Stereo Or Mono; Playing Part Of A File - Townshend Computer Tools DAT-Link User Manual

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5.4 Stereo or Mono

whether problems in playback are due to the connections between the host computer

DAT-Link

and the

or in the connection to the digital audio equipment.

DAT-Link

On the

+, 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 proportional to the playback level.

The Pause LED is lit whenever the

externally. This may be due to synchronization with external equipment or due to

explicit control using the

5.4 Stereo or Mono

Unless the le being played contains a header with additional information, the

program assumes that the le data contains stereo data with the two chan-

naplay

nels interspersed. The rst sample in the le is for the left channel, followed by

the right channel, etc. If a dierent playback mode is required, the

be used. The option should be followed by one of the words

. These can be abbreviated to a single letter. The

stereo

and forces playback to either a single channel (left or right) or to both channels

(stereo or mono). The

mono

in the le on both 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 right channel will be silent.

5.5 Playing Part of a File

There are a number of options available for selecting a segment of a le for playback.

The

option selects a range of the le to playback. The

-r

range specied as

start-end

are respectively the rst and last sample numbers to play. Either

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.

DAT-Link

+ is paused either internally or

program.

naset

option plays back the same single-channel data stored

, or

start:end

start:+count

option can

-o

, or

left

right

mono

overrides any defaults

-o

ag is followed by a

-r

, where

and

start

end

may

start

end

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