US3747074A — Method of and apparatus for baud rate detection

Claim 1

Independent Claim 188 words

A communication system for coordinating communications between a processor and a plurality of terminal devices wherein the baud rates of transmitting a communication in the system are defined by a set of baud-rate-codes, each baud rate corresponding to a unique baud-rate-code and each of which baud-rate-coder is at least one interval of time and is represented in a transmission of a communication as the interval between a pair of signal state transitions, comprising: A. monitoring means for detecting signal state transitions representative of a baud-rate-code; B. timing means for providing an indication of time; C. recording means responsive concurrent with said monitoring means detecting a said transition to record a said indication of time as a transition time; D. arithmetic means for computing the transition interval between a pair of said transition times, for correlating a said computed transition interval with a baud-rate-code time interval to identify a correlated baud-rate-code, and for indicating the baud rate corresponding to said correlated baudrate-code; and E. baud rate decoding control means responsive to said indicated buad rate to condition a communication device to decode the communication at the indicated baud rate.

Claim 2

Dependent Claim 188 words

A communication system for coordinating communications between a processor and a plurality of terminal devices wherein the baud rates of transmitting a communication in the system are defined by a set of baud-rate-codes, each baud rate corresponding to a unique baud-rate-code and each of which baud-rate-coder is at least one interval of time and is represented in a transmission of a communication as the interval between a pair of signal state transitions, comprising: A. monitoring means for detecting signal state transitions representative of a baud-rate-code; B. timing means for providing an indication of time; C. recording means responsive concurrent with said monitoring means detecting a said transition to record a said indication of time as a transition time; D. arithmetic means for computing the transition interval between a pair of said transition times, for correlating a said computed transition interval with a baud-rate-code time interval to identify a correlated baud-rate-code, and for indicating the baud rate corresponding to said correlated baudrate-code; and E. baud rate decoding control means responsive to said indicated buad rate to condition a communication device to decode the communication at the indicated baud rate.

Claim 3

Dependent Claim 12 words

detecting a signal state transition of a signal representative of a baud-rate-code;

Claim 4

Dependent Claim 12 words

detecting a signal state transition of a signal representative of a baud-rate-code;

Claim 5

Dependent Claim 46 words

a data register the inputs of which are coupled to outputs of said ring counter and which data register inputs are controlled in accordance with said transition detection logic output indicative of a transition to be enabled and to receive the count of said ring counter.

Claim 6

Dependent Claim 46 words

a data register the inputs of which are coupled to outputs of said ring counter and which data register inputs are controlled in accordance with said transition detection logic output indicative of a transition to be enabled and to receive the count of said ring counter.

Claim 7

Dependent Claim 24 words

old-state signal means for providing a representation of the signal state of said received signal a predetermined period after it has been received; and

Claim 8

Dependent Claim 24 words

old-state signal means for providing a representation of the signal state of said received signal a predetermined period after it has been received; and

Claim 9

Dependent Claim 12 words

A communication system according to claim 1 wherein said monitoring means comprises:

Claim 10

Dependent Claim 76 words

A communication system according to claim 2 wherein said transition detection logic comprises an exclusive OR gate which has said old-state and new-state signals as its inputs whereby whenever the signal states of the old-state and new-state signals are the same said exclusive OR gate is inactive but whenever the signal states of the old-state and new-state signals differ, the OR gate is active to provide an output signal indicative of the occurrence of a transition.

Claim 11

Dependent Claim 35 words

transition detection logic coupled to receive both the new-state and the old-state signals for providing an output indicative of the occurrence of a transition whenever the signal states of the old-state and new-state signals differ.

Claim 12

Dependent Claim 35 words

transition detection logic coupled to receive both the new-state and the old-state signals for providing an output indicative of the occurrence of a transition whenever the signal states of the old-state and new-state signals differ.

Claim 13

Dependent Claim 15 words

recording an indication of time as a transition time concurrent with detecting a said transition;

Claim 14

Dependent Claim 15 words

recording an indication of time as a transition time concurrent with detecting a said transition;

Claim 15

Dependent Claim 21 words

determining the transition interval between at least one pair of said transition times, and indicating the baud rate corresponding thereto; and

Claim 16

Dependent Claim 21 words

determining the transition interval between at least one pair of said transition times, and indicating the baud rate corresponding thereto; and

Claim 17

Dependent Claim 163 words

A communication system according to claim 2 wherein the monitoring means is included in a communications control unit in which transmission signals are received on a plurality of cyclically scanned data lines and in which each data line is scanned for one line scan time during such line scan cycle, and wherein said new-state means comprises an input shift register of a communication control unit which register is sequentially coupled to said data lines and when the communication control unit is conditioned to operate in a baud rate detection mode receives a signal from a said data line and provides the signal as the new-state signal on the register least significant bit output; and said old-state means comprises a memory of said communication control unit coupled to receive the shift register least significant bit output and one line scan cycle after such receipt to provide to the transition detection the logic the signal state of said least significant bit as an old-state signal.

