Other

Kouichi Takano

Shigeyuki Itoh

Tomohiro Saito

Shoji Tanaka

Akinori Hashimoto

Hisakazu Katoh

Toshihiro Nomoto

Hajime Matsumura

Junji Kumada

Kazuhiko Shibuya

Fumiaki Minematsu

Yuichi Iwadate

Hiroyuki Hamazumi

Masaru Takechi

Stabilized carrier recovery is achieved even at the time of a low C/N ratio by measuring the phase of a signal and controlling VCO or NCO (Numerical Controlled Oscillator) using only a period having few constellation points. At this time, false lock phenomenon is avoided as follows. That is, relatively short SYNC modulated by an already-known pattern is entered into a modulation wave, VCO or NCO oscillation frequency is swept in a wide range and sweep is stopped at a frequency in which the SYNC can be received, thereby carrying out coarse control AFC. Further, a period having long to some extent, having few constellation points is provided in the modulation wave and then, a difference between the frequency of a received modulated signal and a local oscillation signal of VCO or NCO is obtained in this period. This frequency difference is analyzed according to the phase differential function method, self-correlation function method or count method, and the VCO or NCO is controlled based on this result of analysis.

AFC circuit, carrier recovery circuit and receiver device capable of regenerating a carrier reliably even at the time of low C/N ratio

A louver device comprises a main body formed of a flexible sheet-like material. A large number of slits are formed in the main body such that the portions between the adjacent slits constitute slats. The louver device also comprises holding/deforming means for shearing at least part of the main body in the direction of the surfaces of the main body. The shearing force applied to the main body serves to twist the end of the slats, thereby slanting the slats.

Louver device formed by sheet-like material

Growing community of inventors

Setagaya-ku, Tokyo, Japan

Kouichi Takano