SDS-SERIES
INTRODUCTION
“Piezo Sound Technology, an endless
world of possibilities”
Sonitron Digital Square refers to a technology that is driving a piezo cup membrane mounted in
a cavity, with a square wave. The combination of drive frequency and the high quality response of
the cup membrane adjusted to the best acoustic function of the cavity in which the cup
membrane is mounted, offers an extremely high sound output.
The drive signal to the piezo is a square wave with a sufficient (Vpp) peak to peak voltage.
Square wave pulses contain very rich harmonic content of energy.
The tuned square wave signal with rich harmonics is driving the piezo cup membrane, the acoustic
function of the cavity combined with the piezo cup and the drive frequency is tuned until max.
sound output for several harmonic frequencies. The character and pitch of the sound output wave
can be adjusted to the desired acoustic signal.
Endless possibilities are revealed…
Prototype model
A combination of 2 cup acoustic cavities,
are used for making the car horn sound.
According to directive 70/388/ECC of the European
Commission, an audible warning device for motor
vehicles must produce a total SPL of min 105 dB(A)
and max 118 dB(A) at a distance of 2m.
The spectrum of the sound emitted by the device,
measured at a distance of 2m, must show a sound
pressure higher than that of any frequency
component above 3550Hz in the 1800 to 3550Hz
frequency band, and in no case less than 105 dB(A).
Cup A delivers the body of the sound. It is a mixed combination of low frequencies with a loud
sound pressure level, tuned on the human ear to warn for a situation with a non aggressive touch.
Cup B delivers the high sound component of min 105 dB(A) with a frequency between 1800Hz
and 3550Hz.
Basic terms: see "Considerations about sound" in addendum
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