公开(公告)号：US07054379B2

公开(公告)日：2006-05-30

申请号：US09906410

申请日：2001-07-16

Applicant: Arthur J. Carlson ,  Haixiang Liang

Inventor： Arthur J. Carlson ,  Haixiang Liang

IPC: H04L27/04 ,  H04K1/00

CPC classification number: H04L25/03828

Abstract: In a data communication system, a transmitter of a modem, for example, uses a single scrambler to operate in a data communication mode and in a non-data mode. During the data communication mode the scrambler is used to scramble data for communication by the transmitter. During the non-data mode, the scrambler is used to generate a non-data mode signal for communication by the scrambler. The modem may be an ADSL modem, for example, in which case the data communication mode is SHOWTIME while the non-data mode may be Q-mode.

公开(公告)号：US06907062B2

公开(公告)日：2005-06-14

申请号：US09923497

申请日：2001-08-06

Applicant: Arthur J. Carlson

Inventor： Arthur J. Carlson

IPC: H04B1/38 ,  H04L1/24 ,  H04L5/14 ,  H04L12/26 ,  H04L12/66 ,  H04L27/26 ,  H04M11/00

CPC classification number: H04L12/66

Abstract: The present invention relates to a system and method for selecting one of plurality of PRBS generators for use with a modem. The modem includes a measuring device adapted to measure an operating environment of the modem; and a storage device adapted to store a list of PRBS generator definitions. The modem selects one of a plurality of PRBS generators based on the measurement of the operating environment.

公开(公告)号：US4481622A

公开(公告)日：1984-11-06

申请号：US364320

申请日：1982-04-01

Applicant: King Y. Cheng ,  Arthur J. Carlson

Inventor： King Y. Cheng ,  Arthur J. Carlson

IPC: H04M11/06 ,  H04B3/23 ,  H04L5/06 ,  H04L5/14 ,  H04B1/50

CPC classification number: H04L5/06 ,  H04B3/23 ,  H04L5/143 ,  H04B3/235

Abstract: A 4800 bit-per-second full duplex modem is described which utilizes the full bandwidth of ordinarily available dial-up telephone circuits for transmission of data in both directions in different pass-band portions thereof. The two pass-bands overlap in about the middle of the telephone band in order to fully utilize that bandwidth for high speed data transmission. The overlap is less than that which will cause a greater error rate than desired from remote echos of transmitted data. Local echos, which are much stronger, resulting from the overlap bandwidth portion are cancelled by an echo cancelling technique. Local echo cancelling is accomplished at the baud rate, generated in each modem, for substraction from a received signal; a cancellation signal is generated from a time varying system that depends upon the modulating and demodulating carrier signals.

Abstract translation: 描述了每秒4800比特的全双工调制解调器，其利用通常可用的拨号电话电路的全带宽来在其不同通带部分中的两个方向上的数据传输。 两个通带在电话频段的中间重叠，以便充分利用该带宽进行高速数据传输。 重叠小于比传输数据的远程回波更大的误差率。 由重叠带宽部分导致的强大的本地回波由回波消除技术消除。 本地回波消除是以每个调制解调器产生的波特率来实现的，用于从接收信号中减去; 从取决于调制和解调载波信号的时变系统产生消除信号。