US5539403A — D/A conversion apparatus and A/D conversion appar…

Claim 1

Independent Claim 148 words

A D/A conversion apparatus for converting a digital input signal to an analog output signal the apparatus comprising: a digital filter having as an input said digital input signal, the digital filter for multiplying a sampling frequency of said digital input signal by k (k≧2), a noise shaper having as an input an output of said digital filter, the noise shaper for changing a frequency characteristic of noise to a predetermined characteristic with a word limitation, a decoder having as an input an output of said noise shaper, for converting the noise shaper output to a 1-bit signal array, a 1-bit D/A converter array comprised of a plurality of 1-bit D/A converters for converting the 1-bit signal array output of said decoder to corresponding analog signal outputs, and an analog adder for totalizing the outputs of said 1-bit D/A converter array and generating said analog output signal therefrom.

Claim 2

Dependent Claim 148 words

A D/A conversion apparatus for converting a digital input signal to an analog output signal the apparatus comprising: a digital filter having as an input said digital input signal, the digital filter for multiplying a sampling frequency of said digital input signal by k (k≧2), a noise shaper having as an input an output of said digital filter, the noise shaper for changing a frequency characteristic of noise to a predetermined characteristic with a word limitation, a decoder having as an input an output of said noise shaper, for converting the noise shaper output to a 1-bit signal array, a 1-bit D/A converter array comprised of a plurality of 1-bit D/A converters for converting the 1-bit signal array output of said decoder to corresponding analog signal outputs, and an analog adder for totalizing the outputs of said 1-bit D/A converter array and generating said analog output signal therefrom.

Claim 3

Dependent Claim 123 words

A D/A conversion apparatus comprising: a digital filter for multiplying a sampling frequency of an inputted digital signal by k (k≧2), a multi-stage quantizing type noise shaper to which an output of said digital filter is inputted for changing a frequency characteristic of noise to a predetermined characteristic with a word length limitation, a plurality of decoders to which outputs of respective stages of said noise shaper are inputted for converting each of the noise shaper outputs to a 1-bit signal array, a 1-bit D/A converter array comprised of a plurality of 1-bit D/A converters for converting respective outputs of said plurality of decoders to analog signals, and an analog adder for totalizing the analog output signals of said 1-bit D/A converter array.

Claim 4

Dependent Claim 123 words

A D/A conversion apparatus comprising: a digital filter for multiplying a sampling frequency of an inputted digital signal by k (k≧2), a multi-stage quantizing type noise shaper to which an output of said digital filter is inputted for changing a frequency characteristic of noise to a predetermined characteristic with a word length limitation, a plurality of decoders to which outputs of respective stages of said noise shaper are inputted for converting each of the noise shaper outputs to a 1-bit signal array, a 1-bit D/A converter array comprised of a plurality of 1-bit D/A converters for converting respective outputs of said plurality of decoders to analog signals, and an analog adder for totalizing the analog output signals of said 1-bit D/A converter array.

Claim 5

Dependent Claim 186 words

An A/D conversion apparatus for converting an analog input signal to a digital output signal, the apparatus comprising: a subtracter having a subtraction terminal and an addition terminal, to which two analog signals are inputted, respectively and from which an analog output representing a difference of both analog signals is output, an integrator for integrating the analog output of said subtracter, a quantizer for converting an output of said integrator to a digital signal, a decoder for converting the digital signal output from said quantizer to a 1-bit signal array of outputs corresponding to a value of said digital signal, a 1-bit D/A converter array comprising a plurality of 1-bit D/A converters for converting the outputs of said decoder to respective output analog signals, and an analog adder for totalizing the outputs of said 1-bit D/A converter array, wherein an output of said analog adder comprises the analog signal input to the subtraction terminal of said subtracter, the analog input signal comprises the analog signal input to the addition terminal of said subtracter, and the digital output signal comprises said digital signal output of said quantizer.

