[특허]Continous presence video signal combiner

[미국특허] Continous presence video signal combiner 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-001/42 H04N-007/14
출원번호	US-0234802 (1994-04-28)
발명자 / 주소	Chen Ting-Chung (Middletown Township NJ) Lei Shaw-Min (Boro of Tinton Falls NJ) Sun Ming-Ting (Holmdel Township all of Monmouth County NJ)
출원인 / 주소	Bell Communications Research, Inc. (Livingston NJ 02)
인용정보	피인용 횟수 : 61 인용 특허 : 0

초록 ▼

Four QCIF video input signals generated by participants in a multiparty video conference are combined in the coded domain to produce a merged CIF video output signal. When the CIF video output signal is transmitted back to each party\s video terminal, a combined 2×2 image is displayed. A video signal combiner (700) combines the input video signals in the coded domain by time-division multiplexing the inputs at the GOB level. In order to maintain frame synchronization between the inputs which may be arriving at different frame repetition rates, the combiner stores the inputs in buffers (706-709) and processes (710) the temporal reference (TR) numbers associated with each frame in each input before merging the GOBs from each input in accordance with the processed TR number. Specifically, the TR of each input is offset by an initial TR number associated with each input and determined at turn-on. The offset TR in each input is then mapped onto a scale of TR numbers that is common to each input. The each output frame is formed by time-division multiplexing GOBs from the inputs that have the same offset and mapped TR number. Only GOB headers and empty data fields are inserted into the combined data stream for those inputs not having a frame with that same mapped TR number.

대표청구항 ▼

A method of combining segments of plural input signals having temporal reference numbers associated with each segment into an output signal having segments and associated temporal reference numbers, comprising the steps of: (a) offsetting the temporal reference number of each segment in each input signal by an initial number associated with each input signal; (b) mapping the offset temporal reference number of each segment in each input signal onto a scale of temporal reference numbers having selected predetermined possible temporal reference numbers that are common to all the input signals; (c) combining segments from the input signals that have a same mapped temporal reference number into a segment of the output signal, the segment of the output signal having its associated temporal reference number determined from the same mapped temporal reference number of the segments of the input signals that are combined; and (d) repeating step (c) a plurality of times to form sequential segments of the output signal by combining segments of the input signals for the possible temporal reference numbers.

이 특허를 인용한 특허 (61) 인용/피인용 타임라인 분석

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[미국특허] Continous presence video signal combiner 원문보기

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