Abstract: Information encoded in a radio signal is decoded by tuning an outside receiver to the radio signal, the outside receiver emitting a local signal capable of identifying the radio signal, and arranging a local signal stage of an adapter receiver to detect signals at determined frequencies in a local signal band within which the outside receiver emits the local signal. The adapter receiver is tuned to receive the desired radio signal in response to detection of a local signal at one of the determined frequencies, and information encoded in the radio signal is then decoded. The outside receiver may be a conventional superheterodyne FM radio broadcast receiver that emits local oscillator (LO) signals that are offset in frequency by 10.7 MHz from the frequency of a radio signal to which the receiver is tuned, and the radio signal carries information encoded using a Radio Data System (RDS) standard.

Abstract: A wireless adapter for decoding information from a broadcast signal to which a radio is tuned. The radio emits a local signal that serves to identify the broadcast signal, and a coupling part in the vicinity of the radio responds to the local signal. The coupling part produces a tuning signal in response to the local signal, and the tuning signal is applied to an adapter receiver circuit so that the receiver circuit acquires the broadcast signal to which the radio is tuned. A decoder circuit then decodes information contained in the acquired broadcast signal. In one embodiment, the adapter can be mounted in a vehicle near the vehicle radio. When the radio is tuned to a station that encodes, e.g., RBDS radio text on a sub-carrier of its broadcast signal, the adapter will acquire the station's sub-carrier, and will display the text conveniently and safely.

Abstract: A spectrum-efficient channel compatible technique of broadcasting and receiving television signals includes generating image signals corresponding to certain parts of an image frame to be transmitted, modulating first image signals corresponding to first contents of the image frame on a first radio frequency (RF) carrier wave signal corresponding to a television channel to produce first RF television signals, and modulating second image signals corresponding to second contents of the image frame on a second RF carrier wave signal corresponding to the television channel to produce second RF television signals. The first RF television signals are radiated from a first antenna having a first polarization, and the second RF television signals are radiated from a second antenna having a second polarization orthogonal to the first polarization.

Abstract: High definition television (HDTV) signals are broadcast in a manner to be compatible with television receivers that operate to reproduce standard definition images, and the broadcast HDTV signals are contained within an existing frequency band in the electromagnetic spectrum allocated for transmission of the standard definition images. An image to be broadcast is scanned with a high definition camera capable of producing an image frame of N lines of resolution, wherein N is equal to about twice the line resolution of a standard definition image frame. The camera produces N/2 odd line image signals and N/2 even line image signals for each image frame. The odd line signals are modulated on a radio frequency (RF) carrier wave to produce HDTV odd line image signals occupying at most the same frequency band in the electromagnetic spectrum as occupied by standard definition images.