Title: Programmable data envelope detector

Abstract: A programmable data envelope detector indicates the presence of phase encoded data being transmitted to or received from a data storage medium. The detector generates an output signal at a predetermined time after detecting the presence of data and continues to provide such output signal for a predetermined time after detecting the end of data. The detector comprises a data pulse detector, three-count up-down counter, two multicount four-bit up-down counters, a microprogrammable control store and decoder, a compare circuit, and a latch circuit. The time periods at which the latch circuit generates the output signal are different depending upon the nature of the data transfer operation, such time periods corresponding to different microinstructions in the control store.

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Inventors: Besenfelder, Edward Roald (Phoenix, AZ, US)
Cantrell, Steve Garner (Glendale, AZ, US)

Application Number: 727309
Filing Date: 1976-09-27
Publication_date: 1977-10-11
Assignee: Honeywell Information Systems Inc. (Phoenix, AZ)
Primary Class(es): 377/55 360/40, 377/20, 377/39
Other Classes:
US Patent Ref:

3581066	May, 1971	Maure et al.	235/92.
3714645	Jan, 1973	Sivertson	235/92.
3824378	Jul, 1974	Johnson et al.	235/92.
3956616	May, 1976	Knollenberg	235/92.
3981440	Sep, 1976	Richardson	235/92.

Other Refs:
Primary Examiner: Thesz, Joseph M.
Assistant Examiner:
Attorney: Nielsen; Walter A., Holloway, Jr.; William W.