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公开(公告)号：US3632876A
公开(公告)日：1972-01-04
申请号：US3632876D
申请日：1969-10-16
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M
CPC classification number: H04L27/24
Abstract: A sequence of binary data bits are transformed into a waveform consisting of a series of half-cycles of square waves of two different frequencies, the half-cycles being of alternating phase and each frequency corresponding to one of the two binary conditions. This sequence of half-cycle square waves then may be transmitted as a stream of exact half-cycles of audio tones.
Abstract translation: 一系列二进制数据位被转换为由两个不同频率的一系列半波形的半波形组成的波形，半周期是交替相位，每个频率对应于两个二进制条件之一。 然后可以将这个半周期方波序列作为音频音调的精确半周期流传输。
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公开(公告)号：US3623075A
公开(公告)日：1971-11-23
申请号：US3623075D
申请日：1969-10-16
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M , ROLLINS THOMAS J
Abstract: Digital information to be decoded is transmitted over a voice band transmission medium as a sequence of half-cycles of tone of different frequencies, with different frequency tones being utilized for mark and space data bits. Only a half-cycle is required for each data bit with a phase reversal occurring at each data bit. The incoming signals are transformed into a sequence of zero crossings with the pulse interval time duration between these zero crossings being compared with a local frequency standard. At the end of each pulse interval, the decision of whether or not a mark or space has been received is determined in accordance with the count stored in a counter driven by the local frequency standard. The counter then is reset, storing a new count during the next half-cycle signal received.
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公开(公告)号：CA1130865A
公开(公告)日：1982-08-31
申请号：CA312978
申请日：1978-10-10
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M , DIRKES WILLIAM R , JOGLEKAR MANOHAR A , SECORA JAMES C , STEPIEN MICHAEL A
Abstract: CM-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks havè N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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Patent Agency Ranking
公开(公告)号：CA1128133A
公开(公告)日：1982-07-20
申请号：CA382192
申请日：1981-07-21
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M , DIRKES WILLIAM R , JOGLEKAR MANOHAR A , SECORA JAMES C , STEPIEN MICHAEL A
Abstract: ?M-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks have N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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公开(公告)号：CA892797A
公开(公告)日：1972-02-08
申请号：CA892797D
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M
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公开(公告)号：CA1128665A
公开(公告)日：1982-07-27
申请号：CA382193
申请日：1981-07-21
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M
IPC: H04L1/10
Abstract: CM-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks have N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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公开(公告)号：CA1128626A
公开(公告)日：1982-07-27
申请号：CA382194
申请日：1981-07-21
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M
IPC: H03L7/06
Abstract: CM-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks have N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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公开(公告)号：CA892796A
公开(公告)日：1972-02-08
申请号：CA892796D
Applicant: MOTOROLA INC
Inventor： ROLLINS THOMAS J , BENCH STEPHEN M
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