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 even number of bytes as odd numbered bytes could never create a symmetrical waveform like a sinewave or alternatively have a pre calculated look up table of lots of waveforms and sizes...
Then VOILA, a little lateral thinking created this idea; how about using a back door and forcing a .WAV file to use a different RATE inside its header.
Well it WORKS! WOOHOO...
This is a bash DEMO and has no error checking.
It suffers from aliasing at LF and minor frequency error on HF with and 8 byte sinewave set of values as because of the sampling frequency used.
Results, MBP OSX 10.7.5, default bash terminal.
Enjoy finding simple solutuons to often bery difficult problems...
Interesting solution! I'm surprised it can tell the diff between 6000 and 6001 hz, most audio devices run at fixed frequencies and most players don't bother correcting. Using your much-beloved sox utility on a fixed-rate raw file might give you more reliable and portable control -- resample it to one rate and force it to output at another rate.
Files are not needed if you are using SOX and piping.
An ultra simple string piped into sox without the need for files at all...
But I am NOT using SOX here but the very, very limited afplay audio player for OSX. afplay cannot replay raw files only a few basic formats of which .WAV is one.
Results:-
Just change the sample speed inside SOX from 8000 to anything you like within limits.
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)
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)
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)
I'm trying to record audio using Audacity 2.0.5 installed from SlackBuilds. My system is 64-bit Slackware 14.1 and a sound card is Intel HD Audio. I didn't change my sound system to OSS. (Default sound system in Slackware 14.1 is ALSA, isn't it?) First, I set Internal Microphone slider in KMix... (2 Replies)
A very simple crude sinewave generator.
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... (5 Replies)
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,
Could anyone help me with the following question, if I have two colums (names and frequency) as follows in a file called name.txt
Michael 1
Jones 1
Ben 2
Rebeca 4
David 1
and I want to use bash script called freqnames.sh that takes one argument (name) and the output should be... (3 Replies)
:cool: after installing solaris 10 5/08/09 directory the computer rebooting then the massage "out of frequency" appear.i want a solution first
second my main board is GA-MA780G UD3H (14 Replies)