A Glimpse At A Few Of The Hottest Wireless Gadgets
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 examine whether or not these products keep their claim to deliver perfect-quality audio. Also, I will take a look at the underlying technologies.
Several products come with wireless already built in while some others, particularly streaming audio products, often have optional wireless capability. Newer cell phones and MP3 players already come with support for wireless. iPhones and touch-screen iPods, for instance, have Bluetooth and WiFi.
Bluetooth is a fairly low-cost option but has some drawbacks which are frequently ignored.
1) Short range
Bluetooth generally just provides a 30 foot range. This is adequate for single-room applications. Yet, this limiting factor does not permit multi-room streaming using Bluetooth.
2) Audio compression resulting from limited data rate
Bluetooth reliably supports data transmission rates of roughly 1 Mbps only which is not enough for uncompressed CD-quality audio. For that reason Bluetooth utilizes audio compression. This is less critical however for compressed audio such as MP3 audio but excludes Bluetooth from use in high-quality audio applications.
3) Audio delay
The signal sent via Bluetooth will bear a slight delay of a minimum of 10 ms. This is mostly as a result of 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 is relatively restricted regarding supporting streaming to multiple headphones. Streaming to numerous headphones is useful for numerous people wanting to listen to the same transmitter. This is less of a dilemma for MP3 player applications.
WiFi is an additional commonly used wireless protocol that is also suitable for audio streaming. WiFi does support uncompressed audio but will have limitations broadcasting to a high number of wireless receivers at the same time. It is convenient for streaming music from a PC because of the high availability but is generally not utilized in wireless headphone devices as a result of the fairly high power consumption of WiFi.
Home wireless speaker devices and wireless amplifiers typically use proprietary protocols. These protocols are especially engineered for real-time audio applications. However, low-cost wireless speakers and headphones still use FM transmission. FM transmission suffers from rather high audio distortion and hiss / static.
More advanced wireless protocols are based on digital formats which eliminate audio degradation and incorporate sophisticated features like error correction to cope with interference from competing wireless devices.
Latest-generation wireless amplifiers utilize uncompressed audio transmission. New protocols also permit streaming to an unlimited number of receivers. This enables whole-house audio distribution.
The audio latency ranges from below 1 ms to up to 20 ms. A small latency is vital for wireless surround sound applications. Typically newer generation wireless audio transmitters will operate at 2.4 GHz. Some transmitters, including Amphony's line of devices, operate at the less crowded 5.8 GHz frequency band.
These wireless amplifiers also differ in regard to amplifier output power, standby power consumption and audio quality. A high-quality audio amplifier is fundamental for optimum sound quality. Digital Class-D amplifiers offer high power efficiency of no less than 80%. They also have low standby power, generally less than 5 Watts. This minimizes heat and keeps them cool during operation. Some digital amplifiers, however, have relatively high harmonic distortion. Selecting a low-distortion amplifier is essential. Good-quality wireless amplifiers have audio distortion of less than 0.05%.
by: audiogadgets
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