Microchip for telecasts on a cell phone. Free Technical Library News

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Microchip for telecasting on a cell phone

24.02.2001

Specialists from the Matsushita Denki Electrical Corporation, known around the world under the Panasonic trademark, have developed a high-density custom integrated circuit that makes it possible to simultaneously wirelessly transmit multiple moving pictures, which will allow you to watch several TV shows on one mobile phone screen in the future.

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Sony MDR-HW9.1DS 700 Wireless Headphones 09.04.2014

Sony introduced the MDR-HW700DS wireless headphones, which, according to the manufacturer, are the world's first wireless headphones with support for ten-channel surround sound (9.1).

For multi-channel sound reproduction, the headphones use Sony's exclusive Virtualphones Technology (VPT), which complements the basic 5.1 package with two more rear and two front top drivers. With multiple modes to choose from, the Sony MDR-HW700DS user is said to be able to optimize surround sound for movies, games and other sources.

The headphones use emitters with a diameter of 50 mm. The declared range of reproducible frequencies is 5-25000 Hz.

The sound processor, made in a separate unit, weighs 430 g. It is equipped with three HDMI inputs, an optical digital input and an analog stereo input. The list of decodable formats includes Dolby TrueHD, DTS, Linear PCM 2ch/5.1ch/7.1ch, Dolby Digital Plus, Dolby Digital , DTS-HD Master Audio, DTS-HD High Resolution Audio, DTS Express, DTS Digital Surround, DTS-ES, DTS 96/24. Wireless connection is made in the 2,4 GHz, 5,2 GHz and 5,8 GHz bands. Headphones weigh 320 g. Their battery charges in 3 hours and provides up to 12 hours of battery life.

At the same time, two more models of wireless headphones were also presented, according to the manufacturer, available for a wider range of consumers: MDR-HW300K and MDR-RF811RK. They use emitters with a diameter of 40 mm. The frequency response of the first model is 10-22000 Hz, the second one is 20-20000 Hz. For wireless connection, in the first case, the 2,4 GHz band is used, in the second, the FM band, the communication range reaches 30 and 100 m, respectively.

The MDR-HW300K headphones weigh 190g and have a battery life of up to 10 hours. It takes 3 hours to fully charge the battery. The MDR-RF811RK headphones weigh 270g and have a battery life of up to 13 hours, but their battery takes 16 hours to fully charge. In 1 hour, it can be charged to a level sufficient for operation for 45 minutes. If you use the AAA cell, the battery life is up to 28 hours.

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