Claim 6

Dependent Claim 186 words

An A/D conversion apparatus for converting an analog input signal to a digital output signal, the apparatus comprising: a subtracter having a subtraction terminal and an addition terminal, to which two analog signals are inputted, respectively and from which an analog output representing a difference of both analog signals is output, an integrator for integrating the analog output of said subtracter, a quantizer for converting an output of said integrator to a digital signal, a decoder for converting the digital signal output from said quantizer to a 1-bit signal array of outputs corresponding to a value of said digital signal, a 1-bit D/A converter array comprising a plurality of 1-bit D/A converters for converting the outputs of said decoder to respective output analog signals, and an analog adder for totalizing the outputs of said 1-bit D/A converter array, wherein an output of said analog adder comprises the analog signal input to the subtraction terminal of said subtracter, the analog input signal comprises the analog signal input to the addition terminal of said subtracter, and the digital output signal comprises said digital signal output of said quantizer.

Claim 7

Dependent Claim 213 words

An A/D conversion apparatus for converting an analog input to a digital output, comprising: a first subtracter having an addition terminal and a subtraction terminal to which two analog signals are inputted and from which an analog output representing a difference of both analog signals is output, a first integrator for integrating the analog output of said first subtracter and generating an analog output therefrom, a second subtracter having an addition terminal and a subtraction terminal, wherein the analog output of said first integrator is inputted to the addition terminal, the second subtracter generating an analog output, a second integrator for integrating the analog output of said second subtracter, a quantizer for converting an output of said second integrator to a digital signal, a decoder for converting the digital signal output of said quantizer to a 1-bit signal array, a 1-bit D/A converter array comprising a plurality of 1-bit D/A converters for converting the outputs of said decoder to respective analog signals, and an analog adder for totalizing the outputs of said 1-bit D/A converter array and outputting a signal to the subtraction terminals of said first and second subtracters, wherein the analog input is inputted to the addition terminal of said first subtracter, and the digital output is output from said quantizer.

Claim 8

Dependent Claim 213 words

An A/D conversion apparatus for converting an analog input to a digital output, comprising: a first subtracter having an addition terminal and a subtraction terminal to which two analog signals are inputted and from which an analog output representing a difference of both analog signals is output, a first integrator for integrating the analog output of said first subtracter and generating an analog output therefrom, a second subtracter having an addition terminal and a subtraction terminal, wherein the analog output of said first integrator is inputted to the addition terminal, the second subtracter generating an analog output, a second integrator for integrating the analog output of said second subtracter, a quantizer for converting an output of said second integrator to a digital signal, a decoder for converting the digital signal output of said quantizer to a 1-bit signal array, a 1-bit D/A converter array comprising a plurality of 1-bit D/A converters for converting the outputs of said decoder to respective analog signals, and an analog adder for totalizing the outputs of said 1-bit D/A converter array and outputting a signal to the subtraction terminals of said first and second subtracters, wherein the analog input is inputted to the addition terminal of said first subtracter, and the digital output is output from said quantizer.

Claim 9

Dependent Claim 84 words

The D/A conversion apparatus of claim 1, wherein the 1-bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the noise shaper output signal having a value of P where P is an integer, and the 1-bit signal array is allotted by circulating in a manner that a starting position of allotment of said 1-bit signal array becomes a next position of a final allotment position of said 1-bit signal array of a previous sample data.

Claim 10

Dependent Claim 62 words

The D/A conversion apparatus of claim 1, wherein the 1-bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the noise shaper output signal having the value of p, where p is an integer and a starting point of allotment of said 1-bit signal array circulates by a predetermined number every 1 sample data.

Claim 11

Dependent Claim 53 words

The D/A conversion apparatus of claim 5, wherein the plurality of 1-bit D/A converters corresponding to the 1-bit signal array of said decoder output are arranged such that polarity of an error with an average output level of said 1-bit D/A converter is opposed and an absolute value of said error is closed.

Claim 12

Dependent Claim 90 words

The D/A conversion apparatus of claim 5, wherein the plurality of 1-bit D/A converters comprises m D/A converters, m being an integer, and when each 1-bit D/A converter of m in said 1-bit D/A converter array is made to DAC-1, DAC-2, DAC-3, DAC-4, . . . , DAC-(m-3), DAC-(m-2), DAC-(m-1), DAC-m in the order of the output level, the 1-bit D/A converter is allotted in arrangement of DAC-1, DAC-(m-1), DAC-3, DAC-(m-3), . . . , DAC-4, DAC-(m-2), DAC-2, DAC-m with respect to the 1-bit signal array output from said decoder.

