Sony Corporation

Sony Electronics Inc

Sony Deutschland Gmbh

Kazuji Sasaki

Kunio Fukuda

Takehiro Sugita

Masaya Takano

Kenichi Kawasaki

Masayuki Katakura

Dragan Krupezevic

Veselin Brankovic

Keiji Fukuzawa

Mohamed Ratni

Hamid Amir-Alikhani

Kazuyuki Saijo

Disclosed herein is a communication system including: at least one power line communication apparatus connected via a general power line for supplying a commercial alternate current power; a communication terminal having a modem for power line communication, and a plurality of first coils having different directivities; and a coupling apparatus, connected to a power line, having a filter for attenuating an alternate current component of the power line, and a second coil arranged after the filter; wherein the communication terminal executes mutual communication with any of the power line communication apparatus connected via the general power line through proximity communication based on an electromagnetic coupling action that is generated between the plurality of first coils and the second coil when the communication terminal is brought to the proximity of a coupling surface of the coupling apparatus.

Communication system and communication apparatus

A mixer circuit accumulates I signal (digital signal of first channel) having its band limited by low-pass filter and first carrier signal to perform two-phase shift keying modulation thereon. An adder adds fundamental-wave component of bit clock signal BCK into Q signal (digital signal of second channel) having its band limited by the another low-pass filter to obtain a resultant added-up signal. Another mixer circuit accumulates the added-up signal and second carrier signal to perform two-phase shift keying modulation thereon. Output signals of the mixer circuits are input to another adder so that they may be added up to obtain a QPSK signal as a modulated quadrature signal. The QPSK signal contains frequency signals whose frequencies are a sum of bit clock frequency and carrier frequency and a difference between them. When demodulating, the carrier signal and the bit clock signal are reproduced using the frequency signals.

Digital modulation circuit and method as well as digital demodulation circuit and method

A wireless transmission system operating in a 60 GHz frequency range comprises fixed hubs (public download server) () and mobile terminals (). The fixed hubs () have antennas () with a wide angle beam shape. The mobile terminals () have antennas () with a narrow angle beam shape. The fixed hubs (public download server) () are connected by means of a connection line () to an information source such as a network backbone or a main server.

Wireless transmission system

In a variable gain amplifier apparatus, wide input dynamic range can be secured and low noise characteristic can be obtained by employing first and second variable gain amplifiers have different noise characteristics and different saturation input levels and receive a same input signal. Output signals of the first and second variable gain amplifiers are added to each other to provide an output signal of the variable gain amplifier apparatus. Desired noise characteristic and saturation input level characteristic of the variable gain amplifier apparatus can be obtained by selecting the noise characteristics and the saturation input levels of the first and second variable gain amplifiers appropriately. This allows the variable gain amplifier apparatus to have a wide input dynamic range and low noise characteristic.

Variable gain amplifier apparatus

Synchronizing detecting circuit for a digital broadcasting receiver

Growing community of inventors

Kanagawa, Japan

Kazuji Sasaki