![]() ![]() Programsįor spectral analysis, we recommend using either Adobe Audition (Windows or macOS), Audacity (Windows, macOS, Linux), and SoX (Windows, macOS, Linux - command line only). It's a lossy to lossless transcode, which is bad. flac, it is 21.8 MB, and it sounds okay.īut whoa, does that look anything like what a regular FLAC spectral should look like? No! This file was transcoded from MP3 192kbps (CBR) to FLAC. (Programs like AudioIdentifier are not reliable at detecting transcodes.)įor example, the spectral below is of a FLAC file: the file extension is. The only way to verify that this song is truly a lossless file and not a transcoded file is by looking at its spectral. How are spectrals helpful when trying to detect transcodes? Say you download a song in FLAC from a blog. MP3 128kbps (CBR) has a frequency cut-off at 16 kHz. MP3 V2 has a frequency cut-off at 18.5 kHz. MP3 192kbps (CBR) has a frequency cut-off at 19 kHz. MP3 V0 has a frequency cut-off at 19.5 kHz. MP3 256kbps (CBR) has a frequency cut-off at 20 kHz. MP3 320kbps (CBR) has a frequency cut-off at 20.5 kHz. MP3s also tend to have a "shelf" at 16 kHz (you'll see it in the spectrals). MP3ĭifferent types of MP3s have different frequency cut-offs. It looks much different, right? But it's still a lossless spectral! Notice how "white noise" (the light purple) still extends to 22 kHz, even though those frequencies aren't used. The example above was a pop song, so most of the frequencies were represented. ![]() However, different genres have different-looking spectrals. Since lossless to lossless transcoding preserves all of the data in a music file, the spectral of a lossless song will look the same in FLAC, WAV (PCM), ALAC, etc. Songs on a retail CD and lossless songs have frequencies that extend all the way to 22 kHz. Every file has a relatively standard frequency cut-off.Ĭlick on any of the spectrals below to view it in a higher resolution. Since spectrals show all the data in a file, they are helpful tools to use when you're trying to decide whether or not a song has been transcoded. Humans have a hearing range from about 20 Hz - 20kHz (20,000 Hz). Frequencies are measured in hertz (Hz) and kilohertz (1,000 Hz). All of the frequencies are displayed on a spectral diagram ("spectral" for short), which is a graph of all the frequencies vs. Every music note has a specific frequency: lower notes have lower frequencies and higher notes have higher frequencies. Spectral analysis is a visual way to display the data in a music file. ![]()
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