree dimensions. The results are surprisingly close to real live sound. SRS is unique because it does not rely on special recording techniques. It works with any audio signal whether it is mono, stereo, surround sound, or even signals encoded with a sound-en- hancement process. Most importantly, SRS does not alter the original program material by adding any form of time delay, phase shift, or harmonic distortion. With SRS 3D sound there is no critical listening position or sweet spot. The listener can move around the room and continue to be immersed in full three-dimensional sound. Speakers are no longer the discernible point source of sound. SRS is a patented process that differs from ste- reo and surround sound in that it works with any existing recorded material: mono, stereo, sur- round-encoded, or other encoding technologies. SRS is not required in the recording process. This means a listener’s entire audio library can be enhanced by SRS by simply playing it through the CS4237B Crystal chip. Like stereo, any two-speaker stereo system is adequate. DS213PP4 CS4237B 68 |
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