Townshend Computer Tools DAT-Link - 5.3 Front Panel Indications; 5.4 Stereo or Mono; 5.5 Playing Part of a File

5.4 Stereo or Mono 53
whether problems in playback are due to the connections b etween the host computer
and the DAT-Link or in the connection to the digital audio equipment.
On the DAT-Link +, there are a number of additional front-panel indications. The
top Left and Right Level LED's indicate when the playback level exceeds -1 dB
relative to full-scale. This is often indicative that clipping is taking place. The
lower Level LED's provide activity indicators that are lit when the playback level
exceeds -30 dB. The intensity of this LED is prop ortional to the playback level.
The Pause LED is lit whenever the DAT-Link + is paused either internally or
externally. This may b e due to synchronization with external equipment or due to
explicit control using the naset program.
5.4 Stereo or Mono
Unless the le b eing played contains a header with additional information, the
naplay program assumes that the le data contains stereo data with the twochan-
nels interspersed. The rst sample in the le is for the left channel, followed by
the rightchannel, etc. If a dierent playback mode is required, the -o option can
be used. The option should b e followed by one of the words left , right , mono ,or
stereo . These can be abbreviated to a single letter. The -o overrides any defaults
and forces playback to either a single channel (left or right) or to b oth channels
(stereo or mono). The mono option plays back the same single-channel data stored
in the le on b oth output channels.
For example,
naplay -oleft file
will transfer the single channel samples from the le to the left channel of the DAT
machine. The rightchannel will b e silent.
5.5 Playing Part of a File
There are a numb er of options available for selecting a segment of a le for playback.
The -r option selects a range of the le to playback. The -r ag is followed bya
range specied as start-end , start:end ,or start:+count , where start and end
are resp ectively the rst and last sample numbers to play. Either start or end may
be omitted in which case the beginning or end of the le is used.
naplay -r 8000:16000 file
will begin playback at the 8,000th sample in the le and stop at the 16,000th sample.