56results about How to "Flat Frequency Response" patented technology

A thin film bulk acoustic wave (BAW) resonator structure and filter which can be fabricated by inexpensive manufacturing techniques and in smaller size than conventional such products are to be provided. The BAW resonator structure and filter have a substrate, a first BAW resonator placed over the substrate, an acoustic reflection layer placed over the first BAW resonator and a second BAW resonator placed over the acoustic reflection layer, and the acoustic reflection layer is electroconductive. Herein, the acoustic reflection layer constitutes a first electrode, and this first electrode electrically connects and acoustically separates the first BAW resonator and the second BAW resonator.

The present invention relates to a suspension member for a diaphragm and to an electro-acoustic transducer applying such suspension member. The suspension member comprises an inner portion being adapted to be attached to a piston, an outer portion being adapted to be coupled to a substantially stationary portion of an associated electro-acoustic transducer, and a flexible member connecting the inner and outer portions. The flexible member comprises at least one electrically conducting element adapted to transport electrical signals across the suspension member.

A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

A test probe tip constructed substantially from resistive material. The resistive material is made of resistive conducting material substantially enclosed in and dispersed throughout encapsulating material. The test probe tip has a probing end for probing electronic circuitry and a connection end for interfacing with a probing head. The resistive conducting material forms at least one path through the encapsulating material from the probing end to the connection end. The resistive conducting material may be a plurality of longitudinally-extending resistive/conductive members or a plurality of particulate resistive/conductive members.

A method of converting an audio signal into vibratory modulation of a fluid includes converting a series of pulses representative of the audio signal into a plurality of signals having an intermediate peak-to-peak voltage; summing said signals having said intermediate voltage to provide a driver signal having a high peak-to-peak voltage; supplying said driver signal to an electrostatic fluid accelerator; and generating a corona discharge inducing said vibratory modulation of said fluid.

The invention relates an electrostatic speaker system comprising—a high voltage switching power amplifier,—an extraction filter having an input coupled to an output of the high voltage switching amplifier, and—an electrostatic speaker element having a capacitive load and an input coupled to an output of the extraction filter. The combination of the extraction filter and capacitive load form a filter circuitry having at least a first filter stage and a second filter stage. The first filter stage comprising a RLC circuit having a resonant frequency ωO and a quality factor Q>½ and wherein the second filter stage being a low pass filter comprises at least one electrical element for damping a signal component at the resonant frequency of the RLC circuit at the output of the extraction filter.

In a stalk-type field probe, each of three resistive dipoles is formed with a resistive feedline on a common circuit board. Each circuit board comprises an elongated feedline section that extends through a cylindrical stalk, and a cross-arm that is disposed at a 54.7° angle relative to the elongation of the feedline section. The feedline sections are arranged to form an equilateral triangular prism, and the cross arms are arranged so that the dipole on each cross-arm is perpendicular to an imaginary plane to which the lines along which the elements of both of the other dipoles extend are parallel.

An apparatus and method allow receivers to quickly acquire a pseudorandom noise signal. A receiver advantageously detects frequency shifts using a compact parallel process hardware implementation of a Discrete Fourier Transform (DFT). The simultaneous detection of multiple frequencies allows the receiver to search the frequency range of the transmitted signal in larger increments of frequency, thereby increasing the speed of acquisition. One receiver does not use coherent integration before computation of the transform and advantageously maintains a flat frequency response. The flat frequency response of the DFT circuit enables searching of multiple frequency offsets without CPU intensive processing to compensate for frequency response variations. A receiver can include a Doppler correction circuit, which permits correlation data with frequency shift in the code to be non-coherently integrated among relatively fewer addresses or tap positions in memory.

The invention discloses a method for compensating the amplitude of an emission signal of a broadband sonar system. The method comprises the following steps that a sonar emission system emits an ideal chirp signal x0[n], and an ideal sonar reception system is used to collect a distorted chirp signal y[n] in a soundproofing water pool; an error function e[n] is constructed, an estimated value, which satisfies the condition of min{E[e2[n]]}, of a transfer function of a broadband matching network and an energy transducer is searched, and a transfer function w[n] of an amplitude compensator is obtained; the amplitude compensator adjusts the amplitude of the ideal chirp signal; the power of the adjusted chirp signal is amplified; the power-amplified chirp signal is output to the energy transducer via the broadband matching network; the energy transducer converts an electrical signal into an acoustic signal and radiates the acoustic signal to water; and the ideal sonar reception system is used to collect the acoustic signal emitted by the energy transducer in the soundproofing water pool. The method can be used to reduce amplitude distortion of the emission signal, and has the advantage of high precision.

The invention discloses a pickup method based on a microphone array, a pickup device and a storage medium. The pickup method based on a microphone array comprises the following steps that A, determining the microphone array, providing the microphone array with a plurality of microphone channels, wherein each microphone channel comprises at least one microphone unit; B, establishing an error probability model as follows: representing an actual steering vector; C, constructing an optimal problem of a differential beam design algorithm based on the error probability model; D, solving an optimal solution of the optimal problem to obtain weight vectors of a plurality of microphone channels of the microphone array; and E, adjusting the voice signal collected by the microphone array according to the weight vector, and outputting the optimized voice signal. The pickup method provided by the invention has good anti-interference performance, especially has good directivity at a low-frequency position, and is low in distortion degree.

The invention discloses a distortionless sound playback system for counter electromotive force signals. The distortionless sound playback system is characterized by comprising a counter electromotive force signal loudspeaker and a counter electromotive force signal amplifier, wherein when the loudspeaker body is distorted, and the motion speed of a paper disk is deviated from a desired value under the pressure of air in a sound box or the influence of sound reflection, resonance, standing waves and harmonic factors, a sound coil in the counter electromotive force signal loudspeaker, which is connected with the paper disk, can instantly detect the generated deviation and feed back the deviation to the counter electromotive force signal amplifier; and the counter electromotive force signal amplifier instantly makes a response to rectify the deviation until the deviation completely disappears. The distortionless sound playback system is rational in design; the loudspeaker is changed into a standard four-end network provided with an input and an output; and moreover, an output signal can really reflect an electric signal of the motion of the loudspeaker, so that a power amplifier and the loudspeaker belong to a real electronic network system. The frequency response is wide and flat, and the sound is not subjected to distortion and phase shift; the counter electromotive force signal loudspeaker can replace all treble, alto and bass loudspeakers in the sound box; and therefore, the step of adjusting the troublesome frequency divider is omitted, and the manufacturing cost of the sound box is greatly reduced.