CN2398793Y

CN2398793Y - Ultrasonic loudspeaker

Info

Publication number: CN2398793Y
Application number: CN 99238343
Authority: CN
Inventors: 李秀元
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-19
Filing date: 1999-08-19
Publication date: 2000-09-27
Anticipated expiration: 2009-08-19

Abstract

The utility model relates to an ultrasonic loudspeaker, which comprises an ultrasonic oscillation circuit, a sound source, a modulation circuit, a power amplification circuit, and an ultrasonic transducer, wherein, constant-amplitude ultrasonic waves generated by the ultrasonic oscillation circuit are conveyed to the modulation circuit; the constant-amplitude ultrasonic waves are modulated into amplitude-modulation ultrasonic waves by sound signals which come from the sound source; after the amplitude-modulation ultrasonic waves are amplified by the power amplification circuit, the ultrasonic transducer is pushed for sending out the amplitude-modulation ultrasonic waves. The utility model uses the ultrasonic waves to generate bass, and has the advantages of small size, low cost, and simple structure.

Description

The ultrasonic wave loudspeaker arrangement

The utility model relates to a kind of device that utilizes ultrasonic wave to produce audio frequency, particularly bass.

The audio frequency of household electrical appliance is generally produced by loud speaker at present, the high frequency of 1KHz to 20KHz utilizes the direct sounding of loud speaker fairly simple, but the low frequency that 250Hz is following, have only with the audio amplifier that the heavy caliber loud speaker is housed and to produce, 97 Beijing electronics reported for the 37th phase once introduced to utilize two groups of ultrasonic waves to produce the method for basses, this method is diverse with the method for raising one's voice to its utmost with audio amplifier, not only volume is little for it, and bass response, can be low to moderate infrasound, but this mode must be emitted simultaneously and could be realized by two groups of different ultrasonic waves, and these two bursts of frequency of ultrasonic can't differ too big, can cause circuit too complicated during practical application, baroque problem.

The purpose of this utility model is that the sound-producing device that a kind of volume is little, cost is low, simple in structure will be provided.

The purpose of this utility model is achieved in that the ultrasonic wave loudspeaker arrangement, comprises source of sound, supersonic oscillations circuit, modulation circuit, power amplification circuit and ultrasonic transducer.Supersonic oscillations circuit, modulation circuit, power amplification circuit and ultrasonic transducer connect in turn, and source of sound and modulation circuit connect.Deliver to modulating part by amplitude ultrasound level signals such as supersonic oscillations circuit generations, audio signal from source of sound is modulated into constant amplitude ultrasound level signal the amplitude modulation ultrasonic wave that changes with the audio level height by modulating part, through power amplification circuit it is amplified to power demand promotion ultrasonic transducer again and sends the amplitude modulation ultrasonic wave, this amplitude modulation ultrasonic wave that changes with audio frequency is exactly the sound that can be heard by the people, the utility model is because only need one group of ultrasonic wave, so structure is simple especially, cost is also a kind of low than preceding, and volume is significantly smaller than audio speaker.

The utility model content is described in detail in detail with reference to the accompanying drawings.

Fig. 1 is the utility model structural representation.

Fig. 2 is one of the utility model circuit working schematic diagram.

Fig. 3 is two of the utility model circuit working schematic diagram.

With reference to Fig. 1, the utility model comprises source of sound 3, supersonic oscillations circuit 1, modulation circuit 2, power amplification circuit 4 and ultrasonic transducer 5, described supersonic oscillations circuit 1, modulation circuit 2, power amplification circuit 4 and ultrasonic transducer 5 connect in turn, and source of sound and modulation circuit 2 connect.

With reference to Fig. 2, by time-base circuit IC ₁(NE555), R ₁, C ₁The stable multi-oscillation circuit of the duty ratio about 50% of three element compositions, the ultrasonic signal level of the about 100KHz of generation, this signal is through C ₂Be coupled to the base stage of triode V, when the source of sound input is arranged, because the effect of TTF2～2, cause the collector current of V to change along with source of sound level height, after transistor base electric current and collector current interaction, the moving contact output signal level of W is exactly the amplitude modulation ultrasonic signal level with the sound power source change, by the ultrasonic signal level after the amplitude modulation through C ₃Deliver to power amplification circuit, IC ₂(LM389), C ₃, C ₄, C ₅, C ₆The power amplification circuit of forming after the signal level of the circuit of automodulation in the future is amplified to power demand, sends ultrasonic wave by ultrasonic transducer, regulates the power output that W can change power amplification circuit.

With reference to Fig. 3, IC ₁(LM567), W, C ₁Constitute the signal level that high-frequency oscillating circuits produces about 100KHz, through R ₁, C ₃Lotus root is bonded to power amplification circuit, when the sound source signal level acts on the base stage of triode V, its collector current will be along with variation, because collector electrode, the emission electrode of V also are connected in the input of power amplification circuit, so when the collector current of triode changes with source of sound, also can cause the high-frequency signal level changes in amplitude that is input to power amplification circuit, by IC ₂(TKA2009), C ₃, C ₄, C ₅, C ₆, R ₄, R ₅, R ₆The power amplification circuit of forming will promote ultrasonic transducer and sends ultrasonic wave after will amplifying from front end positive amplitude modulation high-frequency signal level.

Claims

1, a kind of ultrasonic wave loudspeaker arrangement, comprise source of sound, supersonic oscillations circuit, modulation circuit, power amplification circuit and ultrasonic transducer, it is characterized in that described supersonic oscillations circuit, modulation circuit, power amplification circuit and ultrasonic transducer connect in turn, source of sound and modulation circuit connect.

2, device as claimed in claim 1 is characterized in that described supersonic oscillations circuit is by IC ₁, resistance R ₁And capacitor C ₁Form; Modulation circuit is by R ₂, R ₃, potentiometer W, capacitor C ₂Form with triode V; Power amplification circuit is by IC ₂, capacitor C ₃, C ₄, C ₅And C ₆Form, the output of oscillating circuit is through C ₂Link to each other with triode V base stage, the source of sound output links to each other with triode V collector electrode, the output signal of modulation circuit through power amplification circuit after C ₆Send to ultrasonic transducer.

3, device as claimed in claim 1 is characterized in that described oscillating circuit is by IC ₁, potentiometer W and capacitor C ₁Form, modulation circuit is by resistance R ₁, R ₂, capacitor C ₂Form with triode V, power amplification circuit is by IC ₂, resistance R ₃, capacitor C ₃, C ₄, C ₅, C ₆, R ₄, R ₅, R ₆Form, the output signal of oscillating circuit is through R ₁Link to each other with the V base stage to power amplification circuit source of sound output, the collector electrode of V, emission electrode also are connected in the power amplification circuit input.