Claim 18

Dependent Claim 16 words

conditioning a communication device to decode a transmission of a communication at the indicated baud rate.

Claim 19

Dependent Claim 16 words

conditioning a communication device to decode a transmission of a communication at the indicated baud rate.

Claim 20

Dependent Claim 20 words

A communication system according to claim 4 wherein said timing means is included in said communication control unit and comprises:

Claim 21

Dependent Claim 124 words

A communication system according to claim 5 wherein said recording means is a memory of a data processor and which data processor is connected to the data register of said communication control unit; said arithmetic means is the arithmetic section of said data processor, which arithmetic section is operated in accordance with instructions to operate upon at least one pair of said transition times to compute the transition interval thereof and is operated in accordance with instructions which correlate a said computed transition interval with a baud-rate-code interval range, which range is included in a table of ranges in which each range corresponds to a baud rate, and which instructions search said range table for the table entry corresponding to said computed transition interval.

Claim 22

Dependent Claim 87 words

A communication system according to claim 6 wherein said decoding control means comprises a selectable period clock in the communication control unit, the output of which clock is applied to a strobe input of said shift register, which clock includes selection gates responsive to a baud rate indication indicated by said arithmetic means and transmitted by the processor to the communication control unit selection gates to condition said communication device to receive a communication associated with a said baud-rate-code at the baud rate corresponding to said baud-rate-code.

Claim 23

Dependent Claim 114 words

In a communication device for receiving communications at a variety of baud rates, each of which baud rates corresponds to a unique baud-rate-code, each of which baud-rate-codes is at least one interval of time represented in a transmission of a communication as the interval between a pair of signal state transitions, baud rate detection means for determining the transition interval between a pair of signal state transitions, comprising: A. monitoring means for detecting signal state transitions representative of a baud-rate-code; B. timing means for providing an indication of time; and C. recording means responsive concurrent with said monitoring means detecting a said transition to record a said indication of time as a transition time.

Claim 24

Dependent Claim 114 words

In a communication device for receiving communications at a variety of baud rates, each of which baud rates corresponds to a unique baud-rate-code, each of which baud-rate-codes is at least one interval of time represented in a transmission of a communication as the interval between a pair of signal state transitions, baud rate detection means for determining the transition interval between a pair of signal state transitions, comprising: A. monitoring means for detecting signal state transitions representative of a baud-rate-code; B. timing means for providing an indication of time; and C. recording means responsive concurrent with said monitoring means detecting a said transition to record a said indication of time as a transition time.

Claim 25

Dependent Claim 83 words

Apparatus according to claim 8 wherein said baud rate detection means further comprises: D. arithmetic means for computing the transition interval between a pair of said transition times, for correlating a said computed transition interval with a baud-rate-code time interval to identify a correlated baud-rate-code, and for indicating the baud rate corresponding to said correlated baud-rate-code; and E. baud rate decoding control means responsive to said indicated baud rate to condition a communication device to decode the communication at the inDicated baud rate.

Claim 26

Independent Claim 66 words

A method of coordinating communications in a communication system wherein communications are transmitted at a variety of baud rates and each rate of transmitting a communication in the system corresponds to a unique baud-rate-code, each of which baud-rate-codes is at least one interval of time, represented in a transmission of a communication as the interval between a pair of signal state transitions, comprising the steps of:

Claim 27

Independent Claim 66 words

A method of coordinating communications in a communication system wherein communications are transmitted at a variety of baud rates and each rate of transmitting a communication in the system corresponds to a unique baud-rate-code, each of which baud-rate-codes is at least one interval of time, represented in a transmission of a communication as the interval between a pair of signal state transitions, comprising the steps of:

Claim 28

Dependent Claim 64 words

A method of coordinating communications according to claim 10 wherein said step of determining and indicating the baud rate, comprising the sub-steps of: A. computing the transition interval between a pair of said transition times; B. correlating said computed time intervals with a said baud-rate-code time interval to identify a correlated baud-rate-code; and C. indicating the baud rate corresponding to a said correlated baud-rate-code.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-07-16	1977-01-15	1977-07-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-07-16	1981-01-15	1981-07-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-07-16	1985-01-15	1985-07-17	$7700.00	Window Closed / Lapsed

Method of and apparatus for baud rate detection

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