11
votes
Accepted
How do you compute the bitrate of a WAV file?
Here is how you calculate the constant bitrate (CBR) of uncompressed audio:
Bits Per Second (bps) = Sample Rate (Hz) * Word Length (bits) * Channel Count
Which for 44.1 KHz, 16 bit, 2 Ch. (stereo) ...
- 3,782
4
votes
Accepted
Can compressed music files be adequately recovered by remastering?
GIGO [garbage in, garbage out] does apply...
...however - a good mix, master or especially restoration engineer could pull apparent newness out of a low quality file - that's essentially the same ...
- 8,405
3
votes
Accepted
44100 Hz encoded in 24bit vs 16bit
It seems that as defined by the CDDA Red Book, CD quality is 16 bit with a maximum sample rate of 44.1 kHz. I understand 44.1kHz was chosen due to human hearing limitations so I assume 16 bit was ...
- 1,578
3
votes
What frequency/bit depth were the Beatles recorded at?
The article you read has either been misinterpreted or was monstrously misleading. It is possible that what they were referring to was the fact that the frequency response required from an analogue ...
- 8,815
3
votes
Accepted
how to list bit depth and bit rate of all. files in a set of nested folders?
SoX (Sound Exchange), the self-described Swiss Army knife of sound processing programs is super-useful for these kind tasks.
soxi is the specific tool to list audio file information and on Linux (or ...
- 171
3
votes
Accepted
Bit depth calculation doesn't seem to add up
It's an MP3 file. You can't deduce anything from that other than the fact that it's probably got a bit depth of 16 bits. Try the same exercise but using a WAV file. You will have better luck. MP3 is a ...
- 8,815
2
votes
How to convert a stereo MP3 to mono MP3
On Linux systems like Ubuntu, you can use ffmpeg:
ffmpeg -i input.mp3 -c:a libmp3lame -q:a 2 -ac 1 output.mp3
where:
-c:a libmp3lame: The audio codec to use
-q:a 2: The audio quality (bitrate), see ...
- 171
2
votes
Can compressed music files be adequately recovered by remastering?
Mp3 is a lossy compression format, the removal of frequencies is permanent. There are lossless files such as flac files which 'pack' the file down to a smaller file size that can then be 'unpacked'. ...
- 242
2
votes
MP3 and bitrate
Your assumption that bitrate = bitdepth * channels * samplerate is true for raw PCM encoded audio. It is not true for bitrate reduction encodings, be it lossless (as flac) or lossy (as mp3).
The ...
- 2,834
2
votes
What joint stereo bitrate is equivalent to 64k mono?
Joint stereo is only really useful for actual stereo recordings. What you are recording here (with two microphones on a table) is actually dual-mono, which is very different to "stereo" as there is no ...
- 8,815
2
votes
What is Tidal's 'Master' Quality sample rate and bit depth?
Fi: 44.1khz/16bit (1411kbps)
Master: 96khz/24bit (4608kbps) Pitchfork Article
Note that only ~30,000 tracks are MASTER quality right now
You can tell that Master is available by the M symbol
and ...
- 292
2
votes
MP3 Psychoacoustic Cut-off Frequencies for Low-Bitrate Presets
Here is a tentative answer based on the 192kHz 24-bit Japanese female speech sample:
First I generate the test files from the sample file, sample02.wav:
for br in 8 16 24 32 40 48 56 64 80; do
...
- 131
1
vote
Spotting a fake flac using spectrogram
This looks "extended" because of the (most probably) linear scale that your spectrogram is using on the frequency axis. It should look way more common if you switch it to log or similar.
@...
1
vote
44100 Hz encoded in 24bit vs 16bit
The theory around sampling contains quite a bit of mathematics. Leaving that aside, let us look att the practical aspects of your questions.
In practice, today, there are only two effects of sample ...
- 1,519
1
vote
Accepted
What should be the bit-rate & sample-rate settings, if I were to convert a WebM audio file to MP3?
The audio is encoded using opus, which is a high quality codec. When decoding from Opus, you will likely want to go via PCM - 16 bit at 48000. The more significant parameter with mp3 encoding will be ...
- 8,815
1
vote
Accepted
What frequency/bit depth were the Beatles recorded at?
Looking at the specs of the IBM 2401 tape drive from that era, you can see it's at least more complicated than that. The fastest of the 3 models recorded 90 kbyte/s while running the tape at 112.5 ...
- 1,578
1
vote
What frequency/bit depth were the Beatles recorded at?
There is no way to compare them because one is analog and one is digital. The way to calculate kbps is:
bit depth * sample rate * channels
Neither vinyl nor cassettes use bit depth or sample rates. ...
- 1,000
1
vote
Accepted
Compare audio samples with different bitrates
There's no easy way to measure the perceptual differences (i.e. as perceived by an average audience) between different audio encodings or bitrates.
The common way to do these tests is ABX tests.
...
- 2,834
1
vote
Can compressed music files be adequately recovered by remastering?
You could take a look at Zynaptiq Unchirp and Unfilter, but they are expensive options. It's not guaranteed to work but it's an option worth demoing. It really depends on how important these files are ...
- 374
1
vote
How to transfer 5.1 surround signal from computer to receiver using S/PDIF?
Let's assume that what you call 5.1 Dolby is Dolby Digital (aka ac3 codec). That is what your receiver expects.
1 - Any s/pdif interface can output ac3 bitstream (it is part of the standard).
2 - As ...
- 2,834
1
vote
How do you compute the bitrate of a WAV file?
Unless I'm getting my math terribly wrong, since standard CDs are stereo these days and there are 44100 samples in a second, each worth 16 bits, then:
2 * 16 * 44100 = 1411200 bps
Which in turn ...
- 175
1
vote
Accepted
LAME bitrate and lowpass filters
Source:
http://wiki.hydrogenaud.io/index.php?title=LAME#Recommended_settings_details
Deeper source(code):
https://github.com/rbrito/lame/blob/origin/libmp3lame/lame.c#L211
Update:
--preset insane ...
- 166
Only top scored, non community-wiki answers of a minimum length are eligible