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Method and apparatus for formatting signals for digital audio broadcasting transmission and reception

A technology for digital audio broadcasting and transmitters, applied in digital audio broadcasting, shaping networks in transmitters/receivers, broadcasting information features, etc.

Inactive Publication Date: 2010-07-14
IBIQUITY DIGITAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bandwidth of existing analog FM signals is significantly smaller than that occupied by OFDM subcarriers

Method used

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  • Method and apparatus for formatting signals for digital audio broadcasting transmission and reception
  • Method and apparatus for formatting signals for digital audio broadcasting transmission and reception
  • Method and apparatus for formatting signals for digital audio broadcasting transmission and reception

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Embodiment Construction

[0036] With reference to the accompanying drawings, figure 1 is a functional block diagram of the transmitter 10 used in the digital audio broadcasting system. The transmitter comprises an input 12 for receiving the main program service audio signal, an input 14 for receiving station identification service data, and an input for receiving the main program service data, supplementary program service data and auxiliary application service data 16. For hybrid DAB, an analog version of the main program service audio signal is delayed by block 18 to produce a delayed analog audio signal on line 20 . Audio subsystem 22 encodes and compresses the main program service audio signal to produce an encoded compressed digital signal on line 24 . Transport and service multiplexing subsystem 26 receives encoded compressed digital signals, station identification service data, main program service data, supplemental program service data, and ancillary application service data on line 24 and ...

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Abstract

A method for digital audio broadcasting comprising the steps of receiving a plurality of data bits to be transmitted, formatting the plurality of data bits into a plurality of protocol data units, inserting header bits at spaced locations within the protocol data units, and using the protocol data units to modulate a plurality of carriers to produce an output signal. The individual header bits can be positioned at evenly spaced locations in the protocol data units. A first one of the header bits can be offset from an end of the protocol data unit. A method of receiving the digital audio broadcasting signal the transmitters and receivers that operate in accordance with the methods are also provided.

Description

technical field [0001] The present invention relates to in-band channel (IBOC) digital audio broadcasting (DAB), and in particular to methods and apparatus for formatting signals for DAB transmission and reception. Background technique [0002] The IBOC DAB system is designed to allow a smooth evolution from the current analog amplitude modulation (AM) and frequency modulation (FM) radio system to an all digital in-band channel system. These systems are capable of delivering digital audio and data traffic from terrestrial transmitters to mobile, portable, and fixed receivers over existing medium frequency (MF) and very high frequency (VHF) radio frequency bands. Broadcasters can take advantage of the new, higher quality and more stable digital signal to continue sending analog AM and FM signals simultaneously, allowing the transition from analog to digital radios while maintaining current frequency allocations. [0003] Digital Audio Broadcasting (DAB) is capable of providi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/04H04B15/00H04H20/30H04L25/03H04L27/26
CPCH04H2201/20H04H20/95H04H20/30H04L25/03866H04L27/2601H04H2201/183H04L27/04H04B15/00
Inventor 马莱克·米尔巴尔詹姆斯·C·斯特卡斯
Owner IBIQUITY DIGITAL CORP