DIGITAL RADIO GUIDE

TERRESTRIAL TRANSMISSION SYSTEMS - HD RADIO

4.4iBiquity HD Radio System

The HD Radio system developed by US-based iBiquity Digital was designed for regions where limited spectrum prevents the allocation of new frequencies for digital broadcasting. The HD Radio system allows broadcasters to simultaneously transmit an analogue and digital signal without the need for additional spectrum for the digital signal. The HD Radio system takes advantage of unused portions of the spectrum on either side of the analogue carrier (as defined by the service frequency allocation “mask”) and implements frequency re-use by including digital carriers in quadrature to the existing analogue carrier. In either case, the analogue signals are in close proximity to the digital signals and great care must be taken to prevent unwanted interference between them.

The HD Radio system is designed to work in hybrid mode (compatible analogue and digital) as well as to migrate to an all-digital system once analogue radios have been largely replaced in the future. See Figures 4.10, 4.11, and 4.12.

The HD Radio system offers a number of advantages for broadcasters, consumers and regulators. The HD Radio system replicates the existing coverage patterns of each radio station thereby retaining the existing economic value of the station. Broadcasters can convert to digital broadcasts with a relatively modest investment and retain the vast majority of their existing physical plant. In addition, the introduction of the digital signal in the existing channel allows the broadcaster to retain the station’s existing dial position. Because the system supports simulcast of the analogue and digital signals, consumers are able to upgrade to digital over an extended period, taking into account normal equipment replacement cycles. Regulators benefit because there is no need for spectrum allocations or licensing of new stations. However, many countries are cautious about IBOC technology because it has the potential in certain circumstances to cause some degradation to existing analogue services, particular at the edge of the existing analogue service area.

The HD Radio system offers the following features:

•CD quality audio in the FM-band and FM quality stereo audio in the AM band.6

•Digital coverage nearly equivalent to existing analogue coverage. In areas where the digital signal is lost, the system automatically blends to the analogue back-up signal to ensure coverage is never less than existing coverage.

•Advanced coding technologies and time diversity between the analogue and digital signals ensure a robust signal.

•The FM system has demonstrated significant robustness in the presence of severe multipath, and the AM system has demonstrated significant robustness in the presence of impulse noise.

•The FM system offers options for introducing new data services ranging from 1 to 300 kbps depending on the mode of operation.

The HD Radio system has been tested in North and South America. It is currently in operation in approximately 250 stations throughout the United States and is expected to be in use by approximately 650 stations by the end of 2005.

6See the Report of the National Radio Systems Committees, DAB Subcommittee Evaluation of the iBiquity Digital Corporation System Part 1 – FM IBOC, November 29, 2001 (“FM NRSC Report”) and Part 2, AM IBOC, dated April 6, 2002 (“AM NRSC Report”).

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Grundig Digital Radio manual IBiquity HD Radio System
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Digital Radio specifications

The Grundig Digital Radio represents a significant advancement in radio technology, combining aesthetics, functionality, and a user-friendly interface. As a pioneer in the audio and electronics industry, Grundig has successfully integrated modern digital capabilities into its traditional radio design, appealing to both nostalgic listeners and tech-savvy users.

One of the standout features of the Grundig Digital Radio is its versatility in reception. With DAB+ (Digital Audio Broadcasting) technology, users can enjoy a wide array of radio stations with superior sound quality, free from the hiss and interference commonly associated with analog broadcasts. The inclusion of FM and AM bands ensures that listeners are not limited, providing access to local stations that may not yet have transitioned to digital.

The Grundig Digital Radio is designed with ease of use in mind. Its intuitive interface, often featuring a clear LCD display, allows users to navigate through stations and settings effortlessly. Many models also include a built-in tuner that automatically scans and presets available stations, simplifying the setup process. For those who appreciate personalization, some variants come equipped with customizable presets, allowing users to save their favorite stations for quick access.

Portability is another key characteristic of the Grundig Digital Radio. Many models are lightweight and come with built-in handles, making them ideal for on-the-go listening, whether it's in the garden, on the beach, or during a picnic. Battery options, alongside mains power, ensure that users can take advantage of their radios wherever they choose.

In terms of sound quality, Grundig utilizes advanced audio technologies to deliver rich and clear sound. Enhanced bass responses and treble controls allow users to fine-tune their listening experience to match their preferences. Furthermore, many models feature additional inputs, such as AUX and USB ports, enabling users to connect their smartphones or other devices, expanding their audio options.

Other notable characteristics include built-in alarms and timers, which make the Grundig Digital Radio a versatile companion for daily routines. Some models even support Bluetooth connectivity, allowing for seamless streaming from a variety of devices.

In summary, the Grundig Digital Radio embodies the perfect blend of traditional radio appeal and modern digital technology, offering versatility, ease of use, superior sound quality, and portability to meet the diverse needs of today’s listeners. Its well-thought-out features and user-friendly design make it an excellent choice for anyone looking to enhance their audio experience.
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