88results about How to "Improve low frequency response" patented technology

A system for and method of enhancing the low frequency response of a loudspeaker for relatively low input level audio signals and protect the loudspeaker for relatively high input level audio signals is disclosed. The system comprises: a crossover network configured so separate an audio input signal into at least two frequency bands including a low frequency band; and a signal compressor responsive to the energy level of the low frequency portion of an input audio signal in the low frequency band and configured to provide amplification gain on the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively low so as to enhance the low frequency response of the loudspeaker, and attenuation of the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively high so as to protect the loudspeaker from being overdriven. The system is configurable so that it can be used to enhance the loudspeakers of audio and video play devices such as televisions and computers.

A loudspeaker system has an extended bass or low frequency response. The loudspeaker system integrates a passive radiator with a transducer. The loudspeaker system also mechanically isolates the passive radiator and the transducer. A support mechanism mechanically grounds vibrations or other forces from the transducer and passive radiator that may interfere or affect the operation of the loudspeaker.

An improved electrodynamic acoustic transducer eliminates or reduces the need for flexible or elastic materials to suspend an internal magnetic element by using both static and dynamic signal-dependent magnetic fields to control its movement. In one implementation, the transducer has a magnet that moves within a surrounding tube. This tube in turn supports one or more electromagnetic coils that generate a dynamic signal-dependent magnetic field that causes the internal magnetic element to vibrate. The surrounding tube also supports one or more magnets whose location on the tube is fixed and whose magnetic fields provide appropriate restoring forces acting on the internal magnetic element. These fixed magnets may be replaced or supplemented by ferromagnetic materials. This transducer may provide sound and infrasonic vibration by coupling the internal magnetic element to other radiating elements or by being placed in close proximity to or in actual contact with the pinna or meatus of the human ear when used in headphones or earphones, for example, and it also may provide sound through the direct vibration of the air in contact with the surface of the internal magnetic element. When direct atmospheric coupling is not required, the transducer may be assembled in a sealed enclosure.

Systems and methods for enhancing the low frequency response of a loudspeaker for relatively low input level audio signals and protect the loudspeaker for relatively high input level audio signals make use of a crossover network configured so separate an audio input signal into at least two frequency bands including a low frequency band; and a signal compressor responsive to the energy level of the low frequency portion of an input audio signal in the low frequency band and configured to provide amplification gain on the low frequency portion of the input signal when the energy level of the low frequency portion of the input signal is relatively low. One or more peak limiters may be positioned before the summer(s), in the circuit, but after the low band compressor. The EQ unit(s) may be positioned before all processing to the L and R inputs.

The invention relates to insert earphones and anti-radiation insert earphones, which comprise an earphone head and a sleeve (1), a tone cavity (2), a sound wave transmission channel (3), a micro loudspeaker shell (4), a micro loudspeaker (5), a microphone (6), a microphone shell (7), a conducting wire (8) and a plug (9), wherein the channel is arranged between the tone cavity and the micro loudspeaker, the channel is made of insulating materials, the micro loudspeaker is separated from or integrated with the microphone and comprises the micro loudspeaker shell, wherein the micro loudspeaker is located on one end of the micro loudspeaker shell, the earphone head and the sleeve are located on the other end of the shell, the middle part is the sound wave transmission channel, the micro loudspeaker, the microphone, the conducting wire and the plug are connected in turn, the conducting wire uses a shielding shielded wire, which is characterized in that the length of the channel is 155-600mm, the volume of the tone cavity is 600-3000mm3, a small hole is arranged on an outlet of the tone cavity, which enables the tone cavity to form a small sound box with the diameter of 1.5-4mm, and the insert earphones are suitable for using on communication equipment with strong radial line such as mobile phones.

A low frequency exponential/hyperbolic hybrid folded horn enclosure intended for use in proximity with at least one planar surface, such as a floor, ceiling, or wall, with access to the horn throat from the top of the enclosure. The horn is bifurcated at the throat and folds horizontally around a central trapezoid-shaped vertical back chamber which is reflex ported for enhanced low frequency response below the frequency cutoff of the horn. The back chamber outer sides define part of the horn channel, resulting in a relatively simple structure with a small footprint and no void internal space. The throat exponential expansion cross-sectional area is consistently maintained while the proportions of the throat channels are elongated to the height of the enclosure,

An antenna for passing a cable to a second antenna includes shorts positioned along a circumferential perimeter of the antenna, first and second bicone sections of oppositely directed conductive cone sections energized at respective apices and opening along an antenna axis, first and second dipole sections, where the first dipole section is joined together with and extending from the first conical section to the circumferential perimeter of the antenna, and where the second dipole section is joined together with and extending from the second conical section to the circumferential perimeter of the antenna.

