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The Subliminal Impact of Sound - Adreas Koch


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I thought this bit was rather disingenuous.

 

 

Once you're up to 4x PCM you've got a lot of freedom in your choice of filters. You don't need a sharp cliff. At 192 kHz, the stopband has to be 96 kHz or lower; for audio fidelity you need a passband of at least 18 kHz; if you can't get ringing down to acceptably low levels with a transition band of up to 78 kHz, then you are not working very hard at it.

 

FWIW, I understand that some time ago PCM booster and at least occasional DSD basher, Charles Hansen of Ayre, stated that PCM is an inherently superior format to DSD. However, he then added that the only reason DSD sounds better is because of superior filtering.

"Relax, it's only hi-fi. There's never been a hi-fi emergency." - Roy Hall

"Not everything that can be counted counts, and not everything that counts can be counted." - William Bruce Cameron

 

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DSD not required

 

https://en.wikipedia.org/wiki/Infrasound

 

On 31 May 2003, a group of UK researchers held a mass experiment where they exposed some 700 people to music laced with soft 17 Hz sine waves played at a level described as "near the edge of hearing", produced by an extra-long-stroke subwoofer mounted two-thirds of the way from the end of a seven-meter-long plastic sewer pipe. The experimental concert (entitled Infrasonic) took place in the Purcell Room over the course of two performances, each consisting of four musical pieces. Two of the pieces in each concert had 17 Hz tones played underneath.[38][39]

In the second concert, the pieces that were to carry a 17 Hz undertone were swapped so that test results would not focus on any specific musical piece. The participants were not told which pieces included the low-level 17 Hz near-infrasonic tone. The presence of the tone resulted in a significant number (22%) of respondents reporting anxiety, uneasiness, extreme sorrow, nervous feelings of revulsion or fear, chills down the spine, and feelings of pressure on the chest.[40][41]

In presenting the evidence to the British Association for the Advancement of Science, Professor Richard Wiseman said, "These results suggest that low frequency sound can cause people to have unusual experiences even though they cannot consciously detect infrasound. Some scientists have suggested that this level of sound may be present at some allegedly haunted sites and so cause people to have odd sensations that they attribute to a ghost—our findings support these ideas."

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