GB1444216A - D/a converter for pcm - Google Patents

D/a converter for pcm

Info

Publication number
GB1444216A
GB1444216A GB715775A GB715775A GB1444216A GB 1444216 A GB1444216 A GB 1444216A GB 715775 A GB715775 A GB 715775A GB 715775 A GB715775 A GB 715775A GB 1444216 A GB1444216 A GB 1444216A
Authority
GB
United Kingdom
Prior art keywords
interpolator
significant bits
signal
filter
bits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB715775A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB715775A priority Critical patent/GB1444216A/en
Priority to IN2355/CAL/75A priority patent/IN143625B/en
Priority to SU762309106A priority patent/SU1132805A3/en
Priority to AR262202A priority patent/AR212019A1/en
Priority to NO760428A priority patent/NO143776C/en
Priority to NL7601414A priority patent/NL7601414A/en
Priority to AU11100/76A priority patent/AU497002B2/en
Priority to DE2605724A priority patent/DE2605724C2/en
Priority to SE7601666A priority patent/SE410929B/en
Priority to IT20224/76A priority patent/IT1054867B/en
Priority to BR7601013A priority patent/BR7601013A/en
Priority to BE2054833A priority patent/BE838666A/en
Priority to DK64976A priority patent/DK148866C/en
Priority to CH201976A priority patent/CH607456A5/xx
Priority to CA246,085A priority patent/CA1093697A/en
Priority to ES445387A priority patent/ES445387A1/en
Priority to AT0121476A priority patent/AT377397B/en
Priority to FR7604733A priority patent/FR2301971A1/en
Priority to JP51017156A priority patent/JPS51135354A/en
Publication of GB1444216A publication Critical patent/GB1444216A/en
Priority to US05/796,919 priority patent/US4109110A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers
    • G06F7/68—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers using pulse rate multipliers or dividers pulse rate multipliers or dividers per se
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/50—Digital/analogue converters using delta-sigma modulation as an intermediate step
    • H03M3/502—Details of the final digital/analogue conversion following the digital delta-sigma modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/3031—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path
    • H03M7/3042—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path the modulator being of the error feedback type, i.e. having loop filter stages in the feedback path only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/302—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution
    • H03M7/3024—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only
    • H03M7/3026—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only the quantiser being a multiple bit one

Abstract

1444216 Digital - to - analogue conversion STANDARD TELEPHONES & CABLES Ltd 20 Feb 1975 7157/75 Heading H3H An analogue output is derived from a P.C.M. signal by increasing its sampling rate in interpolator 1, converting only the most significant bits to a pulse density signal in a rate-multiplier 3, and low-pass filtering 4 to give the analogue output. Noise is reduced by feeding back the least significant bits through a filter 12. The filter may comprise one or more delays whose outputs are combined with different weighting factors: several examples are described, Figs. 4, 8, 10, 11, not shown. The interpolator may be simply a recirculating register, Fig. 6, not shown, for merely repeating each P.C.M. word, e.g. 32 times or may be a linear interpolator, Fig. 7, not shown. D-to-A converter 3 comprises a synchronous binary counter 5, Fig. 2, fed with fast clock pulses fc, binarily weighted frequencies being obtained at its outputs A, B, C, D which are gated by the 4 most significant bits of the interpolated P.C.M. signal to produce a pulse train E of mean density corresponding to these 4 bits.
GB715775A 1975-02-20 1975-02-20 D/a converter for pcm Expired GB1444216A (en)

Priority Applications (20)

