Listen to a data channel
The Listen monitor plays a data channel in real-time over the speakers on the default audio device of a DMT workstation. At present a single channel is played. The channel data are resampled to 8kHz by linear interpolation to match the usual sampling rate for audio output devices. Optional high pass and low-pass filters may be applied to the data before the data are sent to the audio device.
The Listen command has the following syntax:Listen [<dmt-args>] [-gain <gain>] [-high <fHi>] [-low <fLow>] <channel>
<dmt-args> The standard DMT DatEnv arguments (e.g. -infile) -gain <gain> specify an absolute gain. If the gain isn't specified Listen will guess at a gain that will make the signal audible. -high <fHi> specify a maximum frequency. A filter is added with two real poles at <fHi> and two zeros at fNyquist. -low <fLow> specify a minimum frequency. A filter is added with two real poles at <fLow> and two zeros at 0 Hz. <channel> is the name of the channel to be listened to.
When Listen is launched, a control panel is displayed on the device specified by the DISPLAY environment variable. By default all audio ports are disabled. You must select the appropriate port.
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