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Acoustical Measurement And Instrumentation. Acoustical measures are widely acknowledged as precise and well-defined methods for determining noise and sound quality standards Acousticians can now contribute to structural vibration, machine diagnostics, product development, quality control on machines and products in general, condition monitoring, and other fields by using intensity measuring techniques and calibration procedures Acoustic transducers and techniques are used for gas analysis, medical diagnostics, and many other fields..

Microphone. This paper focuses on the experimental assessment of vacuum cleaner noise and evaluates their psychoacoustic matrices The vacuum cleaner is one of the most frequently used home appliances, generating unpleasant noise during operations The noise is mainly emitted from the built-in suction units of the vacuum cleaners, exhaust fan, airflow, and the surface vibrations during the operation. The suction unit generally consists of a driving electric motor and a centrifugal blower. A vanned diffuser is installed in the hose in some equipment to achieve a high-pressure rise during the operation..

Frequency Response. From 2 Hz to a size-dependent upper limit, the frequency response characteristics of good grade vacuum cleaners are typically flat. This limit is roughly 2 kHz for a 1" diameter microphone, 4 kHz for a 1/2" microphone, and 8 kHz for a 1/4" microphone.

Vacuum Cleaner. A vacuum cleaner is an appliance that uses airflow caused by negative pressure within the device to remove soil from a surface to be cleaned. A vacuum cleaner with a fixed or at least one detachable nozzle designed for cleaning both carpets and hard floors,.