Resonant mode loudspeakers

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Resonant mode loudspeakers

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Content:

• Bluetooth® Speaker with Resonant Sound Enhancement
• Does Room Correction Remove A Loudspeaker’s Sound Characteristics?
• Resonant room modes
• Turn It Up Past 11
• Driving Room Modes: Source Location
• CN103260121A - Resonant-mode ultra magnetostriction loudspeaker - Google Patents
• Effects of the Cone and Edge on the Acoustic Characteristics of a Cone Loudspeaker
• The acoustic phase resonances and surface waves supported by a compound rigid grating
• Room modes

WATCH RELATED VIDEO: How To Make A Resonant Speaker Out Of A Cymbal [EP-24]

Bluetooth® Speaker with Resonant Sound Enhancement

Application publication date : The invention relates to a resonant-mode ultra magnetostriction loudspeaker. The resonant-mode ultra magnetostriction loudspeaker comprises a resonance amplifying mechanism, an ultra magnetostriction driver, and a sound production loudspeaker box. The magnetostriction driver is arranged inside the resonance amplifying mechanism and the resonance amplifying mechanism is arranged on the sound production loudspeaker box.

The resonance amplifying mechanism comprises an L-shaped upper arm, a Z-shaped upper arm, and a side wall base which is connected with the upper arm and the lower arm, a threaded hole is formed in a side wall, a screw penetrates through the threaded hole to exert pre-compression to the resonance amplifying mechanism, the ultra magnetostriction driver is located between the upper arm and the lower arm, and a flexible hinge is adopted at the connecting position between the lower arm and the side wall.

A turning fork like product is used as an amplifying device for outputting the ultra magnetostriction driver, amplitude is directly amplified in a linear mode, sound intensity is improved, and power consumption is reduced. Furthermore, a frequency response curve of tuning fork resonance is used for revising the situation of unevenness of a frequency response of the ultra magnetostriction loudspeaker, and therefore the phenomenon of unbalance of all sound parts is lessened.

The resonant mode giant-magnetostrictive speaker Technical field. The present invention relates to a kind of New-type loudspeaker, especially a kind of resonant mode giant-magnetostrictive speaker. Giant magnetostrictive material is a kind of magnetostrictive material of realizing electricity-magnetic-mechanical energy conversion, this material is in certain alternating magnetic field, can stretch by spontaneous generation trace, be successfully applied to aspects such as sonar system, ultrasonic transducer, actuator, vibration insulating system and large torque low speed motor at present.

The conventional loudspeakers that giant-magnetostrictive speaker broken through in design adopts voice coil loudspeaker voice coil to drive and the mode of vibrating diaphragm sounding, thereby the arrangement that utilizes giant magnetostrictive material externally can change the material internal magnetic domain under the effect of excitation field makes the characteristic of length of material or stereomutation directly to drive the soundboard sounding. The pronunciation principle that present giant-magnetostrictive speaker generally adopts is: sound source signal is converted into alternating magnetic field by electromagnetic induction with AC signal after power amplification, be converted into mechanical oscillation signal by giant magnetostrictive material again, mechanical oscillation signal directly is carried in and makes its vibration sounding on the hard material.

Development to this giant magnetostrictive material loud speaker both at home and abroad all rests on the mode that single-point drives or adopts giant-magnetostrictive speaker and conventional loudspeakers to combine. Because super-magnetostrictive drive output amplitude displacement is limited, so comparing with conventional loudspeakers, giant-magnetostrictive speaker all has a certain distance on tonequality and loudness. The normal method of using is single increasing power amplifier multiple at present, but this can not improve tonequality and the increase driver output displacement of giant-magnetostrictive speaker, and exists power consumption big, and the cost height easily produces problems such as distortion.

The object of the present invention is to provide a kind of resonant mode giant-magnetostrictive speaker of introducing class tuning fork element.

Utilize the tuning resonance performance driving rigid planar vibration pronunciation of tuning fork, to improve tonequality. Utilize the class tuning fork to remove to revise the current magnetic telescopic driver frequency response curve that still has more defective for frequency response curve splendid in certain scope, adopt Multipoint Drive, make final frequency response curve more smooth the frequency response curve of tuning fork and the curve stack of former magnetic telescopic driver.

