Stereo apparatus that includes a master unit and a slave unit
First Claim
1. Stereo apparatus for providing sound in vehicles comprising a receiving means for radio-frequency waves with frequency selection, an antenna connected to said receiving means, an operating means located in the vehicle close to the driver'"'"'s seat including a power amplifier with controls for sound adjustment, and loudspeakers connected to said power amplifier, wherein said receiving means is divided into a master unit close to the driver'"'"'s seat in the vehicle, and a slave unit which is located together with the antenna remotely from said master unit, said slave unit comprising a circuit controlled from said master unit for selecting a desired transmitter frequency signal that includes a stereo signal, a mixer, an oscillator, and a circuit including an intermediate frequency amplifier for converting the selected stereo signal into a signal of intermediate frequency with mainly a constant frequency, and said master unit comprising a detector, a stereo decoder and a pre-amplifier.
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Accused Products
Abstract
An apparatus for providing sound in vehicles which comprises a receiver for radio frequency waves with frequency selection and antenna. The apparatus includes a master unit located in the vehicle close to the driver'"'"'s seat including loud-speakers. The apparatus also includes a slave unit which is located together with the antenna remotely from the master unit. The slave unit includes a circuit controlled from the master unit for selecting a desired frequency and converting the selected signal into an intermediate frequency. The master unit also includes a detector, a pre-amplifier and a power amplifier along with controls for adjusting the receiver.
10 Citations
8 Claims
- 1. Stereo apparatus for providing sound in vehicles comprising a receiving means for radio-frequency waves with frequency selection, an antenna connected to said receiving means, an operating means located in the vehicle close to the driver'"'"'s seat including a power amplifier with controls for sound adjustment, and loudspeakers connected to said power amplifier, wherein said receiving means is divided into a master unit close to the driver'"'"'s seat in the vehicle, and a slave unit which is located together with the antenna remotely from said master unit, said slave unit comprising a circuit controlled from said master unit for selecting a desired transmitter frequency signal that includes a stereo signal, a mixer, an oscillator, and a circuit including an intermediate frequency amplifier for converting the selected stereo signal into a signal of intermediate frequency with mainly a constant frequency, and said master unit comprising a detector, a stereo decoder and a pre-amplifier.
Specification