| Table of content: | ||||
| Encoders | ||||
| Constant Bitrate: | Test procedure (CBR) | Results CBR | Encoding time (CBR) | |
| Variable Bitrate: | Test procedure (VBR) | Results VBR | Encoding time (VBR) | Average bitrate of VBR files |
| Conclusion and optimal settings | ||||
| Links |
The four "pure" mp3 encoders are tested with fixed bit rates from 96 to 192 kbps (96, 128, 160, 192).
Fraunhofer and BladeEnc encoders used stereo encoding, while Lame and Gogo used joint stereo encoding.
Fraunhofer and gogo use "normal quality" encoding at every bit rates.
Above 160 kbps, Lame encoder used "high quality" encoding parameter,
rather than "normal" encoding parameter under 160 kbs.
The spectrogram software used on the test is named Spectrogram. Parameters are : 90dB scale range, 3ms time scale, linear frequency scale and 1024 FFT points.
To analyze the spectrogram of mp3 files, they have first to be converted to wav files. This is performed by default with CDex software. A comparison of different decoders (mp3 to wav conversion) is also presented in another section.