WO2000059111A1 - Converter - Google Patents
Converter Download PDFInfo
- Publication number
- WO2000059111A1 WO2000059111A1 PCT/EP2000/001901 EP0001901W WO0059111A1 WO 2000059111 A1 WO2000059111 A1 WO 2000059111A1 EP 0001901 W EP0001901 W EP 0001901W WO 0059111 A1 WO0059111 A1 WO 0059111A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pass filter
- low pass
- converter
- signal
- output signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
- H03H17/0621—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
- H03H17/0635—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies
- H03H17/065—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer
- H03H17/0657—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0283—Filters characterised by the filter structure
- H03H17/0286—Combinations of filter structures
- H03H17/0291—Digital and sampled data filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
Definitions
- the invention relates to a converter as described in the preamble of Claim 1.
- Converters comprising a D/A converter and a low pass filter are known in the art.
- oversampled converters are used in audio reproduction systems in combination with a digital upsampling low pass filter followed by either an analog time continuous or a time discrete low pas filter which is needed to remove the remaining high frequency content of the output signal.
- the sampling frequencies of the input data of the converter and of the time discrete low pas filter are mostly equal or have a fixed ratio.
- the initial signal band width can be very high but a large amount of high frequency noise is generated in the delta sigma conversion, which sometimes can overload the connected audio equipment. In which case the bandwidth of the output signal has to be reduced.
- a converter according to the invention comprises the features as claimed in claim 1.
- the Figure shows a block schematic example of a converter according to the invention.
- the figure shows an example of a converter CON according to the invention comprising an input I for receiving a digital input signal Si.
- the input is coupled with a D/A converter DAC for converting the received digital input signal Si into an analog signal Sa.
- a filtering is necessary in a low pass filter LPF.
- This low pass filter comprises a control input for controlling the pass frequency of the filter with a control signal C.
- the output of the low pass filter LPF is coupled to the output O of the converter CON for supplying an output signal So.
- the cut off frequency of the low pass filter LPF is chosen 20 kHz.
- the sampling frequency of the low pass filter with a multiple of 64 times 44.1 kHz the output bandwidth will increase to for example 40, 60 or 80 kHz, without the need for extra analog hardware.
- the control means CM generate a control signal C to be supplied to the control input of the low pass filter LPF.
- the control means will detect (not indicated in the figure) the high frequency noise and will on the basis of this detection or expected high frequency noise supply the control signal C.
- the control signal C will determine the pass frequency range of the low pass filter LPF.
- the D/A converter DAC has a sampling frequency N*Fs
- control means CM are coupled via a dashed line with the D/A converter for supplying a control signal C '.
- this dashed line is is indicated that the control means can be coupled with the low pass filter LPF, or the D/A converter DAC or with both.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Analogue/Digital Conversion (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000608503A JP2002540710A (en) | 1999-03-26 | 2000-03-06 | converter |
EP00920477A EP1082813A1 (en) | 1999-03-26 | 2000-03-06 | Digital-to-analog convertor |
KR1020007013317A KR20010043852A (en) | 1999-03-26 | 2000-03-06 | Converter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99200933.2 | 1999-03-26 | ||
EP99200933 | 1999-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000059111A1 true WO2000059111A1 (en) | 2000-10-05 |
Family
ID=8240030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/001901 WO2000059111A1 (en) | 1999-03-26 | 2000-03-06 | Converter |
Country Status (6)
Country | Link |
---|---|
US (1) | US6636170B1 (en) |
EP (1) | EP1082813A1 (en) |
JP (1) | JP2002540710A (en) |
KR (1) | KR20010043852A (en) |
CN (1) | CN1300466A (en) |
WO (1) | WO2000059111A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7110795B2 (en) | 2001-08-31 | 2006-09-19 | Sanyo Electric Co., Ltd. | Radio apparatus, method for receiving its signal, method for measuring its filter coefficient, and program for measuring its filter coefficient |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7652611B2 (en) * | 2008-05-20 | 2010-01-26 | Analog Devices, Inc. | Front-end sampling technique for analog-to-digital converters |
KR101014364B1 (en) * | 2008-10-28 | 2011-02-15 | 박일용 | Apparatus for measuring to inspect a sunroof assembly for vehicle |
JP2010154389A (en) * | 2008-12-26 | 2010-07-08 | Yamaha Corp | Band dividing apparatus |
CN104333385A (en) * | 2014-08-25 | 2015-02-04 | 长沙瑞达星微电子有限公司 | Bandwidth programmable DAC structure for pass-band |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4782324A (en) * | 1987-05-06 | 1988-11-01 | Genrad, Inc. | Digital signal synthesizer |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3709207A1 (en) * | 1987-02-28 | 1988-09-08 | Standard Elektrik Lorenz Ag | CIRCUIT ARRANGEMENT FOR CONVERTING DIGITAL TONE SIGNAL VALUES TO ANALOG TONE |
JPH0728470B2 (en) * | 1989-02-03 | 1995-03-29 | 松下電器産業株式会社 | Array microphone |
US5278558A (en) * | 1992-07-21 | 1994-01-11 | Rockwell International Corporation | High accuracy digital to analog converter adjustment method and apparatus |
US5712635A (en) * | 1993-09-13 | 1998-01-27 | Analog Devices Inc | Digital to analog conversion using nonuniform sample rates |
US5617090A (en) * | 1995-05-10 | 1997-04-01 | Harris Corporation | Multi-channel sigma-delta A/D converters with improved throughput |
DE59710269D1 (en) * | 1997-07-02 | 2003-07-17 | Micronas Semiconductor Holding | Filter combination for sample rate conversion |
US6144712A (en) * | 1997-10-09 | 2000-11-07 | Broadcom Corporation | Variable rate modulator |
-
2000
- 2000-03-06 JP JP2000608503A patent/JP2002540710A/en not_active Withdrawn
- 2000-03-06 EP EP00920477A patent/EP1082813A1/en not_active Withdrawn
- 2000-03-06 WO PCT/EP2000/001901 patent/WO2000059111A1/en not_active Application Discontinuation
- 2000-03-06 KR KR1020007013317A patent/KR20010043852A/en not_active Application Discontinuation
- 2000-03-06 CN CN00800397A patent/CN1300466A/en active Pending
- 2000-03-24 US US09/534,213 patent/US6636170B1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4782324A (en) * | 1987-05-06 | 1988-11-01 | Genrad, Inc. | Digital signal synthesizer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7110795B2 (en) | 2001-08-31 | 2006-09-19 | Sanyo Electric Co., Ltd. | Radio apparatus, method for receiving its signal, method for measuring its filter coefficient, and program for measuring its filter coefficient |
Also Published As
Publication number | Publication date |
---|---|
US6636170B1 (en) | 2003-10-21 |
JP2002540710A (en) | 2002-11-26 |
EP1082813A1 (en) | 2001-03-14 |
CN1300466A (en) | 2001-06-20 |
KR20010043852A (en) | 2001-05-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1445871B1 (en) | Integrated multi-mode bandpass sigma-delta receiver subsystem with interference mitigation and method of using same | |
JP4272744B2 (en) | Sigma-delta modulator and method for digitizing a signal | |
US5313205A (en) | Method for varying the interpolation ratio of a digital oversampling digital-to-analog converter system and apparatus therefor | |
US7339510B2 (en) | Accumulator for adaptive sigma-delta modulation | |
WO1996016482A9 (en) | Variable sample rate adc | |
WO1996016482A1 (en) | Variable sample rate adc | |
JP3769339B2 (en) | Data converter and method with variable sampling rate | |
US6636170B1 (en) | Signal converter with digital/analog conversion and noise-dependent variability of output signal bandwidth | |
JPH09153806A (en) | Signal processor | |
US6034629A (en) | Analog-to-digital conversion apparatus | |
US6172628B1 (en) | Tone modulation with square wave | |
KR19980020740A (en) | Digital / Analog (D / A) Converter | |
US20030107507A1 (en) | Over-sampling digital-to-analog converter with variable sampling frequencies | |
EP1678832A1 (en) | Delta sigma modulator with integral decimation | |
JP2004080076A (en) | Apparatus and method for processing digital signal | |
JP3040546B2 (en) | Noise shaping A / D converter | |
CA2540146C (en) | Accumulator for adaptive sigma-delta modulation | |
EP1424780A2 (en) | Delta-sigma modulator, method of switching delta-sigma modulator, and digital amplifier | |
JPH02211720A (en) | A/d converting device | |
JP2002261616A (en) | D/a conversion device | |
Blad et al. | Design trade-offs for linear-phase FIR decimation filters and ΣΔ-modulators | |
Higaki et al. | Design method of a 1-bit digital filter using a new 2-Degree-of-Freedom control | |
JPS63131734A (en) | Fm-digital conversion circuit |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 00800397.1 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN JP KR |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2000920477 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020007013317 Country of ref document: KR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 2000920477 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020007013317 Country of ref document: KR |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2000920477 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1020007013317 Country of ref document: KR |