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.
2.
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.
3.
A "'sound limiter "'or "'noise limiter "'is a digital device fitted with a microphone to measure the sound pressure level of environmental noise, expressed by the decibel logarithmic unit ( dB ).
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