Thanks for your interest in the CS43130 hi-fi DAC. It's always good to see discussion taking place! As you noted, the data sheet for this product is by request on our website, and we do that primarily because of competitive reasons. It's a support request form that gets channeled to a sales rep for follow up. Regarding the 512 single-cell DAC elements that form the DAC architecture of the CS43130, they're designed in a sequential method so that each element uses a clean clock source as it's reference and doesn't inherit jitter from the previous element, so that by the end of the 512 element chain, the audio signal is clean. In addition the elements sequentially filter out the unwanted frequencies to stop them affecting the wanted audio frequencies. The hard task is designing the element architecture, plus hooking them up together in such a way as to make this work and at the same time, make sure the actual sound produced from the DAC is as good as possible. If you'd like to follow up with me at firstname.lastname@example.org I'd be glad to provide additional technical information and see what we can do to answer your questions.
@MrAnalog--I am asking Cirrus to address your interest in CS43130 architecture. Unfortunately, I cannot change the policy of a supplier. You may have to request a datasheet as they suggest, but I have contacted Cirrus and asked them to address your interest.
But I am sure that if you directly contact them as an interested designer that they would help you.
Steve, where's the detail on the CS43130? "512 single-cell DACs" sounds like an interesting approach but there's no clue about how it actually works.
I tried finding some information on the web but what I found was that "512 single-cell DACs" is simply a bit of investor bait. Cirrus has a product page but it has no detail either. The datasheet is "available by request".
Steve, with your position in the industy you should be able to get some real news on this part.
Steve, thanks for this new post, it is very interesting.
Not so far away in time, the most important measure taken into account when delivering multimedia content, images, video or audio, to a human end-point listener was how this content was perceived, the quality in terms of perception. That still applies to voice transmission over telephone "lines" and video content broadcasting in digital television.
For that and other reasons MP3 and other compression formats have been so sucessful, but at the cost of lossing data.
"Similar to MP3, Free Lossless Audio Codec (FLAC) is virtually lossless", FLAC is similar to MP3 as it serves for compressing audio, they also work as audio data containers, but the 100% reproduction fidelity (input and output streams are bit-to-bit identical) which is achievable by FLAC can not be obtained from MP3.
MP3HD, from Technicolor, on the contrary, does allow to obtain a lossless compression-decompression process while maintaining compatibility with MP3. But this second feature is, to my opinion, a fake. This format simply incorporates two data streams in the same file, one stream is compressed using the standard MP3 format and the other using the lossless format.
Former colleagues from the CEETI, where I was a researcher at the UCLV, were working on high compression ratio encoders/decoders for EEG, audio and EEG signals. They were able to abtain 1/40 compression ratio using vectorial quantization combined with several bit encoding techniques. Of course it was lossy, but at first it was destined to be stored for later observations by humans.