Invention Application
- Patent Title: Local wireless audio signal RF transmitter and receiver
- Patent Title (中): 本地无线音频信号RF发射机和接收机
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Application No.: US10649476Application Date: 2003-08-26
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Publication No.: US20050057403A1Publication Date: 2005-03-17
- Inventor: Huang Yongji , Xu Jian
- Applicant: Huang Yongji , Xu Jian
- Assignee: UNI-ART PRECISE PRODUCTS LTD.
- Current Assignee: UNI-ART PRECISE PRODUCTS LTD.
- Main IPC: H01Q1/24
- IPC: H01Q1/24 ; H04B1/04 ; H04B1/26 ; H04B7/00 ; H04R5/04 ; H04S1/00

Abstract:
A local wireless system for transmitting a modulated RF carrier audio signal from a base unit to a receiver unit is provided. The base unit has a pair of audio input connections of which are coupled to an audio source amplification device for receiving left and right audio signals. The receiver unit has a pair of electroacoustic transducers (speakers) for reproducing demodulated left and right audio signals modulated upon the RF carrier audio signal. The base unit encloses a transmitting circuit having a first antenna and first, second and third circuits which modulate the left and right audio signals onto an RF carrier audio signal in the 900 MHz range. A receiver unit encloses a receiver circuit and is coupled to the pair of speakers. The receiver circuit performs a single downconversion of the modulated RF carrier audio signal from the 900 MHz range to a useable 10.7 MHz left and right signal.
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