Saturday 24 November 2018

NOS vs. Digital Filtering DACs: Exploring filtering turned off, implications, fidelity and subjective audibility. (Recent BorderPatrol DAC chatter...)

Hmmm... Non-OverSampled waveforms - "accurate", "high fidelity"?
The waveforms above were captured with my RME ADI-2 Pro FS ADC at 384kHz. As you can see, on the left side, we see the waveform from the TEAC UD-501 DAC with the digital filter turned off (Non-OverSampling - NOS mode). In the middle, we have the TEAC's "Sharp" oversampling filter engaged. And on the right, we see the same waveforms captured from an old 16-bit Philips TDA1543 x 4 DAC with chips in parallel (supposedly improves noise level), a multi-bit NOS chip, without any oversampling.
Here's the TDA1543 x 4 DAC board. Typically fed with a 12V DC power supply.

Sunday 18 November 2018

MUSINGS: Multidimensional Audio! (An old article... Subjective perceptual ability... And a rigged Atmos / DTS:X setup... :-)

Well folks, it has been a busy last number of weeks around here since I returned from the overseas work trip. No time to play with much audio or tech stuff as a result until earlier this week.

Today I want to just discuss/show a couple of things...

Consider the phrase "multidimensional audio". In today's world, I think if anyone were to use that phrase, one would be thinking about multichannel and surround sound as "multidimensional". Instead, that graphic above is taken from this article - "Multidimensional Audio" (1979) by Henning Møller of B&K.

Sunday 4 November 2018

MUSINGS: Raspberry Pi 3 B+ "Touch" Optimizations; CRAAP Settings, and the "Extremus" Filter Setting.

Okay, let's have some fun with the Raspberry Pi 3 B+ motherboard, piCorePlayer, and my little "Touch" device I recently updated. As discussed before and in the picture shown above, these days, I have the inexpensive JustBoom Digi HAT (~US$40) board attached out the back for simple S/PDIF connectivity as well as USB when I need.

Today, let's hit a few topics related to the Pi 3 B+ setup above. Some little tweaks, things to get it working well, and fooling around with a piCorePlayer/SoX filter you can try for yourself without unnecessary hype nor expense...