PCM stands for Pulse Code Modulation. It is an uncompressed digital audio that is found in CDs, DVD-Audio discs, and digital audio file formats such as WAV, FLAC and ALAC. Popular high resolution audio formats such as Dolby TrueHD and DTS-HD Master Audio decode into PCM as well. For consumer purposes, PCM bit-depth generally ranges from 16 to 24 bits, with sample rates up to 192 kHz and higher, and it also has multichannel audio capabilities.
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David Elias is an independent musician who has been recording in DSD since 2000, releasing hybrid multichannel SACDs in 2003 and 2005 and pioneering DSD Downloads online in 2009. He has made a number of demo tracks available for OPPO customers in a variety of formats, including native DSD, PCM, and more recently, MQA. The nice thing about owning a player that supports a wide variety of formats is that you are able to decide for yourself whether you prefer DSD, PCM, or MQA audio.
Listen to these samples of "Vision of Her" on the OPPO and try to form your own opinion of what sounds "right" or "best" to you. The original DSF file used DSD technology for encoding. That is how the song was recorded and mixed and mastered. The other digital formats were created from the DSD stereo master as PCM encoded audio files. This transformation process used a software application from Korg called AudioGate. In these cases, AudioGate was used to "downsample" and convert the original DSD source audio file to the various PCM formats at varying lower resolutions.
If you are unsure about what audio hi-res is about, think of how high resolution photographs are presented. If you take a 12 megapixel digital photo as a clear image, it can have terrific quality. It can also be reduced to a very small JPG (say 200 pixels) at 72 dpi and still look quite good. However if you start with a 200x200 pixel graphic image and try to expand that to say 1400x1400 pixels, you will not see any improved quality in the result. In fact, it will probably look a lot worse! DSD gives you that very high quality source image which translates very well to other formats including PCM and vinyl.
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