Title:
直交復調器及び質問器
Document Type and Number:
Japanese Patent JP4676357
Kind Code:
B2
Abstract:
A quadrature demodulator generates an I-signal from a modulated reception signal and a local signal, generates a Q-signal from the local signal and the local signal having a phase shifted through 90 degrees. Capacitors remove DC components from the I- and Q-signals. Low-pass filters remove frequency components higher than the frequencies of the I- and Q-signals. An I-signal squaring section squares the I-signal having passed through the low-pass filters. A Q-signal squaring section squares the Q-signal having passed through the low-pass filters. An adding section adds the squared I-signal and the squared Q-signal together. A comparator then compares the level of an S1 signal resulting from the addition with a threshold to obtain an S2 signal. A data generating section of a digital signal processing section executes a process of inverting the signal level of the S2 signal at every rising edge of the S2 signal to demodulate reception data.
Inventors:
Nobuo Murofushi
Satoshi Oishi
Satoshi Oishi
Application Number:
JP2006048767A
Publication Date:
April 27, 2011
Filing Date:
February 24, 2006
Export Citation:
Assignee:
TOSHIBA TEC CORPORATION
International Classes:
H04L27/22; G06K17/00; H03D1/00; H04B1/30; H04B1/59; H04B5/02
Domestic Patent References:
| JP2004147016A | ||||
| JP2003520492A | ||||
| JP11355159A | ||||
| JP2005136620A | ||||
| JP6244754A | ||||
| JP8069583A | ||||
| JP2005269404A |
Attorney, Agent or Firm:
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto