[BC] Old FCC Audio Proof rules

[Thomas G. Osenkowsky]

> Back in the old days didn't we have to do audio response measurments down
to
> 30 Hz.?????

50 to 15,000 cycles for FM and 50 to 7500 cycles for AM.

For AM, response & distortion meausrements at 25%, 50%, 85% and 100%
modulation
Carrier shift (I mean carrier amplitude regulation at 400 cycles) and noise
at 400 cycles referenced to 100% modulation.

For FM, response & distortion meausrements at 25%, 50%, and 100% modulation
except no distortion measurements at 25% and 50% modulation. Noise
at 400 cycles referenced to 100% modulation. Stereo specs upon request.

Tom Osenkowsky, CPBE