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The DECT frequencies and DECT frequency bands are normally allocated to DECT technology. The most common DECT frequencies are from 1880 - 1900 MHz. This DECT frequency allocation is the most widespread and used in Europe. This DECT spectrum is unlicensed and technology exclusive, and this ensure ensures almost interference free operation.
Almost everyone can play or sing middle-C. frequency-As stated above, when air waves occur in repeated patterns, hundreds of times a second, then humans hear the waves as having pitch. For example, if you play middle-C on the piano you will be creating air waves that repeat 262 times per second. The frequency of a sound is the exact number of times per second that a wave is repeated. Higher pitches will have higher frequencies. The most important frequency to know is A-440. This is the primary reference pitch (designated with the letter A) or frequency (440 times per second) which is used to tune instruments. You will hear the oboe play a note of A-440 when an orchestra tunes before playing.