A piezoelectric contact-type microphone structure is provided. With this structure, the piezoelectric element directly touches the speaker's skin without the intervening sponge or spring to fully pick up the skin vibration and to avoid high-frequency attenuation. The structure also provides an ample room for the piezoelectric element to undergo full structural change. The structure avoids the low-frequency distortion resulted from a resonance structure formed by the piezoelectric element, the sponge or spring, and the casing of the microphone. A microphone using this structure has a flat frequency response and a superior performance both for high- and low-frequency voice signals.

The invention provides a current sensor easy to install and with a magneto-electric composite material. The current sensor comprises a magnet ring formed by assembling magnetic cores, and a sensitivecomponent composed of a magnetostrictive material layer and piezoelectric ceramic material layers arranged in the two sides of the magnetostrictive material layer respectively; an electrode in the endportions of the piezoelectric ceramic material layers is connected with the signal processing circuit via a lead; the signal processing circuit processes a voltage signal output by the piezoelectricceramic material layers and then sends the processed signal to external equipment for display, the bottom of the sensor is provided with a bearer which includes an elastic thin metal sheet which is bent to an arc shape; installation portions in the two ends of the bearer are provided with installation holes respectively; and the when the bearer bears a pressure, the arc-shaped thin metal sheet isdeformed, and thus, distance between the two installation holes is adjusted. The current sensor is high in stability and resolution, simple in operation and wide in suitable range.

The invention provides a handheld current sensor with a magneto-electric composite material. The senor comprises a magnet ring, a sensitive component, permanent magnets and a signal processing signal;the magnet ring is formed by assembling magnetic cores; the sensitive component is composed of a magnetostrictive material layer and piezoelectric ceramic material layers arranged in the two sides of the magnetostrictive material layer respectively; the end portions of certain two adjacent magnetic cores are provided with grooves in which the sensitive component is placed, and the permanent magnets are arranged in the two sides of the sensitive component respectively; an electrode in the end portions of the piezoelectric ceramic material layers is connected with the signal processing circuitvia a lead; and the signal processing circuit processes a voltage signal output by the piezoelectric ceramic material layers and then sends the processed signal to external equipment for display. Thehandheld current sensor is high in stability and resolution, simple in operation and wide in suitable range.

The embodiment of the invention discloses a radio-frequency measurement device with a variable attenuator, wherein the measurement device includes an automatic level control circuit with the variable attenuator. Output signals of the automatic level control circuit control the variable attenuator to perform attenuation. The variable attenuator includes a diode group and a low-frequency matching section. The diode group includes at least two diodes which are serially connected in the same direction. A positive-direction end of the diode group is connected with an output end of the variable attenuator and a negative-direction end of the diode group is connected with an input end of the variable attenuator. One end of the low-frequency matching section is arranged between the two diodes and other end is grounded. The low-frequency matching section is an RLC circuit which includes a resistor, an inductor and a capacitor, which are serially connected. The radio-frequency measurement device with the variable attenuator realizes broadband continuous attenuation so that attenuation amount is increased significantly and the device has a characteristic that the control circuit is significantly simple.

The invention discloses a method for receiving and processing seismic signals, which comprises the following steps: setting a plurality of detectors with different frequency characteristics at a same seismic surveying point, and simultaneously receiving seismic signals by using the detectors so as to obtain a plurality of seismic recording signals with different frequency characteristics; eliminating the time difference and phase difference between the seismic signals so as to obtain synchronous seismic recording signals; and after respectively carrying out frequency-domain weighting processing on the synchronous seismic signals, carrying out superposed synthesis processing on the synchronous seismic signals so as to obtain seismic recording signals with ideal low frequency response, intermediate frequency response and high frequency response. In the invention, through simultaneously receiving the seismic signals of a same surveying point by using the detectors with different frequency characteristics, then sequentially carrying out frequency-domain weighting and superposition on the received seismic signals, the obtained synthetic seismic signal is large in dynamic range, wide infrequency band and high in sensitivity, and has ideal low frequency response, intermediate frequency response and high frequency response, and the capacity of the signal for identifying underground thin layers can be improved.

The invention discloses a method for enhancing frequency response of a miniature loudspeaker module group, and the miniature loudspeaker module group and an electronic device. The method is used for enhancing the frequency response of the miniature loudspeaker module group. The method for enhancing the frequency response of the miniature loudspeaker module group comprises that: an inverter tube is additionally arranged in a rear cavity of the miniature loudspeaker module group so that a second sound source is formed in the inverter tube when an active sound source works, wherein the second sound source and the active sound source radiate jointly; and according to amplitude characteristics of a vibrating diaphragm of the active sound source of the miniature loudspeaker module group with the additionally arranged inverter tube, matching enhancement processing is performed on an input signal of the active sound source. According to the technical scheme, the frequency response of the whole miniature loudspeaker module group is enhanced at a low frequency band below F0 due to the additionally arranged inverter tube, and the matching signal enhancement processing is further performed according to the amplitude characteristics of the active sound source so that the frequency response of the whole frequency band of the miniature loudspeaker module group is greatly enhanced.

