Audacity Forum

Vinyl hasn't such a large frequency spectrum--it is rather a myth. I've learned this while analysing quadrophonic recordings. Most LP's produce frequencies up to 15 kHz, max 24 kHz. CD-4 (quadro sound) needs a spectrum up to 45 kHz. This is achieved by letting cut the master at half speed. For all o...

Cool. You lost me here: Where did this equation come from? (atan (+ (* s-1 c0) (* c-1 s0)) (- (* c-1 c0) (* s-1 s0))) (psetq c-1 c0 s-1 (* -1 s0)) This would probably be handled OO. oo? Well, the atan function works either with real or complex numbers (unfortunately the only nyquist function that c...

I've now employed another method that firstly doesn't need a limiter and secondly needs no lowpass update recursively. It splits the signal into sine and cosine and keeps tracking the instant phase. Excellent - are you doing that with FFT ? That's the sound of the left channel from the sample Audio...

Big question, why does Steve's code snippet produce such a horrible sound? Answer: Better ask, why does it produce sound at all? The code does an AM demodulation, i.e. the message is coded in the instant amplitude of the 30000 Hz carrier. CD-4 is modulated in "FM PM and SSB-FM" which is ve...

The most intuitive way would probably be to have a "Repair Tool", i.e. a brush with the 128 sample-width. You simply click where the audio should be repaired.

If the tracks are not related, the amplitude increase for mixing two tracks is in average 3 dB (instead of 6 dB). Exporting to 16 bit will clip of the higher peaks (above 0 dB). This distortion is much less obvious for tracks that are not correlated, the occasional peaks are simply not wide enough t...

You missed one. When Audacity plays all your tracks it just adds 'em up. It's a simple arithmetic process. Or maybe not that simple... Example: 4 identical tracks at 0 db or amplitude 1. This gives an overall amplitude of 4. That's equal to double twice the gain and brings all tracks to 12 dB in to...

But I don't see why Audacity just doesn't do that swap itself when the right channel is on top, instead of asking for extra steps. In effect, that is what happens with "Mix and Render". If "Make Stereo Track" takes account of the channel allocation of the two mono tracks, then h...

Or it could be "Swap Channels" in the track drop down menu. Personally, I'd find it nice if the channels could be treated separately without first splitting the stereo track. Either by selecting them through additional menu entries or by a very basic group/tree functionality. This means th...

In comparison, AIFF and RIFF support instruments, markers and loop points in there headers, so no problem to encode sample based sequences. I don't know what's all possible with *.wav however. Audacity seems to make usage of repeating patterns (blocks) too. However, 400 kB is really too short a file...