01-06-2012, 11:02 AM
IN BAND ON CHANNEL DIGITAL BROADCASTING
ABSTRACT
In- Band On- Channel (IBOC) technology is a method of transmission of digital and analog radio broadcast signals at the same time at the same frequency. Using the available additional side bands the digital information is subjected to multiplexing on an FM/AM analog signal. This compensates for the problem of re- allocation of the broadcast bands. But the adjacent channel interference increases due to the existence of RF power or RF energy outside the already defined channel. It makes the additional bandwidth available by borrowing some existing subcarriers from the air. The technology also allows multi-program channels. Audio program broadcasting, traditionally an analog service using either amplitude or frequency modulation (AM or FM), is rapidly evolving to digital methods. Digital audio broadcasting (DAB) promises to bring to listeners an audio signal with vastly improved characteristics, accompanied by additional digital data-based services not available from the analog signals now in use.
The greatest advantage of IBOC is its ease of implementation. Almost all the major broadcast equipment manufacturers are now implementing IBOC technology. The Digital Audio Broadcasting (DAB) is having an issue with the downgrading stations to include more and more channels in to the available limited range. The primary advantages of IBOC DAB when compared to a new-band DAB system, such as Eureka-147, is that an IBOC DAB system i) does not require a new frequency allocation, ii) makes use of the existing independent broadcast infrastructure, and iii) facilitates a gradual migration from conventional analog FM-band broadcast towards an all digital broadcast radio system. This article discusses the in-band/on-channel approach to implementing terrestrial digital audio broadcasting.
ABSTRACT
In- Band On- Channel (IBOC) technology is a method of transmission of digital and analog radio broadcast signals at the same time at the same frequency. Using the available additional side bands the digital information is subjected to multiplexing on an FM/AM analog signal. This compensates for the problem of re- allocation of the broadcast bands. But the adjacent channel interference increases due to the existence of RF power or RF energy outside the already defined channel. It makes the additional bandwidth available by borrowing some existing subcarriers from the air. The technology also allows multi-program channels. Audio program broadcasting, traditionally an analog service using either amplitude or frequency modulation (AM or FM), is rapidly evolving to digital methods. Digital audio broadcasting (DAB) promises to bring to listeners an audio signal with vastly improved characteristics, accompanied by additional digital data-based services not available from the analog signals now in use.
The greatest advantage of IBOC is its ease of implementation. Almost all the major broadcast equipment manufacturers are now implementing IBOC technology. The Digital Audio Broadcasting (DAB) is having an issue with the downgrading stations to include more and more channels in to the available limited range. The primary advantages of IBOC DAB when compared to a new-band DAB system, such as Eureka-147, is that an IBOC DAB system i) does not require a new frequency allocation, ii) makes use of the existing independent broadcast infrastructure, and iii) facilitates a gradual migration from conventional analog FM-band broadcast towards an all digital broadcast radio system. This article discusses the in-band/on-channel approach to implementing terrestrial digital audio broadcasting.