News Release from: Head Acoustics
Edited by the Electronicstalk Editorial Team on 14 January 2005
System tests hands-free kits to new standard
The new VDA quality standard for car hands-free terminals can be qualified using the Acqua communication analysis system and the HMS artificial head measurement system.
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The demand for high-quality car hands-free terminals has risen considerably since they became a legal necessity. The German Association of the automotive industry (VDA) has reacted to this situation and established a new specification for ensuring speech quality in hands-free terminals. The VDA enlisted the help of the communications measurement experts at Head Acoustics, who had already been involved in defining other German and international telecommunication standards, to codevelop the specification.
This has now been implemented into a new quality standard that can be qualified using the company?s Acqua communication analysis system and the HMS artificial head measurement system.
The VDA specification comprises numerous standard values such as loudness rating, transfer function, idle channel noise in sending and receiving direction, cancellation of out-of-band signals, echo attenuation and minimum activation levels.
In contrast to other commonly used standards, the VDA specification also takes into account four other essential aspects.
It takes account of car model-specific conditions by measuring the hands-free terminal in its original mounting state.
For retrofit solutions it uses a car cabin with typical acoustic characteristics.
The standard tests both in a 'tranquil' state and with realistic background noise, with acoustic driving simulation equalised to target car.
And it takes consideration of different speeds, engines and body styles.
The artificial head measurement system acts as the 'user' of the hands-free terminal, with a primary focus is on conversation parameters such as quality during double talk and quality of background noise transmission.
Some of the tests are based on current standards for the third generation of mobile telephones such as 3GPP, others on the results of auditory methods (another improved aspect of the VDA specification compared with commonly used standards).
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