NO992777D0 - Method and apparatus for signal processing - Google Patents
Method and apparatus for signal processingInfo
- Publication number
- NO992777D0 NO992777D0 NO992777A NO992777A NO992777D0 NO 992777 D0 NO992777 D0 NO 992777D0 NO 992777 A NO992777 A NO 992777A NO 992777 A NO992777 A NO 992777A NO 992777 D0 NO992777 D0 NO 992777D0
- Authority
- NO
- Norway
- Prior art keywords
- signal
- sigma
- delta modulator
- pdm
- noise ratio
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
-
- 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
- H03M3/458—Analogue/digital converters using delta-sigma modulation as an intermediate step
-
- 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
- H03M7/3028—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 single bit one
-
- 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
- H03M7/3033—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 having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs
- H03M7/304—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 having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs with distributed feedback, i.e. with feedback paths from the quantiser output to more than one filter stage
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The invention relates to digital signal processing and specificly to level control of a pulse density modulated (PDM) signal generated by a sigma-delta modulator. A single-bit pulse density modulated PDM signal is generated by a first sigma-delta modulator (2) being an analog modulator, for instance. Level control is performed by multiplying the single-bit pulse density modulated PDM signal by a multibit multiplier (300) to obtain a multibit number stream, which is reconverted into a single-bit PDM signal by a second digital sigma-delta modulator (4). In accordance with the invention, the performance of the second sigma-delta modulator (4) is better than that of the first sigma-delta modulator (2), as to the signal-to-noise ratio. Thus, the most significant factor in the total signal-to-noise ratio (SNR) is the noise level of the first sigma-delta modulator (2), by which the PDM signal was originally generated. In the subsequent second sigma-delta modulator (4), the PDM signal can then be attenuated as much as is the difference between the SNR performances of the modulators without any decrease in the total signal-to-noise ratio. A relative amplification of the PDM signal is provided in this manner.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI973919A FI103745B (en) | 1997-10-09 | 1997-10-09 | Signal processing method and device |
PCT/US1998/017743 WO1999020004A1 (en) | 1997-10-09 | 1998-08-26 | Signal processing method and device |
Publications (2)
Publication Number | Publication Date |
---|---|
NO992777D0 true NO992777D0 (en) | 1999-06-08 |
NO992777L NO992777L (en) | 1999-07-28 |
Family
ID=8549695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO992777A NO992777L (en) | 1997-10-09 | 1999-06-08 | Method and apparatus for signal processing |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1021876A4 (en) |
JP (1) | JP2002510455A (en) |
KR (1) | KR20010012348A (en) |
CN (1) | CN1112777C (en) |
CA (1) | CA2274637A1 (en) |
FI (1) | FI103745B (en) |
HK (1) | HK1025695A1 (en) |
MY (1) | MY133001A (en) |
NO (1) | NO992777L (en) |
TW (1) | TW408531B (en) |
WO (1) | WO1999020004A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1195353C (en) | 2001-12-03 | 2005-03-30 | 方虎堂 | Pulse area modulation digital power processing method and device |
US6606044B2 (en) * | 2002-01-02 | 2003-08-12 | Motorola, Inc. | Method and apparatus for generating a pulse width modulated signal |
KR101853818B1 (en) | 2011-07-29 | 2018-06-15 | 삼성전자주식회사 | Method for processing audio signal and apparatus for processing audio signal thereof |
EP2927805A1 (en) * | 2014-03-31 | 2015-10-07 | Nxp B.V. | Control system |
TWI559202B (en) * | 2014-10-01 | 2016-11-21 | 義隆電子股份有限公司 | Capacitive touch device and exciting signal generating circuit and method thereof |
CN110310635B (en) * | 2019-06-24 | 2022-03-22 | Oppo广东移动通信有限公司 | Voice processing circuit and electronic equipment |
US11303295B1 (en) * | 2020-11-15 | 2022-04-12 | xMEMS Labs, Inc. | SDM encoder and related signal processing system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01204528A (en) * | 1988-02-10 | 1989-08-17 | Fujitsu Ltd | A/d converter |
EP0586021B1 (en) * | 1990-01-31 | 1996-11-27 | Analog Devices, Inc. | Digital noise shaper circuit |
US5245344A (en) * | 1991-01-15 | 1993-09-14 | Crystal Semiconductor | High order switched-capacitor filter with dac input |
US5625358A (en) * | 1993-09-13 | 1997-04-29 | Analog Devices, Inc. | Digital phase-locked loop utilizing a high order sigma-delta modulator |
US5442353A (en) * | 1993-10-25 | 1995-08-15 | Motorola, Inc. | Bandpass sigma-delta analog-to-digital converter (ADC), method therefor, and receiver using same |
US5748126A (en) * | 1996-03-08 | 1998-05-05 | S3 Incorporated | Sigma-delta digital-to-analog conversion system and process through reconstruction and resampling |
JPH09266447A (en) * | 1996-03-28 | 1997-10-07 | Sony Corp | Word length conversion device and data processor |
-
1997
- 1997-10-09 FI FI973919A patent/FI103745B/en active
-
1998
- 1998-08-26 EP EP98942269A patent/EP1021876A4/en not_active Ceased
- 1998-08-26 WO PCT/US1998/017743 patent/WO1999020004A1/en active IP Right Grant
- 1998-08-26 KR KR1019997010300A patent/KR20010012348A/en active IP Right Grant
- 1998-08-26 CA CA002274637A patent/CA2274637A1/en not_active Abandoned
- 1998-08-26 JP JP52178599A patent/JP2002510455A/en not_active Ceased
- 1998-08-26 CN CN98804731A patent/CN1112777C/en not_active Expired - Fee Related
- 1998-10-01 MY MYPI98004505A patent/MY133001A/en unknown
- 1998-12-11 TW TW087120605A patent/TW408531B/en not_active IP Right Cessation
-
1999
- 1999-06-08 NO NO992777A patent/NO992777L/en not_active Application Discontinuation
-
2000
- 2000-08-03 HK HK00104859A patent/HK1025695A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
MY133001A (en) | 2007-10-31 |
EP1021876A4 (en) | 2003-05-02 |
CA2274637A1 (en) | 1999-04-22 |
NO992777L (en) | 1999-07-28 |
TW408531B (en) | 2000-10-11 |
FI103745B1 (en) | 1999-08-31 |
FI103745B (en) | 1999-08-31 |
KR20010012348A (en) | 2001-02-15 |
JP2002510455A (en) | 2002-04-02 |
CN1112777C (en) | 2003-06-25 |
EP1021876A1 (en) | 2000-07-26 |
FI973919A (en) | 1999-04-10 |
HK1025695A1 (en) | 2000-11-17 |
FI973919A0 (en) | 1997-10-09 |
CN1256037A (en) | 2000-06-07 |
WO1999020004A1 (en) | 1999-04-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FC2A | Withdrawal, rejection or dismissal of laid open patent application |