Demodulator for an asynchronous binary signal

Details Demodulator for an asynchronous binary signal Demodulator for an asynchronous binary signal

1982-04-02

1984-07-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 43, G11B 509

Patent

active

044620519

ABSTRACT:
To decode a binary signal without regard to the speed at which it is read, each transition in the binary signal is detected, and the time lapse between successive transitions is determined to thereby establish the length of a pulse in the binary signal. The length of one pulse is compared with that of the immediately preceding bit cell to determine whether their lengths are approximately the same or vary by a factor of approximately 2. If the two compared lengths are approximately the same, it is recognized that there is no change in the information conveyed by the signal and therefore the binary state of the most recently detected pulse is representative of the previously established binary state of the signal. However, if the pulse has a duration of approximately one half that of the preceding bit cell, a change in the state of the binary information being conveyed is recognized, and an appropriate indication is provided to signal such change. A multiplexing technique is employed to simultaneously decode a number of signals in this manner.

REFERENCES:
patent: 3959816 (1976-05-01), Spiecers
patent: 4032915 (1977-06-01), Shanks et al.
patent: 4060837 (1977-11-01), Rynearson
patent: 4173026 (1979-10-01), Deming

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