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JPS6424519A - Echo signal removing device - Google Patents

Echo signal removing device

Info

Publication number
JPS6424519A
JPS6424519A JP18189687A JP18189687A JPS6424519A JP S6424519 A JPS6424519 A JP S6424519A JP 18189687 A JP18189687 A JP 18189687A JP 18189687 A JP18189687 A JP 18189687A JP S6424519 A JPS6424519 A JP S6424519A
Authority
JP
Japan
Prior art keywords
signal
removing means
sampling
adds
outputs
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
JP18189687A
Other languages
Japanese (ja)
Inventor
Fujio Nakagawa
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
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 filed Critical NEC Corp
Priority to JP18189687A priority Critical patent/JPS6424519A/en
Priority to DE8888111605T priority patent/DE3874997T2/en
Priority to EP88111605A priority patent/EP0300427B1/en
Priority to AU19222/88A priority patent/AU604137B2/en
Priority to CA000572498A priority patent/CA1317354C/en
Priority to US07/221,968 priority patent/US4972467A/en
Publication of JPS6424519A publication Critical patent/JPS6424519A/en
Pending legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To compensate a deviation in sampling value due to a sampling time difference by providing a filter which inputs a sent signal and a sampling timing signal and outputs a removal signal and a means which adds the output of an adder and the removal signal and outputs a received signal. CONSTITUTION:The two-tap transversal filter 1 as a 1st removing means which outputs the removal signal 60 and the adder 300 which adds the removal signal 60 and received signal 40 are provided. The 1st removing means 1 generates the removal signal 60 for removing the output of a sampling circuit 500 for an echo signal at all times and adds it to the output of a sampling circuit 500. When the sampling time of the echo signal deviates from only equal-interval time, a 2nd removing means 2 removes its variation and a means which performs control adds the tap coefficient of the 2nd removing means 2 to the tap coefficient value of the 1st removing means 1 to stop the operation of the 2nd removing means 2. Consequently, the deviation in the sampling value can be compensated.
JP18189687A 1987-07-20 1987-07-20 Echo signal removing device Pending JPS6424519A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP18189687A JPS6424519A (en) 1987-07-20 1987-07-20 Echo signal removing device
DE8888111605T DE3874997T2 (en) 1987-07-20 1988-07-19 Echo compensator.
EP88111605A EP0300427B1 (en) 1987-07-20 1988-07-19 Echo canceller
AU19222/88A AU604137B2 (en) 1987-07-20 1988-07-19 Echo canceller
CA000572498A CA1317354C (en) 1987-07-20 1988-07-20 Echo canceller
US07/221,968 US4972467A (en) 1987-07-20 1988-07-20 Echo canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18189687A JPS6424519A (en) 1987-07-20 1987-07-20 Echo signal removing device

Publications (1)

Publication Number Publication Date
JPS6424519A true JPS6424519A (en) 1989-01-26

Family

ID=16108779

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18189687A Pending JPS6424519A (en) 1987-07-20 1987-07-20 Echo signal removing device

Country Status (1)

Country Link
JP (1) JPS6424519A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256833A (en) * 1985-01-29 1986-11-14 ブリテイシユ・テレコミユニケ−シヨンズ・パブリツク・リミテツド・カンパニ Noise cancellation method and apparatus and full duplex modem

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256833A (en) * 1985-01-29 1986-11-14 ブリテイシユ・テレコミユニケ−シヨンズ・パブリツク・リミテツド・カンパニ Noise cancellation method and apparatus and full duplex modem

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