Coded data generation or conversion – Digital code to digital code converters – To or from packed format
Patent
1989-03-31
1990-10-16
Shoop, Jr., William M.
Coded data generation or conversion
Digital code to digital code converters
To or from packed format
341 67, 341 87, 3647151, H03M 744
Patent
active
049638670
ABSTRACT:
The data packer receives n-bit wide parallel data words, and it outputs m-bit wide packed parallel data words, where n is a variable and may change during the operation, and m is a fixed integer. The input data words are applied to a bit shifter and therefrom to a data output circuit where they are stored until the necessary m bits are obtained. In the preferred embodiment a control circuit which comprises an adder, receives information indicating the number of valid data bits in each input word, and it provides a running sum of the number of received valid data bits. When the number of bits in an input word is equal to or greater than m, the control circuit provides a first control signal which occurs simultaneously with an m-bit wide packed parallel output word provided by the output circuit. Any number of input bits which is less than m is added to a remainder of a previous sum which is also less than m. When the thusly obtained sum is equal to or greater than m, a second control signal is provided which also occurs simultaneously with an m-bit wide packed word provided by the output circuit. The control circuit applies the running sum as a third control signal to the bit shifter, effecting shift of the next received data word by a number of bit positions corresponding to that sum. The number indicated by the third control signal also corresponds to the number of bits currently stored in the output circuit.
REFERENCES:
patent: 4044347 (1977-08-01), Van Yoorhis
patent: 4189716 (1980-02-01), Krambeck
patent: 4247891 (1981-01-01), Flynn et al.
patent: 4376933 (1983-03-01), Saran et al.
patent: 5593267 (1986-06-01), Kuroda et al.
Ampex Corporation
Shoop Jr. William M.
Strnad Elizabeth E.
Williams H. L.
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