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JPS644128A - Pcm modulation demodulation circuit - Google Patents

Pcm modulation demodulation circuit

Info

Publication number
JPS644128A
JPS644128A JP15908287A JP15908287A JPS644128A JP S644128 A JPS644128 A JP S644128A JP 15908287 A JP15908287 A JP 15908287A JP 15908287 A JP15908287 A JP 15908287A JP S644128 A JPS644128 A JP S644128A
Authority
JP
Japan
Prior art keywords
frequency
sampling frequency
pcm
constitution
lpf
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.)
Pending
Application number
JP15908287A
Other languages
Japanese (ja)
Inventor
Hideyuki Goto
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP15908287A priority Critical patent/JPS644128A/en
Publication of JPS644128A publication Critical patent/JPS644128A/en
Pending legal-status Critical Current

Links

Landscapes

  • Analogue/Digital Conversion (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To obtain an LPF following surely a change in a sampling frequency with simple circuit constitution by setting a switching frequency to drive a switched capacitor filter to a constant multiple of a PCM sampling frequency. CONSTITUTION:A PCM modulation circuit consists of a switched capacitor (SCP)1 constituted as an LPF, an A/D converter 2 and a frequency divider 3. Through the constitution above, the cut-off frequency of the SCP1 is set to fs/2 or below with respect to the sampling frequency fs. In varying the sampling frequency in the PCM modulating circuit, a clock signal fc synchronizing therewith is varied. Then a PCM demodulating circuit consists of a D/A converter 7, an SCP 8 and a frequency divider 9. Through such constitution as above, when the sampling frequency fs is changed, the cut-off frequency of the LPF is varied in following to the change in the sampling frequency.
JP15908287A 1987-06-26 1987-06-26 Pcm modulation demodulation circuit Pending JPS644128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15908287A JPS644128A (en) 1987-06-26 1987-06-26 Pcm modulation demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15908287A JPS644128A (en) 1987-06-26 1987-06-26 Pcm modulation demodulation circuit

Publications (1)

Publication Number Publication Date
JPS644128A true JPS644128A (en) 1989-01-09

Family

ID=15685832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15908287A Pending JPS644128A (en) 1987-06-26 1987-06-26 Pcm modulation demodulation circuit

Country Status (1)

Country Link
JP (1) JPS644128A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007151847A (en) * 2005-12-06 2007-06-21 Heiwa Mannequin Co Ltd Supporting clasp
US8067469B2 (en) 2002-05-08 2011-11-29 Woodstream Corporation System for trapping flying insects with attractant lures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8067469B2 (en) 2002-05-08 2011-11-29 Woodstream Corporation System for trapping flying insects with attractant lures
US8470881B2 (en) 2002-05-08 2013-06-25 Woodstream Corporation System for trapping flying insects with attractant lures
JP2007151847A (en) * 2005-12-06 2007-06-21 Heiwa Mannequin Co Ltd Supporting clasp

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