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% dtas-xdelay(1) dtas user manual
=head1 NAME
dtas-xdelay - play audio with a crossover delay
=head1 SYNOPSYS
dtas-xdelay [OPTIONS] INPUT1 INPUT2 DELAY
=head1 DESCRIPTION
dtas-xdelay will delay an audio band by a given delay (in seconds or
fractions thereof). This can be useful for tuning a sub/sat speaker
system. It is intended for use a dtas-player sink command as displayed
in the synopsis.
The INPUT arguments (/dev/fd/lo and /dev/fd/hi) are automatically
changed by dtas-player to match the given file descriptors of the pipes.
Both descriptors receive the same audio data, but will be split using a
Linkwitz-Riley crossover. The high-band (second argument) will be
delayed by default.
=head1 EXAMPLE
To set this via dtas-player to delay the high frequencies by 20ms.
dtas-ctl sink ed SINKNAME \
command='dtas-xdelay /dev/fd/lo /dev/fd/hi 0.020'
=head1 OPTIONS
=over
=item -x, --crossover-frequency FREQUENCY
Frequency at which to set the crossover. This defaults to 80 (Hz).
=item -l, --lowpass-delay
Delay the lowpass frequency instead of the highpass one.
=back
=head1 ENVIRONMENT
=over
=item SOXFMT, CHANNELS
These environment variables are automatically set if
used as a dtas-player sink
=item DTAS_PLAYER_SOCK - the path to the dtas-player control socket
This defaults to ~/.dtas/player.sock
=item AUDIODEV, AUDIODRIVER
These influence the device/driver used by L<play(1)>.
Consult L<play(1)> for details.
=item SOX_OPTS
This influences options passed to L<sox(1)> or L<play(1)>
Consult L<sox(1)> for details.
=back
=head1 NOTES
The author of this (Eric Wong) knows little about signal processing and
is just parroting things he's learned on the sox documentation and
mailing list. Corrections to the L<mailto:dtas-all@nongnu.org> mailing list
are greatly appreciated.
=head1 CONTACT
All feedback welcome via plain-text mail to: L<mailto:dtas-all@nongnu.org>
Mailing list archives available at L<https://80x24.org/dtas-all/>
and L<https://lists.gnu.org/archive/html/dtas-all/>
No subscription is necessary to post to the mailing list.
=head1 COPYRIGHT
Copyright 2013-2016 all contributors L<mailto:dtas-all@nongnu.org>
License: GPL-3.0+ L<https://www.gnu.org/licenses/gpl-3.0.txt>
=head1 SEE ALSO
L<dtas-player(1)>, L<dtas-player_protocol(7)>, L<dtas-ctl(1)>,
L<sox(1)>, L<play(1)>
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