signal_core 0.2.0

Format-agnostic multichannel signal engine: summary pyramids for fast zooming, display filters (SOS, zero-phase and streaming), re-referencing, channel quality and random-access byte sources. Pure Dar [...]

signal_core

signal_core is a signal engine for viewing large multichannel recordings and live streams. It is independent of any file format, pure Dart, and runs on all platforms, including the web. It provides the data handling behind signal_viewer and the indexed reading of large files in xdf.

API documentation

Installation

dart pub add signal_core

Components

Component	Purpose
SummaryPyramid	Minimum, maximum, mean and standard deviation over buckets of 64, 256, 1024… samples, so that a view of any length is drawn from a few thousand buckets
ChunkedSignalEngine	Answers EnvelopeRequests and ReadRequests for a recording that a format divides into chunks (ChunkedSignalIndex), with a bounded chunk cache, filtered tiles retained between requests, and derived (filtered, re-referenced) summaries built in the background
DerivedSpec, Sos, SosStreamFilter, applyReference, LiveProcessor	Display filters (zero-phase for recordings, streaming for live data), re-referencing and mean traces
QualityTracker	Per-channel flags for line noise, amplitude and flat channels
ByteSource	Random access to a file by path (native platforms), to a Blob (web) or to bytes in memory

The formats currently built on the engine are XDF, through the xdf package, and .hsd (libhyperscanner).