DIGITAL RADIO GUIDE

INTERNET RADIO

The streaming system architecture comprises four elements: capture and encoding, serving, distribution and delivery and media player.

Capture and encoding takes the source audio from the microphone and exports it into a compressed (encoded) computer file. These files are stored on a content server which controls the real-time delivery of the stream. The distribution channel (usually the Internet) connects the server to the player. The media player renders the media on the PC or another device (hand-held wireless devices, games consoles, interactive TV, etc).

As Internet is overlaid on telecommunications infrastructure, IR is now widely available via a variety of two-way communication networks, both wired and wireless. narrow-band (dial-up) at home and broadband connections in offices, via WLAN hot spots in airports, congress centres and other public places. The number of listening hours is staggering.

Broadband access is obviously a big plus and some of the streams are so good you can enjoy them over your home stereo system.

IR services can be delivered in a variety of configurations ranging from direct server- client to podcasting.

(1)Server-client

Unicasting is a classical approach to radio streaming. Requests from clients (users) to receive a stream are managed by a server or a cluster of servers. In case of clustering, load balancing is used to improve reliability of the stream delivery, especially if one of the servers breaks down. The server cluster feeds a common Internet line used to transmit the streams to the clients. The total bandwidth provided by such a server farm is proportional to the number of clients and the bitrate of streams. This means that doubling the number of clients or bitrate will double the system capacity and cost.

Unicasting also has a "scaling" problem. Since all the streams are transmitted to the Internet from one source, a server quickly reaches its upper capacity limit, resulting in a "server busy" message.

(2)Distribution networks

The Content Delivery Network (CDN) consists of a large number (typically several thousand) of "edge"14 servers situated around the world. Each server uses the same home page and is uploaded with the same content. The user gets content from the nearest server, so that the access delay is minimal. The CDN approach distributes the load among the geographically separated servers and increases the possible number of concurrent requests and streams that may be handled. The CDNs can potentially cater to several thousand simultaneous streams but are very costly. For example, Akamai's globally distributed edge computing platform comprises more than 15,000 servers in more than 1,100 networks in 70 countries.

14The word "edge" is used here to mean "close to the user".

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Grundig Digital Radio manual Server-client, Distribution networks
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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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