DISCONTINUOUS MATCHED FILTER Russian patent published in 2007 - IPC H03H17/00 

FIELD: digital communications and signaling, namely, devices for optimal asynchronous signal receipt.

SUBSTANCE: discontinuous matched filter (fig.1) contains clock impulse generator (1), delay line (2), two shift registers (16,17) and weight adder (18). New feature is introduction of integrators with reset (3) and (5), comparators with zero activation threshold (4) and (6), selection-storage devices (7) and (10), square-law generators (8) and (11), low frequency filters (9) and (12), synchronizing trigger (13), channel selection comparator (14), inverter (15) and threshold device (19), activation threshold of which is selected based on Neumann-Pearson criterion, on basis of requirements of false alarm and operation reliability probabilities. Mixture of signal and noise is integrated by integrators (3,5) in lengths, equal to duration of an elementary code symbol. To inputs of weight adder (18), outputs of shift register (16,17) are connected of the channel, phase shift of gating impulse of which is minimal relatively to code series being received.

EFFECT: increased interference resistance to transformation of messages and increased activation sensitivity.

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