公开(公告)号：US20040163120A1

公开(公告)日：2004-08-19

申请号：US10780362

申请日：2004-02-17

Applicant: Broadcom Corporation

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR. ,  Thomas J. Quigley ,  Lisa V. Denney ,  Jonathan S. Min ,  Christopher R. Jones ,  Henry Samueli ,  Fang Lu ,  Feng Chen ,  Sean F. Nazareth

IPC: H04N007/173 ,  H04L012/50 ,  H04Q011/00 ,  H04L012/66 ,  G01R031/08 ,  G08C015/00 ,  H04L012/26 ,  G06F011/00 ,  H04J003/14 ,  H04J001/16 ,  H04L001/00

CPC classification number: H04L12/2801 ,  H04J3/0655 ,  H04L1/0003

Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.

公开(公告)号：US20040252678A1

公开(公告)日：2004-12-16

申请号：US10879558

申请日：2004-06-29

Applicant: BROADCOM CORPORATION

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR.

IPC: H04L012/66

CPC classification number: H04L12/66 ,  H04L12/2801

Abstract: A method of processing sampled voice packets from a voice packet sender for transmission over a bit-rate sampled data transmission system, such as by a cable modem over a cable modem termination system, to a voice packet recipient. Unsolicited grant arrivals in response to a request from the voice packet sender coupled to the cable modem are determined. The storing of sampled voice packets is synchronized with the unsolicited grant arrivals. Upon receipt of an unsolicited grant arrival, currently stored sampled voice packets are transmitted to the cable modem for further transmission to the voice packet recipient over the cable modem termination system. The synchronization includes determining time needed between adjacent unsolicited grant arrivals for storing the sampled voice packets and for processing stored sampled voice packets, sampling voice packets by clocking voice packet sampling using a clock derived from a cable modem clock, and scheduling processing of the stored sample voice packets to be ready for transmission at a next unsolicited grant arrival. The time needed determination involves counting time between unsolicited grant arrivals and upon reaching a count indicative of the interval between unsolicited grant arrivals, providing for transmission of the currently stored sampled voice packets at the next unsolicited grant arrival.

公开(公告)号：US20020018463A1

公开(公告)日：2002-02-14

申请号：US09874127

申请日：2001-06-06

Applicant: Broadcom Corporation

Inventor： Theodore F. Rabenko

IPC: H04L012/66

CPC classification number: H04M7/006 ,  H04L12/2854 ,  H04L29/06 ,  H04L29/06027 ,  H04L49/90 ,  H04L49/9094 ,  H04L65/80

Abstract: A telephony system and method is provided that reduces delay and provides better utilization of upstream bandwidth in delivering packet telephony services to a plurality of subscriber lines via a cable modem system. An exemplary system includes a plurality of voice processing modules, a host processor, and a buffer. Each voice processing module receives digital voice signals from a separate set of subscriber lines, compresses the digital voice signals to generate a voice packet, and transfers the voice packet to the buffer. The host processor then assembles a packet by concatenating the voice packets and transmits the assembled packet for delivery over a data network. Because the plurality of voice processing modules process the voice packets in parallel, delay is reduced in the assembly and transmission of the assembled packet.

Abstract translation: 提供了一种电话系统和方法，其减少延迟并且通过电缆调制解调器系统提供对多个用户线路的分组电话服务的上行带宽的更好利用。 示例性系统包括多个语音处理模块，主机处理器和缓冲器。 每个语音处理模块从一组单独的用户线路接收数字语音信号，压缩数字语音信号以产生语音分组，并将该语音分组传送到缓冲器。 然后，主处理器通过连接语音分组来组合分组，并发送组合的分组以通过数据网络传送。 由于多个语音处理模块并行处理语音分组，所以组装的分组的组合和发送中的延迟减少。