Device for coupling of audio signal from an external source to the radio car, device for coupling audio signals to external esterofonicos radio of the car.Apparatus at connection of signal generator for vehicle stereo radio, stereo adapter.Device for coupling of audio signal from an external source radio, automatic machine and device for coupling of audio signal from an external source for radio.

摘要

A stereophonic or monaural adapter is connected to an FM automobile radio via the cigarette lighter of the vehicle. The adapter can connect monaural (Fig. 2) or a stereo signal (Figs. 3A and 3B) generating device, such as a cassette tape player or a compact disc player directly to the sound system of the vehicle via the cigarette lighter receptacle. A transistor modulator-oscillator (65, 71) stage is provided which generates an output (7) indicative of the stereo channels. The stereo channels (2, 4) are multiplexed as an input to the oscillator. The weak signal (7) thus generated is coupled to the vehicle's radio via the stray capacitance of the wires connected to the common power source or battery of the vehicle, and the proximity to the antenna and input stage of the vehicle's radio. The oscillator (65) is tuned to an unused location on the FM radio dial so that the audio signal generated by the cassette or compact disc player (2, 4) can be heard without interference with or from the local FM commercial radio frequencies.