Telecommunications – Receiver or analog modulated signal frequency converter – Squelch
Patent
1986-07-07
1987-08-18
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Squelch
455311, H04B 110
Patent
active
046882650
ABSTRACT:
An FM receiver as used in communciations systems includes a blanking switch for deleting noise pulses and a delay device for delaying the detected pulses so that blanking can occur at the correct time. The circuit receives and detects noise pulses and amplifies them at several gain levels simultaneously. Each amplified pulse which passes a predetermined level causes a trigger signal pulse to be coupled to a ramp generator. The trigger signal pulses are coupled through a combination of flip-flops and voltage controlled switches, and each noise pulse enables a ramp signal of a predetermined maximum but having a rise time which is a function of the detected noise pulse amplitude. The ramp signal length is used to provide blanking switch control signals of an appropriate length to blank out substantially all significant noise pulses.
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Motorola Inc.
Ng Jin F.
Parker Margaret Marsh
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