NoiseGard™ active noise compensation is achieved by generating a signal identical in sound pressure level but exactly reversed in phase to the noise signal, the effect being that the out-of-phase signal cancels most of the noise signal.

Active noise compensation is accomplished in the following manner: Each earcup includes a microphone, a feedback control circuit, and a transducer to reproduce both the communication and the noise cancelling signal. The feedback control microphones sense the total sound pressure within each earcup resulting from both the desired radio signal from the receiver and the undesired noise that has come through the earcup. The microphone signal is amplified and the radio signal is subtracted from it. The remaining signal (noise) is then filtered and inverted and the radio signal is added back in. Eventually, the entire signal is amplified and fed back to the transducer in each earcup. Since the noise component of the signal is inverted, it cancels the noise signal coming through the earcup. The radio signal remains unaffected, as it was not processed through the cancellation circuits.

The diagram on the left shows noise compensation with NoiseGard™: Passive hearing protectors effectively attenuate noise from the middle and upper frequency range, the effect decreasing sharply in the lower range. However, active noise compensation with NoiseGard™ combined with passive hearing protectors results in a reduction of noise of approx. 25 dB in the 25–500 Hz frequency range. The total attenuation resulting from active and passive noise compensation is about 30 dB over the entire audio range.

A 10 dB reduction in noise is perceived subjectively as a halving in volume. A further reduction in noise of 10 dB again results in a decrease in unwanted noise by 50 %.

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Sennheiser SH350 manual
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SH350 specifications

The Sennheiser SH350 is a professional-grade headset designed for those who prioritize high-quality audio and comfort in demanding environments. Known for its robust construction and excellent sound performance, the SH350 is ideal for professional users, including call center agents, broadcasters, and musicians.

One of the standout features of the SH350 is its exceptional sound quality. Equipped with advanced Neodymium magnets, the headphones deliver rich bass, clear mids, and crisp highs, making them suitable for various audio applications, from voice calls to immersive music listening. The wide frequency response ensures that users experience every detail in their audio, enhancing overall clarity and performance.

The SH350 offers passive noise isolation, which significantly reduces ambient sounds, allowing users to focus on their audio content without external distractions. This feature is especially beneficial in noisy environments, helping users to maintain clear communication or enjoy music without interruption.

Comfort is another key characteristic of the Sennheiser SH350. The headset is designed with padded ear cups and an adjustable headband, ensuring a secure yet comfortable fit for extended periods of use. The lightweight design helps reduce fatigue, making it an excellent choice for long calls or listening sessions.

In terms of technology, the SH350 features a flexible, noise-canceling microphone that ensures crystal clear voice transmission. This is particularly important for professional users who need their voice to be clearly heard during calls or broadcasts. The microphone can be easily adjusted to the optimal position, enhancing both comfort and audio clarity.

The headset is also equipped with a durable and reliable cable, ensuring a stable connection to various devices. Compatible with a wide range of platforms, including computers, tablets, and smartphones, the Sennheiser SH350 is versatile and user-friendly, catering to the needs of various professionals.

In summary, the Sennheiser SH350 is a well-rounded headset that combines superior sound quality, passive noise isolation, exceptional comfort, and advanced microphone technology, making it an excellent choice for anyone seeking a professional audio solution. Whether for communication in a busy office or listening to music on the go, the SH350 delivers an impressive performance tailored to meet the demands of users across different fields.
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