A speaker module (200) having a speaker unit (210) and a speaker box (220) is provided. The speaker module is mounted in a casing (22) of a hand-held electronic device (20). The speaker box (220) has a wall defining an aperture (222a) receiving the speaker unit therein. The speaker box has a neck section (224) formed by narrowing a peripheral wall of the speaker box. The neck section connects front and rear speaker chambers (222, 226) each of which has a cross-sectional dimension larger than that of the neck section. The speaker module is mounted on a printed circuit board (24) by fitting the neck section in a hole (24a) of the printed circuit board. The speaker unit is mounted in a front wall of the front chamber (222). An antenna module (26) is mounted in the casing behind the speaker module.

The invention relates to an electroacoustic transducer. The electroacoustic transducer comprises a moving coil type transduction module and a flat plate type transduction module, The moving coil typetransduction module comprises a magnet, a voice coil and a vibration element, wherein the voice coil is arranged between magnetic poles of the magnet and is connected with the vibration element. The flat plate type transduction module comprises a frame, a vibrating diaphragm and a flat plate magnet array. The periphery of the vibrating diaphragm is fixed on the frame and is provided with a coil, and a flat magnet array is arranged on one side or two sides of the vibrating diaphragm corresponding to the coil. The low-frequency response effect of the flat plate type loudspeaker can be improved,and the depth distance of the sound field of the loudspeaker is increased, so that the sound field of the loudspeaker is effectively improved, and the spatial layering sense is improved.

The invention discloses an offshore broadband air gun seismic source based on virtual and real depth combination. The source comprises a main seismic source and N-stage auxiliary seismic sources, wherein a first wave of the first-stage auxiliary seismic source in the N-stage auxiliary seismic sources and a ghost wave of the main seismic source are completely counteracted at the far-field end, a first wave of the next-stage auxiliary seismic source and a ghost wave of the previous-stage auxiliary seismic source are completely counteracted at the far-field end, the auxiliary seismic sources areequivalent to air gun seismic sources set at a specific virtual depth, meanwhile, the main seismic source and the N-stage auxiliary seismic sources are designed to be air gun arrays with real depth combination, and first waves of air guns at different depths in the main seismic source are subjected to same-phase superposition by adopting a time-delay excited mode. According to the method, the low-frequency response is effectively improved, meanwhile, the frequency domain notch introduced by the virtual and real depth ghost waves is compensated, so that the design purpose of a broadband seismicsource wavelet is achieved.

The invention discloses a headset with the function of the loudspeaker box, at least comprising two earmuffs, a lead, an audio-frequency power amplifier, a shift switch and transmission lines. Each of the two earmuffs is internally provided with a loudspeaker; the lead is provided with a plug and is electrically connected with the two loudspeakers; the audio-frequency power amplifier is arranged on the lead and is electrically connected between the plug of the lead and the two loudspeakers; the shift switch is used for shifting different audio-frequency output power signals to the two loudspeakers so as to shift the function of headset or the function of the loudspeaker box; the inner cavity of each of the two earmuffs is provided with one transmission line for generating the helmholtz resonance; and the outlet holes of the transmission lines are arranged on the shells of the two earmuffs so as to effectively strength the low-frequency response of the loudspeaker box and the headset. Adopting the structure, the headset with the function of the loudspeaker box has simple structural design and light weight and is easy to operate and convenient to carry. The function of the headset and the function of the loudspeaker box can be shifted immediately, thus the cost spent in buying the loudspeaker box by the consumer is saved. The low-frequency response of the headset with the function of the loudspeaker box can be effectively strengthened.

The invention provides a diaphragm, an MEMS microphone chip and a manufacturing method thereof, at least two uniformly distributed air escape valves are arranged on a diaphragm body, and each air escape valve comprises a movable part and a hole; the holes are provided with step-shaped sections, and the number of steps of the step-shaped sections is one or more. According to the technical scheme disclosed by the invention, the air escape valve with the stepped pore section is arranged, so that the air escape valve can be opened to play a role in quickly releasing pressure when being violently impacted, and the damping of pores to air can be increased when the air escape valve is not opened, so that the low-frequency response of the MEMS microphone chip is improved; in addition, due to the adoption of the step-shaped structure, the sensitivity of low-frequency response to pore size deviation is reduced, so that the process precision requirement can be reduced, and the yield and the consistency of products are improved.