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However, a bit noise floor is already below what we can hear. Some people are exceptionally well trained to hear nuances in sound and music most people don't even know exist. Take the remote into the basement, or the darkest room in your house, in the middle of the night, with the lights off. It only increases the dynamic range, the range between the softest possible and the loudest possible sound, by lowering the noise floor. Why would any company spend money to fix what it's completely unaware is broken?
Because it's a solution to a problem that doesn't exist, a business model based on willful ignorance and scamming people. Interestingly, the threshold of pain decreases with age rather than increasing.
Controlled experimentation shows that awareness of confirmation bias can increase rather than decreases the effect! If there are audible differences I'm sure it's just because of remastering. Let's say you expected to hear a large difference but were shocked to hear a small difference. Science is science, no slacking.
Like the ear, the eye has sensory cells rods and cones that detect light in different but overlapping frequency bands. No one can see X-rays or infrared, or ultraviolet, or microwaves.
Surf Monkey and HiFi like this. What if there was actually no difference at all?
However it's been discussed widely in articles and on forums, with the authors joining in. Intermodulation distortion from ultrasonics is a possibility, not a certainty, in any given system for a given set of material. Undiscovered mistakes in test methodologies and equipment nearly always produce false positive results by accidentally introducing audible differences rather than false negatives.
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These sensory organs respond to light in overlapping spectral bands, just as the ear's hair cells are tuned to respond to overlapping bands of sound frequencies. Equipment vendors increasingly researched and marketed new technology to allow hotter and hotter masters. Advanced vinyl mastering equipment in the s and s, for example, tracked and nested groove envelopes when possible in order to allow higher amplitudes than the groove spacing would normally permit.
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Several were kind enough to let me know which remotes these were, and I was able to test several on a spectrometer. There is an upper and lower audible frequency limit, past which the sensitivity of the last hair cells drops to zero, vplayer trial and hearing ends. Further reading Readers have alerted me to a pair of excellent papers of which I wasn't aware before beginning my own article. Approximate locations of several frequencies are marked.
Let your eyes adjust to the blackness. They don't even need to be expensive, though expensive headphones can be worth the money.
The ultrasonics are a liability during playback. But what of badly encoded files? The membrane is tuned to resonate at different frequencies along its length, with higher frequencies near the base and lower frequencies at the apex. They're equivalent, as frequency is just the inverse of wavelength.
Inaudible ultrasonics contribute to intermodulation distortion in the audible range light blue area. They propose that video represent not only the visible spectrum, but also infrared and ultraviolet. It is inefficient, using more channels than competing systems.
Plenty of these old, bad encoders are still in use, presumably because the licenses are cheaper and most people can't tell or don't care about the difference anyway. The test was constructed to maximize the possibility of detection by placing the intermodulation products where they'd be most audible. This gives us a curve representing the very quietest sound the human ear can perceive for any given frequency as measured in ideal circumstances on healthy ears.
These are hardly impossible technical hurdles. Perception falls off steeply at the edges. In single-blind testing, a listener knows nothing in advance about the test choices, and receives no feedback during the course of the test.
Clipping is another easy mistake, sometimes obvious only in retrospect. It's not clear what if any are used in practice, as the workings of most professional consoles are trade secrets. The ear hears via hair cells that sit on the resonant basilar membrane in the cochlea. We can represent and encode excellent and robust localization with systems like Ambisonics. At low frequencies, the cochlea works like a bass reflex cabinet.
Nor can a bias be defeated by mere skepticism. Anecdotes do not replace data, but this story is instructive of the ease with which undiscovered flaws can bias listening tests. Genetic gifts and golden ears Based on my correspondences, many people believe in individuals with extraordinary gifts of hearing. Binaural audio is similarly difficult.
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