Search found 59476 matches

by steve
Sun Jan 07, 2018 2:52 pm
Forum: Windows
Topic: Bitstream corruption when recording SPDIF?
Replies: 2
Views: 315

Re: Bitstream corruption when recording SPDIF?

I doubt that we are going to be able to offer much help. Audacity interfaces with the computer sound system via PortAudio (http://www.portaudio.com/). Audacity handles audio data internally as 32-bit float. In most cases this means that there will be no rounding of data values that Audacity receives...
by steve
Sun Jan 07, 2018 12:08 am
Forum: Windows
Topic: 2.2.2 - crash using Sliding Time Scale
Replies: 7
Views: 2312

Re: 2.2.2 - crash using Sliding Time Scale

No need to resample down again. The exported file will be at the sample rate of the "project rate" (bottom left corner of the main Audacity window)
by steve
Sat Jan 06, 2018 9:02 pm
Forum: Windows
Topic: Does FFmpeg v2.2.2 really support AC3?
Replies: 2
Views: 440

Re: Does FFmpeg v2.2.2 really support AC3?

Can you import this file with Audacity?
test.ac3
(195.24 KiB) Downloaded 39 times
by steve
Sat Jan 06, 2018 5:26 pm
Forum: Nyquist
Topic: follow up How to generate arbitrary waveforms
Replies: 20
Views: 4167

Re: follow up How to generate arbitrary waveforms

http://www.audacity-forum.de/download/e ... ef-279.htm
In short, TERPRI prints an EOL character.
(the name "terpri" comes from "terminate print")
by steve
Sat Jan 06, 2018 5:21 pm
Forum: macOS
Topic: Generating violet noise
Replies: 12
Views: 1047

Re: Generating violet noise

Comparing signals is quite tricky, and not always intuitive. "Loudness" is a subjective measurement, dependent on how we hear things. Both 0 Hz and 22000 Hz are "silent" (zero "loudness"), because they are inaudible regardless of how "big" they are. There's an...
by steve
Sat Jan 06, 2018 4:18 pm
Forum: macOS
Topic: Generating violet noise
Replies: 12
Views: 1047

Re: Generating violet noise

Audacity's noise generators all generate random samples in the range +/- 1, which is then amplified to the required level. The highest (or most negative) sample value determines the "peak" level. Note that because they are random signals, very short selections are likely to have a peak amp...
by steve
Sat Jan 06, 2018 4:12 pm
Forum: Windows
Topic: Lost/Unsaved file
Replies: 9
Views: 911

Re: Lost/Unsaved file

Are the problem drives external (USB) drives? There's a lot of technical detail about USB drives that I don't know, but as a fluffy guideline, they tend to be more reliable when used for simple file transfer - copying a file from one drive to another. Writing data that is generated by an application...
by steve
Sat Jan 06, 2018 3:27 pm
Forum: macOS
Topic: Generating violet noise
Replies: 12
Views: 1047

Re: Generating violet noise

A simple way to directly generate short (just a few seconds) of violet noise To directly generate longer selections, Trebor's method is better. This code, when run in the Nyquist Prompt, allows you to specify the amplitude of the noise: ;control amp "Amplitude" float "" 0.8 0 1 ...
by steve
Sat Jan 06, 2018 3:18 pm
Forum: macOS
Topic: Generating violet noise
Replies: 12
Views: 1047

Re: Generating violet noise

A simple way to directly generate short (just a few seconds) of violet noise, is to run this code in the Nyquist Prompt effect: (setf ln (truncate len)) (setf ar (snd-fetch-array *track* ln ln)) (setf prev 0) (dotimes (i ln (snd-from-array 0 *sound-srate* ar)) (setf new (- 0.5 (rrandom))) (setf (are...
by steve
Sat Jan 06, 2018 3:06 pm
Forum: macOS
Topic: Generating violet noise
Replies: 12
Views: 1047

Re: Generating violet noise

1) Generate white noise
2) Apply the Equalization effect, using "Draw" mode, and set the graph with two points, one at 20 Hz, -60 dB, and another at 22000 Hz, 0 dB.
(see also: http://manual.audacityteam.org/man/equalization.html)
fullwindow-Equalization-000.png
fullwindow-Equalization-000.png (59.16 KiB) Viewed 778 times