Lsi Corporation

Intel Corporation

Avago Technologies General IP (Singapore) Pte. Ltd.

Herbert B Cohen

Ximing Chen

Chengzhou Li

Jianqiang Xin

James K Flynn

A facsimile apparatus includes a user interface operative to facilitate communications between the apparatus and at least one user application in operative communication with the apparatus, a network interface operative to facilitate communications between the apparatus and an analog communications network and an IP communications network. The apparatus further includes a controller connected to the user interface and network interface. The controller is operative in a first mode to communicate with the analog communications network using a first facsimile protocol and being operative in at least a second mode to communicate with the IP communications network using the first facsimile protocol and a voice band data protocol.

Voice band data mode in a universal facsimile engine

A buffer memory is provided that comprises a plurality of memory elements for storing data elements in an order of arrival, wherein the plurality of memory elements have a variable size and wherein each memory element comprises a pointer (such as a next block starting index) to a memory element storing a next data element. Additionally, each memory element optionally further comprises a block size field indicating the variable size and/or a sequence number field indicating a sequence number of the corresponding data element. The buffer memory optionally comprises a largest sequence variable to store a sequence number of a data element in the buffer memory having a largest sequence number. The largest sequence variable is updated if a newly arrived data element has a sequence number that is larger than the largest sequence variable. A method is also provided for managing the disclosed buffer memories.

Methods and apparatus for linked-list circular buffer management

Described embodiments provide an IP-aware modem, such as for use in an IP-aware facsimile machine, operable with an IP packet network. The IP-aware modem has voice-band data engine that receives packets from the packet network, converts data in the packets to PCM samples, stores the samples as PCM sample frames in a buffer for further processing by the modem, and determines for each PCM sample frame whether or not during the conversion one or more packets were missing. An equalizer or timing recovery element in the modem adapts using the PCM sample frames and suspends the adaptation for the time period of each PCM sample frame converted without the one or more missing packets. Similarly, searches of the PCM sample frames for certain modem synchronization signals are skipped when, during the search, the searched PCM sample frame was converted without the one or more missing packets.

Modem adaptation control for facsimile over internet protocol

A method for correcting at least one error in a data transmission over a packet-based communication network includes the steps of: generating a sequence of data packets for transmission over the packet-based communication network, the sequence of data packets being arranged into a plurality of packet frames, each of at least a subset of the packet frames including at least a primary data packet and a number of redundant data packets which is a function of a prescribed redundancy pattern, the subset of packet frames having a non-uniform distribution of redundant data packets therein; transmitting the sequence of data packets over the communication network; and recovering at least one missing data packet in the sequence of data packets using at least one corresponding redundant data packet in at least one subsequently received packet frame when the missing data packet is identified in a receiver of the sequence of data packets.

Growing community of inventors

Allentown, PA, United States of America

Herbert B Cohen