JPS5571315A - Limit cycle reduction system of digital filter - Google Patents

Limit cycle reduction system of digital filter

Info

Publication number
JPS5571315A
JPS5571315A JP14412078A JP14412078A JPS5571315A JP S5571315 A JPS5571315 A JP S5571315A JP 14412078 A JP14412078 A JP 14412078A JP 14412078 A JP14412078 A JP 14412078A JP S5571315 A JPS5571315 A JP S5571315A
Authority
JP
Japan
Prior art keywords
signals
limit cycle
digital
digital filter
input
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
JP14412078A
Other languages
Japanese (ja)
Inventor
Masao Kasuga
Masaaki Sato
Takashi Matsushige
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP14412078A priority Critical patent/JPS5571315A/en
Priority to US06/095,554 priority patent/US4321685A/en
Publication of JPS5571315A publication Critical patent/JPS5571315A/en
Pending legal-status Critical Current

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
    • H03H17/04—Recursive filters
    • H03H17/0461—Quantisation; Rounding; Truncation; Overflow oscillations or limit cycles eliminating measures

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To reduce the limit cycle generated when input signals are not inputted to a digital filter, by providing a limit cycle reducing circuit. CONSTITUTION:Analogue signals inputted to input terminal 1 are converted to digital signals by A/D converter 2. Next, these digital signals are inputted to D/A converter circuit 4 after the digital operation of a finite word length in digital filter 3, and signals where a prescribed frequency characteristic is given are obtained at output terminal 5. In limit cycle reducing circuit 6, presence or absence of input analogue signals is detected; and if input analogue signals are absent for a fixed time, output signals of integrator 7 which passed switch 8 are supplied to adder 10 and are added to the reference voltage from reference voltage generation source 11 to change the zero level reference voltage of A/D converter 2. Thus, output signals of output terminal 5 converge to 0, and the limit cycle is eliminated.
JP14412078A 1978-11-20 1978-11-24 Limit cycle reduction system of digital filter Pending JPS5571315A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP14412078A JPS5571315A (en) 1978-11-24 1978-11-24 Limit cycle reduction system of digital filter
US06/095,554 US4321685A (en) 1978-11-20 1979-11-19 Circuit for reducing the limit cycle in a digital filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14412078A JPS5571315A (en) 1978-11-24 1978-11-24 Limit cycle reduction system of digital filter

Publications (1)

Publication Number Publication Date
JPS5571315A true JPS5571315A (en) 1980-05-29

Family

ID=15354647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14412078A Pending JPS5571315A (en) 1978-11-20 1978-11-24 Limit cycle reduction system of digital filter

Country Status (1)

Country Link
JP (1) JPS5571315A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0239717A (en) * 1988-07-29 1990-02-08 Nec Corp Circulation type digital filter
JPH0311813A (en) * 1989-06-08 1991-01-21 Kenwood Corp Digital filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0239717A (en) * 1988-07-29 1990-02-08 Nec Corp Circulation type digital filter
JPH0311813A (en) * 1989-06-08 1991-01-21 Kenwood Corp Digital filter

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