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UIlltBd States Patent [19] [11] Patent Number: 5,434,913 Tung et a1. [45] Date of Patent: Jul. 18, 1995

[54] AUDIO SUBSYS'I'EM FOR COMPUTER-BASED CONFERENCING SYSTEM

OTHER PUBLICATIONS

Computer Conferencing: IBM scientists demo proto type of affordable computer conferencing system, Nov.

[75] Inventors: Peter Tung, Beaverton; Ben Vrvilo, 2’ 1992_ EDGE’ on & about AT&T’ V7, 11223’ p, 22_ Portland, both of Greg.

Primary Examiner—.larnes L. Dwyer [73] Assignee: Intel Corporation, Santa Clara, Calif. Assistant Examiner-Scott Wolinsky [21] A 1 N 158 246 Attorney, Agent, or Firm—-Steve Mendelsohn; William

pp . 0.: , H. Murray

[22] Filed: Nov. 24, 1993 [57] ABSTRACI‘

[51] Int. 01.6 ............................................ .. HD4M 3/56 An audi° task ,residing °n 3,11 audio/communicating [52] us. (:1. .................................. .. 379/202; 395/800; Pwd °f a“ “(11° ‘Subsystem “1 a COmPuF“ °°Y%fe“?“°'

395/162 ing system. An audio manager and an audio applications [58] Field of Search ______________ u 395/800’ 162; 379/202, programming interface reside on a host processor of: the

379/205 203 204 computer conferencing system. The audio task receives ’ ’ local analog audio signals, generates local compressed

[56] References Cited audio signals corresponding to the local analog audio U S PATENT DOCUMENTS signals, and passes the local compressed audio signals to

' ‘ ' a communications subsystem of the computer confer

4,475,l93 10/1984 Brown ....................... .. 379/202 encing system for transmission over a communications 4,333,795 12/1989 AndO e} 31 -- 379/53 link to a remote computer conferencing system. The 5,014,267 5/1991 Tompi‘ms ct a1‘ " """"" " 370/62 audio task receives remote compressed audio signals

snuzuktllet a1‘ """""""" from the communications subsystem and generates re 5Z231Z492 7/1993 Dangig:al:":::............12: 358/143 mote decompress“ audio Signals correspmding to the 5,315,633 5/1994 remote compressed audio signal for local playback. 5,319,793 6/1994 5,335,321 8/1994 16 Claims, 32 Drawing Sheets

102 102 104

CANERA MICROPHONE CANERA MICROPHONE

ANALOG ANALOG ANALOG ANALOG

VIDEO AUDIO VIDEO AUDIO

V V V V

100 ' 100 1 CONFERENCING ISDN NETWORK CONFERENCING f

SYSTEN SYSTEN

A (DIGITAL) B

1 1 0

ANALOG ANALOG ANALOG ANALOG

VIDEO AUDIO VIDEO AUDIO

V l l V

KINITOR SPEAKER NONITOR SPEAKER

106 108 106 108

CISCO SYSTEMS, INC. Ex. 1031 Page 1

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US. Patent July 18, 1995 Sheet 2 of 32 5,434,913

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U.S. Patent July 18, 1995 Sheet 3 of 32 5,434,913

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US. Patent July 18, 1995 Sheet 5 of 32 Y 5,434,913

F IG . 5 .

100

502 AUDIO/VIDEO DATA CONFERENCING 5 04 CONFERENCING APPN APPLICATION

506'\ CONFERENCING API

5 10 I‘ 5 1 Z 5 1 4

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‘1 VIDEO CAPTURE NAvE DRIVER DRIVER

5 26, HOST INTERFACE DSP INTERFACE

5 28 530\_ VIDEO BOARD DSP I532

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5 36 5 34 % H

AUDIO HOST DEVICE NAME

5 3 8 f TASK DRIVER TASK

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CISCO SYSTEMS, INC. Ex. 1031 Page 6

US. Patent July 18, 1995 Sheet 6 of 32 5,434,913

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CISCO SYSTEMS, INC. Ex. 1031 Page 7

CISCO SYSTEMS, INC. Ex. 1031 Page 8

CISCO SYSTEMS, INC. Ex. 1031 Page 9

US. Patent July 18, 1995 Sheet 9 of 32 5,434,913

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CISCO SYSTEMS, INC. Ex. 1031 Page 10

US. Patent July 18, 1995 Sheet 10 of 32 5,434,913

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US. Patent July 18, 1995 Sheet 11 of 32 5,434,913

F IG . 1 1 .

5 1 6

1 102

VIDEO MANAGER 1 108 LIBRARY

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PLAYBACK (CODEC)

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CISCO SYSTEMS, INC. Ex. 1031 Page 12

U.S. Patent July 18, 1995 Sheet 12 of 32 5,434,913

FIG. 12. I1]

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US. Patent July 18, 1995 Sheet 17 of 32 5,434,913

F IG . 17 .

UPPER LAYERS

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532 ‘\- DSP INTERFACE

comm (0 cm) 0m com TASKS

mum/com BOARD (Sm) :1 cm DRIVER s CHAN DRIVERS

206

CISCO SYSTEMS, INC. Ex. 1031 Page 18

CISCO SYSTEMS, INC. Ex. 1031 Page 19

US. Patent July 18, 1995 Sheet 19 0f 32 5,434,913

END sass/01v BEG 1N SESSION

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FIG. 19 CISCO SYSTEMS, INC. Ex. 1031 Page 20

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