Sunday, June 27, 2010

Is AOL Radio Going To Cause The Extinction Of Traditional Stations?

By Brian Fuller

Online radio such as AOL Radio, Slacker, Pandora and Last.fm have gained popularity lately. In addition, many wireless devices such as mobile phones support these platforms. Are local radio stations doomed? I will take a closer look at online radio to try to answer this question. In particular I will examine the impact of online radio on local broadcasters.

I appears that local radio stations are on their way to become extinct. They are being threatened by the advance of online and satellite radio. These competing services typically offer hundreds of music and entertainment channels. Some of the channels are even commercial-free. The internet has enabled access to a virtually unlimited number of online radio channels.

Pandora and other online radio services have become available of wireless audio devices by installing the appropriate app. This increases convenience and mobility of online radio. Mobility has thus far been the biggest advantage of local radio.

AOL Radio uses CBS radio as its broadcasting platform. It comes with over 200 music channels. In addition it offers access to more than 150 local CBS radio stations. The underlying CBS radio platform "play.it" also allows listeners to create their own customized music channels. This is done by entering the names of albums, tracks or artists. The tracks played on each music channels can also be stored on an iPod for later playback by using 3-rd party tool iGetMusic.

Pandora and other online radio services have similarly started to offer customize music. The user can enter music-related information such as artist, track or album name. These channels will then select tracks which are similar to the information entered. Thus far, however, competing music services have fallen short from offering similarly fully customized radio channels.

Does online radio mean the end of local radio? The growing number of options clearly is going to shrink the market share of traditional radio broadcasters. Online radio is particular useful for niche broadcasters who have been unable to broadcast due to the high cost and licensing of frequency space.

Online radio broadcasters have found it difficult to be profitable. The main reason is the huge number of competing channels which is diluting listeners. The lower cost of online radio at the same time allows creation of more appealing content than local radio by serving niche markets and inserting fewer commercials.

Local programming such as news and local events, however, will remain one of the big advantages of local radio. Thus far the poor audio quality of FM radio has been a big drawback. However, new digital radio broadcasts are set to improve the audio quality. One of these technologies is HD radio. Content and mobility will be crucial in determining the fate of online and local radio. Online radio offers a large number of choices while local radio excels by supplying local content. Both online and local broadcasts offer great mobility. Therefore it is hard to predict a clear winner in this radio battle.

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Tuesday, June 22, 2010

A Glance At Some Of The Coolest Wireless Toys

By Brian Fuller

Lately a large number of wireless audio products have emerged such as latest-generation wireless headphones, iPods, cell phones and wireless amplifier products which promise to cut the cord. I will take a look at some of the newest gadgets and technologies to find out how well they work and in which situations they work best.

Products can be categorized into products with built-in and those with optional wireless capability. Streaming audio products will often have a plug-in slot for adding a wireless LAN card. Latest generation iPods and cell phones already come with built-in WiFi and Bluetooth support.

The Bluetooth protocol is a fairly low-cost solution. However, its drawbacks have an impact on high-quality audio applications and are often overlooked.

1) Short range

Bluetooth normally only offers a 30 foot range. This is sufficient for single-room applications. However, this limitation does not allow multi-room streaming using Bluetooth.

2) Limited data transmission capacity

Bluetooth will apply audio compression since it does not reliably offer a high-enough data rate for uncompressed audio. Audio compression will degrade the audio quality to some extent. High-quality audio transmission typically does not tolerate this type of degradation. Therefore Bluetooth is normally not used in high-end audio products.

3) Audio latency

The signal transmitted via Bluetooth will undergo a slight delay of at least 10 ms. This is mostly due to the audio compression. While being uncritical for MP3 players, this delay may be a problem for video and other real-time applications.

4) Lacking multi-headphone support

Bluetooth does not support any number of headphones which may be a problem if you have a larger number of people who want to listen to headphones from a single transmitter device.

Uncompressed audio streaming is supported by WiFi. WiFi is a very common protocol. However, WiFi also has limitations in regard to simultaneous transmission to several receivers. Due to the high availability, WiFi is convenient for streaming audio from a PC. However, WiFi products have fairly high power consumption. For this reason wireless headphones typically do not use this technology.

While newest-generation wireless speakers and wireless amplifier products use proprietary digital technologies, entry-level products often still rely on FM transmission which is noisy and has high audio distortion and high susceptibility to radio interference.

More recent wireless audio protocols are based on digital transmission. This avoids audio degradation. Some protocols also incorporate error correction to deal with interference from other wireless devices.

Advanced wireless amplifier devices support uncompressed digital audio streaming to preserve the original audio quality. Some of these protocols allow streaming to an unlimited number of wireless amplifiers which is convenient for whole-house audio distribution. The audio latency ranges from below 1 ms to up to 20 ms. A small latency is important for wireless surround sound applications. These wireless audio transmitters typically work at 2.4 GHz. There are also some products such as Amphony's line of wireless audio products which work at 5.8 GHz. Products that operate at 5.8 GHz have less competition from other wireless devices than those using the crowded 2.4 GHz frequency band.

Wireless amplifiers are available with different levels of audio quality, power consumption and standby power. Having a high-quality low-distortion amplifier is vital for good sound quality. Digital Class-D amplifiers offer high power efficiency of at least 80%. They also have low standby power, typically less than 5 Watts. This reduces heat and keeps them cool during operation. Some digital amplifiers, however, have fairly high harmonic distortion. It is important to select a wireless amplifier with low audio distortion. This will ensure good sound quality. High-quality amplifiers have audio distortion of 0.05% or less.

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