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interpretation of specification: Watt, Decibel, Hertz, and Resonance
- W ( Watt ): A watt
= a voltage x an ampere. For example, 330 Watt= 110V x 3 A.
- V ( Volt ): V is
the unit of voltage, when it needs one joule of work to sent one
coulomb of electric from one point to another point, then the
potential difference between these two points is one voltage.
- Ohm: Ohm is the unit
of impedance in electronics, the higher the impedance is, the
less electric current can pass through.
- Hz( Hertz): The frequency
of the sound waves vibrate every second. For instance, 100Hz means
100 times vibration in one second.
- dB ( Decibel): dB
is the unit of the sound pressure level, which is calculated with
logarithm, because the susceptibility to the sound of human ears
is not linear.
- Fo ( Resonance Frequency):
Fo stands for the resonance point of the speaker. The lower the
Fo is, the efficiency of the low frequency is better.
- S.P.L. ( Sound Pressure
Level): The volume of the sound.
- Vo-p: The measurement
from Vo to the peak, to drive the magnetic buzzer, the waveform
is 1/2 square wave.
- Vp-p: The measurement
from peak to peak, to drive the piezo buzzer. The waveform is