Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-07-23
1977-06-28
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
360 44, H04L 300
Patent
active
040329151
ABSTRACT:
This disclosure describes a decoding system for decoding and formatting digital data recorded on magnetic tape in the STR ("speed-tolerant recording") format. The digital words are stored in cells of about equal width except that the leading cell of each word, called a "sync" cell, is of double width. Each cell starts with a positive pulse, and a cell detector provides a signal each time this occurs. The apparatus includes a data detector, which analyzes the width of this positive pulse relative to the cell width to determine whether the cell is a 1 bit or a 0 bit. Since the measurement is relative, cell length, i.e., total cell time, is not important. The bit determination is loaded into a shift register. Other apparatus determines the width of the cell, so that a sync cell detector can determine whether a sync cell is present or not. When a sync cell is detected, a pulse is generated which actuates the output buffer register to load the bits from the shift register. Data flows from buffer to a computer.
REFERENCES:
patent: 2870429 (1959-01-01), Hales
patent: 3416133 (1968-12-01), Hunkins
patent: 3508228 (1970-04-01), Bishop
patent: 3720927 (1973-03-01), Wolf
patent: 3760412 (1973-09-01), Barnes
patent: 3823397 (1974-07-01), Howard
patent: 3887769 (1975-06-01), Cichetti
Read Randol R.
Shanks John L.
Supernaw John W.
McIlroy Arthur
Metrailer Albert C.
Miller Charles D.
Standard Oil Company (Indiana)
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