JPS56120212A - Digital filter of block floating decimal point - Google Patents

Digital filter of block floating decimal point

Info

Publication number
JPS56120212A
JPS56120212A JP2355580A JP2355580A JPS56120212A JP S56120212 A JPS56120212 A JP S56120212A JP 2355580 A JP2355580 A JP 2355580A JP 2355580 A JP2355580 A JP 2355580A JP S56120212 A JPS56120212 A JP S56120212A
Authority
JP
Japan
Prior art keywords
multipliers
comparator
gives
coefficient
digital filter
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
JP2355580A
Other languages
Japanese (ja)
Inventor
Takao Nishitani
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 JP2355580A priority Critical patent/JPS56120212A/en
Publication of JPS56120212A publication Critical patent/JPS56120212A/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

Abstract

PURPOSE:To reduce the momentary energy of round-off noise produced in a digital filter, by the operation while shifting the location of the decimal point according to the magnitude of energy of output or input signal. CONSTITUTION:A given greater value to some extent is input to a comparator 41 and a given smaller value is to a comparator 42. A coefficient generation circuit 43 gives 1/2, 2 to multipliers 11, 12 when the output of the comparator 41 is on respectively, and gives coefficient 1/2 to multipliers 13, 14 at one sampling time only. Normally, coefficient 1 is given to the multipliers 11, 12, 13, 14. On the contrary, the circuit 43 gives coefficients 2,1/2 to the multipliers 11, 12 respectively when the output of comparator 42 is on and gives coefficient 2 to the multipliers 13, 14 at one sampling time only.
JP2355580A 1980-02-27 1980-02-27 Digital filter of block floating decimal point Pending JPS56120212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2355580A JPS56120212A (en) 1980-02-27 1980-02-27 Digital filter of block floating decimal point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2355580A JPS56120212A (en) 1980-02-27 1980-02-27 Digital filter of block floating decimal point

Publications (1)

Publication Number Publication Date
JPS56120212A true JPS56120212A (en) 1981-09-21

Family

ID=12113740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2355580A Pending JPS56120212A (en) 1980-02-27 1980-02-27 Digital filter of block floating decimal point

Country Status (1)

Country Link
JP (1) JPS56120212A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0661792A (en) * 1992-07-27 1994-03-04 Sony Tektronix Corp Digital filter
WO2006100967A1 (en) * 2005-03-22 2006-09-28 Pioneer Corporation Digital filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0661792A (en) * 1992-07-27 1994-03-04 Sony Tektronix Corp Digital filter
WO2006100967A1 (en) * 2005-03-22 2006-09-28 Pioneer Corporation Digital filter

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