Application Number Priority Date Filing Date Title
GB715775A GB1444216A (en) 1975-02-20 1975-02-20 D/a converter for pcm
IN2355/CAL/75A IN143625B (en) 1975-02-20 1975-12-18
SU762309106A SU1132805A3 (en) 1975-02-20 1976-01-08 Digital-to-analog converter
AR262202A AR212019A1 (en) 1975-02-20 1976-02-10 DIGITAL TO ANALOG CONVERTER
NO760428A NO143776C (en) 1975-02-20 1976-02-11 DIGITAL / ANALOG CONVERTER.
NL7601414A NL7601414A (en) 1975-02-20 1976-02-12 DIGITAL TO ANALOG CONVERTER.
AU11100/76A AU497002B2 (en) 1975-02-20 1976-02-13 Pcm digital-to-analogue converter
DE2605724A DE2605724C2 (en) 1975-02-20 1976-02-13 Digital-to-analog converter for PCM-coded digital signals
SE7601666A SE410929B (en) 1975-02-20 1976-02-16 DIGITAL ANALOG CONVERTER
IT20224/76A IT1054867B (en) 1975-02-20 1976-02-17 DIGITAL HALOG CONVERTER FOR PULSE CODED MODULATED SIGNALS
BR7601013A BR7601013A (en) 1975-02-20 1976-02-18 DIGITAL TO ANALOG CONVERTER
BE2054833A BE838666A (en) 1975-02-20 1976-02-18 DIGITAL TO ANALOG CONVERTER
DK64976A DK148866C (en) 1975-02-20 1976-02-18 DIGITAL ANALOG CONVERTER
CH201976A CH607456A5 (en) 1975-02-20 1976-02-19
CA246,085A CA1093697A (en) 1975-02-20 1976-02-19 Digital-to-analogue converter
ES445387A ES445387A1 (en) 1975-02-20 1976-02-20 D/a converter for pcm
AT0121476A AT377397B (en) 1975-02-20 1976-02-20 METHOD FOR REDUCED DIGITAL-ANALOG CONVERSION AND REALIZER FOR IMPLEMENTING THE METHOD
FR7604733A FR2301971A1 (en) 1975-02-20 1976-02-20 DIGITAL-ANALOGUE CONVERTER FOR MIC SYSTEM
JP51017156A JPS51135354A (en) 1975-02-20 1976-02-20 Digitalltooanalog converter
US05/796,919 US4109110A (en) 1975-02-20 1977-05-16 Digital-to-analog converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB715775A GB1444216A (en) 1975-02-20 1975-02-20 D/a converter for pcm

Publications (1)

Publication Number Publication Date
GB1444216A true GB1444216A (en) 1976-07-28

Family

ID=9827708

Family Applications (1)

Application Number Title Priority Date Filing Date
GB715775A Expired GB1444216A (en) 1975-02-20 1975-02-20 D/a converter for pcm

Country Status (19)

