Patent
1975-07-29
1977-01-11
Heyman, John S.
328 48, 328140, 328167, H03K 906, H03D 304
Patent
active
040029891
ABSTRACT:
A novel circuit combination comprised of small scale integrated (SSI) and medium scale integrated (MSI) integrated circuits (IC) for the filtering and passing of a selected low band of passable frequencies and of a selected amplitude is disclosed. The novel circuit combination is a special-purpose low pass digital filter of a programmable high frequency limit that is determined by the sample time T.sub.S duration and the programmable high F.sub.H frequency of the passable analog signal frequency having a nominal carrier signal frequency F.sub.A. The analog signal is initially tested for a minimal amplitude and converted to a binary digital signal. The pulses of the binary digital signal are counted over the sample time T.sub.S. If the number of pulses N.sub.A counted, i.e., the analog signal frequency F.sub.A where F.sub.A = (N.sub.A /T.sub.S), similarly, any frequency F.sub.X = (N.sub.X /T.sub.S), over the sample time T.sub.S is within the passable low band, i.e., passable (F.sub.A <F.sub.H), a first binary signal is generated. Alternatively, if the number of pulses N.sub.A counted over the sample time T.sub.S is without the passable low band, i.e., not passable (F.sub.A .gtoreq.F.sub.H), the first binary signal is not generated. The first binary signal is ANDed with the binary digital signal for gating out the binary digital signal to user equipment, while, alternatively, the absence of the first binary signal inhibits the gating of the binary digital signal to user equipment. Sample times continue throughout the detection-comparing operation to ensure a continuous filtering process.
REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3636270 (1972-01-01), McIntosh et al.
patent: 3737789 (1973-06-01), McCoy et al.
patent: 3757233 (1973-09-01), Dixon
patent: 3761809 (1973-09-01), Lockitt et al.
patent: 3845399 (1974-10-01), Cardon et al.
Cardon Carlos D.
Griffone Lawrence P.
Grace Kenneth T.
Heyman John S.
Nikolai Thomas J.
Sperry Rand Corporation
Truex Marshall M.
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