The technical scheme that technical solution problem of the present invention is taked is as follows:. The present invention includes resonance enlarger, super-magnetostrictive drive, sounding audio amplifier. Super-magnetostrictive drive is arranged in the resonance enlarger, and the resonance enlarger is arranged on the sounding audio amplifier; Described resonance enlarger comprises L type upper arm, the sidewall base of Z type underarm, connection upper arm and underarm, have screwed hole on the sidewall, screw passes this screwed hole super-magnetostrictive drive is applied precompression, and described super-magnetostrictive drive is between upper arm and the underarm; Flexible hinge is adopted in described underarm and sidewall junction.

Described super-magnetostrictive drive is made up of giant magnetostrictive rod, permanent magnet, coil rack, solenoid, the giant magnetostrictive rod that permanent magnet is housed in the coil rack and is clipped by two blocks of permanent magnets, coil rack is around with solenoid, and coil rack is contained in the sleeve.

The combined vibrator of described super-magnetostrictive drive and resonance enlarger has a plurality of. Compared with prior art, beneficial effect of the present invention:. The present invention adopts the resonance enlarger of class tuning fork as the amplifying device of super-magnetostrictive drive output, directly linearity has been amplified amplitude, promoted volume, reduced power consumption, utilize simultaneously tuning fork resonance the frequency response curve correction the uneven situation of giant-magnetostrictive speaker frequency response, alleviated the unbalanced phenomenon of each part.

The resonance mechanism that the present invention adopts can design its magnification ratio and frequency response curve within the specific limits arbitrarily. The present invention is simple in structure, and its sounding body can be hard materials such as sound plate or sound equipment, and its shape and thickness are unrestricted within the specific limits.

The present invention can adapt to soundboard and the audio amplifier of unlike material and size, as long as change the size of class tuning fork and the quantity of design and change tuning fork drive unit according to the deficiency of selected materials frequency response curve.

The present invention utilizes the pronunciation of multiple spot resonance excitation hard plate material, dull and stereotyped amplitude strengthens, volume strengthens, the tonequality of multiple spot correction loud speaker is better than the single-point type giant-magnetostrictive speaker, and the enhancing of power amplifier utilance has guaranteed the raising of volume especially, the performance of high tone quality.

Further specify the present invention below in conjunction with accompanying drawing. With reference to Fig. Super-magnetostrictive drive is arranged in the resonance enlarger, and the resonance enlarger is arranged on the sounding audio amplifier; Described resonance enlarger comprises L type upper arm , sidewall , the base of Z type underarm , connection upper arm and underarm, have screwed hole on the sidewall, screw passes this screwed hole super-magnetostrictive drive is applied precompression, and described super-magnetostrictive drive is between upper arm and the underarm; Flexible hinge is adopted in described underarm and sidewall junction.

The upper arm horizon bar is submissive arm, is similar to the yoke of traditional tuning fork. Magnetic telescopic driver generation audio frequency vibration amplifies its vibration by the submissive arm of resonance enlarger, and the vibration after will amplifying afterwards is passed to the generation audio amplifier, causes sounding audio amplifier sympathetic response sounding.

With reference to shown in Figure 4, super-magnetostrictive drive 2 is made up of permanent magnet 5, giant magnetostrictive rod 6, coil rack 7, solenoid 8. The giant magnetostrictive rod 6 that permanent magnet 5 is housed in the coil rack 7 and is clipped by two blocks of permanent magnets 5,5 pairs of giant magnetostrictive rods 6 of permanent magnet have applied bias magnetic field and have avoided giant magnetostrictive rod 6 to produce the frequency multiplication phenomenon under field drives, coil rack 7 is around with solenoid 8, coil rack 7 is contained in the sleeve 9, and the constant bias magnetic field superposition that the alternating magnetic field that solenoid 8 produces and permanent magnet 5 produce forms driving magnetic field.

With reference to shown in Figure 5, can select 5 to 7 resonance enlargers that the full frequency band signal frequency split is amplified, need special-purpose frequency divider that each signal is independently supplied with the resonant mode enlarger. At last by realizing harmonious sounding after the reasonable disposition of each resonance enlarger position.

With reference to shown in Figure 6, several resonance enlargers are structured the formation on the soundboard of distributed mode loudspeaker according to certain array approach, can make the vibration of each driver take place to superpose and resonate at soundboard, and the delay time of the input signal of each unit in the control array, can make sound wave can take place to superpose and do not interfere with each other in place or the direction of appointment, it is stereo that loud speaker is produced on a large scale, reaches expection space reverberation effect.

