"Dave Plowman (News)" wrote

ISTR it being said the recorder should have the filtering - perhaps
switchable - rather than restricting the tuner audio output? For say mono?


It was a licensing requirement for recorders fitted with Dolby B noise
reduction that they include a 19kHz notch filter and a low-pass filter to
remove the 38kHz sub-carrier and sidebands. Some high-end domestic
recorders, reel-to-reel and cassette, made the notch filter switchable,
though most domestic cassette decks didn't bother.

David.