41 results about "Hearing range" patented technology

The invention describes devices for performing thermodynamic work on a fluid, such as pumps, compressors and fans. The thermodynamic work may be used to provide a driving force for moving the fluid. Work performed on the fluid may be transmitted to other devices, such as a piston in a hydraulic actuation device. The devices may include one or more electroactive polymer transducers with an electroactive polymer that deflects in response to an application of an electric field. The electroactive polymer may be in contact with a fluid where the deflection of the electroactive polymer may be used to perform thermodynamic work on the fluid. The devices may be designed to efficiently operate at a plurality of operating conditions, such as operating conditions that produce an acoustic signal above or below the human hearing range. The devices may be used in thermal control systems, such as refrigeration system, cooling systems and heating systems.

A multi-channel digital hearing instrument is provided that includes a microphone, an analog-to-digital (A/D) converter, a sound processor, a digital-to-analog (D/A) converter and a speaker. The microphone receives an acoustical signal and generates an analog audio signal. The A/D converter converts the analog audio signal into a digital audio signal. The sound processor includes channel processing circuitry that filters the digital audio signal into a plurality of frequency band-limited audio signals and that provides an automatic gain control function that permits quieter sounds to be amplified at a higher gain than louder sounds and may be configured to the dynamic hearing range of a particular hearing instrument user. The D/A converter converts the output from the sound processor into an analog audio output signal. The speaker converts the analog audio output signal into an acoustical output signal that is directed into the ear canal of the hearing instrument user.

A participant in a three dimensional computer-generated virtual environment is able to control a dispersion pattern of his Avatar's voice such that the Avatar's voice may be directionally enhanced using simple controls. The audio dispersion envelope is designed to extend further in front of the Avatar and less to the sides and rear of the Avatar. The audio dispersion envelope may be static or controllable by the participant to enable the distance that the Avatar's voice travels within the virtual environment to be adjusted. This enables the Avatar to whisper or “shout” in the virtual environment such that other Avatars normally outside of hearing range of the Avatar may selectively receive audio generated by the user. Separate audio streams are mixed for each user from audio generated by users with Avatars within their Avatar's dispersion envelope. The volume of audio from a user in the mixed audio stream depends on the separation of the Avatars within the virtual environment.

An apparatus for creating an audio scene for an avatar in a virtual environment, the apparatus comprising: an audio processor operable to create a weighted audio stream that comprises audio from an object located in a portion of a hearing range of the avatar; and associating means operable to associate the weighted audio stream with a datum that represents a location of the portion of the hearing range in the virtual environment, wherein the weighted audio stream and the datum represent the audio scene.

A suppressor includes baffles with geometry and spacing minimizing sound level in the human hearing range, and overlapping tapers on consecutive elements replacing welds. The geometry includes conical baffles with approach angles between 153.7 and 163.7 degrees and at least one inch separation. The suppressor is assembled by compressing the elements between threaded end caps, thus expending the overlapping tapers against the interior of a suppressor tube to center and align the baffles. The suppressor may be attached to a rifle using a quick disconnect mount which includes an adapter fixed to the rifle barrel and having an “L” shaped slot with a first leg parallel to the barrel and a second leg turned greater than 90 degrees towards the front of the adapter. A post in the suppressor engaged the slot and a spring biases the suppressor forward and holds the post at the end of the turned leg.

The present invention employs sound generators, also known as acoustic transducers, which produce ultrasound or infrasound outside the normal human hearing range, placed in proximity to the vocal tract of the person whose speech is being detected, such as in front of the mouth. One or more microphones sensitive to these ultrasound or infrasound signals are also placed near the speaker's vocal tract, to pick up the return signals from the speaker, which are modified by passage through and around the vocal tract as the person speaks. This invention overcomes the limitations of detecting speech by the traditional method of capturing normal voice acoustic signals. The added information from the infrasound or ultrasound signals creates a unique acoustic signature for each action of the vocal tract during speech, which can be used to improve the reliability of computer speech recognition and the quality of transmitted voice.

A suppressor includes baffles with geometry and spacing minimizing sound level in the human hearing range, and overlapping tapers on consecutive elements replacing welds. The geometry includes conical baffles with approach angles between 153.7 and 163.7 degrees and at least one inch separation. The suppressor is assembled by compressing the elements between threaded end caps, thus expending the overlapping tappers against the interior of a suppressor tube to center and align the baffles. The suppressor may be attached to a rifle using a quick disconnect mount which includes an adapter fixed to the rifle barrel and having an “L” shaped slot with a first leg parallel to the barrel and a second leg turned greater than 90 degrees towards the front of the adapter. A post in the suppressor engaged the slot and a spring biases the suppressor forward and holds the post at the end of the turned leg.

The invention provides a hearing sieving and monitoring method, which comprises the following steps of: performing a plurality of audio tests on a testee in a graded mode to establish a hearing detection data list, wherein in each audio test, an audio is transmitted to the testee within a preset distance, the response of the testee to the audio is judged, and a specified value within the preset distance is progressively decreased and an audio which does not pass the test is transmitted to the testee if the audio does not pass the test; recording the distance of the response of the testee to the audio in the hearing detection data list; and checking and adjusting hearing-aid auxiliary equipment, such as hearing-aid volume or cochlear implant frequency according to the hearing detection data list, and generally acquiring the hearing range or the auditory distance of the testee or suggesting whether to receive detailed hearing examination, otological examination and the like. The hearing detection data list is repeatedly established for a long time, hearing conditions of the testee and the efficiency of a hearing aid can be continuously monitored, an alarm is provided, and the method is particularly suitable for hearing-impaired preschool children who have low language expression capacity.

