06-07-2019
Thanks MadeInGermany, I will try this out on my main code.
I limited the DEMO to 6000Hz because it kept the BYTE manipulation easy to understand using only one little endian word per sample and byterate instead of the two little endian words for both. Also 8 bits unsigned per sample, and mono eliminates the need for other sections to be altered.
As an addendum the WAV file format:
Microsoft WAVE soundfile format
8 More Discussions You Might Find Interesting
1. Programming
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)
Discussion started by: wisecracker
0 Replies
2. Shell Programming and Scripting
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)
Discussion started by: wisecracker
5 Replies
3. Windows & DOS: Issues & Discussions
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)
Discussion started by: wisecracker
0 Replies
4. OS X (Apple)
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)
Discussion started by: wisecracker
4 Replies
5. OS X (Apple)
This site is the first to get this snippet.
It will capture an audio recording of any time length within the limits of OSX's QuickTime Player's capablility...
A shell script derivative of this will be used as a further capture for CygWin's AudioScope.sh.
Thoroughly read ALL the comments in... (0 Replies)
Discussion started by: wisecracker
0 Replies
6. OS X (Apple)
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)
Discussion started by: wisecracker
11 Replies
7. OS X (Apple)
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)
Discussion started by: wisecracker
2 Replies
8. Shell Programming and Scripting
This is a DEMO shell script to generate a simple graticule and plot inside it...
Apologies for any typos...
it is another building block along with my other two shell uploads recently to start a semi_serious project of an Terminal_AudioScope...
The fist upload I posted recently was to show... (83 Replies)
Discussion started by: wisecracker
83 Replies
LEARN ABOUT DEBIAN
srconv
SRCONV(1) The Canonical Csound Reference SRCONV(1)
NAME
srconv - Converts the sample rate of an audio file. .
DESCRIPTION
Converts the sample rate of an audio file at sample rate Rin to a sample rate of Rout. Optionally the ratio (Rin / Rout) may be linearly
time-varying according to a set of (time, ratio) pairs in an auxiliary file.
SYNTAX
srconv [flags] infile
INITIALIZATION
Flags:
o -P num = pitch transposition ratio (srate / r) [don't specify both P and r]
o -P num = pitch transposition ratio (srate / r) [don't specify both P and r]
o -Q num =quality factor (1, 2, 3, or 4: default = 2)
o -i filnam = auxiliary breakpoints file (no breakpoint by default. i.e. No ratio change)
o -r num = output sample rate (must be specified)
o -o fnam = sound output filename
o -A = create an AIFF format output soundfile
o -J = create an IRCAM format output soundfile
o -W = create a WAV format output soundfile
o -h = no header on output soundfile
o -c = 8-bit signed_char sound samples
o -a = alaw sound samples
o -8 = 8-bit unsigned_char sound samples
o -u = ulaw sound samples
o -s = short_int sound samples
o -l = long_int sound samples
o -f = float sound samples
o -r N = orchestra srate override
o -K = Do not generate PEAK chunks
o -R = continually rewrite header while writing soundfile (WAV/AIFF)
o -H# = print a heartbeat style 1, 2 or 3 at each soundfile write
o -N = notify (ring the bell) when score or miditrack is done
o -- fnam = log output to file
This program performs arbitrary sample-rate conversion with high fidelity. The method is to step through the input at the desired sampling
increment, and to compute the output points as appropriately weighted averages of the surrounding input points. There are two cases to
consider:
1. sample rates are in a small-integer ratio - weights are obtained from table.
2. sample rates are in a large-integer ratio - weights are linearly interpolated from table.
Calculate increment: if decimating, then window is impulse response of low-pass filter with cutoff frequency at half of output sample rate;
if interpolating, then window is impulse response of lowpass filter with cutoff frequency at half of input sample rate.
CREDITS
Author: Mark Dolson
August 26, 1989
Author: John ffitch
December 30, 2000
AUTHORS
Barry Vercoe
MIT Media Lab
Author.
Dan Ellis
MIT Media Lab,
Cambridge
Massachussetts
Author.
COPYRIGHT
5.10 08/01/2011 SRCONV(1)