초록 ▼

A technique for transmitting wideband signals such as video signals over a communication system such as a cellular or Personal Communication System (PCS) which only has narrowband channels. The video signal is first digitized and compressed, and then forwarded to a commutating switch, together with

A technique for transmitting wideband signals such as video signals over a communication system such as a cellular or Personal Communication System (PCS) which only has narrowband channels. The video signal is first digitized and compressed, and then forwarded to a commutating switch, together with any other narrowband signals which are to be transmitted using the same system. The commutating switch demultiplexes the video signal into multiple digital channel signals. The number of digital channel signals dedicated to carrying the video signals may vary as a system controller determines the availability of channel space in the system. The output channels from the switch are then each modulated as required by the particular wireless communication system in use, and forwarded to a digital combiner to produce a wideband composite signal. At a receiving site, the process is reversed, and a digital filter bank, or channelizer, separates the digital channel signals and forwards them to a set of digital demodulators. The demodulated signals are then fed to a multiplexing switch, which, under command from a controller which receives instructions from a system channel assignment controller, directs the channel signals containing the video information to a first-in first-out buffer memory. The reconstructed digital video signal is then decompressed and converted back to analog form for display.

대표청구항 ▼

A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the sampl

A transmitting station capable of transmitting a video signal over a plurality of narrowband wireless communication channels, the transmitting station comprising: a. means for sampling the video signal; b. buffer means, connected to the means for sampling the video signal, for accumulating the samples of the video signal; c. means for identifying a plurality of available narrowband radio channels to which the samples of the video signal are to be assigned; d. means, connected to the identifying means, for selecting a portion of the video samples from the buffer means, the number of selected samples being of a size such that they can be transmitted over one or more of the identified narrowband channels; e. switching means, connected between the buffer means and the identified narrowband channels and responsive to the selecting means, for providing the selected portion of the video samples to the identified channels; f. combiner means, connected to the identified narrowband channels, for combining signals from multiple channels into a single, wideband composite signal; and g. transmission means, connected to the combiner means, for transmitting the wideband signal.