Country Link
JP (1) JPS51135354A (en)
AR (1) AR212019A1 (en)
AT (1) AT377397B (en)
AU (1) AU497002B2 (en)
BE (1) BE838666A (en)
BR (1) BR7601013A (en)
CA (1) CA1093697A (en)
CH (1) CH607456A5 (en)
DE (1) DE2605724C2 (en)
DK (1) DK148866C (en)
ES (1) ES445387A1 (en)
FR (1) FR2301971A1 (en)
GB (1) GB1444216A (en)
IN (1) IN143625B (en)
IT (1) IT1054867B (en)
NL (1) NL7601414A (en)
NO (1) NO143776C (en)
SE (1) SE410929B (en)
SU (1) SU1132805A3 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2638816A1 (en) * 1975-08-28 1977-03-10 Sony Corp METHOD AND DEVICE FOR CONVERTING A PLURALBIT DIGITAL SIGNAL INTO A PULSE WIDTH MODULATED SIGNAL
FR2373193A1 (en) * 1976-12-01 1978-06-30 Post Office PROCESS FOR CONVERTING A SIGNAL WITH MODULATION BY CODED PULSES INTO ANALOGUE SIGNAL AND DEVICE FOR THE IMPLEMENTATION OF THE SAID PROCEDURE
FR2417894A1 (en) * 1978-02-21 1979-09-14 Philips Nv DEVICE FOR DECODING A CODE SIGNAL BY DELTA ADAPTABLE MODULATION
FR2483708A1 (en) * 1980-06-03 1981-12-04 Licentia Gmbh METHOD FOR GENERALIZED INTERPOLATION OF DIGITAL-TO-ANALOG CONVERSION OF PCM SIGNALS
DE3121972A1 (en) * 1980-06-10 1982-02-25 Western Electric Co., Inc., 10038 New York, N.Y. INTERPOLATOR
DE3203012A1 (en) * 1982-01-29 1983-08-04 Siemens AG, 1000 Berlin und 8000 München Method and circuit arrangement for generating interpolation values between stored samples
EP0142907A2 (en) * 1983-07-29 1985-05-29 Burr-Brown Corporation Apparatus and methods for analogue-to-digital and digital-to-analogue conversion
GB2166613A (en) * 1984-10-02 1986-05-08 Canon Kk Digital-analog conversion
GB2183115A (en) * 1985-11-15 1987-05-28 Philips Electronic Associated Digital to analogue converter
US4866595A (en) * 1982-09-07 1989-09-12 Canon Kabushiki Kaisha Image recording system for image recording in response to signals entered from a recording information generating unit
US4868572A (en) * 1987-02-28 1989-09-19 Alcatel N.V. Circuit arrangement for converting digital sound-signal values into an analog sound signal
USRE34660E (en) * 1983-07-29 1994-07-12 Burr-Brown Corporation Apparatus and methods for digital-to-analog conversion using modified LSB switching
US5548286A (en) * 1991-02-22 1996-08-20 B&W Loudspeakers Ltd. Analogue and digital convertors using pulse edge modulators with non-linearity error correction
GB2319411A (en) * 1996-11-18 1998-05-20 Fujitsu Ltd Signal transmission and reception

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2107949B (en) * 1981-10-15 1985-04-11 Standard Telephones Cables Ltd Digital decoder
JPS60106229A (en) * 1983-11-14 1985-06-11 Rohm Co Ltd D/a converting circuit of digital pwm circuit
JPS6184119A (en) * 1984-10-02 1986-04-28 Canon Inc Digital-analog converter
JPS6184117A (en) * 1984-10-02 1986-04-28 Canon Inc Digital-analog converter
JPS6184118A (en) * 1984-10-02 1986-04-28 Canon Inc Digital-analog converter
JPH0824267B2 (en) * 1984-10-02 1996-03-06 キヤノン株式会社 Data processing device
JPS6184120A (en) * 1984-10-02 1986-04-28 Canon Inc Digital-analog converter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110894A (en) * 1959-04-09 1963-11-12 Itt Digital-to-analog converter
US3532864A (en) * 1967-08-08 1970-10-06 United Aircraft Corp Linear interpolation function generation

