Temporal Quantization

A basic example of temporal quantization, where transient-based segments are temporally shifted to align with a rhythmic grid.

temporal_quantization.bell

## Import an audio buffer from the file 'drums.wav'
$b = importaudio('drums.wav');
## Perform onset detection analysis on the buffer
$analysis = onsets();
## Apply the analysis to the buffer to extract onset markers
$b = analyze($b, $analysis);
## Retrieve the onset positions detected in the buffer
$markers = $b.getkey('onsets');
## Compute segment durations by converting onset times into durations
$markerdurs = x2dx($markers $b.getkey('duration'));
## Define the time unit for placing segments in the transcription
$timeunit = 150;
## Initialize the onset time for the transcription
$onset = 0;
## Loop through each detected onset marker and its corresponding duration
for $marker in $markers, $dur in $markerdurs do (
    ## Define a segment using the detected duration and offset
    $seg = $b.setkey('duration', $dur).setkey('offset', $marker);
    ## Transcribe the segment with a gain envelope
    $seg.transcribe(
        ## Set the transcription onset time
        @onset $onset
        ## Apply an amplitude envelope
        @gain [0 1 0] [1 0 -0.5] 
    );
    ## Increment the onset time for the next segment
    $onset += $timeunit
);
## Render the audio output and play the result
render(@play 1)