The noise process appearing at the output of such a filter is called narrowband noise. 3. With the spectral components of narrowband noise concentrated about. NARROWBAND NOISE (NBN). ○ Filters at the receiver have enough bandwidth to pass the desired signal but not too big to pass excess noise. ○ Narrowband. The goal of this study was to evaluate the effect of narrow-band noise on increment detection in an effort to understand the decision processes used in increment.


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Accordingly, and have the same average power.

A slope network or differentiator with a purely imaginary frequency response that varies linearly with frequency. It produces a hybrid- modulated wave in which both narrow band noise and frequency vary in accordance with the message signal.

An envelope detector that recovers the amplitude variation and reproduces the message signal.

Active Suppression of Narrowband Noise by Multiple Secondary Sources

narrow band noise At and below this breakdown point, Eq. The detection of DSB-SC with a linear coherent receiver has the same SNR performance as the baseband reference model but requires synchronization circuitry to recover the coherent carrier for demodulation.

Non-suppressed carrier AM narrow band noise allow simple receiver design including the use of envelope detection, but they result in significant wastage of transmitter power compared to coherent systems. This type system, be it analog or digital.

Journal of Sensors

Narrow band noise Noise is a general term which is used to describe an unwanted signal which affects narrow band noise wanted signal. These unwanted signals arise from a variety of sources which may be considered in one of two main categories: This approach is known as an active sound quality control ASQC and it can be implemented by incorporating some factors in its algorithm.


A typical ASQC system, therefore, needs to have a capability of attenuating unwanted noise to a certain level and, at the same time, of enhancing wanted noise to a predefined target narrow band noise. An adaptive noise equalization ANE is one of the concepts and has been extending to control narrowband and broadband noises [ 5 — 8 ].

Although a narrowband ANC system can reduce narrowband noise components at maximum, a narrowband ANE system can be independently manipulated. The duct systems are widely applied to a number of different buildings, factories, and facilities.

In some applications, such as clean rooms for precise manufacturing, they need to keep a comfortable noise level for workers and this leads to product quality. Also excessive reduction of noise can cause uncomfortable awkward silence.

Thus the quality factor allows operating the noise reduction level with the ANC narrow band noise. In this study, thus, an active sound quality control ASQC system using this ANE algorithm based the FxLMS is investigated in depth in order to control narrowband noise, which are dominant in a duct, separately or altogether in terms of sound quality control.

For the selective quality control, a quality factor or parameter which is narrow band noise is applied in the real-time FxLMS adaptive algorithm.

The effect of narrow-band noise maskers on increment detection

The rest of the paper is organized as follows. In Section 2theoretical considerations are described to derive proper equations for sound quality control based on the multichannel FxLMS algorithm with narrow band noise quality factor matrix in a duct. Section 3 presents the experimental arrangement including the test duct and control board for the real-time control.

Another key finding was that AM at a distant carrier frequency interfered with increment detection.


This result is in contrast to results from Glasberg et al.