Hold

class gpype.backend.timing.hold.Hold

Bases: IONode

Classical sample-and-hold node for arbitrary resampling.

Implements sample-and-hold behavior where input is forwarded to output and remains asynchronously available for retrieval at any rate.

__init__(**kwargs)

Initialize sample-and-hold node with asynchronous output.

Parameters:

**kwargs – Additional arguments for parent IONode.

setup(data, port_context_in)

Setup asynchronous output context for sample-and-hold operation.

Removes sampling rate constraints from output context, enabling downstream nodes to access held values at any desired rate.

Parameters:

• data (dict[str, ndarray]) – Input data arrays.

• port_context_in (dict[str, dict]) – Input port contexts containing channel count and frame size.

Return type:

dict[str, dict]

Returns:

Output port contexts with asynchronous timing and no sampling rate.

Raises:

ValueError – If channel count or frame size not provided, or if frame size is not 1.

step(data)

Forward input sample and hold for asynchronous retrieval.

Implements the hold operation by making input data available on output where it remains accessible until the next update.

Parameters:

data (dict[str, ndarray]) – Input data dictionary containing sample to hold.

Return type:

dict[str, ndarray]

Returns:

Dictionary with held sample on output port.