Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate
2007-02-20
2007-02-20
Urban, Edward (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
C455S205000, C455S112000, C455S323000
Reexamination Certificate
active
10649476
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 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 signal from the 900 MHz range to a useable 10.7 MHz left and right signal.
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Jian Xu Zhi
Yongji Huang
Larson Herbert W.
Larson & Larson
Lee John J.
Uni-Art Precise Products Ltd.
Urban Edward
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