Sound reproducing with remote amplifying transducer

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS With reference now to the drawing and more particularly FIG.
1 thereof, there is shown a block-pictorial diagram of a system according to the invention.
A sound signal from a sound signal source 11, such as a tuner or tape player, at a source location, typically near the dashboard of an automobile, is faithfully reproduced at a receiving location by loudspeaker 12, typically on a rear or front deck or in a door of an automobile.
The source electro-optical transducer 16 at the source location receives the low-level sound signal from source 11 and converts it into a corresponding light signal that is delivered to light pipe 13.
Light pipe 13 transmits the sound light signal to the receiving electro-optical transducer 14 at the receiving location for conversion into a corresponding electrical signal that is delivered to power amplifier 15.
Power amplifier 15 amplifies this received sound signal and provides it at high power level to loudspeaker 12 that reproduces the sound represented by the signal from sound signal source 11.
The specific forms of electro-optical transducers are not a part of the invention.
The electro-optical transducer 16 at the source location may comprise a light emitting diode that provides a light intensity representative of the contemporary magnitude of the sound signal provided by source 11.
Light pipe 13 may comprise an optical fiber.
Electro-optical transducer 14 may comprise a photodiode that provides an electrical signal representative of the incident light signal provided by light pipe 13.
The light signal transmitted may be digital or analogue.
The invention is advantageous in helping prevent electrical noise from being transduced by loudspeaker 12.
A vehicle is a source of electrical noises produced by the ignition system, flashers and other sources.
A power amplifier near these noise sources or fed by conventional conductors near these sources may amplify this noise to produce annoying audible sounds.
An important feature of the invention is having the loudspeaker driver and power amplifier which drives it at the same location, preferably as an integrated package