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Multiple signal carrier transmission apparatus and method

A signal and equipment technology, applied in the field of stereo wireless transmission system, can solve the problems of FM signal reflection, attenuation, interference, etc.

Inactive Publication Date: 2004-09-01
KIMA WIRELESS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] While FM broadcast systems transmit efficiently and reproduce stereo sound fairly accurately, FM signals are prone to reflections from walls (especially for mobile receivers, such as stereo headphones worn by an individual walking around a building). so), and attenuation interference caused by channel crosstalk (bleed over)

Method used

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  • Multiple signal carrier transmission apparatus and method
  • Multiple signal carrier transmission apparatus and method

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Embodiment Construction

[0031] Referring now to the drawings, and in particular to FIGS. 2-4 , there is illustrated a multi-signal carrier transmission apparatus and method for wirelessly transmitting a stereo signal between a stereo signal source and a remote receiver in which the stereo signal is broadcast through a loudspeaker. .

[0032] As shown in Figures 2, 3A and 3B, according to one aspect of the present invention, transmitter device 20 receives stereo input signals L and R from separate stereo signal sources (not shown). The stereo signal source may be any source of stereo audio or video signals including stereo radio broadcasts, Internet streaming media and audio from recorded media such as CDs, MP3 players and the like. The left and right signals are input to the stereo audio encoder 22, which performs simple addition and subtraction operations, thereby outputting two signal streams, the first signal stream 24 including the sum (L+R) of the input signals. The second output signal stream ...

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Abstract

A multiple signal carrier transmission apparatus and method for broadcasting stereo sounds to an audio output device uses three related carrier frequencies on which are modulated the sum of first and second stereo channel signals (24) and the first and second stereo channel signals (26) themselves. The composite multiple carrier frequency signal is transmitted to a receiver which separates the three carrier frequency signals to generate a separate left channel signal (84), a right channel signal (94) and a composite center channel (102), monophonic, signal which is the sum of the first and second channel signals. A detector monitors the signal strength of each separate left and right channel signal to detect a decrease in either channel output below a threshold.

Description

technical field [0001] The present invention relates to a wireless signal transmission system, and more particularly, to a stereo wireless transmission system. Background technique [0002] Stereo sound is desirable in wireless transmission systems that are particularly suitable for transmitting the radio and / or audio portion of a television broadcast, more particularly to a wireless transmission system for music. [0003] Although two independent signals are combined in a stereo transmission system, the sound signal is spatially divided into two left and right channels of 50 Hz to 15 kHz. Music or sound originating from the left side is reproduced only in the left speaker, and music or sound originating from the right side is reproduced only in the right speaker. [0004] While two separate transmitter and receiver systems can be used to broadcast left and right channel sound to stereo speakers, headphones, etc., the prior art still utilizes frequency division multiplexing...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04H20/88H04S1/00
CPCH04H40/81H04H20/48H04H20/88H04S1/00
Inventor 罗纳德·G·佩斯迈克尔·K·佩迪果特里·A·梅尔基
Owner KIMA WIRELESS TECH
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