JPS6424520A - Echo signal removing device - Google Patents

Echo signal removing device

Info

Publication number
JPS6424520A
JPS6424520A JP18189787A JP18189787A JPS6424520A JP S6424520 A JPS6424520 A JP S6424520A JP 18189787 A JP18189787 A JP 18189787A JP 18189787 A JP18189787 A JP 18189787A JP S6424520 A JPS6424520 A JP S6424520A
Authority
JP
Japan
Prior art keywords
removing means
deviation
echo signal
sampling
tap coefficient
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
JP18189787A
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 JP18189787A priority Critical patent/JPS6424520A/en
Publication of JPS6424520A publication Critical patent/JPS6424520A/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 time deviation according to how many times sampling time deviates by providing a 1st and a 2nd removing means and correcting the tap coefficient value of the 2nd removing means according to the removal result of the 2nd removing means. CONSTITUTION:The 1st removing means 1 generates a 1st 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 the sampling circuit 500. The tap coefficient value is corrected adaptively by a means which corrects the deviation in the sampling time of the echo signal by the 2nd removing means 2 when the sampling time deviates from equal-interval time to remove the variation and a means which performs control adds the tap coefficient value of the 2nd removing means 2 to the tap coefficient value of the 1st removing means to stop the operation of the 2nd removing means 2. Consequently, the deviation in sample value due to the deviation in sampling time can be compensated and the echo signal can be removed irrelevantly to how many times the sampling time deviates.
JP18189787A 1987-07-20 1987-07-20 Echo signal removing device Pending JPS6424520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18189787A JPS6424520A (en) 1987-07-20 1987-07-20 Echo signal removing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18189787A JPS6424520A (en) 1987-07-20 1987-07-20 Echo signal removing device

Publications (1)

Publication Number Publication Date
JPS6424520A true JPS6424520A (en) 1989-01-26

Family

ID=16108796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18189787A Pending JPS6424520A (en) 1987-07-20 1987-07-20 Echo signal removing device

Country Status (1)

Country Link
JP (1) JPS6424520A (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 cancelling method and apparatus and total dual 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 cancelling method and apparatus and total dual modem

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