公开(公告)号：JPH1022916A

公开(公告)日：1998-01-23

申请号：JP6758697

申请日：1997-03-21

Applicant: LUCENT TECHNOLOGIES INC

Inventor： OTA YUSUKE ,  SWARTZ ROBERT GERALD

IPC: H04N7/22 ,  H04B10/00 ,  H04B10/02 ,  H04B10/158 ,  H04J14/00 ,  H04J14/02

Abstract: PROBLEM TO BE SOLVED: To remove interference by means of the low frequency component of a video signal in the reception of a digital signal with simple constitution by controlling the voltage control current source of a burst mode receiver having non-linear dc cancel performance in a video passive light network. SOLUTION: When input light current Iin contains low frequency current I0 in the receiver 250, the levels of + and - become asymmetrical and the difference Δ of peaks becomes the output of the buffer B. The voltage control current source Cs is controlled by a signal supplied to a low-pass filter LPFB2 and is filtered. Then, the low frequency component Io is canceled from input light current Iin . Only the current Id of the digital signal is supplied to an amplifier A3 and a video signal component can be removed and interference by the video signal can be removed.

公开(公告)号：CA2196239C

公开(公告)日：2002-09-10

申请号：CA2196239

申请日：1997-01-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： OTA YUSUKE ,  SWARTZ ROBERT GERALD

IPC: H04N7/22 ,  H04B10/00 ,  H04B10/02 ,  H04B10/158 ,  H04J14/00 ,  H04J14/02 ,  H04B10/18

Abstract: In a system where a second signal interferes with the detection of a first signal at an input, in which the second signal is composed of a low frequenc y component and a portion of the frequency spectrum that is higher than that o f the first signal, then both signals are processed to eliminate such interfer enceby filtering the second signal to eliminate the port ion of the frequency spectrum that is higher than that of the first signal and eliminate the low frequency component of the second signal. Advantageously, such processing is done without affecting any low frequency component of the first signal.

公开(公告)号：CA2196239A1

公开(公告)日：1997-09-23

申请号：CA2196239

申请日：1997-01-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： OTA YUSUKE ,  SWARTZ ROBERT GERALD

IPC: H04N7/22 ,  H04B10/00 ,  H04B10/02 ,  H04B10/158 ,  H04J14/00 ,  H04J14/02 ,  H04B10/18

Abstract: In a system where a second signal interferes with the detection of a first signal at an input, in which the second signal is composed of a low frequency component and a portion of the frequency spectrum that is higher than that of the first signal, then both signals are processed to eliminate such interferenceby filtering the second signal to eliminate the portion of the frequency spectrum that is higher than that of the first signal and eliminate the low frequency component of the second signal. Advantageously, such processing is done without affecting any low frequency component of the first signal.