"Don Pearce" wrote in message
...

These show an interesting psychological effect. There is almost no top
in the original music, but add a bit of hiss and crackle, and our
brains shape it into the missing sibilants (or whatever), despite the
fact that it is there continuously.

How true. Some people comment on the apparent loss of hf on the
restored version. In actual fact the frequency response of the recording
systems in those days was approx 100Hz to 5kHz (five and a half octaves)
so there never was any real hf to speak of.

It is interesting too how the internal balance of the recording seems to
improve when the noise artifacts are removed. In this case the rhythm
guitar.

Iain