Claim 13

Dependent Claim 44 words

The D/A conversion apparatus of claim 5, wherein the plurality of 1-bit D/A converters are accorded to respective group, each group corresponding to a respective decoder and each group is allotted in the order of the output level of said 1-bit D/A converter array.

Claim 14

Dependent Claim 119 words

The D/A conversion apparatus of claim 2, wherein the multi-stage noise shaper comprises a two stage configuration, the plurality of decoders comprises a first decoder and a second decoder to which the outputs of said noise shaper are inputted, respectively, and the plurality of D/A converters are grouped into a first group and a second group, respectively, wherein the groups corresponding to each output of said decoders allot in the order of an output level of the 1-bit D/A converter in said 1-bit D/A converter array, the first group of 1-bit D/A converters is arranged in inverse order of the output level, and the second group of 1-bit D/A converters is arranged in the order of the output level.

Claim 15

Dependent Claim 49 words

The D/A conversion apparatus of claim 5, wherein each 1-bit D/A converter in said 1-bit D/A converter array is allotted in an order such that the output of said decoder is near to the center with respect to the order of the output level of said 1-bit D/A converter.

Claim 16

Dependent Claim 130 words

The D/A conversion apparatus of claim 2, wherein the multi-stage noise shaper comprises a two stage configuration, the plurality of decoders comprises a first decoder and a second decoder to which the outputs of said noise shaper are inputted, respectively, and the plurality of D/A converters are grouped into a first group and a second group, respectively, wherein the groups are made to allot both end parts to the first group with respect to the order of the output level of the 1-bit D/A converter in said 1-bit D/A converter array, and to allot a central part of a remainder to the second group, and said first group is arranged in the order of the output level, and said second group is arranged in inverse order of the output level.

Claim 17

Dependent Claim 84 words

The D/A conversion apparatus of claim 2, wherein the 1-bit signal array output of said decoders comprises at least a 1-bit signal array of (p-1) corresponding to the noise shaper output signals having a value of P where P is an integer, and the 1-bit signal array is allotted by circulating in a manner that a starting position of allotment of said 1-bit signal array becomes a next position of a final allotment position of said 1-bit signal array of a previous sample data.

Claim 18

Dependent Claim 53 words

The D/A conversion apparatus of claim 13, wherein the plurality of 1-bit D/A converters corresponding to the 1-bit signal array output of said decoders are arranged such that polarity of an error with an average output level of said 1-bit D/A converters is opposed and an absolute value of said error is closed.

Claim 19

Dependent Claim 90 words

The D/A conversion apparatus of claim 13, wherein the plurality of 1-bit D/A converters comprises m D/A converters, m being an integer, and when each 1-bit D/A converter of m in said 1-bit D/A converter array is made to DAC-1, DAC-2, DAC-3, DAC-4, . . . , DAC-(m-3), DAC-(m-2), DAC-(m-1), DAC-m in the order of the output level, the 1-bit D/A converter is allotted in arrangement of DAC-1, DAC-(m-1), DAC-3, DAC-(m-3), . . . , DAC-4, DAC-(m-2), DAC-2, DAC-m with respect to the 1-bit signal array output from said decoders.

Claim 20

Dependent Claim 44 words

The D/A conversion apparatus of claim 13, wherein the plurality of 1-bit D/A converters are accorded to respective groups, each group corresponding to a respective decoder and each group is allotted in the order of the output level of said 1-bit D/A converter array.

Claim 21

Dependent Claim 49 words

The D/A conversion apparatus of claim 13, wherein each 1-bit D/A converter in said 1-bit D/A converter array is allotted in an order such that the output of said decoders is near to the center with respect to the order of the output level of said 1-bit D/A converter.

Claim 22

Dependent Claim 64 words

The D/A conversion apparatus of claim 2, wherein the 1-bit signal array output of said decoders comprises at least a 1-bit signal array of (p-1) corresponding to the output signals of the noise shapers having the value of p, where p is an integer, and a starting point of allotment of said 1-bit signal array circulates by a predetermined number every 1 sample data.

Claim 23

Dependent Claim 86 words

The A/D conversion apparatus of claim 3, wherein the 1-bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the digital signal output of said quantizer having a value of P, where P is an integer, and the 1-bit signal array is allotted by circulating in a manner that a starting position of allotment of said 1-bit signal array becomes a next position of a final allotment position of said 1-bit signal array of a previous sample data.

