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Фрагмент инструкции
Set the Mono/Stereo switch to ‘Stereo’. HMEC 306 and HMEC 306) You are receiving a mono source but the headset . Set the Mono/Stereo switch to ‘Mono’. Microphone output voltage set too high or too low Re-adjust the output voltage on the . To do so, use a small slotted screwdriver (see illustration on page 133) 137 Valuable information on NoiseGard™ The NoiseGard™ principle One of the greatest stress factors today is noise. Research has shown that noise the nervous system, and can cause tiredness, poor concentration, irritability Of even greater concern is the permanent damage to hearing that can at high levels. This problem concerns pilots in particular. Cockpit noise amounts and to 90 up to 97 dB(A) in turboprops. During takeoff and higher. To be able to understand radio traffic in spite of signal level must be set to at least 95 dB(A). Permanent continuous noise in aircrafts is the reason why many or lost their pilot.s license. Circumaural communication headsets provide commonly used to address this problem. headsets is uneven. High frequencies and engine noise, the most prominent little. A A In response to these problems, Sennheiser has developed an active noise compensation system – NoiseGard™ – which, combined with a high-quality passive hearing protector, provides consistent noise attenuation over the entire audio range. The overall noise is reduced so that the radio volume can be turned down but enough noise still for the pilot to safely monitor the aircraft engines. NoiseGard™ active noise compensation is achieved by generating a signal sound pressure level but exactly reversed in phase to the noise signal, the out-of-phase signal cancels most of the noise signal. Active noise compensation is accomplished in the following a microphone, a feedback control circuit, and a transducer communication and the noise cancelling signal. The feedback control microphones sense the total sound pressure within each earcup resulting from the receiver and the undesired noise that has microphone signal is amplified and the radio signal (noise) is then filtered and inverted and the entire signal is amplified and fed back component of the signal is inverted, The radio signal remains unaffected, circuits. The above diagram shows noise compensation with NoiseGardprotectors effectively attenuate noise from the middle effect decreasing sharply in the lower range. However, NoiseGard™ combined with passive hearing protectors approx. 25 dB in the 25–500 Hz frequency range. active and passive noise compensation is A 10 dB reduction in noise is perceived reduction in noise of 10 dB again Redel connector (NoiseGard™) 1 Power supply NoiseGard™ (DC+) 2 Audio Lo / DC – 3 Audio Hi left 4 Audio Hi right 5 Microphone Hi 6 Microphone Lo 12 3 1/ 4” (6.35 mm) stereo jack plug 1 Audio Hi left 2 Audio Hi right 3 Audio Lo 6 Connector assignment XLR-3 connector (NoiseGard™ ) 1 Power supply NoiseGard™ (DC+ ) 2 Ground 3 Do not connect! ........................................................ 1 234 U174/U jack plug 1 Microphone Lo 2 Audio Hi 3 Microphone Hi 4 Audio Lo 42 1 3 solder side 5 XLR-5 connector HMEC 305 HMEC 305-C 1 Audio Hi 1 Audio Hi 2 Audio Lo / DC – 2 Audio Lo 3 Microphone Hi 3 Microphone Hi 4 Microphone Lo 4 Microphone Lo 5 Power supply Noi...
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