TimeBandsConsumer

class spectacoular.consumer.TimeBandsConsumer

Bases: TimeConsumer

Provide frequency-band data to a Bokeh ColumnDataSource.

This TimeConsumer-derived class specializes in plots over frequency bands, such as octave spectra.

It works like TimeConsumer, but ignores down and rollover. Instead, only the first sample of each block is taken from the input. ds has a column for each input channel with one frequency-band value in each row. bands gives the bands, and lfunc can be used to convert them to human-readable label strings.

lfunc

Function to convert bands into list of labels

bands

List of labels for bands

numbands

Number of bands

update()

Update the data source from the GUI event loop.

ch_names()

Yield channel names for iterating over channels.

consume(doc)

Consume samples from the source in a non-GUI thread.

Parameters:

doc

Server document used to register callbacks.

init_ds()

Initialize the ColumnDataSource with channel columns.

result(num)

Yield the output block-wise.

This method does nothing in this class.

ds

Bokeh’s ColumnDataSource, updated from result loop

channels

channels to have in the output

num

input block size

down

downsampling factor for output

rollover

total length of columns in ds

thread

thread in which consume() runs

elapsed

elapsed time in data

updated

flag for update / consume

data

transport between consume / update

source

Data source; Generator or derived object.

sample_freq

Sampling frequency of output signal, as given by source.

num_channels

Number of channels in output, as given by source.

num_samples

Number of samples in output, as given by source.

digest

A unique identifier for the generator, based on its properties. (read-only)