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US5519641A
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Method and apparatus for configuring plural multimedia audio cards as a local area network
Assignee: International Business Machines Corp
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Filing: 1994-05-20
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Granted: 1996-05-21
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Expires: 2014-05-20
Abstract
Abstract A system and method makes use of the line-in, line-out connectors for each right and left stereo channel of an audio card to provide a communications network. The distributed computers are connected in a master/slave configuration. All of the slave systems have the line-in ports, and the line-out ports, connected together. The master system line-out is connected to each slave system line-in port, and the slave system line-out ports are connected to the master line-in port, for each channel. A communications protocol is provided wherein the master system allows audio and data information to be simultaneously transferred between the master and slave systems. The master provides a clock signal and performs arbitration in order to facilitate the information transfer.
Inventors
- 👤 Gregory E. Beers
- 👤 James A. Brewer
- 👤 Paul R. Habermehl
- 👤 James M. Stafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:27
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/403; H04L12/02; H04L12/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A computer network including a master system having a first audio card and multiple slave systems each having substantially identical second audio cards, comprising: means for commonly interconnecting first and second substantially identical analog format audio channels on said first audio card with respective first and second substantially identical analog format audio channels of said second audio cards in the multiple slave systems; communication means for controlling the transfer of audio and data information between said master system and said slave systems using said first audio channel to communicate control information and said second audio channel to communicate said audio and data information; and means for simultaneously processing said audio and data information in said first and second audio cards.
Claim 2
Dependent Claim
120 words
A computer network including a master system having a first audio card and multiple slave systems each having substantially identical second audio cards, comprising: means for commonly interconnecting first and second substantially identical analog format audio channels on said first audio card with respective first and second substantially identical analog format audio channels of said second audio cards in the multiple slave systems; communication means for controlling the transfer of audio and data information between said master system and said slave systems using said first audio channel to communicate control information and said second audio channel to communicate said audio and data information; and means for simultaneously processing said audio and data information in said first and second audio cards.
Claim 3
Dependent Claim
26 words
A system according to claim 1 wherein said communication means comprises means, within said master system for outputting a clock signal to said multiple slave systems.
Claim 4
Dependent Claim
46 words
A system according to claim 2 wherein said communication means further comprises: means, within said slave systems, for receiving said clock signal from said master system; and means, within said slave systems, for outputting said clock signal to said master to maintain a steady state condition.
Claim 5
Dependent Claim
34 words
A system according to claim 3 wherein said communication means further comprises means, within said slave systems, for withholding the output of said clock signal to said master to request access to said network.
Claim 6
Dependent Claim
45 words
A system according to claim 4 wherein said communication means further comprises: means, within said master for determining which of said slave systems has requested access to said network; and means, within said master for granting access to said network to the requesting slave system.
Claim 7
Dependent Claim
33 words
A system according to claim 5 wherein said communication means further comprises means, within said requesting slave system for transferring data to either said master system or another one of said slave systems.
Claim 8
Dependent Claim
24 words
A system according to claim 6 wherein said communication means further comprises means, within said master for transferring data to said requesting slave system.
Claim 9
Dependent Claim
43 words
A system according to claim 7 wherein said communication means further comprises: means, within said master, for revoking access to said network by said requesting slave system; and means for granting access to another of said slave systems requesting access to said network.
Claim 10
Dependent Claim
25 words
A system according to claim 8 wherein said means for simultaneously processing comprises a multitasking central processing system included on each of said audio cards.
Claim 11
Independent Claim
124 words
A method of communicating audio information and data information between a master computer system having a first audio card and multiple slave computer systems each having substantially identical second audio cards, comprising the steps of: commonly interconnecting first and second substantially identical analog format audio channels on said first audio card with respective first and second substantially identical analog format audio channels of said second audio cards in the multiple slave systems; controlling the transfer of audio and data information between said master system and said slave systems using said first audio channel to communicate control information and said second audio channel to communicate said audio and data information; and simultaneously processing said audio and data information in said first and second audio cards.
Claim 12
Independent Claim
124 words
A method of communicating audio information and data information between a master computer system having a first audio card and multiple slave computer systems each having substantially identical second audio cards, comprising the steps of: commonly interconnecting first and second substantially identical analog format audio channels on said first audio card with respective first and second substantially identical analog format audio channels of said second audio cards in the multiple slave systems; controlling the transfer of audio and data information between said master system and said slave systems using said first audio channel to communicate control information and said second audio channel to communicate said audio and data information; and simultaneously processing said audio and data information in said first and second audio cards.
Claim 13
Dependent Claim
28 words
A method according to claim 10 wherein said step of controlling comprises the step of outputting, by said master system, a clock signal to said multiple slave systems.
Claim 14
Dependent Claim
46 words
A method according to claim 11, wherein said step of controlling further comprises the steps of: receiving, by said slave systems, said clock signal from said master system; and outputting, by said slave systems, said clock signal to said master to maintain a steady state condition.
Claim 15
Dependent Claim
35 words
A method according to claim 12 said step of controlling further comprises the step of withholding, by said slave systems, the output of said clock signal to said master to request access to said network.
Claim 16
Dependent Claim
45 words
A method according to claim 13 wherein said step of controlling further comprises the steps of: determining, by said master, which of said slave systems has requested access to said network; and granting, by said master, access to said network to the resting slave system.
Claim 17
Dependent Claim
35 words
A method according to claim 14 wherein said step of controlling further comprises the step of transferring, by said requesting slave system, data to either said master system or another one of said slave systems.
Claim 18
Dependent Claim
26 words
A method according to claim 15 (wherein said step of controlling further comprises the step of transferring, by said master, data to said requesting slave system.
Claim 19
Dependent Claim
43 words
A method according to claim 16 wherein said step of controlling further comprises the steps of: revoking, by said master, access to said network by said requesting slave system; and granting access to another of said slave systems requesting access to said network.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |