JPS55133144A - Estimation system for gain of communication line - Google Patents

Estimation system for gain of communication line

Info

Publication number
JPS55133144A
JPS55133144A JP4069379A JP4069379A JPS55133144A JP S55133144 A JPS55133144 A JP S55133144A JP 4069379 A JP4069379 A JP 4069379A JP 4069379 A JP4069379 A JP 4069379A JP S55133144 A JPS55133144 A JP S55133144A
Authority
JP
Japan
Prior art keywords
communication line
gain
frequency
filter
low pass
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
JP4069379A
Other languages
Japanese (ja)
Inventor
Kensaku Fujii
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 JP4069379A priority Critical patent/JPS55133144A/en
Publication of JPS55133144A publication Critical patent/JPS55133144A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To enable to replace the coefficient of the low pass filter used for the estimation of the gain of communication line, by monitoring the frequency distribution given to the variation of communication line gain through the spectral analyzer. CONSTITUTION:The information signal via the communication line is analyzed for the frequency component of the reception information signal at the spectral analyzer 1; The output value of the spectral analyzer 1 is compared at the comparator 2 in comparison with the frequency reference value, and the cut-off frequency of the low pass filter 4 is changed with the filter coefficient selector 3 when it exceeds the threshold value. The low pass filter 4 is variable filter having the upper limit frequency of the frequency component given with the communiction line gain variation, the cut off frequency in matching with the communication line gain variation component is determined with the signal from the filter coefficient selector and the gain of communication line is estimated. In the transmission signal repoduction circuit 5, the information signal with distortion received via the communication line and the estimated value of the gain of communication line of the output of the filter 4 reproduce the transmission signal without distortion before the communication line 2.
JP4069379A 1979-04-04 1979-04-04 Estimation system for gain of communication line Pending JPS55133144A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4069379A JPS55133144A (en) 1979-04-04 1979-04-04 Estimation system for gain of communication line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4069379A JPS55133144A (en) 1979-04-04 1979-04-04 Estimation system for gain of communication line

Publications (1)

Publication Number Publication Date
JPS55133144A true JPS55133144A (en) 1980-10-16

Family

ID=12587628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4069379A Pending JPS55133144A (en) 1979-04-04 1979-04-04 Estimation system for gain of communication line

Country Status (1)

Country Link
JP (1) JPS55133144A (en)

Similar Documents

Publication Publication Date Title
JPS51100774A (en)
ES8401694A1 (en) Improved selectivity means in amplitude modulated radio receivers.
EP0451277A4 (en) Automatic gain control circuit
CA2042950A1 (en) Automatic power control circuit for use with a radio telecommunication apparatus
FR2648661B1 (en) LOW FREQUENCY ALTERNATIVE SIGNAL DETECTOR IN PARTICULAR FOR TELEPHONE TRUNK
JPS55133144A (en) Estimation system for gain of communication line
CA2123847A1 (en) Low Frequency Discriminator Circuit
GB945861A (en) Improvements in or relating to frequency modulation receivers
JPS5742240A (en) Squeltch circuit
JPS57186843A (en) Tone squelch voice monitoring system
JPS5791039A (en) Fm receiver
SU1732478A1 (en) Device for monitoring of status of communication path
JPS52152104A (en) Multi-frequency signal receiver
JPS5772405A (en) Frequency demodulating circuit
JPS5664508A (en) Low-band compensating circuit
JPS542006A (en) Receiver
JPS55133142A (en) Estimation system for gain of communication line
JPS54152414A (en) Squelch system of fm mobile radio equipment
Al-Nuaimi Reduction of threshold noise in FM receivers operating in quasisynchronous field
JPS56168450A (en) Fault detecting system of fm radio receiver
JPS55100717A (en) Frequency split filter
JPS55161430A (en) Radio communicating system
SE0004481D0 (en) A method and a device for tuning a cavity channel filter combiner
JPS56156091A (en) Remote control method
JPS5723339A (en) Lincompex radio equipment