CN105763985A

CN105763985A - Plasma loudspeaker earphone

Info

Publication number: CN105763985A
Application number: CN201610129562.5A
Authority: CN
Inventors: 石鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-03-08
Filing date: 2016-03-08
Publication date: 2016-07-13

Abstract

The invention discloses a plasma loudspeaker earphone. The invention belongs to the electroacoustic field, and discloses a high-fidelity electroacoustic technology. The first characteristic is that the earphone combines the conventional technology of earphones and the technology of plasma loudspeakers; the closed structure of the earphone irons out the defects that the low frequency of the plasma loudspeaker is not sufficient and the sound generation efficiency is low; the plasma loudspeaker improves the transient performance of a conventional earphone and the amplitude-frequency characteristics. The second characteristic of the earphone is that the earphone improves the audio modulation mode of the plasma loudspeaker, linearly controls the current in a discharge arc through an audio transformer or an electronic tube, and achieves the lossless modulation of audio frequency.

Description

Plasma loudspeaker earphone

Technical field

Electronics and field of acoustics.

Background technology

Ventional loudspeakers is all adopt diaphragm oscillations to drive air sounding, although this structure phonation efficiency is significantly high, but the assembly quality owing to participating in vibration is far longer than air quality, and this just inevitably causes transient distortion and the problem of high frequency response deficiency；

Plasma loudspeaker technology abroad very early it has been proposed that, it has given up vibrating diaphragm by directly driving air sounding can solve the problem of dtmf distortion DTMF of ventional loudspeakers in theory, but owing to technological deficiency causes that current plasma loudspeaker yet suffers from problems with:

1. LF-response wretched insufficiency, below 1KHz is almost completely switched off, so plasma loudspeaker only limits the use of in voice unit at present；

2. the signal modulation system of conventional plasma speaker is " PWM pulsewidth modulation " or " high-frequency baseband amplitude modulation " these modulation systems not only circuit complexity but also is all damage modulation to destroy the fidelity of audio signal；

3. to go out very greatly acoustic efficiency low for conventional plasma speaker power consumption；

Harmful ozone can be produced when 4. working and discharge assembly is easily aging.

These problems constrain popularizing of plasma loudspeaker technology.

Summary of the invention

The present invention is a kind of earphone using plasma loudspeaker principle, (when people's ear drum membrane is enclosed in the same space with speaker, the change of internal acoustic pressure can cause the resonance of outside atmosphere pressure to utilize the high energy efficiency structure of earphone and low frequency to add powerful feature, this phenomenon is particularly evident in low-frequency range) solve above the problem 1. and 3. in " [0002] ", for the 2. described problem present invention, two kinds of solutions are proposed:

Scheme one:

With reference to accompanying drawing 1

Utilizing series voltage principle of stacking, audio signal be directly connected on DC high-voltage power supply after transformer boost, this way can improve the fidelity of signal in theory to greatest extent.Utilizing the avalanche effect of electric current in electric arc, the step-up ratio of booster transformer just need not can produce sufficiently strong acoustic pressure very greatly.This design not only circuit structure is simple and compatible with traditional audio output circuit (load capacity is sufficiently strong).

Scheme two:

With reference to accompanying drawing 2

Utilize the avalanche effect of electric arc, control pipe (transistor or electron tube) of connecting in the electrion loop of plasma loudspeaker controls arc current, owing to plasma loudspeaker is a kind of Class A speaker, it is driven both to need AC compounent also to want DC component, utilizing this characteristic electric arc is " biasing resistor " and " load " of anode, anode is equivalent to direct band load and eliminates " output transformator " or " output capacitance ", and the benefit so brought is apparent: reduces distorted signals, obtain better LF-response, reduce system bulk etc..

For 4. described problem, it is considered herein that in the acceptable scope of tonequality it is contemplated that whole arc discharge device is encapsulated in an airtight space, and it is full of helium (filling the way existing precedent abroad of helium) wherein, the film that a kind of special material is made is used in the position of voice output, this film is thin and light makes sound readily penetrate through thus reducing the infringement to tonequality, in addition to also need to increase an air-pressure balancing device with extraneous atmospheric pressure balance.

Accompanying drawing illustrates:

1. accompanying drawing 1 is transformator audio modulating circuit schematic diagram；

2. accompanying drawing 2 is electron tube or transistor audio modulating circuit schematic diagram.

Claims

1. the present invention relates to a kind of high-fidelity headphone technology, use the plasma loudspeaker technology not having vibrating diaphragm as earphone pronunciation unit, relatively conventional have film earphone can effectively reduce transient distortion, strengthen high frequency response ability, the problem that earphone characteristic just compensate for the LF-response deficiency of isoionic speaker simultaneously.

2. the plasma phonation unit used in the present invention adopts the voice modulation technology voltage superposition modulation of original creation, and this technology has the advantages that circuit structure is simple, signal fidelity is high, can be directly compatible with conventional audio output circuit.