Electroacoustic device naming method, classification, parameters

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Electroacoustic device naming, classification, parameters

Electroacoustic device Electroacoustic device refers to a device that converts electrical and acoustic signals. It uses electromagnetic induction, electrostatic induction or piezoelectric effect to complete electroacoustic conversion, including speakers, headphones, microphones, and cartridges.
First, the model naming method Model name composition items and arrangement order Speaker: main name - classification - radiation form - shape - power - serial number microphone: main name - classification - level - serial number to send, receiver: main name - classification - serial number - Impedance microphone, earphone: main name - serial number - impedance assembly: main name - serial number - combination form main name in the main name and representative symbol correspondence: speaker - Y, speaker group - YZ, pass poetry, microphone - C, microphone group -CZ, microphone-O, receiver-S, flower-cartridge-H, earphone-E, earphone hub-EH.
Correspondence between the name and the representative symbol in the classification: electromagnetic-C, electric, moving coil-D, piezoelectric-Y, electrostatic, capacitive-R, carbon-type-T, aluminum-belt-A, contact- J, differential pressure type -C, pressure type - not indicated.
Correspondence between name and representative symbol in radiation form, shape and use: horn-H, elliptical-T, round-not indicating, earbud-S, aircraft cap-F, tank cap-T, ship Use the call cap -J, general work call cap -G.

Second, the speaker classification speaker is an electroacoustic device that converts audio current into sound. The speaker is commonly called a speaker, and there are many types.
Classified by energy: electric (dynamic) speakers, electromagnetic speakers, electrostatic (capacitor) speakers, piezoelectric (crystal) speakers, discharge (ion) speakers.
Classified by radiation: cone (direct radiant) speaker, horn (indirect radiant) speaker.
Classified by diaphragm: cone speakers, dome speakers, ribbon speakers, flat panel speakers.
Classified by composition: single cone speaker, combination cone speaker, combination horn speaker, coaxial composite speaker.
Classified by usage: high-fidelity (home) speakers, monitor speakers, speakers for sound reinforcement, speakers for musical instruments, small speakers for receivers, and speakers for underwater use.
Classified by appearance: round speaker, oval speaker, cylindrical speaker, rectangular speaker.

Third, the main characteristics of the speaker parameters
1. Nominal power nominal power, also known as rated power or undistorted power, is the maximum input power under nonlinear distortion that does not exceed the standard specification conditions (generally not exceeding 7-10%). The speaker should not be damaged for long-term operation at this normal power.
2. The impedance value specified by the nominal impedance manufacturer's product standard, at which the speaker can obtain maximum power.
3. The input impedance of the resonant frequency speaker varies with the frequency. The speaker has the maximum input impedance at a certain frequency of the low frequency. This frequency is called the resonant frequency fo. The resonant frequency is related to the vibration system of the speaker. The quality of the vibration system The larger the paper cone and the centering piece are, the lower the resonance frequency is.
4. Sensitivity When the power input to the speaker is 1W, the average sound pressure measured at one meter on the axis.
5. The directional radiation of the directional loudspeaker is different in different directions. The indicator of this performance is called radiation directivity. The directivity is related to the frequency. The radiation directivity of the loudspeaker is enhanced with the increase of frequency, generally at 250-300 Hz. Below, there is no obvious directivity.

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