Method and apparatus for synchronized transmission and reception of data in a digital audio broadcasting system
First Claim
1. A receiver for receiving digital audio broadcasting signals comprising:
- an antenna for receiving at least three in-band on-channel digital audio broadcasting signals transmitted by at least three transmitters, each of the digital audio broadcasting signals comprising a plurality of modem frames of different information, wherein each of the modem frames includes information from which absolute time relative to a start of the modem frame can be derived and includes data identifying a location of one of the transmitters; and
a processor for determining a time difference of arrival between the modem frames in the received digital audio broadcasting signals and for using the time difference of arrival and the location data to estimate a location of the receiver, wherein the receiver scans the digital audio broadcasting signals and the processor advances local time through a clock to derive relative signal timing for determining the time difference of arrival.
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Accused Products
Abstract
A method of transmitting digital audio broadcasting signals comprises the steps of generating a plurality of output frames of information to be transmitted, wherein each of the output frames includes a plurality of blocks of data and each of the output frames is synchronized with an absolute time reference, and transmitting the output frames to a plurality of receivers. Transmitters that broadcast in accordance with the method and receivers that receive the transmitted signal are also disclosed. A method is also provided for receiving digital audio broadcasting signals comprising the steps of receiving a digital audio broadcasting signal comprising a plurality of output frames of information, wherein each of the output frames includes a plurality of blocks of data and each of the output frames is synchronized with an absolute time reference, and determining the start of each output frame relative to an absolute time reference.
60 Citations
13 Claims
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1. A receiver for receiving digital audio broadcasting signals comprising:
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an antenna for receiving at least three in-band on-channel digital audio broadcasting signals transmitted by at least three transmitters, each of the digital audio broadcasting signals comprising a plurality of modem frames of different information, wherein each of the modem frames includes information from which absolute time relative to a start of the modem frame can be derived and includes data identifying a location of one of the transmitters; and a processor for determining a time difference of arrival between the modem frames in the received digital audio broadcasting signals and for using the time difference of arrival and the location data to estimate a location of the receiver, wherein the receiver scans the digital audio broadcasting signals and the processor advances local time through a clock to derive relative signal timing for determining the time difference of arrival. - View Dependent Claims (2, 3, 4, 5)
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6. A method for receiving digital audio broadcasting signals comprising the steps of:
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using an antenna to receive at least three in-band on-channel digital audio broadcasting signals transmitted by at least three transmitters, each of the digital audio broadcasting signals comprising a plurality of modem frames of different information, wherein each of the modem frames includes information from which absolute time relative to a start of the modem frame can be derived and includes data identifying a location of one of the transmitters; and using processing circuitry to determine a time difference of arrival between the modem frames in the received digital audio broadcasting signals and using the time difference of arrival and the location data to estimate a location of the receiver, wherein the digital audio broadcasting signals are scanned and the processing circuitry advances local time through a clock to derive relative signal timing for determining the time difference of arrival. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification