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公开(公告)号：EP0707391A3
公开(公告)日：1998-05-20
申请号：EP95113154
申请日：1995-08-22
Applicant: IBM
CPC classification number: H04B10/1143 , H04L25/4902 , H04L25/4904
Abstract: Biphase or FM encoding is combined with Flash modulation in infrared (IR) communication. By shrinking the coded pulse width in the modulation process, power dissipation is effectively reduced to the point where FM encoding can be advantageously adapted to IR communication in a synchronous communication system. Noise filtering is also described.
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公开(公告)号：HU216563B
公开(公告)日：1999-07-28
申请号：HU9700411
申请日：1995-09-15
Applicant: IBM
IPC: H04B10/10 , H04B10/118 , H04B10/22 , H04L27/00 , H04L29/06
Abstract: A directed infrared (IR) communication controller which supports interoperability among protocols and which can communicate at baud rates of up to 2.34 Mbps while supporting the IRDA standard as well as Sharp's 500 KHz ASK, NRZI, and Biphase modulated IR systems. A method for automatically determining which type of infrared signal is being received is also described.
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公开(公告)号：HUT76994A
公开(公告)日：1998-01-28
申请号：HU9700411
申请日：1995-09-15
Applicant: IBM
IPC: H04B10/10 , H04B10/118 , H04B10/22 , H04L27/00 , H04L29/06
Abstract: A directed infrared (IR) communication controller which supports interoperability among protocols and which can communicate at baud rates of up to 2.34 Mbps while supporting the IRDA standard as well as Sharp's 500 KHz ASK, NRZI, and Biphase modulated IR systems. A method for automatically determining which type of infrared signal is being received is also described.
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Patent Agency Ranking
公开(公告)号：HU76995A2
公开(公告)日：1998-01-28
申请号：HU9700409
申请日：1995-09-15
Applicant: IBM
Abstract: A modulation scheme and system, compatible with both the asynchronous IRDA mode and the synchronous mode of IR communication, involves Non-Return-to-Zero-Inverted (NRZI) and Flash pulse encoding in conjunction with zero-bit stuffing. A digital data stream has a zero-bit inserted therein, before NRZI format encoding, whenever five consecutive one's are detected in the stream to enable the controller to distinguish the data from flags, which are exempt from the zero-bit insertion, and to provide enough transitions in the data so that the demodulator's digital phase lock loop can stay locked independent of the data contents. A Flash pulse (of from +E,fra 3/16+EE to +E,fra 8/16+EE of bit cell width, depending on the data rate) is generated whenever a transition is detected in the NRZI formatted data. The result, in keeping with IRDA modulation, is that a Flash pulse is generated whenever a zero occurs in the data stream. On the demodulation side, whenever a Flash pulse is received, the level of the receive line is toggled resulting in an output in NRZI format. Using this modulation scheme with a serial controller which supports NRZI and bit-stuffing, a system may be constructed that uses the controller's phase lock loop to send and receive data synchronously.
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公开(公告)号：PL319162A1
公开(公告)日：1997-07-21
申请号：PL31916295
申请日：1995-09-15
Applicant: IBM
IPC: H04B10/10 , H04B10/118 , H04B10/22 , H04L27/00 , H04L29/06
Abstract: A directed infrared (IR) communication controller which supports interoperability among protocols and which can communicate at baud rates of up to 2.34 Mbps while supporting the IRDA standard as well as Sharp's 500 KHz ASK, NRZI, and Biphase modulated IR systems. A method for automatically determining which type of infrared signal is being received is also described.
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公开(公告)号：DE69532846T2
公开(公告)日：2005-05-19
申请号：DE69532846
申请日：1995-08-22
Applicant: IBM
Abstract: Biphase or FM encoding is combined with Flash modulation in infrared (IR) communication. By shrinking the coded pulse width in the modulation process, power dissipation is effectively reduced to the point where FM encoding can be advantageously adapted to IR communication in a synchronous communication system. Noise filtering is also described.
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公开(公告)号：DE69532846D1
公开(公告)日：2004-05-13
申请号：DE69532846
申请日：1995-08-22
Applicant: IBM
Abstract: Biphase or FM encoding is combined with Flash modulation in infrared (IR) communication. By shrinking the coded pulse width in the modulation process, power dissipation is effectively reduced to the point where FM encoding can be advantageously adapted to IR communication in a synchronous communication system. Noise filtering is also described.
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公开(公告)号：PL319125A1
公开(公告)日：1997-07-21
申请号：PL31912595
申请日：1995-09-15
Applicant: IBM
Abstract: A modulation scheme and system, compatible with both the asynchronous IRDA mode and the synchronous mode of IR communication, involves Non-Return-to-Zero-Inverted (NRZI) and Flash pulse encoding in conjunction with zero-bit stuffing. A digital data stream has a zero-bit inserted therein, before NRZI format encoding, whenever five consecutive one's are detected in the stream to enable the controller to distinguish the data from flags, which are exempt from the zero-bit insertion, and to provide enough transitions in the data so that the demodulator's digital phase lock loop can stay locked independent of the data contents. A Flash pulse (of from +E,fra 3/16+EE to +E,fra 8/16+EE of bit cell width, depending on the data rate) is generated whenever a transition is detected in the NRZI formatted data. The result, in keeping with IRDA modulation, is that a Flash pulse is generated whenever a zero occurs in the data stream. On the demodulation side, whenever a Flash pulse is received, the level of the receive line is toggled resulting in an output in NRZI format. Using this modulation scheme with a serial controller which supports NRZI and bit-stuffing, a system may be constructed that uses the controller's phase lock loop to send and receive data synchronously.
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