GB1444216A - D/a converter for pcm - Google Patents
D/a converter for pcmInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Computing Systems (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Computational Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Networks Using Active Elements (AREA)
- Oscillators With Electromechanical Resonators (AREA)
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.
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. |
DE2605724A DE2605724C2 (en) | 1975-02-20 | 1976-02-13 | Digital-to-analog converter for PCM-coded digital signals |
AU11100/76A AU497002B2 (en) | 1975-02-20 | 1976-02-13 | Pcm digital-to-analogue converter |
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 |
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 |
BR7601013A BR7601013A (en) | 1975-02-20 | 1976-02-18 | DIGITAL TO 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 |
JP51017156A JPS51135354A (en) | 1975-02-20 | 1976-02-20 | Digitalltooanalog converter |
FR7604733A FR2301971A1 (en) | 1975-02-20 | 1976-02-20 | DIGITAL-ANALOGUE CONVERTER FOR MIC SYSTEM |
AT0121476A AT377397B (en) | 1975-02-20 | 1976-02-20 | METHOD FOR REDUCED DIGITAL-ANALOG CONVERSION AND REALIZER FOR IMPLEMENTING THE METHOD |
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)
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)
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 |
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 |
JPS6184119A (en) * | 1984-10-02 | 1986-04-28 | Canon Inc | Digital-analog converter |
JPS6184120A (en) * | 1984-10-02 | 1986-04-28 | Canon Inc | Digital-analog converter |
Family Cites Families (2)
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 |
-
1975
- 1975-02-20 GB GB715775A patent/GB1444216A/en not_active Expired
- 1975-12-18 IN IN2355/CAL/75A patent/IN143625B/en unknown
-
1976
- 1976-01-08 SU SU762309106A patent/SU1132805A3/en active
- 1976-02-10 AR AR262202A patent/AR212019A1/en active
- 1976-02-11 NO NO760428A patent/NO143776C/en unknown
- 1976-02-12 NL NL7601414A patent/NL7601414A/en not_active Application Discontinuation
- 1976-02-13 DE DE2605724A patent/DE2605724C2/en not_active Expired
- 1976-02-13 AU AU11100/76A patent/AU497002B2/en not_active Expired
- 1976-02-16 SE SE7601666A patent/SE410929B/en not_active IP Right Cessation
- 1976-02-17 IT IT20224/76A patent/IT1054867B/en active
- 1976-02-18 BE BE2054833A patent/BE838666A/en not_active IP Right Cessation
- 1976-02-18 BR BR7601013A patent/BR7601013A/en unknown
- 1976-02-18 DK DK64976A patent/DK148866C/en not_active IP Right Cessation
- 1976-02-19 CH CH201976A patent/CH607456A5/xx not_active IP Right Cessation
- 1976-02-19 CA CA246,085A patent/CA1093697A/en not_active Expired
- 1976-02-20 ES ES445387A patent/ES445387A1/en not_active Expired
- 1976-02-20 AT AT0121476A patent/AT377397B/en not_active IP Right Cessation
- 1976-02-20 FR FR7604733A patent/FR2301971A1/en active Granted
- 1976-02-20 JP JP51017156A patent/JPS51135354A/en active Granted
Cited By (22)
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 |
---|---|
CH607456A5 (en) | 1978-12-29 |
NO143776C (en) | 1981-04-08 |
DE2605724C2 (en) | 1986-01-23 |
SE7601666L (en) | 1976-08-23 |
AR212019A1 (en) | 1978-04-28 |
NO143776B (en) | 1980-12-29 |
FR2301971A1 (en) | 1976-09-17 |
DK64976A (en) | 1976-08-21 |
JPS51135354A (en) | 1976-11-24 |
DK148866C (en) | 1986-04-21 |
ES445387A1 (en) | 1977-06-16 |
SE410929B (en) | 1979-11-12 |
ATA121476A (en) | 1984-07-15 |
DK148866B (en) | 1985-10-28 |
JPS5542774B2 (en) | 1980-11-01 |
CA1093697A (en) | 1981-01-13 |
IN143625B (en) | 1978-01-07 |
FR2301971B1 (en) | 1982-07-23 |
BE838666A (en) | 1976-08-18 |
IT1054867B (en) | 1981-11-30 |
AT377397B (en) | 1985-03-11 |
NO760428L (en) | 1976-08-23 |
DE2605724A1 (en) | 1976-09-02 |
BR7601013A (en) | 1976-09-14 |
NL7601414A (en) | 1976-08-24 |
AU1110076A (en) | 1977-08-18 |
SU1132805A3 (en) | 1984-12-30 |
AU497002B2 (en) | 1978-11-16 |
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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 |