katgpucbf.fgpu.output module

Data structures capturing static configuration of a single output stream.

class katgpucbf.fgpu.output.NarrowbandOutput(name: str, channels: int, jones_per_batch: int, taps: int, w_cutoff: float, window_function: WindowFunction, dst: list[Endpoint], dither: DitherType, centre_frequency: float, decimation: int, ddc_taps: int, weight_pass: float)[source]

Bases: Output

Static configuration for a narrowband stream.

centre_frequency: float

ddc_taps: int

decimation: int

property spectra_samples: int

Number of incoming digitiser samples needed per spectrum.

Note that this is the spacing between spectra. Each spectrum uses an overlapping window with more samples than this.

weight_pass: float

property window: int: Number of digitiser samples that contribute to each output spectrum.

class katgpucbf.fgpu.output.NarrowbandOutputDiscard(name: str, channels: int, jones_per_batch: int, taps: int, w_cutoff: float, window_function: WindowFunction, dst: list[Endpoint], dither: DitherType, centre_frequency: float, decimation: int, ddc_taps: int, weight_pass: float)[source]

Bases: NarrowbandOutput

Static configuration for a narrowband stream that discards channels.

property internal_channels: int: Number of channels in the PFB.

property internal_decimation: int: Factor by which bandwidth is reduced by the DDC kernel.

property subsampling: int: Number of digitiser samples between PFB input samples.

class katgpucbf.fgpu.output.NarrowbandOutputNoDiscard(name: str, channels: int, jones_per_batch: int, taps: int, w_cutoff: float, window_function: WindowFunction, dst: list[Endpoint], dither: DitherType, centre_frequency: float, decimation: int, ddc_taps: int, weight_pass: float, pass_bandwidth: float)[source]

Bases: NarrowbandOutput

Static configuration for a narrowband stream that does not discard channels.

property internal_channels: int: Number of channels in the PFB.

property internal_decimation: int: Factor by which bandwidth is reduced by the DDC kernel.

pass_bandwidth: float

property subsampling: int: Number of digitiser samples between PFB input samples.

class katgpucbf.fgpu.output.Output(name: str, channels: int, jones_per_batch: int, taps: int, w_cutoff: float, window_function: WindowFunction, dst: list[Endpoint], dither: DitherType)[source]

Bases: ABC

Static configuration for an output stream.

channels: int

dither: DitherType

dst: list[Endpoint]

abstract property internal_channels: int: Number of channels in the PFB.

abstract property internal_decimation: int: Factor by which bandwidth is reduced by the DDC kernel.

jones_per_batch: int

name: str

property spectra_per_heap: int: Number of spectra in each output heap.

abstract property spectra_samples: int

Number of incoming digitiser samples needed per spectrum.

Note that this is the spacing between spectra. Each spectrum uses an overlapping window with more samples than this.

abstract property subsampling: int: Number of digitiser samples between PFB input samples.

taps: int

w_cutoff: float

abstract property window: int: Number of digitiser samples that contribute to each output spectrum.

window_function: WindowFunction

class katgpucbf.fgpu.output.WidebandOutput(name: str, channels: int, jones_per_batch: int, taps: int, w_cutoff: float, window_function: WindowFunction, dst: list[Endpoint], dither: DitherType)[source]

Bases: Output

Static configuration for a wideband output stream.

property decimation: int

property internal_channels: int: Number of channels in the PFB.

property internal_decimation: int: Factor by which bandwidth is reduced by the DDC kernel.

property spectra_samples: int

Number of incoming digitiser samples needed per spectrum.

Note that this is the spacing between spectra. Each spectrum uses an overlapping window with more samples than this.

property subsampling: int: Number of digitiser samples between PFB input samples.

property window: int: Number of digitiser samples that contribute to each output spectrum.

class katgpucbf.fgpu.output.WindowFunction(*values)[source]

Bases: Enum

Window function to use in generate_pfb_weights().

DEFAULT = 1

HANN = 1

RECT = 2