SilenceDetector class

Processes the stream of microphone intensity to notify when a silence period begins of ends based on the values received.

The class achieves its purpose by:

  • Receiving a continuous stream of decibel levels from the microphone.
  • Maintaining a history of recent intensity values to analyze patterns.
  • Detecting transitions between silence and non-silence based on the calculated threshold, considering at least 90% of samples as silent to confirm a silent period.
  • Signaling via a StreamController when silence begins or ends.

Constructors

SilenceDetector({required Stream<double> decibelsStream})
decibelsStream is a stream of microphone intensities changes received every X amount of time. The values are negative, where values closer to zero mean the microphone is picking a loud sound.

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
stream → Stream<bool>
no setter

Methods

clear() → void
dispose() → void
getMaxSilenceIntensity() → double
Calculates the maximum value that is considered silence.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Properties

minimumVariance ↔ double
getter/setter pair
minPercentTolerance ↔ double
The minimum percentage of silence a list of values can have as silence to be considered a period of silence. This value is rounded up in case of floating point result.
getter/setter pair
minSilenceCount ↔ int
The amount of samples that have a constant amount of silence or loud noise to begin to conside a "Period of silence" or "Period of loud sounds".
getter/setter pair
totalSamplesToKeep ↔ int
The amount of instances of the microphone to keep in the _history list.
getter/setter pair