![]() Track 4 - Uncorrelated stereo material taxes the codec ability to take advantage of common material between left and right channels. Many codecs will produce a tunnel effect on voice. Track 3 - Female voice is the most difficult test for codec voice performance. Track 2 - An abundance of high frequency energy will cause high frequency smearing in many codecs. Many poorly designed codecs will smear this in stereo. This can be verified by listening to the mono sum or the mono PCM sample. Track 1 - There is a slight left and right channel delay caused by slight misalignment of the analog tape recorder used to master this recording. The source audio extraction used software error correction and is thus bit-accurate. There were no physical cables or any analog-to-digital or digital-to-analog conversions in the extraction process. The source audio was digitally extracted from the original label CDs. ![]() ![]() We chose these particular audio sources because they tend to stress lossy codecs for various reasons, which will become apparent after you listen to some of these samples. It is one of the most comprehensive comparisons available on the Internet. This section allows you to assess the subjective audio quality of different permutations of several currently available lossy audio codecs. Opticodec-PC 1010 PE Opticodec-PC 1010: Codec Comparisons Audio Files ![]()
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