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Many can hear beyond 20KHz.

Hi.

Let's look at a fundamental pitch, say A1 (55Hz) of a modern piano, its first 20 partials of its harmonic series goes up to 660Hz.

Plus our brain tends to fuse harmonically-related frequency components into a single sensation called 'pitch'. With all these high orders of harmonics & pitch intregrated to form the timbre of a particular instrument which we can perceive.

So can we detect any things beyond 20KHz? Yes, according to a paper presented in an Auido Engineering Society convention:
"Detection threshold for tones above 22KHz".

It was a report on an aural experience in audio signals with & withOUT ultrasonic addition. The difference was easily perceivable.

The importance of utrasonic perception was already put into commercial marketing back in 1960s. Harmon Kardon first came up with its audio amps claimed to respond up to 40KHz.

Many don't like the sound of CD media: 'cold, non-musical". Why? Blame the hi-pass filter which removes anything beyond 22KHz per CD specs.

With DVD-audio or SACD, having frequency reponse extended to 96KHZ & the hi-pass filter shifted up to 50KHz, we start to like
digital sound again. Obviously the ultrasonic harmonics, which contribute the spartial sensation of the music are retained.

IMO, DVD-audio with its 24-bit 196KHz DAC blows CD sound away, & is
a real competition of the finest analogue media.

c-J

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