Electroacoustic device basics Electroacoustic devices are devices that convert electrical and acoustic signals. They use electromagnetic induction, electrostatic induction or piezoelectric effects 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
Electroacoustic device basics Electroacoustic devices are devices that convert electrical and acoustic signals. They use electromagnetic induction, electrostatic induction or piezoelectric effects 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. The 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-representation, earbud-S, aircraft cap-F, tank cap-T, ship Use the call cap-J, the general work call cap-G. Second, the speaker classification speaker is an electroacoustic device that converts the 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 speaker, dome speaker, ribbon speaker, flat panel speaker. Classified by composition: single cone speaker, combination cone speaker, combination horn speaker, coaxial composite speaker. Classification by use: Hi-fi (home) speakers, monitor speakers, speakers for sound reinforcement, speakers for musical instruments, small speakers for receivers, and speakers for underwater use. According to the appearance classification: round speaker, elliptical 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, it is nonlinear distortion does not exceed Maximum input power under standard specification conditions (generally no more than 7-10%). The speaker should not be damaged for long-term operation at this normal power. 2. Nominal Impedance The impedance value specified by the manufacturer's product standard at which the speaker can obtain maximum power. 3. The input impedance of the resonant frequency speaker varies with 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 of the input 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 index indicating 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.
