[Eiron]

John Byrns wrote:
In article ,
Patrick Turner wrote:


Gerry wrote:

What the hell is "bodge"????

Andre will have his answer, but when he or someone else uses the term
they mean you have to make the signal from the microphone through to the
speaker via vinyl go through a roller coaster ride of "enfrightenment".

Why can't they just record the mic signal after amplifying with a linear
amp,
cutting record with a linear amplitude amp, and having playback
with a flat amp?


What are a few of the reasons? I assume the main reason the RIAA
recording curve shelves down the high frequency groove amplitude is
because if the high frequencies weren't reduced while cutting the record
the groove velocity, and acceleration, at high frequencies would be too
much for the playback pickup to cope with. Cutting the high frequency
amplitude during recording also would reduce the "pinch" effect. Maybe
an expert can tell us the reasons why the high frequency amplitude is
shelved down when cutting a record following the RIAA recording curve?
The down side is that a "bodge" in the form of a complementary high
frequency amplitude boost must be applied during playback, which
accentuates the high frequency noise.

You have that graph upside down. HF is boosted for disc cutting
and reduced on playback to reduce noise (among other reasons).

Not many people know that preemphasis is also an option for CDs.

--
Eiron.

May contain traces of irony.