US 6,476,750 B1 · Over-sampling A/D, D/A converter

Abstract

The hardware of an over-sampling A/D and D/A converter is provided, which hardware is capable of being operated with either kind of software: one corresponding to a first method in which the over-sampling ratio is fixed and the other corresponding to a second method in which the over-sampling ratio is variable. The value N3 written on the pseudo-frequency-dividing-ratio-register 11 and the value N4 written on the pseudo-over-sampling-ratio-register 21 are converted through a user interface into the frequency dividing ratio N1 by the conversion circuit 12 and the converted result is written in the frequency-dividing-ratio-register 10.

Claims22

Dependent claims

A conversion apparatus comprising:

an over-sampling-ratio-register and a frequency-dividing-ratio-register capable of being set by a signal from an external circuit,
wherein a new frequency dividing ratio is generated based on the set values in said frequency-dividing-ratio-register and said over-sampling-ratio-register, and an original oscillation frequency is divided based on said generated frequency dividing ratio to form a sampling frequency.

A conversion apparatus comprising:

a pseudo-frequency-dividing-ratio-register;
a pseudo-over-sampling-ratio-register;
a frequency-dividing-ratio-register;
and
a conversion circuit for converting the values set in said pseudo-frequency-dividing-ratio-register and said pseudo-over-sampling-ratio-register to generate a set value of said frequency-dividing-ratio-register;
wherein an original oscillation frequency is divided based on the set value of said frequency-dividing-ratio register to form a sampling frequency.

3 more elements

An over-sampling digital/analog conversion apparatus comprising:

a pseudo-frequency-dividing-ratio-register;
a pseudo-over-sampling-ratio-register;
and
a frequency-dividing-ratio-register;
wherein the values set in said pseudo-frequency-dividing-ratio-register and said pseudo-over-sampling-ratio-register are converted to generate a set value of said frequency-dividing-ratio-register, and
an original oscillation frequency is divided based on the set value of said frequency-dividing-ratio-resister to form a sampling frequency.

3 more elements

A conversion apparatus comprising:

a pseudo-frequency-dividing-ratio-register;
an over-sampling-ratio-register;
and
a conversion circuit for converting set values of said frequency-dividing-ratio-register and said pseudo-frequency-dividing-ratio-register to generate set values of said frequency-dividing-ratio-register and said over-sampling-ratio-register;
wherein an original oscillation frequency is divided to form a sampling frequency, and
a decimator is operated based on the set value of said over-sampling-ratio-register.

3 more elements

An over-sampling digital/analog conversion apparatus comprising:

a pseudo-frequency-dividing-ratio-register;
an over-sampling-ratio-register;
and
a conversion circuit for converting set values of the frequency-dividing-ratio-register and the pseudo-frequency-dividing-ratio-register to generate set values of said frequency-dividing-ratio-register and said over-sampling-ratio-register;
wherein an original oscillation frequency is divided based on a set value of said frequency-dividing-ratio-register to form a sampling frequency, and
an interpolator is operated based on the set values of said over-sampling-ratio-register.

3 more elements

Dependencies are inferred from the claim text.

Over-sampling A/D, D/A converter

Life of this patent

Over-sampling A/D, D/A converter

Life of this patent

Abstract

Claims22