Patent ID: 8315292

Claim:
A communication apparatus, comprising a transmitter for generating and transmitting a data signal having a variable cycle of a high pulse interval and a low pulse interval, wherein data is superposed as time length of a pulse interval, and a receiver for receiving said data signal, said transmitter and said receiver are connected through a single communication line, wherein said receiver comprises: a receiver-side oscillator circuit for oscillating a reference pulse as a count reference of said data signal; a counter circuit for counting said high pulse interval of said received data signal by converting it to a reference pulse number of said oscillator circuit, wherein said counter circuit does not count said low pulse interval of said received data signal; and a comparator circuit to judge whether a value of said data signal is 0 or 1 by comparing said high pulse interval of said data signal counted by said counter circuit with a first reference value, and said transmitter comprises: a transmitter-side oscillator circuit for oscillating a reference pulse as a count reference of said data signal; and an output circuit to generate and output said data signal with a pulse interval that is defined as data based on said first reference value, wherein said pulse interval is set based on count of pulse number of said reference pulse.