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This version (18 May 2021 08:41) was approved by John Joseph.The Previously approved version (18 Mar 2021 02:21) is available.Diff

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Pitch Transposer


Description

Pitch Transposer algorithm shifts the frequency of an incoming signal. There are two versions of the algorithm. The first version allows the user to manually set the pitch shift amount by entering it in the GUI (or writing a value directly to RAM). In the data controlled variant, the frequency shift is “voltage-controlled”, meaning that there is an input pin that controls the pitch shift amount based on its value.

Variants

  1. Pitch Transposer
  2. Pitch Transposer Data Controlled


Targets Supported

Name ADSP-214xx ADSP-215xx/SC5xx ADAU145x/146x
—————————————————- ——————-- ——————————-- —————————-
Pitch Transposer NA NA S
Pitch Transposer Data Controlled NA NA S


Pins

Input

Name Type Description
—————————— ————-- ———————-
Input0/InputSignal Audio Input signal that will have its frequency shifted
Frequency Control Frequency shift amount (percentage/sampling-rate). Available only in Data Controlled variant

Output

Name Type Description
———————————— ————-- ———————-
Output0 Audio Outputs the processed signal


Configurable Parameters

GUI Parameter Default Value Range Function Description
—————————————- ———————- —————— —————————————-
Frequency 100 0 - 4000 Maximum Percentage (%) change of input frequency, controlled by the Frequency shift slider. The actual percentage of frequency shift is dependent on the “Delay Reserved” amount
Delay 300 0 - 4000 This control sets the number of samples of audio delay that are reserved in memory as a buffer used for the pitch shifting algorithm. Smaller delay buffers result in more discontinuities in the pitch shifted output signal, which causes some harmonic distortion. Setting this delay buffer to a very large size will result in less distortion, but at the cost of increased delay memory usage
Multiplier 1 The slider in the middle of the cell sets the amount of pitch shift. When the slider is exactly in the middle, there will be no pitch shift. When the slider is to the right of the center, the pitch of the input signal will be shifted up in frequency. When the slider is to the left of the center, the pitch of the input signal will be shifted down in frequency. When the slider is all the way to the left or right, the pitch will be shifted by the maximum amount (down or up), as determined by the setting of the Max Shift control.


DSP Parameters

Parameter Name Description ADAU145x/146x
—————————————- —————————————————————- —————————————-
freq Change in frequency 8.24 Format
scalingfactor pitch change factor Integer


resources/tools-software/sigmastudiov2/modules/adialgorithms/pitchtransposer.txt · Last modified: 13 May 2021 06:23 by John Joseph