Frequency independent information transmission system
First Claim
1. A process for transmitting information consisting of a series of message units selected from a set of defined message units, said transmission process comprising the steps of:
- (a) defining the message units comprising the set of defined message units;
(b) assigning a message unit ratio to each defined message unit;
(c) providing a periodic reference signal having a reference periodic property;
(d) converting each message unit of the information to be transmitted into a set of signals including said reference signal, each message unit being a member of the set of defined message units and related to said reference signal by a specific message unit ratio;
(e) providing an information signal having an information periodic property, said information periodic property being varied for each message unit to conform to the message unit ratio for each message unit;
(f) transmitting said periodic reference signal and said information signal;
(g) receiving said periodic reference signal and said information signal;
(h) determining a received message unit ratio between said reference periodic property and said information periodic property of the received signals;
(i) deconverting said received message unit ratio to a message unit in accordance with the assigned message unit ratio, thereby to convey the information.
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Abstract
The system is used for transmitting information wherein each possible message unit in a set, (e.g. the alpha-numeric symbol set) is defined by a specific interval (I=fs /fRR) and messages are transmitted by conversion to the interval code and for the sending of signals of any two frequencies (fs and FR) that are related by the specific intervals. The signals are received by a receiver which computes the interval, matches it with the pre-defined message unit interval and outputs that message unit. A sequence of message units may be sent using a reference frequency signal and a succession of specific signals each related to the reference frequency by the specific interval for that message unit. A computer program can be utilized for automatically encoding or decoding. The system has the advantages that it is relatively free of errors caused by long term frequency shifting, allows transmission at any frequency level, and allows interacting communication between stations wherein the transmitters operate in entirely different frequency domains. In particular, the system is operable to transmit information in the form of interval-coded tones suitable for interpretation by a human listener. Examples of the use of the system include a clock and a voltmeter comprising tone output circuitry.
12 Citations
38 Claims
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1. A process for transmitting information consisting of a series of message units selected from a set of defined message units, said transmission process comprising the steps of:
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(a) defining the message units comprising the set of defined message units; (b) assigning a message unit ratio to each defined message unit; (c) providing a periodic reference signal having a reference periodic property; (d) converting each message unit of the information to be transmitted into a set of signals including said reference signal, each message unit being a member of the set of defined message units and related to said reference signal by a specific message unit ratio; (e) providing an information signal having an information periodic property, said information periodic property being varied for each message unit to conform to the message unit ratio for each message unit; (f) transmitting said periodic reference signal and said information signal; (g) receiving said periodic reference signal and said information signal; (h) determining a received message unit ratio between said reference periodic property and said information periodic property of the received signals; (i) deconverting said received message unit ratio to a message unit in accordance with the assigned message unit ratio, thereby to convey the information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A signal transmitter for transmitting a message comprising a series of specific message units taken from a set of possible message units, such as an alphabet, said transmitter comprising:
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(1) table means defining each member of the set of possible message units as a ratio relationship; (b) means coupled to the table means for receiving the series of specific message units, and for sequentially determining the ratio relationship defined for each successive specific message unit of the message; (c) means coupled to said receiving and determining means for generating electrical signals including a periodic reference signal having a reference periodic property and for generating an information signal having an information periodic property, said information periodic property being varied for each message unit, the information periodic property being related to the reference periodic property by the ratio relationship determined by said determining means, and (d) output means for coupling said generated signals to transmission means, such as a transmission line or a broadcast radio transmitter or an optical fiber. - View Dependent Claims (12, 13, 14, 15)
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16. A signal receiver for receiving and decoding electrical signals comprising:
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(a) an input unit for receiving electrical signals, including a reference signal and an information signal, each having a periodic property, and for determining the periodic property of received information and reference signals; (b) table means for defining each member of a set of possible message units, such as an alphabet, as different specific ratio relationships between an information periodic property of the information signal and a reference periodic property of the reference signal; (c) means intercoupled with said table means and said input unit for computing the ratio relationship between the information periodic property and the reference periodic property for producing a series of message units from said table means in response to the computed ratio relationships determined from the received signals; (d) output means coupled to said intercoupled means for reproducing the series of message units defined by said last named means. - View Dependent Claims (17, 18, 19)
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20. A tone transmitter for transmitting information comprising a series of specific message units taken from a set of possible message units, such as an alphanumeric set, said transmitter comprising:
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(a) means for assigning each member of the set of possible message units a message tone at a frequency representative of a specific tone frequency ratio to a reference tone frequency to form the series of specific message units; (b) means for receiving the series of specific message units; (c) means coupled to said assigning means and said receiving means for sequentially transmitting the reference tone frequency and the assigned message tone for each of said specific message units. - View Dependent Claims (21, 22, 23, 24)
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25. A tone output device in a digital measuring system for measuring a specific digital quantity, comprising:
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(a) means for generating audible tones; (b) means for receiving component digits of a measured value of said specific quantity; and (c) control means coupled to said generating means and to said receiving means for sequentially generating and transmitting a reference frequency tone and, for each of said received component digits, a message tone at a specific frequency ratio to the frequency of said reference frequency tone, said specific frequency ratio being invariant for a given component digit. - View Dependent Claims (26, 27, 28, 29)
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30. A clock with tone output means, comprising:
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(a) means for measuring time represented by component digits; (b) means coupled to said measuring means for converting each of said component digits into a message tone at a specific frequency ratio to a reference frequency tone, said specific frequency ratio being invariant for a component digit; (c) means coupled to said converting means for relating and transmitting said message tone and said reference frequency tone in sequential order in a tone series, whereby the time value may be transmitted. - View Dependent Claims (31, 32, 33, 34)
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35. An analog voltage measuring device for representing a measured voltage, comprising:
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(a) first means for converting an analog voltage component to representative component digits; (b) second means coupled to said first converting means for converting each of said component digits into a message tone at a specific tone frequency ratio to a reference frequency tone, said specific tone frequency ratio being invariant for a component digit; and (c) means coupled to said second converting means for relating and transmitting said message tones and said reference frequency tone in sequential order in a tone series, whereby the measured voltage may be transmitted. - View Dependent Claims (36, 37, 38)
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Specification