Provides binaural audio along with pre-defined themes. This module can be used independent of Emacspeak.
A binaural beat is an auditory illusion perceived when two different pure-tone sine waves, both with frequencies lower than 1500 Hz, with less than a 40 Hz difference between them, are presented to a listener dichotically (one through each ear). For example, if a 530 Hz pure tone is presented to a subject’s right ear, while a 520 Hz pure tone is presented to the subject’s left ear, the listener will perceive the auditory illusion of a third tone, in addition to the two pure-tones presented to each ear. The third sound is called a binaural beat, and in this example would have a perceived pitch correlating to a frequency of 10 Hz, that being the difference between the 530 Hz and 520 Hz pure tones presented to each ear. For more details, see https://en.wikipedia.org/wiki/Binaural_beats.
This module implements a set of user-facing commands for generating binaural beats. The commands are organized from high-level commands that play predefined binaural beats to lower-level commands that can be used to create new effect sequences.
All binaural beat sequences are played with a relatively low gain — they are designed to be heard in the background and when effective blend fully into the background. You can increase the overall volume of all binaural beat sequences by customizing
— default is 0.
These commands can be called directly to play one of the predefined binaural beats.
sox-rev-up: A set of
binaural beats designed for use at the start of the day.
Transitions from Dream
-> Think
->Act ->
Focus.sox-wind-down: A set of
binaural beats for winding down at the end of the day.
This can be thought of as the reverse of sox-rev-up and the sequence transitions
from Act ->
Think ->
Dream ->Sleep.sox-turn-down: Designed
for falling asleep. This sequence starts with a short
period of Dream before
moving to Sleep.sox-relax: A variant of
the previous sequence, sox-relax spends equal time in
Dream and Sleep.sox-binaural: Provide a
completion-based front-end to playing any one of the
predefined binaural effects (Delta, Theta, Alpha, Beta, or Gamma. The previously defined sequences
are built up using these effects.sox-beats-binaural:
Plays a collection of binaural beats, prompting for
carrier and beat frequencies for each tone. The
predefined sequences listed earlier were created after
first generating experimental beat-sequences using this
command.sox-slide-binaural:
Prompts for two binaural effects (see above) and
generates a binaural beat that slides from the first effect to the
second over a specified duration.sox-chakras: Pick
amongst one of a predefined set of sequences designed for
Chakra meditation.sox-tone-binaural:
Generate a simple binaural beat with a single carrier
frequency.sox-tone-slide-binaural:
Generate a tone that slides from one binaural beat to
another.Play binaural audio with beat-spec specifying the various tones. Param ‘beat-spec-list’ is a list of ‘(carrier beat) tuples. (fn LENGTH BEAT-SPEC-LIST GAIN)
Play each chakra for specified duration. Parameter ‘theme’ specifies variant. (fn THEME DURATION)
Play relax set of binaural beats for ‘length’ seconds. (fn LENGTH)
Play rev-up set of binaural beats for ‘length’ seconds. (fn LENGTH)
Play specified binaural slide from ‘name-1’ to ‘name-2’. (fn NAME-1 NAME-2 DURATION)
Play binaural audio with carrier frequency ‘freq’, beat ‘beat’, and gain ‘gain’. (fn LENGTH FREQ BEAT GAIN)
Play binaural audio with carrier frequency ‘freq’, beat ‘beat-start’ -> ‘beat-end’, and gain ‘gain’. (fn LENGTH FREQ BEAT-START BEAT-END GAIN)
User specified offset that is added to default gain when generating tones using SoX, e.g., for binaural beats.
Default Value:
0
Scale factor used to compute slide duration when moving from one binaural beat to another.
Default Value:
5.0