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31results about "Information relaying from field pickup units" patented technology

Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure

The invention relates to a Bi-directional digital TV video on demand realizing device with a PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure, in particular to a device which realizes space division multiplexing by extending the PON and downwards moving the IPQAM. The traditional IPQAM product arranged in a centre machine room or front machine room occupies more frequency bandwidth resources of a coaxial cable to cause a great waste of analog bandwidth. The IPQAM is moved from the centre machine room or the front machine room to a cell or light station, thereby multiplexing the frequency bandwidth resources of the coaxial cable and completely solving the problem of insufficient frequency resources of a coaxial cable network. With the technical scheme, space division multiplexing can be realized by downwards moving IPQAM equipment, the frequency utilization ratio of an HFC (Hybrid Fiber and Coax) network is greatly increased, and an optimal video transmission scheme is provided for the integration of three networks. The Bi-directional digital TV video on demand realizing device can be widely applied to occasions such as video on-demand, bi-direction interactive TV and the like.
Owner:顾海涛

Musical instrument wireless transmission system based on 2.4G wireless digital audio technique

The invention discloses a musical instrument wireless transmission system based on 2.4G wireless digital audio technology which includes a musical instrument wireless emitter and a wireless receiver. The emitter and the receiver are matched into a receiving/transmitting system; the system uses self-adaptive frequency hopping technology in international 2.4G ISM frequency band, can automatic avoid strong jamming frequency band, and has high audio transmission quality and stronger communication confidentiality; the musical instrument wireless emitter includes musical instrument pickup device part, audio preprocessor part, AD convertor part, coding demodulation part, RF transmitting part, LCD display part and electrical source part; the musical instrument wireless receiver includes RF receiver part, demodulation decoding part, DA convertor part, audio output processing part, USB recording access part, LCD state display part and electrical source part. The musical instrument wireless transmission system solves problems of large noise and wiring in disorder caused by traditional audio cable connection in stage; conveniences of wireless connection abandons cable that limits bandsman move in musical instrument thoroughly, gives enough free acting space to bandsman.
Owner:黎荣生
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