The file required is generated inside the code, is linear interpolated and requires /dev/audio to work. Ensure you have this device, if not the download oss-compat from your OS's repository...
It lasts for about 8 seconds before exiting and saves a 65536 byte file to your working directory/drawer/folder as sinewave.raw. Use an oscilloscope to check the waveform generated...
It is entirely Public Domain and you may do with it as you please...
IKHz_SW_OSX.py
A DEMO mono _pure_ sinewave generator using standard text mode Python 2.6.7 to at least 2.7.3.
This code is EASILY modifyable to Python version 3.x.x...
This DEMO kids level 1KHz generator is mainly for a MacBook Pro, (13 inch in my case), OSX 10.7.5 and above. See below...... (0 Replies)
Hi all...
I don't think this has been done before but I am open to being corrected...
This batch file generates a 65536 byte binary file to give 8 seconds of pure sinewave at the earphone/speaker output(s)...
It uses ONLY a default Windows 32 bit installation, to Windows 7, except for the... (0 Replies)
There was an upload recently on generating a pseudo-random file when /dev/random does NOT exist.
This does not need /dev/random, /dev/urandom or $RANDOM either...
(I assume $RANDOM relies on the /dev/random device in some way.)
This code uses hexdump just because I like hexdump for ease of... (2 Replies)
This is a small program as a tester for a basic sweep generator for bandwidth testing of AudioScope.sh.
This DEMO is only capable of 4KHz down to about 85Hz and back due to the low bit rate, but it is proof of concept for a much wider variant using a much higher bit rate.
The file generated... (4 Replies)
Ok guys, gals and geeks...
As from today I am starting to learn awk in earnest doing something totally different.
I am going to create a pseudo-Audio_Function Generator centred around OSX 10.11.x minimum. The code below is a tester to see what the possibilities are.
All waveforms will be... (11 Replies)
Hi all...
I intend to do an Audio Function Generator using Awk, (already started thanks to Don), but the biggest thing I have struggled with was variable frequency.
I was going to generate differing sized waveforms on the fly but that would that would mean the frequencies are dependent on any... (2 Replies)
Hi all...
Well I have not been inactive but working out how to make OSX 10.14.x command line audio player have a variable sample rate.
This is a back door as afplay does not have a sample rate flag unlike aplay for ALSA, in Linux flavours.
This is a DEMO only but a derivative of it will... (2 Replies)
Discussion started by: wisecracker
2 Replies
LEARN ABOUT DEBIAN
na_record
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