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The celesta (/ s ɪ ˈ l ɛ s t ə /) or celeste (/ s ɪ ˈ l ɛ s t /), also called a bell-piano, is a struck idiophone operated by a keyboard. It looks similar to an upright piano (four- or five- octave ), albeit with smaller keys and a much smaller cabinet, or a large wooden music box (three-octave).
The celestaphone was a musical instrument of the zither family, which was played by pressing spring-levers to cause small hammers to strike the strings of the instrument.. The term celestaphone was also used for a glass-plate xylophone designed by Charles C. Weidman of Ohio State University around the 1930s. [1]
The celesta (at least the modern one) have only 1 sound plate per note. Perhaps the typophone was a forerunner of C.V Mustel's "celesta", but if Auguste invented anything it was maybe an improvement of his father's device (removed one of the sound plates per note). Later patents issued to Mustel and co refer to "Orgue celesta".
Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal.
This is a partitioned list of percussion instruments showing their usage as tuned or untuned. See pitched percussion instrument for discussion of the differences between tuned and untuned percussion.
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An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more.
Audiometry (from Latin audīre 'to hear' and metria 'to measure') is a branch of audiology and the science of measuring hearing acuity for variations in sound intensity and pitch and for tonal purity, involving thresholds and differing frequencies. [1]