Method of increasing the signal-to-noise ratio of a time-depende

Details Method of increasing the signal-to-noise ratio of a time-depende Method of increasing the signal-to-noise ratio of a time-depende

1975-10-14

1976-12-14

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

178 68, 178DIG12, 235181, C06G 712

Patent

active

039977749

ABSTRACT:
A method of increasing the signal-to-noise ratio of a time-dependent scanning signal produced during a periodic scanning operation wherein a defined or bounded and centered field is scanned line-by-line by means of a scanning device, there is produced a time-dependent supplementary or additional signal corresponding to the spacing of the momentarily scanned location from the center of the field and possessing a momentary value r as well as a maximum value R. Successive line scans occur in directions which in each instance differ from one another by a predetermined angle in such a manner that as a function of the line width the neighboring lines successively adjoin one another at the field boundary and within the field partially overlap and at the field center completely overlap. From the scanning signal there is produced a multiplicity of primary signals forming a sequence, which in this sequence possess a stepwise time-delay which in each case increases by a period of the line scanning. From the supplementary signal there is produced a multiplicity of auxiliary signals, a respective auxiliary signal is multiplied in a respective multiplier with a respective associated primary signal for producing a respective intermediate signal, and the intermediate signals are summated in an adder for producing an output signal.

REFERENCES:
patent: 3428794 (1969-02-01), Norsworthy
patent: 3700876 (1972-10-01), Gray
patent: 3732410 (1973-05-01), Mackechnie
patent: 3736414 (1973-05-01), McAuliffe
patent: 3792245 (1974-02-01), Hocker et al.

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