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2638816A1 (en) * 1975-08-28 1977-03-10 Sony Corp METHOD AND DEVICE FOR CONVERTING A PLURALBIT DIGITAL SIGNAL INTO A PULSE WIDTH MODULATED SIGNAL
FR2373193A1 (en) * 1976-12-01 1978-06-30 Post Office PROCESS FOR CONVERTING A SIGNAL WITH MODULATION BY CODED PULSES INTO ANALOGUE SIGNAL AND DEVICE FOR THE IMPLEMENTATION OF THE SAID PROCEDURE
FR2417894A1 (en) * 1978-02-21 1979-09-14 Philips Nv DEVICE FOR DECODING A CODE SIGNAL BY DELTA ADAPTABLE MODULATION
FR2483708A1 (en) * 1980-06-03 1981-12-04 Licentia Gmbh METHOD FOR GENERALIZED INTERPOLATION OF DIGITAL-TO-ANALOG CONVERSION OF PCM SIGNALS
DE3021012A1 (en) * 1980-06-03 1981-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt GENERALIZED INTERPOLATIVE METHOD FOR THE DIGITAL-ANALOG CONVERSION OF PCM SIGNALS
US4467316A (en) * 1980-06-03 1984-08-21 Licentia Patent-Verwaltungs-Gmbh Generalized interpolative method for digital/analog conversion of PCM signals
DE3121972A1 (en) * 1980-06-10 1982-02-25 Western Electric Co., Inc., 10038 New York, N.Y. INTERPOLATOR
DE3203012A1 (en) * 1982-01-29 1983-08-04 Siemens AG, 1000 Berlin und 8000 München Method and circuit arrangement for generating interpolation values between stored samples
US4866595A (en) * 1982-09-07 1989-09-12 Canon Kabushiki Kaisha Image recording system for image recording in response to signals entered from a recording information generating unit
EP0142907A3 (en) * 1983-07-29 1986-10-08 Burr-Brown Corporation Apparatus and methods for analogue-to-digital and digital-to-analogue conversion
EP0142907A2 (en) * 1983-07-29 1985-05-29 Burr-Brown Corporation Apparatus and methods for analogue-to-digital and digital-to-analogue conversion
USRE34660E (en) * 1983-07-29 1994-07-12 Burr-Brown Corporation Apparatus and methods for digital-to-analog conversion using modified LSB switching
GB2166613A (en) * 1984-10-02 1986-05-08 Canon Kk Digital-analog conversion
GB2166613B (en) * 1984-10-02 1989-05-24 Canon Kk Digital-analog converting apparatus
GB2183115A (en) * 1985-11-15 1987-05-28 Philips Electronic Associated Digital to analogue converter
US4868572A (en) * 1987-02-28 1989-09-19 Alcatel N.V. Circuit arrangement for converting digital sound-signal values into an analog sound signal
US5548286A (en) * 1991-02-22 1996-08-20 B&W Loudspeakers Ltd. Analogue and digital convertors using pulse edge modulators with non-linearity error correction
US6031481A (en) * 1991-02-22 2000-02-29 B & W Loudspeakers Ltd. Analogue and digital converters
US6232899B1 (en) 1991-02-22 2001-05-15 Cirrus Logic Inc. Analogue and digital convertors
GB2319411A (en) * 1996-11-18 1998-05-20 Fujitsu Ltd Signal transmission and reception
US6052410A (en) * 1996-11-18 2000-04-18 Fujitsu Limited Transmission apparatus, reception apparatus and communication apparatus as well as modem signal transmission and reception method
GB2319411B (en) * 1996-11-18 2000-11-15 Fujitsu Ltd Modem signal transmission and/or reception apparatus

Also Published As

Publication number Publication date
NL7601414A (en) 1976-08-24
NO143776B (en) 1980-12-29
DK148866C (en) 1986-04-21
DK64976A (en) 1976-08-21
BR7601013A (en) 1976-09-14
DK148866B (en) 1985-10-28
SE410929B (en) 1979-11-12
DE2605724C2 (en) 1986-01-23
NO760428L (en) 1976-08-23
DE2605724A1 (en) 1976-09-02
AT377397B (en) 1985-03-11
AR212019A1 (en) 1978-04-28
CA1093697A (en) 1981-01-13
AU497002B2 (en) 1978-11-16
ATA121476A (en) 1984-07-15
ES445387A1 (en) 1977-06-16
FR2301971B1 (en) 1982-07-23
SE7601666L (en) 1976-08-23
JPS5542774B2 (en) 1980-11-01
JPS51135354A (en) 1976-11-24
AU1110076A (en) 1977-08-18
NO143776C (en) 1981-04-08
BE838666A (en) 1976-08-18
IN143625B (en) 1978-01-07
IT1054867B (en) 1981-11-30
SU1132805A3 (en) 1984-12-30
FR2301971A1 (en) 1976-09-17
CH607456A5 (en) 1978-12-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19950219