Patent ID: 8369454

Claim:
A data receiving apparatus, comprising: a measuring section configured to measure a first pulse width of a first pulse, a second pulse width of a second pulse, and a third pulse width of a third pulse, during each of the first pulse, the second pulse, and the third pulse, a first signal level of a reception signal is continuous, wherein the first pulse, the second pulse, and the third pulse are sequentially and continuously received by putting a portion of a second signal level different from the first signal level between the first and second pulse and the second and third pulse; a first comparing section configured to perform a first determination based on a measured value of the first pulse width and a measured value of the second pulse width, wherein the first determination is that the first pulse indicates a start of the reception signal and the second pulse indicates a synchronization signal; a second comparing section configured to perform a second determination based on the measured value of the second pulse width and a measured value of the third pulse width, wherein the second determination is that the second pulse and the third pulse indicate the synchronization signal; a control section configured to determine the second pulse as a head of the synchronization signal, based on the first determination of said first comparing section and the second determination of said second comparing section; a third comparing section; and a mean calculating section, wherein said third measuring section measures a fourth pulse width of a fourth pulse having the first signal level which is continued from the third pulse by interposing a portion of the second signal level, wherein said third comparing section determines that the second pulse and the fourth pulse are the synchronization signal, based on the measured value of the second pulse width and a measured value of the fourth pulse width, and wherein said mean calculating section calculates a mean value of the second pulse width, the third pulse width and the fourth pulse width.