JPS647809A - Digital filter - Google Patents

Digital filter

Info

Publication number
JPS647809A
JPS647809A JP16337387A JP16337387A JPS647809A JP S647809 A JPS647809 A JP S647809A JP 16337387 A JP16337387 A JP 16337387A JP 16337387 A JP16337387 A JP 16337387A JP S647809 A JPS647809 A JP S647809A
Authority
JP
Japan
Prior art keywords
tap
prom
input signal
multiplication
result
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
JP16337387A
Other languages
Japanese (ja)
Inventor
Takayuki Ushiyama
Atsushi Yamashita
Yoshiharu Tozawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16337387A priority Critical patent/JPS647809A/en
Publication of JPS647809A publication Critical patent/JPS647809A/en
Pending legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To eliminate the need of a multiplier, and also, to reduce the power consumption by storing in advance a result of multiplication of an input signal and a tap coefficient in a PROM, and executing a calculation of a digital filter by using its value. CONSTITUTION:The address of a PROM 6 is determined by an input signal outputted from a RAM 4 and a tap number. In the PROM 6, on the address determined by the tap number corresponding to some tap coefficient and the input signal, a result of multiplication of its tap coefficient and the input signal is stored. When the address corresponding to the tap number in a delay element string is added, the RAM 4 generates a tap output which has an input sampling signal delayed in accordance with the tap number. The PROM 6 outputs a result of multiplication of the input signal and the tap coefficient by adding the output of the RAM 4 and the tap number as the address. An adder 3 obtains a desired digital filter output by cumulating the output of the result of multiplication of the PROM 6. In such a way, a multiplier is made unnecessary.
JP16337387A 1987-06-30 1987-06-30 Digital filter Pending JPS647809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16337387A JPS647809A (en) 1987-06-30 1987-06-30 Digital filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16337387A JPS647809A (en) 1987-06-30 1987-06-30 Digital filter

Publications (1)

Publication Number Publication Date
JPS647809A true JPS647809A (en) 1989-01-11

Family

ID=15772647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16337387A Pending JPS647809A (en) 1987-06-30 1987-06-30 Digital filter

Country Status (1)

Country Link
JP (1) JPS647809A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0438005A (en) * 1990-06-04 1992-02-07 Nec Corp Digital signal processing circuit
JPH0556206U (en) * 1991-12-26 1993-07-27 朝日マリンファミリー株式会社 Filtration tank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0438005A (en) * 1990-06-04 1992-02-07 Nec Corp Digital signal processing circuit
JPH0556206U (en) * 1991-12-26 1993-07-27 朝日マリンファミリー株式会社 Filtration tank

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