noise limiter

The receiver featured 13 vacuum tubes plus solid state rectifiers and a noise limiter.

Automatic noise limiter or noise blanker: Reduces background noise (such as spark ignition)

Automatic Noise Limiter, in telecommunications, a feature that automatically reduces noise and improves reception in a radio receiver.

It was a development of the patent Philips Dynamic Noise Limiter (DNL) system, introduced in 1971, with the circuitry on a single semiconductor.

Dynamic Noise Limiter (DNL) is an unpatented audio noise reduction system originally introduced by Philips in 1971 for use on cassette decks.

Whilst this type of receiver is adequate for reception of local beacons, specialized techniques (receiver preselectors, noise limiters and filters) are required for the reception of very weak signals from remote beacons.

Philips developed an alternative noise reduction system known as Dynamic Noise Limiter (DNL) which did not require the tapes to be processed during recording; this was also the basis of the later DNR noise reduction.