CN85102564B

CN85102564B - A kind of electron horn with low noise

Info

Publication number: CN85102564B
Application number: CN85102564A
Authority: CN
Inventors: 宗有根
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1987-10-28
Also published as: CN85102564A

Abstract

A kind of low noise musical sound electronic horn is become by baseline tone generator, warble tone generator, trill modulation circuit, mu balanced circuit, emitter-follower output circuit and small-sized horn set of speakers.Have characteristics such as sound level is adjustable, tone color is soft, power consumption is low, directive property is good.Be applicable to that various forms of transport such as automobile, steamer are as the safety traffic loudspeaker of blowing a trumpet.

Description

A kind of electron horn with low noise

The invention belongs to safety traffic that transportation means the uses equipment of blowing a trumpet.

Before the present invention made, various forms of transport are the safety traffic of automobile, the steamer loudspeaker of blowing a trumpet for example, generally all adopt the Electromagnetically vibrating acoustical generator, it is a kind of mechanical spiral shell shape electromagnetic structure, by the alloy diaphragm, tungsten contact point and steel device soundboard are formed, external loudspeaker relay during use.This loudspeaker sound level is non-adjustable, the metal contact poor reliability, and the life-span is short, and power consumption is big, cisco unity malfunction when surpassing 65 ℃, pronunciation is dull, and the people is had excitement.

Electronic horn of the prior art, a kind of two homophonic horn trumpet is arranged, it is made up of (for example Belgian BE848315) counting circuit connection mono-electron oscillator, near present common medical truck alarming horn, it can only send a kind of alternately tone of rule of dullness, can not be do the safe driving use of blowing a trumpet, and employed Horn loudspeaker volume is bigger.

Electronic horn of the prior art, also have a kind of electronic alarm (for example U.S. US Pat.3810169) it by a basic announcement producer and modulating oscillation, the inverted phase type preamplifier, complementary power amplifier, microphone, Horn loudspeaker constitute, it can send the alarm song of fire extinguishing tanker, emergency vehicle and civilian defence, and the loudspeaker of can not blowing a trumpet as driving a vehicle use.

Also have a kind of electronic circuit (for example U.S. Usupat.4401975) of simulating the mechanical bell sound in the prior art, it is a kind of circuit arrangement of special use, and purpose is to use Eltec to send the bell sound of simulation, and the loudspeaker of can not blowing a trumpet as driving a vehicle use.

The main points of this electronic horn of the present invention are to have used principles such as frequency synthesis technique, electronic sound embellishment means and electron partial pressure on circuit, make the loudspeaker sound level adjustable, have the distinctive tremolo effect of electronic music, can obtain the synthetic effect of high bass by loudspeaker.

The present invention is by baseline tone generator, vibrato signal producer and trill modulation circuit, mu balanced circuit, emitter-follower output circuit, and small-sized horn speaker is formed.Its circuit working principle as shown in drawings.

Fig. 1 illustrates the baseline tone generator basiccircuit, forms audio frequency oscillator by PNP and NPN aerotron etc., and producing fundamental frequency is the square-wave signal of 500～530Hz.

Fig. 2 shows the basiccircuit of vibrato signal producer and modulator, and the frequency of vibrato signal producer is 8～10Hz, after emitter follower and filtering, becomes slick and sly sawtooth wave.Reference signal is carried out frequency modulation (FM), thus the blow a trumpet sound and the tremolo effect of electron gain musical sound.Signal waveform after the modulation as shown in Figure 3.

The power line voltage of the base bias voltage of baseline tone generator and vibrato signal producer all needs to supply with after voltage stabilizing, to guarantee the degree of stability of frequency.

Fig. 4 shows added emitter-follower output circuit between small-sized Horn loudspeaker and baseline tone generator, and its effect is to isolate both, thereby reduces the influence of load to reference frequency.

The volume of small-sized horn speaker is half of the Tianjin YHD5-1 of electroacoustic apparatus factory type loudspeaker, and horn is concentrated acoustic energy, improves phonation efficiency.The R12(that inserts resistance and be 3.3 Ω in small-sized horn speaker is with reference to Fig. 5), purpose makes sound level adjustable.The impedance of small-sized horn speaker is generally 2～3 Ω.

Electronic horn involved in the present invention compared with prior art, advantage such as it is adjustable to have sound level, and tone color is soft, power consumption is low, sounding directive property is good, be applicable to various forms of transport in city and suburb as the safety traffic use of blowing a trumpet.

The contriver once made an example, referring to accompanying drawing 5.

Claims

1, a kind of electronic horn that is applicable to that transportation means is blown a trumpet do safety traffic is characterized in that this electronic horn inserts resistance value in small-sized horn speaker be 3.3 resistance, makes sound level adjustable.The volume of small-sized horn speaker is about half of the Tianjin YHD5-1 of electroacoustic apparatus factory type loudspeaker.