Radio communication system for data transmission and reception

Claim 2

A radio communication system for data transmission and reception, which is comprised of a transmission device and a reception device; said transmission device comprises a modulation circuit supplied with message signals from a calling circuit, a radio signal transmitter for transmitting output signals of the modulation circuit, through air, after converting the output signals into radio wave signals, and an optical signal radiator for radiating the output signals of the modulation circuit, through air, after converting the output signals into light wave signals; and said reception device has a contrivance capable of receiving both said radio signals and said optical signals, of combining said signals in order to reproduce said message signals, and of demodulating said message signals from the combined signals.

Claim 3

A radio communication system according to claim 1; wherein said transmitter and said radiator are constructed as a signal output unit which has a plurality of luminous devices in connection with a loop antenna state, and simultaneously emits the radio wave signals and the light wave signals into the air on the basis of current flowing in said luminous devices.

Claim 4

A radio communication system according to claim 1; wherein said light signal radiator comprises a plurality of light emitting diodes for radiating said light wave signals, a constant current source, and a switching transistor, all of which are connected in series; said radio signal transmitter comprises a transistor as a tuning amplifier, a resonance circuit for resonating an output of the transistor, and an antenna for outputting said radio wave signals; and said reception device comprises a receiving antenna for said radio wave signals from said antenna, a resonance circuit for resonating the received radio wave signals and extracting the necessary component from said radio wave signals, an optical signal acceptor for accepting said light wave signals and having a photodiode and resistor, an adder as a combining means for adding said necessary component of the radio wave signals and said light wave signals, a tuning amplifier for tuning and amplifying an output from said adder, a demodulation circuit for demodulating an output of said tuning amplifier to reproduce said message signals, and a message display circuit for displaying the reproduced messages.

Claim 5

A radio communication system according to claim 1: wherein said reception device comprises a receiving antenna for receiving said radio wave signals, a resonance circuit for resonating the received signal and extracting a necessary component of the signals, the first tuning amplifier for the radio wave signals, an optical signal acceptor having a photodiode and resistor and for accepting the light wave signals, the second tuning amplifier for the light wave signals, a level determining circuit supplied with said radio and light wave signals from said first and second tuning amplifier to output a changeover signal, a changeover switch for turning over said radio and light wave signals on the basis of said changeover signal, a demodulation circuit for demodulating the selected signal by said switch, and a message display for displaying the message by the demodulated signal.

Claim 6

A radio communication system according to claim 1; comprising a radio signal receiving portion for receiving the radio wave signals, an optical signal receiving portion for receiving the light wave signals, and a signal addition conversion portion for adding and converting both the radio and light wave signals; wherein said radio signal receiving portion comprises an antenna, a first resonance circuit for extracting a necessary component from the received radio wave signals, a first tuning amplifier for tuning and amplifying an output of said first resonance circuit, a first mixer for mixing signals of said first tuning amplifier and a local oscillator to generate a first intermediate frequency signal, a intermediate frequency signal amplifier for amplifying the intermediate signal, and a first discriminator for discriminating and converting frequency shift keying (FSK) signals amplified by said first intermediate amplifier into first baseband signals; said optical signal receiving portion comprises a photodiode for accepting the light wave signals, a second resonance circuit for extracting a necessary component from the accepted light wave signals, a second tuning amplifier for tuning and amplifying an output of said second resonance circuit, a second mixer for mixing signals of said second amplifier and said local oscillator to generate a second intermediate frequency signal, a second intermediate frequency signal amplifier for amplifying the second intermediate signal, and a second discriminator for discriminating and converting FSK signals amplified by said second intermediate amplifier into second baseband signals; and said signal addition conversion portion comprises a signal adder for adding said first and second baseband signals to generate third baseband signals, a changeover switch for selecting any of said first to third signals on the basis of predetermined timing signal, a timing signal generator for generating said timing signal, a decoder for decoding the selected baseband signals, a data buffer for storing the decoded signals on the basis of said timing signal, an error detector for detecting errors in an output of said buffer, an output circuit for output of message signals on the basis of said timing signal, and a message display circuit for displaying the message signals.

Claim 7

A radio communication system according to claim 2; wherein said signal output unit, which is provided in said transmission device and used as said radio signal transmitter and said optical signal radiator in common, comprises a diode loop having a plurality of light emitting diodes connected to each other into a loop, a constant current source connected with said loop, a transistor connected with said source, a modulator connected between a base and emitter electrodes of said transistor, and a constant voltage power supply connected between said diode loop and a connection point of said transistor and modulator.