CNA en. KRB1 en. WOA1 en. USB2 en. KRA en. CNU en. TWA en. USA1 en.

Does Room Correction Remove A Loudspeaker’s Sound Characteristics?

Loudspeaker enclosure incorporating a leak to compensate for the effect of acoustic modes on loudspeaker frequency response. Field of the Invention. Background of the Invention. Summary of the Invention. Brief Description Of The Drawings. Figure 1 is a schematic diagram of a loudspeaker enclosure with a plurality of potential aperture locations, wherein one location A is in accordance with the present invention;. Figure 2 is a diagram illustrating acoustic mode behaviour in the closed cavity of the speaker enclosure of Figure 1;.

Resonant room modes

Resonant room modes affect the low frequency response of a sound system at the listening position. They are actually one of the biggest obstacles to high fidelity reproduction with modern equipment as they exist to varying degrees in all rooms and can only be reduced by the use of very big and bulky absorbent materials — like the foam wedges used in anechoic chamber s. Most rooms have several main resonant modes in the 20 Hz to Hz region, each related to a room dimension like length, breadth and height. Some relate to corner reflection, and are stimulated more if loudspeakers are placed in the corners. The effect on music reproduction is heard as 'muddy' bass, with some notes, especially on bass guitar standing out and persisting longer than they should and some notes 'disappearing' at antinodes. Most people are surprised when they first walk around a room while listening to low frequency test tones, the changes in level from almost nothing to loud often being quite startling. The mechanism of room modes Room modes sometimes called nodes are the result of standing waves which result from sound being reflected back off the walls of a room and interfering with the original traveling wave radiated by the source. At certain frequencies there will be some points in the room where the waveforms will add to produce an antinode or loud spot, and others where complete or partial cancellation occurs to produce a node.

Turn It Up Past 11

Correct mutual position of acoustic systems, enclosing constructions and listening zone can be an important tool to help reduce room resonance and achieve realistic sound stage. In order to correctly place acoustic systems in a rectangular symmetrical area, we recommend using acoustic calculators for each of the three typical cases:. Loudspeakers are placed along the short wall. Loudspeakers are placed along the long wall.

Driving Room Modes: Source Location

Velocity measurements. Signal attenuation. Control systems. Show All Keywords. Control of sound radiation from a plate into an acoustic

CN103260121A - Resonant-mode ultra magnetostriction loudspeaker - Google Patents

Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A transducer 14 for producing a force which excites an acoustic radiator, e.

Effects of the Cone and Edge on the Acoustic Characteristics of a Cone Loudspeaker

Room modes are the collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker. Most rooms have their fundamental resonances in the 20 Hz to Hz region, each frequency being related to one or more of the room's dimensions or a divisor thereof. These resonances affect the low-frequency low-mid-frequency response of a sound system in the room and are one of the biggest obstacles to accurate sound reproduction.

The acoustic phase resonances and surface waves supported by a compound rigid grating

Nearly all engineers are familiar with the concept of resonance and its many implications in system design. Electrical, mechanical, or mixed-mode resonance can be leveraged to provide design benefits or can be detrimental and negatively impact overall performance. This blog will provide a review of resonance-related issues including resonant frequency, factors affecting resonance in audio devices, how to use a frequency response curve, and challenges related to self-resonance in buzzers and speakers. Resonance occurs when a physical object or electronic circuit absorbs energy from an initial displacement or source, and then maintains the resultant mechanical or electrical vibrations without an additional force or energy acting on it. The frequency at which this vibration occurs is known as the resonant frequency, designated F0. Resonance is a physical phenomenon which appears in many forms and can occur anywhere in the frequency spectrum from low audio to GHz-level RF frequencies.

Room modes

The objective of this lab activity is to measure the impedance profile and the resonant frequency of a permanent magnet loudspeaker. The chief electrical characteristic of a dynamic loudspeaker is its electrical impedance as a function of frequency. It can be visualized by plotting it as a graph, called the impedance curve. The most common type of loudspeaker is an electromechanical transducer using a voice coil connected to a diaphragm or cone. The voice coil in moving coil loudspeakers is suspended in a magnetic field provided by a permanent magnet. Alternating current will move the cone back and forth.

Speaker, audio device thereof, and method of regulating frequency response. Patent number: Abstract: The invention provides a speaker, an audio device thereof, and a method of regulating frequency response. Type: Grant.