JPS56158525A - Circulation type digital filter - Google Patents

Circulation type digital filter

Info

Publication number
JPS56158525A
JPS56158525A JP6250480A JP6250480A JPS56158525A JP S56158525 A JPS56158525 A JP S56158525A JP 6250480 A JP6250480 A JP 6250480A JP 6250480 A JP6250480 A JP 6250480A JP S56158525 A JPS56158525 A JP S56158525A
Authority
JP
Japan
Prior art keywords
digital filter
random
signal
circuits
output
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
JP6250480A
Other languages
Japanese (ja)
Inventor
Toshihiko Mizukami
Kenji Nakayama
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 Corp
Original Assignee
NEC Corp
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 Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6250480A priority Critical patent/JPS56158525A/en
Publication of JPS56158525A publication Critical patent/JPS56158525A/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)
  • Complex Calculations (AREA)

Abstract

PURPOSE:To simplify the hardware remarkably, by providing a circuit in which at least one-bit signal out of internal signals to the least significant digit of an adder, to form a digital filter. CONSTITUTION:The output of multipliers 110-112 of a circulatlon type digital filter is provided with a round-off signal generators 410-412 for random round-off. The circuits 410-412 use the principle that the production of ''1'' or ''0'' appeared at each lower rank bit is almost at random and it is almost without correlation timewise, when a signal is in binary notation representation, and random numbers are produced from the signal itself. Further, the output of the circuits 410-412 is given as the carry signal input of the least significant digit of adders 115-117, where random emission of fractions and counting fractions as one are made equi- valently with the output of ''0'' and ''1'' of the circuits 410-412.
JP6250480A 1980-05-12 1980-05-12 Circulation type digital filter Pending JPS56158525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6250480A JPS56158525A (en) 1980-05-12 1980-05-12 Circulation type digital filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6250480A JPS56158525A (en) 1980-05-12 1980-05-12 Circulation type digital filter

Publications (1)

Publication Number Publication Date
JPS56158525A true JPS56158525A (en) 1981-12-07

Family

ID=13202060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6250480A Pending JPS56158525A (en) 1980-05-12 1980-05-12 Circulation type digital filter

Country Status (1)

Country Link
JP (1) JPS56158525A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS623517A (en) * 1985-06-28 1987-01-09 Matsushita Electric Ind Co Ltd Cyclic type digital filter
JPH02189018A (en) * 1989-01-18 1990-07-25 Matsushita Electric Ind Co Ltd Digital signal processor
EP0411504A2 (en) * 1989-07-29 1991-02-06 Sony Corporation Digital signal processing circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS623517A (en) * 1985-06-28 1987-01-09 Matsushita Electric Ind Co Ltd Cyclic type digital filter
JPH02189018A (en) * 1989-01-18 1990-07-25 Matsushita Electric Ind Co Ltd Digital signal processor
EP0411504A2 (en) * 1989-07-29 1991-02-06 Sony Corporation Digital signal processing circuit
EP0411504A3 (en) * 1989-07-29 1993-02-03 Sony Corporation Digital signal processing circuit

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