Sample rate conversion system having interpolation function with

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

1988-09-15

1990-09-04

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341122, 3647241, H03M 700

Patent

active

049548247

ABSTRACT:
A sample rate conversion circuit converts first digital data processed by a first clock signal having a first frequency into digital data processed by a second clock signal having a second frequency. A ring oscillator has a predetermined number of voltage-controlled gate delay elements connected to each other in the form of a loop so as to output polyphase delay clock signals and a predetermined self-excited oscillation signal. A phase-locking circuit applies a control voltage corresponding to a phase difference between the first clock signal and the self-excited oscillation signal to each of the voltage-controlled gate delay elements so as to phase-lock the first clock signal with the self-excited oscillation signal output from the ring oscillator. A latch circuit latches the polyphase delay clock signals output from the ring oscillator in accordance with the second clock signal. An interpolation coefficient generator generates an interpolation coefficient corresponding to phase data between the first and second clock signals in accordance with the polyphase delay clock signals latched by the latch circuit. An interpolating circuit interpolates two adjacent data of the first digital data by using the interpolation coefficient generated by the interpolation coefficient generator and outputting the interpolated data as the second digital data.

REFERENCES:
patent: 4091335 (1978-05-01), Giolma et al.
patent: 4460890 (1984-07-01), Busby
patent: 4513427 (1985-04-01), Borriello et al.
patent: 4612573 (1986-09-01), Grallert et al.
patent: 4797845 (1989-01-01), Stikvoort

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