Search found 59476 matches

by steve
Mon Apr 15, 2013 2:38 pm
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

It looks like the Hanning window is one of the "better" ones for making the white diagonal stripe look neat, but Blackman-Harris is "best." "Best" depends on what it's for. For making clear white lines, yes the Blackman-Harris is pretty good. The article that I posted ...
by steve
Mon Apr 15, 2013 2:36 pm
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

Try "Plot Spectrum" as well.
Hanning173.png
Hanning Window 172.3 Hz Sine
Hanning173.png (56.77 KiB) Viewed 1758 times
rectangle173.png
Rectangle Window 172.3 Hz Sine
rectangle173.png (56.66 KiB) Viewed 1758 times
Hanning190.png
Hanning Window 190 Hz Sine
Hanning190.png (59.06 KiB) Viewed 1758 times
rectangle190.png
Rectangle Window 190 Hz Sine
rectangle190.png (59.38 KiB) Viewed 1758 times
by steve
Mon Apr 15, 2013 2:21 pm
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

This looks to be pretty close to being centred on 172.3 Hz - perhaps it is a fraction off, but I'd have thought close enough.
firsttrack003.png
Spectrogram of 172.265625 Hz sine tone
firsttrack003.png (9.51 KiB) Viewed 1761 times
by steve
Mon Apr 15, 2013 8:04 am
Forum: GNU/Linux
Topic: compilation error
Replies: 3
Views: 11890

Re: compilation error

Check which version of FFMpeg you have installed. Currently supported versions are 0.5 through 0.8. http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#linff If you don't have a supported version of FFMpeg, the easiest workaround is to build Audacity without FFMpeg support. The f...
by steve
Mon Apr 15, 2013 6:19 am
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

Center, or bottom? 173 Hz Centre I believe (but I could be wrong ;)) This is the list of frequencies in Plot Spectrum for an FFT size of 256 and a sample rate of 44100 Hz: Frequency (Hz) 172.265625 344.531250 516.796875 689.062500 861.328125 1033.593750 1205.859375 1378.125000 1550.390625 1722.6562...
by steve
Mon Apr 15, 2013 6:15 am
Forum: Windows
Topic: MP3 Recording is distorted but no red lines in Audacity
Replies: 4
Views: 598

Re: MP3 Recording is distorted but no red lines in Audacity

whats that sound wrote:Recorded my band with Tascam Hand Held Recorder on lowest recording level
As Koz wrote, if you play in a loud band, you are probably overloading the microphone.
A low sensitivity dynamic microphone plugged into it will probably do the trick.
by steve
Mon Apr 15, 2013 2:56 am
Forum: Feature Request Archive
Topic: Labels wish-list
Replies: 67
Views: 15846

Re: Labels wish-list

1. Ctrl-drag can move a label vertically to a different label track without changing its horizontal position. (Analogous to ctrl-drag in the time-shift tool.) There's quite an easy workaround for that: Click in the label that you want to replicate and press Enter (so that you're not in label edit) ...
by steve
Sun Apr 14, 2013 11:02 pm
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

For Nyquist programming, the Hann (Hanning) window function is often a good choice, both for its characteristics and because it is easy to generate in Nyquist. ; wlen is the windowsize in seconds (local time) (mult 0.5 (sum 1 (osc (hz-to-step (/ wlen)) wlen *sine-table* -90))) http://en.wikipedia.or...
by steve
Sun Apr 14, 2013 10:58 pm
Forum: Windows
Topic: Help me understand spectrograms
Replies: 14
Views: 2305

Re: Help me understand spectrograms

Generate a sine wave at 172.265625 Hz. That makes the period equal to 256 samples at 44.1kHz sampling So that is a special case where the signal lies dead centre of one of the frequency bands. Take a more typical case where the frequency is not dead centre and you will see that Rectangle window giv...
by steve
Sun Apr 14, 2013 10:37 pm
Forum: macOS
Topic: 'Cut' button doesn't work and 'Cut' in Edit is missing
Replies: 5
Views: 4102

Re: 'Cut' button doesn't work and 'Cut' in Edit is missing

The Cut menu option is in "Edit menu > Remove Audio or Labels > Cut" http://manual.audacityteam.org/o/man/edit_menu.html#cut
Note that playback must be stopped (not playing, recording or paused).