Claim 8

A radio communication system according to claim 6; wherein said diode loop comprises a primary loop pattern which is provided at the outermost side having a radius r1 and has a plurality of light emitting diodes arranged at regular intervals, and two auxiliary loop patterns which are provided at the inner side of said primary loop pattern and have radii r2 and r3 (r1 > r2 > r3), respectively; and said primary loop pattern and said auxiliary loop patterns have the same current flowing in the same direction.

Claim 9

A radio communication system according to claim 6; wherein said diode loop comprises a circular connection pattern which is provided at the outer side having a radius r1 and has a plurality of light emitting diodes arranged at regular intervals, and a cancel pattern which is provided at the inner side of said circular pattern has a radius r4 smaller than the radius r1; and said circular pattern has a current flowing in a direction, while said cancel pattern has the current flowing the opposite direction.

Claim 10

A radio communication system according to claim 2; wherein said signal output unit, which is provided in said transmission device and used as said radio signal transmitter and said optical signal radiator in common, comprises a connection pattern having a plurality of light emitting diodes connected to each other into a straight line, a constant current source connected with said line, a transistor connected with said source, a modulator connected between a base and emitter electrodes of said transistor, and a constant voltage power supply connected between said pattern and a connection point of said transistor and modulator.

Claim 11

A radio communication system according to claim 9; wherein said connection pattern further comprises a return pattern being formed by the wire which is closely adhered to a part of said straight line through an insulation member with addition to said straight line which is comprised of a plurality of light emitting diodes.

Claim 12

A radio communication system according to claim 1; wherein said reception device is schematically comprised of a radio signal receiving portion, an optical signal receiving portion, and a message signal reproducing portion; said radio signal receiving portion comprises an antenna, a resonance circuit for extracting a fundamental wave component, a tuning amplifier for tuning and amplifying the extracted fundamental wave component, a second resonance circuit for extracting a third-harmonic wave component, a second tuning amplifier for tuning and amplifying the extracted third-harmonic wave component, an 1/3 countdown circuit for changing a frequency of said third-harmonic component back to the same frequency of said fundamental wave, a delay circuit for delaying the third-harmonic wave, an adder for adding said fundamental and third-harmonic component, and a demodulator for demodulating the added radio waves; said optical signal receiving portion comprises a light acceptor, a tuning amplifier for tuning and amplifying optical signals accepted by said acceptor, and a demodulator for demodulating said optical signals; and said message signal reproducing portion comprises a level determiner for determining levels of said radio signals and optical signals, and a multiplier for performing the multiplication said radio signals, said optical signals, and the output of said level determiner.

Claim 13

A radio communication system according to claim 1; wherein said reception device comprises an antenna for receiving radio signals, a fundamental wave receiving portion for extracting a fundamental component from the received radio signals, a plurality of high-harmonic wave receiving portions for extracting a second to an n-th high-harmonic components, respectively, a photodiode for accepting optical signals as a light acceptor, a tuning amplifier for tuning and amplifying said optical signals, a level determination circuit for determining output levels of said fundamental and high-harmonic components of said radio waves and said optical signals, and a changeover switch for selecting and outputting the highest level signal of all said signals.

Claim 14

A radio communication system according to claim 1; wherein said reception device comprises an antenna for receiving radio signals, a resonance circuit for resonating the received radio signals and extracting necessary components of said radio signals, an amplifier circuit for amplifying said radio signals, a level determination circuit for determining output levels of said amplifier circuit, and a tuned points selection circuit for selecting the highest frequency of said radio signals on the basis of the output of said level, determination circuit by shifting in order a tuned point of a plurality of points.

Claim 15

A radio communication system according to claim 1; wherein said transmission device is schematically comprised of a radio paging device having a calling circuit and a modulation circuit, a wire type PA device having a microphone and a PA amplifier, two feeder lines which are connected to calling devices, a first low pass filter (LPF) consisting of two coils and being connected between said amplifier and said feeder lines in series, and a first high pass filter (HPF) consisting two capacitors and being connected in parallel between said modulation circuit and said feeder lines; and said calling devices are comprised of a first and second calling devices, in which said first calling device comprises a first PA speaker, a second HPF provided between said first speaker and said feeder lines, an optical signal radiator, and a second LPF provided between said radiator and said feeder lines, and in which said second calling device comprises a second PA speaker, a third HPF provided between said second speaker and said feeder lines, a radio signal transmitter, and a third LPF provided between said transmitter and said feeder lines.