<P>答案有了:</P><P>Here is a summary of the main points :
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The French decree will become mandatory around the 10/05/06.
Any produc sold after that date will have to be compliant.
As far, this is a french law with no impacts on other European Union countries.
Main points:
1) Acoustic pressure limited to 100 dBSPL
2) Output voltage of the player limited to 150 mV to keep safe with any kind of headset
3) Conformity declaration requested. Content:
- Signatory name and adress
- Commercial brand name, device type and and general description
- Technical information on how to meet decree requests
(- List of headset models compatible with point 1)
4) Mention on the user manual:
- Of the potential use risks and the best way to avoid them
- Of the list of headset models compatible with maximum power restriction
5) Lisible and irremovable mention on the device: "A pleine puissance, l'écoute prolongée du baladeur peut endommager l'oreille de l'utilisateur"
If there is no available surface bigger than 4 square centimeters, a drawing can be used.
The packaging and the user manual have to contain both the drawing and mention. </P>
rench acoustic decree 为保护安全而设定, 规定耳机输出孔输出电压不得大于150mV, 声压值不得大于100dB SPL.
有兴趣可以参考以下之测试方法:
1. Equipment of test
The levels of acoustic pressure restored by the ear-phones are evaluated by means of a simulator of head and chest (STT) in conformity with recommendation CEI 959 (*) and equipped with simulators of auditory canal and occluded ear (NF C 97-611 *).
2. Signal of test
Noise of simulation of program in conformity with standard NF C 97-301 (*) (peak factor 2 ý 0,2) must be used as signal of test.
For the cassette players, the level of recording is of - 6 dB réf. 250 nWb/m.
For the systems audio-numétriques, the level of recording is of - 10 dB réf. EP (full scale).
For the radio operator receivers with frequency modulation, the conditions of emission are in conformity with recommendation CEI 315-1 (*) and to standard NF C the 92-310 (*). signal of test is regulated with - 6 dB in effective value, compared to a sinusoidal signal with 250 Hz producing a deviation from more or less 75 Khz.
3. Conditioning of the walkmans submitted for testing
The nominal voltage of power supply of the walkmans is provided by a stabilized power supply (with a tolerance of ý 3 %).
The adjustments of tonality and dynamics are positioned so as to obtain the maximum level of exit.
4. Measuring equipment
The measuring equipment must be in conformity with standard NF IN 60 804 (*), class 1.
5. Determination of the level of acoustic pressure maximum
The level of acoustic pressure maximum is expressed by the continuous level are equivalent balanced A (LAeq) of the signal delivered by the microphone over a time of integration of at least a minute.
The levels of acoustic pressure are corrected response in "free field" specific to STT used.
The ear-phone is positioned so as to obtain the maximum level; the tests are repeated five times for each ear-phone.
The level of acoustic pressure maximum retained is the arithmetic mean of the 10 balanced levels of acoustic pressure A measured.
(*) Or any other standard equivalent or regulation used in other Member States of the European Union or in one of the contracting Left EFTA countries to the agreement instituting the European economic Area.[br]<p align=right><font color=red>+5 RD币</font></p>
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发表于 2006-3-15 10:22:00
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