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[[resources/tools-software/sigmastudiov2/modules/adialgorithms|Click here to return to the ADI Algorithms page]]
====== Phat-Stereo ======
{{:resources:tools-software:sigmastudiov2:modules:adialgorithms:phatstereo.png?nolink}}
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===== Description =====
Phat-Stereo is a spreading algorithm that uses stereo cross-coupling to simulate surround sound in stereo speakers and other 2-channel situations. The ear is most responsive to interaural phase shifts below 2 kHz, so this increase in phase shift results in a widening of the stereo image. 
A 3D enhancement, it yields an enriched surround field both for headphones and for stereo speakers. 
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===== Targets Supported =====
^ Name            ^ ADSP-214xx ^ ADSP-215xx/SC5xx ^ ADAU145x/146x ^
| ------------------------------ | -------------------- | -------------------------------- | ---------------------------- |
| Phat-Stereo | S          | S                | S              |
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===== Pins =====
==== Input ====
^Name^Type^Description^
| ---------------------- | -------------- | ---------------------- |
|Input0|Audio|Input Channel0||
|Input1|Audio|Input Channel1|
==== Output ====
^Name^Type^Description^
| ---------------------- | -------------- | ---------------------- |
|Output0|Audio|Output channel0|
|Output1|Audio|Output channel1|
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===== Configurable Parameters =====
^GUI Parameter Name^Default Value^Range^Function Description^
| ---------------------------------------- | ---------------------- | ------------------------ | ---------------------------------------- |
|Cut Freq (Hz)|150|20 to 20000 Hz |Controls the cutoff frequency of the first-order low-pass filter. Determines the frequency range of the added out-of-phase signals.|
|Level |-70| -96 to 6.0 dB|Controls the output level of the filter|
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===== DSP Parameters =====
^ Parameter Name       ^ Description ^ ADSP-214xx/SC5xx/215xx ^ ADAU145x/146x ^
| ---------------------------------------- | -------------------------------------------------------------------------------- | ---------------------------------------- | ---------------------------- |
|AlphaSpread|Scales the spreading value|Float|8.24 Format|
|SpreadLevel|Scales the gain of spreading signal|Float|8.24 Format|
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===== DSP Parameter Computation =====
AlphaSpread    =  1.0 - 2.7^(-6.28 * CutFreq/ fs)\\
SpreadLevel  =  10^(Level/ 20.0)
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