(8.D.1.2) OneShotPlayerFract32
- Catherine Spain
Overview
One shot player with trigger pin
Discussion
WAV file player in which playback is triggered via an input pin. The input .trigger is a Boolean value which, if set, starts playback. The trigger must be an impulse of length 1 frame, or the initial frame of the WAV will be repeated while .trigger remains set. When .trigger is reset to 0, playback continues from the second frame until it stops at end of the file. If .trigger is set again while in the middle of playback then playback will restart.
The second input pin fRatio determines the playback speed. If fRatio = 1.0 then playback is at the expected rate. fRatio > 1.0 causes the pitch to increase and fRatio < 1.0 causes the pitch to decrease.
The module supports only mono playback and first channel of the input wave file is used if it is a multi-channel wave file.
Type Definition
-Not Shown-
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
wavLength | int | const | 0 | 100400 | Unrestricted | Â |
wavSR | int | const | 0 | 48000 | Unrestricted | Â |
nRate | float | const | 0 | 1 | Unrestricted | Â |
mRate | float | const | 0 | 1 | Unrestricted | Â |
Pins
Input Pins
Name: trigger
Description: Boolean trigger signal
Data type: int
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
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Name: fRatio
Description: Specifies the playback speed
Data type: float
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: Output audio
Data type: fract32
Scratch Pins
Channel count: 1
Block size: 1
Sample rate: 48000
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Channel count: 1
Block size: 1
Sample rate: 48000
MATLAB Usage
File Name: one_shot_player_fract32_module.m
SYS = one_shot_player_fract32_module(NAME, BLOCKSIZE, SAMPLERATE, WAVFILE, NRATE, MRATE, FPIN)
Creates a one shot player module which plays back a WAV file when triggered. Arguments:
NAME - name of the module.
BLOCKSIZE - block size of the module output. By default,
BLOCKSIZE = 256.
SAMPLERATE - sample rate of the output signal, in Hz. By default,
SAMPLERATE = 48000. This does not have to match the sample rate of
the WAVFILE.
WAVFILE - WAV file containing the samples to playback.
NRATE - normalized playback rate. This helps to scale the playback audio
rate. For example, if the WAVFILE corresponds to 1500 RPM, then set
NORMALIZEDRATE = 1500 and when the signal on the .fRate input pin
equals 1500 then the WAVFILE will be played back at the original
rate.
MRATE - Maximum playback rate (relative to NRATE).Â