NE650 circuit equivalent, dolby b-type noise reduction circuit.
excellent dynamic characteristics over a wide range of operating conditions and is pin-compatible with NE645/646. This circuit is available only to licensees of Dolby Lab.
The NE650 is a monolithic audio noise reduction circuit designed for use in Dolby™B-Type noise reduction systems. The NE650 is used to reduce the level of background noise introduced during recording and playback of audio signals on magnetic tape.
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