Sample rate conversion system having interpolation function

Details Sample rate conversion system having interpolation function Sample rate conversion system having interpolation function

1987-09-29

1989-09-26

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

358 13, H04N 980, H04B 166

Patent

active

048706612

ABSTRACT:
A first digital data processing system outputs digital data obtained by sampling, in response to a clock signal of a first frequency, original data having a characteristic enabling interpolation thereof. A second digital data processing system obtaines output data by sampling input data in response to a clock signal of a second frequency. A sample rate conversion circuit receives the digital data from the first digital data processing system, converts the sample rate thereof into a sample rate suitable for the second digital data processing system, and supplies the sample rate as the input data to the second digital data processing system. The sample rate conversion circuit includes an interpolation circuit for performing interpolation of two adjacent units of data of the digital data received from the first digital data processing system, and an interpolation coefficient calculation circuit for calculating an interpolation coefficient, which is subsequently supplied to the interpolation circuit in accordance with a phase relationship between the clock signals of the first and second frequencies.

REFERENCES:
patent: 4302776 (1981-11-01), Taylor et al.
patent: 4438452 (1984-03-01), Powers
patent: 4471381 (1984-09-01), Kasuga et al.
patent: 4609941 (1986-09-01), Carr et al.
patent: 4636857 (1987-01-01), Achiha et al.
patent: 4677483 (1987-06-01), Dischert et al.

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