Abstract: A method and system for sending and receiving binary bit stream in a composite video signal, such as a NTSC signal. The binary bit stream is modulated according to quadrature amplitude modulation, converted to analog and translated to an intermediate frequency relative to the composite video signal and the associated sync pulses, and combined with the composite video signal. At reception of a composite video signal that includes the modulated bit stream, the sync pulses of the composite video signal are determined by extracting the composite video signal from the modulated bit stream. Also, the modulated bit stream is extracted from the composite video signal, separated into its component parts based on the sync pulses, and combined into a binary bit stream.

Abstract: A method and system for sending and receiving binary bit stream in a composite video signal, such as a NTSC signal. The binary bit stream is modulated according to quadrature amplitude modulation, converted to analog and translated to an intermediate frequency relative to the composite video signal and the associated sync pulses, and combined with the composite video signal. At reception of a composite video signal that includes the modulated bit stream, the sync pulses of the composite video signal are determined by extracting the composite video signal from the modulated bit stream. Also, the modulated bit stream is extracted from the composite video signal, separated into its component parts based on the sync pulses, and combined into a binary bit stream.

Abstract: A portable receiving system for receiving data products and data product information. The system includes a portable data unit and a subscriber interface unit. The portable data unit includes a broadcast signal receiver for receiving at least one of a data product or data product information modulated with a broadcast signal, a processor for separating the at least one data product or data product information from the broadcast signal by demodulating the broadcast signal, memory for storing the separated at least one data product or data product information, a presentation device for presenting the separated at least one data product or data product information, and a user interface for allowing selection of a data product associated with the presented data product or data product information. The subscriber interface unit includes a network interface for connecting the subscriber interface unit to a data product center over a communications network, and an interface for connecting to the portable data unit.