NA_RECORD(1)						    BSD General Commands Manual 					      NA_RECORD(1)

NAME

     na_record -- record waveform from audio device

SYNOPSIS

     na_record [-h] [-f sampling rate] [-audiodevice device] [-time seconds] [-o file] [-otype type] [-ostype sample type] [-F sample rate]
	       [-obo MSB | LSB | native] [-oswap] [-p audio device protocol]

DESCRIPTION

     na_record records digital audio data from the system's audio input device and writes it to the specified file.  It supports a variety of out-
     put file formats and native audio devices.

     The following option flags are recognized:

	   -h	 Prints a short summary of usage to standard output.
	   -f sampling rate
		 Sets the input sampling rate (in samples per second, i.e. Hz).  Not all devices support all sampling rates, so it may be desire-
		 able to set this separately from the output sampling rate.
	   -audiodevice device
		 Sets the audio device to record from, if supported by the audio protocol chosen (e.g. /dev/dsp, /dev/audio)
	   -time seconds
		 Stops recording after the specified number of seconds.
	   -o file
		 Writes sound output to the specified file
	   -otype type
		 Specifies the file format to use for output. Supported types currently include nist, est, dsps, snd, riff, aiff, audlab, raw, and
		 ascii. The -h flag will show the most accurate list.  The default type is nist.
	   -F sampling rate
		 Sets the output sampling rate (again, in samples per second, i.e. Hz). If this differs from the input sampling rate, resampling
		 will be done. Defaults to 16000Hz.
	   -obo byte order
		 Sets the output byte order. Supported values are MSB, LSB, and native. Many file formats have their own byte order, or are byte
		 order independent, so this isn't tremendously useful except for raw data. The default is the native byte order for the system
		 audio device.
	   -oswap
		 Swap bytes when saving to output.
	   -ostype sample type
		 Sets the sample type of the output. Suported values are short, mulaw, byte, or ascii. Again, this is usually implied by the file
		 format, so should only be used for raw data.  The default is short (i.e. 16-bit PCM).
	   -p audio device protocol
		 Selects an audio device protocol (i.e. type of audio device) to use.  This varies between different installations of Speech
		 Tools, but defaults to the most 'native' audio device, usually Open Sound System on Linux and *BSD and /dev/audio on Solaris.

ENVIRONMENT

	   NA_PLAY_PROTOCOL
		 Audio protocol to use (as in the -p flag)
	   NA_PLAY_HOST
		 Host to record audio from when using a network audio protocol.

EXAMPLES

     To record five seconds of audio from /dev/dsp1 (on Linux) to foo.wav in RIFF format at 32kHz:
	   $ na_record -time 5 -audiodevice /dev/dsp1 -o foo.wav -otype RIFF -f 32000
     To record one second of audio to bar.wav in raw format in 8kHz mu-law:
	   $ na_record -time 1 -o bar.wav -otype raw -ostype mulaw -f 8000

BUGS

     The -time argument only accepts integer values (though the usage message implies otherwise)

SEE ALSO

     na_play(1)

Edinburgh Speech Tools						   April 4, 2001					    Edinburgh Speech Tools