Patent ID: 8625564
Filing Date: 2014-01-07
Classification: H04M,H04W

Abstract:
1. A radio communication apparatus that performs radio communication with another communication apparatus, the radio communication apparatus comprising: an antenna including plural antenna elements; a mechanical switch configured to detect contact between at least one physical surface of the another communication apparatus and the radio communication apparatus and to generate a contact detection signal, the mechanical switch detecting contact through depression thereof; a first modulating and demodulating circuit to communicate an input signal by a single communication channel when the radio communication apparatus is not in physical contact with the another communication apparatus, the first modulating demodulating circuit including circuitry to insert redundant forward error correction data into the input signal, insert synchronous data into the input signal after the redundant forward error correction data is inserted, multiply the input signal with a pseudo-random number to generate a spread spectrum signal, adjust an impulse response of an output signal of the multiplier, and shape a frequency spectrum of an output signal of the impulse adjuster, an output of the waveform shaper being communicated via the single communication channel when the radio communication apparatus is not in physical contact with the another communication apparatus; a second modulating and demodulating circuit to communicate the input signal by a plurality of communication channels when the radio communication apparatus is in physical contact with the another communication apparatus, the second modulating and demodulating circuit including a plurality of modulating circuits, each modulating circuit inserting redundant forward error correction data into the input signal, inserting synchronous data into the input signal after the redundant forward error correction data is inserted, adding a delayed adder output to an output of the synchronous data, and modulating an output of the adder with a predetermined transmission frequency; and a control circuit to control communication based on the contact detection signal, wherein,