Abstract: An audio sound signal encoding device includes: a converter that adds up all multiple channel signals included in multichannel voice sound input signals to generate an addition signal and generates a difference signal between channels of the multiple channel signals; a first encoder that encodes the addition signal in a coding mode in accordance with a characteristic of the addition signal to generate first encoded data; a second encoder that encodes the difference signal in the coding mode that was used for encoding the addition signal, to generate second encoded data; and a multiplexer that multiplexes the first encoded data and the second encoded data to generate multichannel encoded data.

Abstract: An audio sound signal encoding device includes: a converter that adds up all multiple channel signals included in multichannel voice sound input signals to generate an addition signal and generates a difference signal between channels of the multiple channel signals; a first encoder that encodes the addition signal in a coding mode in accordance with a characteristic of the addition signal to generate first encoded data; a second encoder that encodes the difference signal in the coding mode that was used for encoding the addition signal, to generate second encoded data; and a multiplexer that multiplexes the first encoded data and the second encoded data to generate multichannel encoded data.

Abstract: An optical scanner unit includes an LD unit, a polygon mirror deflecting a light beam, an optical scan system focusing the light beam from the polygon mirror on a photoconductive drum to form an electrostatic latent image, and a synchronous detector receiving a part of the light beam to detect a write start position on the photoconductive drum in main scan direction. The synchronous detector is fixed on a portion of a housing at predetermined angles in main and sub scan directions relative to an incidence angle of the light beam on the synchronous detector.

Abstract: An optical scanner unit includes an LD unit, a polygon mirror deflecting a light beam, an optical scan system focusing the light beam from the polygon mirror on a photoconductive drum to form an electrostatic latent image, and a synchronous detector receiving a part of the light beam to detect a write start position on the photoconductive drum in main scan direction. The synchronous detector is fixed on a portion of a housing at predetermined angles in main and sub scan directions relative to an incidence angle of the light beam on the synchronous detector.