Claim 24

Dependent Claim 53 words

The A/D conversion apparatus of claim 19, wherein the plurality of 1-bit D/A converters corresponding to the 1-bit signal array of said decoder output are arranged such that polarity of an error with an average output level of said 1-bit D/A converter is opposed and an absolute value of said error is closed.

Claim 25

Dependent Claim 87 words

The A/D conversion apparatus of claim 19, wherein the plurality of 1-bit D/A converters comprises m D/A converters, m being an integer, and when each 1-bit D/A converter of m in said 1-bit D/A converter array is made to DAC-1, DAC-2, DAC-3, DAC-4, . . . , DAC-(m-3), DAC-(m-2), DAC-(m-1), DAC-m in the order of the output level, the 1-bit D/A converter is allotted in arrangement of DAC-1, DAC-(m-1), DAC-3, DAC-(m-3), ..., DAC-4, DAC-(m-2), DAC-2, DAC-m with respect to the 1-bit signal array output from said decoder.

Claim 26

Dependent Claim 37 words

The A/D conversion apparatus of claim 19, wherein the plurality of 1-bit D/A converters are accorded to respective groups and each group is allotted in the order of the output level of said 1-bit D/A converter array.

Claim 27

Dependent Claim 49 words

The A/D conversion apparatus of claim 19, wherein each 1-bit D/A converter in said 1-bit D/A converter array is allotted in an order such that the output of said decoder is near to the center with respect to the order of the output level of said 1-bit D/A converter.

Claim 28

Dependent Claim 61 words

The A/D conversion apparatus of claim 3, wherein the 1-bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the quantizer output signal having the value of p, where p is an integer, and a starting point of allotment of said 1-bit signal array circulates by a predetermined number every 1 sample data.

Claim 29

Dependent Claim 86 words

The A/D conversion apparatus of claim 4, wherein the 1-bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the digital signal output of said quantizer having a value of P, where P is an integer, and the 1-bit signal array is allotted by circulating in a manner that a starting position of allotment of said 1-bit signal array becomes a next position of a final allotment position of said 1-bit signal array of a previous sample data.

Claim 30

Dependent Claim 53 words

The A/D conversion apparatus of claim 25, wherein the plurality of 1-bit D/A converters corresponding to the 1-bit signal array of said decoder output are arranged such that polarity of an error with an average output level of said 1-bit D/A converter is opposed and an absolute value of said error is closed.

Claim 31

Dependent Claim 90 words

The A/D conversion apparatus of claim 25, wherein the plurality of 1-bit D/A converters comprises m D/A converters, m being an integer, and when each 1-bit D/A converter of m in said 1-bit D/A converter array is made to DAC-1, DAC-2, DAC-3, DAC-4, . . . , DAC-(m-3), DAC-(m-2), DAC-(m-1), DAC-m in the order of the output level, the 1-bit D/A converter is allotted in arrangement of DAC-1, DAC-(m-1), DAC-3, DAC-(m-3), . . . , DAC-4, DAC-(m-2), DAC-2, DAC-m with respect to the 1-bit signal array output from said decoder.

Claim 32

Dependent Claim 38 words

The A/D conversion apparatus of claim 25, wherein the plurality of 1-bit D/A converters are accorded to respective groups and each group is allotted in the order of the output level of said 1 bit D/A converter array.

Claim 33

Dependent Claim 49 words

The A/D conversion apparatus of claim 25, wherein each 1-bit D/A converter in said 1-bit D/A converter array is allotted in an order such that the output of said decoder is near to the center with respect to the order of the output level of said 1-bit D/A converter.

Claim 34

Dependent Claim 61 words

The A/D conversion apparatus of claim 4, wherein the bit signal array output of said decoder comprises at least a 1-bit signal array of (p-1) corresponding to the quantizer output signal having the value of p, where p is an integer, and a starting point of allotment of said 1-bit signal array circulates by a predetermined number every 1 sample data.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-07-23	2000-01-22	2000-07-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-07-23	2004-01-22	2004-07-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-07-23	2008-01-22	2008-07-23	$7700.00	Window Closed / Lapsed

D/A conversion apparatus and A/D conversion apparatus

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag