CN1300466A - 转换器 - Google Patents

转换器 Download PDF

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Publication number
CN1300466A
CN1300466A CN00800397A CN00800397A CN1300466A CN 1300466 A CN1300466 A CN 1300466A CN 00800397 A CN00800397 A CN 00800397A CN 00800397 A CN00800397 A CN 00800397A CN 1300466 A CN1300466 A CN 1300466A
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China
Prior art keywords
pass filter
low pass
signal
converter
output signal
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CN00800397A
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E·C·迪克曼斯
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Publication of CN1300466A publication Critical patent/CN1300466A/zh
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    • 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

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  • 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

转换器被用于将数字式信号转换为模拟信号或将模拟信号转换为数字式信号。在一个音频重放系统中,一个过采样转换器和一个数字式向上采样的低通滤波器被结合在一起使用,所述低通滤波器可以是模拟时间连续或时间离散低通滤波器,所述低通滤波器被用于除去输出信号中残余的高频内容。为了使所获得的输出信号的频带尽可能地宽,本发明提供一种具有可变比率的不同采样频率的转换器。

Description

转换器
本发明涉及一种如权利要求1前序部分所述的转换器。
包含一个D/A转换器和一个低通滤波器的转换器在本领域是众所周知的。例如与一个数字式向上采样的低通滤波器相结合，过采样转换器被用于音频重放系统，所述低通滤波器可以是模拟时间连续或时间离散低通滤波器，该低通滤波器被用于除去输出信号中残余的高频内容。转换器输入数据的采样频率和时间离散低通滤波器的采样频率通常相同或彼此之间具有一个固定的比率。
在使用增量总和类型的噪音整形转换器的系统中，初始信号的频带宽度可以非常高，但是在增量总和变换中产生大量的高频噪音，有时使被连接的音频设备过载，所述增量总和类型被推荐而为SACD操作者使用。在这种情况下，必须减小输出信号的频带宽度。
本发明的目的是提供一种克服现有技术缺陷的转换器。为了实现这个目的，根据本发明的转换器具有如权利要求1所述的特征。
用此方式，通过改变噪音整形D/A输入数据和(时间离散)低通滤波器的采样频率的比率，就可根据噪音来修正输出信号的频带宽度。
在从属权利要求中描述了本发明的实施例。
通过下文结合附图对本发明的示例所做的详尽的描述，本发明和附加特征将变得更加明确。
附图显示了根据本发明的一种转换器框式示范例。
附图显示了一种根据本发明的转换器CON的示范例，转换器CON包括一个输入端I，所述输入端I用来接收数字式输入信号Si，所述输入端与一个D/A转换器DAC相耦连，所述D/A转换器DAC用于将所输入的数字式信号Si转换为模拟信号Sa。在模拟信号被提供给输出端So之前，在一个低通滤波器LPF中进行滤波是必须的。所述低通滤波器包括一个控制输入端，该控制输入端利用一个控制信号C来控制滤波器的通过频率。低通滤波器LPF的输出端耦连到转换器CON的输出端O上而用于提供一个输出信号So。
通过修正低通滤波器的通过范围，就能够克服现有技术的缺陷，从而，高频噪音能够被过载在所连接的音频设备上。
作为一个示范例，当D/A转换器和低通滤波器LPF均以44.1kHz的64倍运行时，低通滤波器LPF的截止频率就选择为20kHz。以64倍的44.1kHz的倍数增加低通滤波器采样频率，在不需要额外的模拟硬件的情况下，输出频带宽度将增加到例如40、60或80kHz。
控制装置CM产生一个控制信号C，并被提供给低通滤波器LPF的控制输入端。控制装置将检测(图中没有指示)高频噪音并在所检测或期望的高频噪音的基础上来提供控制信号C。控制信号C将决定低通滤波器LPF的通过频率范围。
当输入信号Si具有一个采样频率Fs时，D/A转换器DAC具有一个采样频率N*Fs，低通滤波器LPF具有一个采样频率M*Fs，此时，M＞=N。
在现有技术中，N=M=1
在图中，控制装置CM通过一条虚线与D/A转换器相耦连并用于提供控制信号C′，通过这条虚线表明，控制装置可以与低通滤波器LPF相耦连或与D/A转换器DAC相耦连，或与两者均相耦连。
通过使输入信号Si和D/A转换器或低通滤波器的采样频率的比率进行变化，就可根据高频噪音而修正低通滤波器的通过范围。用此方式，就可克服被连接的音频设备的过载。

Claims (4)

1一种包含一个D/A转换器和一个低通滤波器的转换器，其特征在于：转换器包括用于修正D/A输入信号和D/A输出信号或低通滤波器的采样频率的比率的控制装置。
2一种根据权利要求1的转换器，其特征在于：所述控制装置与低通滤波器相耦连而用于提供一个控制信号。
3一种根据权利要求1的转换器，其特征在于：所述控制装置与D/A转换器相耦连而用于提供一个控制信号。
4一种根据权利要求1的转换器，其特征在于：所述D/A输入信号的采样频率为Fs，D/A输出信号的采样频率为N*Fs，低通滤波器的采样频率为M*Fs，M＞=N，其中，M和/或N是依据控制装置的控制信号而确定的。
CN00800397A 1999-03-26 2000-03-06 转换器 Pending CN1300466A (zh)

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EP99200933 1999-03-26
EP99200933.2 1999-03-26

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CN1300466A true CN1300466A (zh) 2001-06-20

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US (1) US6636170B1 (zh)
EP (1) EP1082813A1 (zh)
JP (1) JP2002540710A (zh)
KR (1) KR20010043852A (zh)
CN (1) CN1300466A (zh)
WO (1) WO2000059111A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
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
CN102067454A (zh) * 2008-05-20 2011-05-18 美国亚德诺半导体公司 用于模数转换器的前端采样技术
CN104333385A (zh) * 2014-08-25 2015-02-04 长沙瑞达星微电子有限公司 一种通带带宽可编程的dac结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101014364B1 (ko) * 2008-10-28 2011-02-15 박일용 차량용 선루프 검사용 측정장치
JP2010154389A (ja) * 2008-12-26 2010-07-08 Yamaha Corp 帯域分割装置

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DE3709207A1 (de) * 1987-02-28 1988-09-08 Standard Elektrik Lorenz Ag Schaltungsanordnung zum umwandeln von digitalen tonsignalwerten in ein analoges tonsignal
US4782324A (en) * 1987-05-06 1988-11-01 Genrad, Inc. Digital signal synthesizer
JPH0728470B2 (ja) * 1989-02-03 1995-03-29 松下電器産業株式会社 アレイマイクロホン
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
EP0889588B1 (de) * 1997-07-02 2003-06-11 Micronas Semiconductor Holding AG Filterkombination zur Abtastratenumsetzung
US6144712A (en) * 1997-10-09 2000-11-07 Broadcom Corporation Variable rate modulator

Cited By (4)

* Cited by examiner, † Cited by third party
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
CN102067454A (zh) * 2008-05-20 2011-05-18 美国亚德诺半导体公司 用于模数转换器的前端采样技术
CN102067454B (zh) * 2008-05-20 2014-04-30 美国亚德诺半导体公司 用于模数转换器的前端采样技术
CN104333385A (zh) * 2014-08-25 2015-02-04 长沙瑞达星微电子有限公司 一种通带带宽可编程的dac结构

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US6636170B1 (en) 2003-10-21
KR20010043852A (ko) 2001-05-25
JP2002540710A (ja) 2002-11-26
EP1082813A1 (en) 2001-03-14
WO2000059111A1 (en) 2000-10-05

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