Broadcasting to all Channels of a Superheterodyne Radio Simultaneously

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The U.S. Navy seeks a partner for licensing and collaboration on a method of accessing all channels of a superheterodyne audio receiver regardless of the channel selected on the receiving device.

Superheterodyne audio receivers were invented during World War I and continue to be in wide-spread use. These receivers, often shorted to superhet, are a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency which can be more conveniently process than the original frequency. Currently, superhet receivers are used in a wide range of radios including AM/FM radios, short wave radios, satellite radios, and cell phones.

NSWC Crane has developed and patented an apparatus and method for accessing all channels of a superheterodyne audio receiver simultaneously. A modulated signal can be received or detected simultaneously on all channels of a receiving device that uses a superhet, regardless of the channel selected on the receiving device. This is useful in situations where it would be necessary to broadcast a message to a particular radio. For example, the Coast Guard could send important weather or emergency information to boats that may not be listening in to the Coast Guard's radio station. There are important applications for this technology in emergency alert situations, search and rescue, law enforcement, or air traffic control. Additional consumer applications may include making drive-in movie theater audio easier to tune in, event announcement for large spaces such as race tracks, broadcasting emergency vehicle sirens to car radios, and public announcements to cell phones in an area.
United States
Aug 29, 2017

Utility Patent
United States
Aug 22, 2017
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