Programmable data terminal set
First Claim
1. A system for generating audio signals representative of the digital data output from a digital computer data source to be transmitted in a computer-to-computer radio data link comprising:
- a general purpose digital computer being programmed for (1) receiving a plurality of data frames from a digital computer data source, each said frame including a predetermined number of data bits, (2) adding a predetermined number of Hamming code parity check bits for each said data frame, (3) converting each bit-pair of each said data frame into a predetermined phase shift complex value and computing a Doppler tone phase complex value, (4) converting all of said predetermined phase shift complex values into a sequence of real sample values for generation of an audio signal, and (5) determining the correct time to transmit data; and
interface means operably coupled to said general purpose digital computer for receiving said sequence of real sample values and for producing audio signals therefrom representative of the data in said data frame.
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Accused Products
Abstract
An operator console, a general purpose digital computer and a radio set irface are connected to perform the modulation and demodulation of the differential coherent quadrature phase shift signal used to transmit the digital information over a computer-to-computer radio link. The console is used to initiate communications and to control and monitor link operation. The computer performs all of the signal processing and control functions. The radio set interface performs analogue-to-digital (A/D) and digital-to-analogue (D/A) conversions for the received and transmitted signals, respectively. The programmable data terminal set (PDTS) also controls the data link operation and sequencing and tests its own performance during operation.
123 Citations
18 Claims
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1. A system for generating audio signals representative of the digital data output from a digital computer data source to be transmitted in a computer-to-computer radio data link comprising:
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a general purpose digital computer being programmed for (1) receiving a plurality of data frames from a digital computer data source, each said frame including a predetermined number of data bits, (2) adding a predetermined number of Hamming code parity check bits for each said data frame, (3) converting each bit-pair of each said data frame into a predetermined phase shift complex value and computing a Doppler tone phase complex value, (4) converting all of said predetermined phase shift complex values into a sequence of real sample values for generation of an audio signal, and (5) determining the correct time to transmit data; and interface means operably coupled to said general purpose digital computer for receiving said sequence of real sample values and for producing audio signals therefrom representative of the data in said data frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a system for transmitting data by means of a radio link between a plurality of digital data computers including a plurality of radio sets each being associated with one of said digital data computers for transmitting and receiving data signals, the improvement comprising:
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a plurality of general purpose digital computers each being operably coupled to one of said plurality of digital data computers and each being programmed for controlling the transmission and reception of digital data between said plurality of digital data computers and for processing the data outputs of the one of the plurality of digital data computers operably coupled thereto and for producing a sequence of digital sample values for generation of an audio signal; and a plurality of interface means each being operably coupled to the output of one of said plurality of general purpose digital computers and to the input of one of said plurality of radio sets for receiving said digital sample values, for converting said digital sample values to audio signals for transmission, for receiving real valued audio signals from said one of said plurality of radio sets operably coupled thereto and for converting said real valued audio signals into corresponding digital values. - View Dependent Claims (10)
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11. A system for receiving data in a computer-to-computer radio data link comprising:
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interface means for receiving modulated radio signals representative of sampled data from a first computer, for producing in-phase and quadrature phase components therefrom and for analogue-to-digital converting said components to produce digital samples; a general purpose digital computer operably coupled to the output of said interface means and being programmed for receiving said digital samples, for processing said digital samples to reconstruct said sampled data and for sending said reconstructed sampled data to a second computer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of transmitting and receiving data between a plurality of digital computers by means of a radio link comprising the steps of:
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(1) connecting each one of a plurality of general purpose digital computers to one of said plurality of digital computers; (2) programming each of said general purpose digital computers to control the timing of data transfer between said plurality of digital computers; (3) programming each of said general purpose digital computers for converting the data received from the one of said plurality of digital converters connected thereto into a sequence of sample values to be used for generation of an audio signal transmitted over said radio link; (4) performing a digital-to-analogue conversion of said sequence of sample values to provide transmitter composite digitized audio tones; (5) filtering said transmitter composite digitized audio tones to provide composite audio tones representative of said data received; (6) transmitting and receiving said audio tones over said radio link; (7) deriving in-phase and quadrature phase component signals from the received audio tones; (8) performing an analogue-to-digital conversion of the derived in-phase and quadrature phase component signals to provide receiver composite digitized audio tones; (9) programming each of said general purpose digital computers for converting the receiver composite digitized audio tones into said data received from the one of said plurality of digital computers.
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Specification