Disclosed is an ultrasonic pest deterrent device adapted for use in greenhouses and gardens, comprising a printed circuit board, output signal transducer and a housing adapted to shroud the components of the assembly within its waterproof interior. The device comprises a ramp signal generator and voltage control oscillator adapted to sweep between a chosen set of switchable frequency pitch ranges and tones, a sweep stop for single tone testing, a confidence test button, a power switch and indicator light. The confident test button provides an audible tone within human hearing range to ensure the device is operational, while the power indicator light provides a visual means of verifying operation when the device is emitting signals in the ultrasonic range. A timing circuit disables or modulates the device from continuous operation, saving battery life and randomizing the output signal for increased pest annoyance and deterrence.

The invention discloses a self-adaptive hearing compensation method. The self-adaptive hearing compensation method comprises the following steps of firstly performing multi-channel decomposition for input signals by utilizing a gammatone filter group; then determining a compensation method based on a dynamic range of the signals in the channels and a hearing range of a hearing loss patient; if channel signals after being subjected to linear gain treatment are still within the hearing range of the patient, performing hearing compensation by using linear amplification so as to reduce distortion; otherwise, compensating by using dynamic range compression so as to add audibility. In addition, in order to reduce signal distortion caused by dynamic range compression and increase SNR (Signal to Noise Ratio) of an output signal in a noise environment, the self-adaptive compression method is adopted for hearing compensation so as to enable a compression ratio to be close to 1 to the greatest extent. Compared with existing hearing compensation methods, the self-adaptive hearing compensation method has higher intelligibility of compensated voice and obtains very strong practicability.

The object is to allow the adjustment of hearing aids without the use of sound-insulated acoustic booths. For this purpose provision is made for estimating a sound pressure level in front of the eardrum (5) from the sound pressure level in front of the hearing aid (2). Acoustic masking is determined from the estimated sound pressure level in front of the eardrum by means of a psycho-acoustic model. The actually measurable hearing range of the patient and therefore the optimum adjustment of the hearing aid can then in turn be determined from this.

The invention provides a broadcast television audio/video program odour exciting system which belongs to the technical field of televisions. The broadcast television audio/video program odour exciting system is characterized by comprising sound wave generating software, nonlinear editing software, a television program broadcasting service system, a television broadcasting server, a television transmission network, a television receiving terminal and a television display terminal, wherein the sound wave is out of the hearing range of human ears. The invention has the advantages of synchronously exciting the vision, hearing and smell organs of humans effectively and reasonably and ensuring that audiences have living feeling. The smell feeling is added on the basis of the traditional vision and hearing by a television technology so that the audiences have more living effect.

The invention provides a pole-and-tower bird dispeller. The bird dispeller comprises an inner cover and an outer cover, wherein the inner cover takes the shape of a cylinder with an open upper end; the outer cover takes the shape of a cylinder with an open lower end; the inner cover is positioned in the outer cover; the center lines of the inner cover and the outer cover are superposed; a power supply and an ultrasonic player are respectively mounted in the inner cover; a connecting board is mounted below the inner cover; a connecting frame is mounted on the connecting board; a bearing is mounted in the middle of the upper surface of the outer cover; a fixed shaft with the lower end fixed in the middle of the inner cover is mounted in the bearing; a first coating is arranged on the outer surface of the outer cover; and one ends of at least three connecting rods are uniformly mounted on the outer wall of the outer cover in the horizontal direction, and a vane is mounted at the other end of each connecting rod. The pole-and-tower bird dispeller has the benefits that wind drives the vanes to drive the coating on the outer surface of the outer cover to rotate through the connecting rods so as to play a bird dispelling role continually; and the ultrasonic player plays ultrasonic waves to stimulate the nervous systems of birds to lead the physiology of the birds to be disordered, without geographic restrictions, so that the birds flee; and as the ultrasonic frequency exceeds the hearing range of human ears, the influence on the human life from the ultrasonic waves can be reduced as much as possible.

The invention discloses a control system and method for reducing noise of an electromagnetic cooking utensil and the cooking utensil. The control system is arranged on the electromagnetic cooking utensil and comprises an electromagnetic heating control circuit and a controller, wherein the electromagnetic heating control circuit comprises a resonance circuit, a synchronization circuit and a comparison circuit; the synchronous circuit detects the operating frequency of the resonant circuit, and generates a synchronization signal; the comparison circuit transmits a comparison signal to the controller; and the controller judges whether the received operating frequency of the electromagnetic cooking utensil is within a set threshold value interval or not, adjusts the heating power, and furtheradjusts the operating frequency. According to the control system and method for reducing the noise of the electromagnetic cooking utensil and the cooking utensil, the controller detects the operatingfrequency of the resonant circuit in real time and judges whether the operating frequency is within the set threshold value interval or not, if the operating frequency is not within the set thresholdvalue interval, the controller adjusts the heating power of the electromagnetic cooking utensil and further adjusts the operating frequency, so that the operating frequency avoids the hearing range of human ears, and electromagnetic noise is reduced; and the reliability is high, the cost is low, user experience is better, and a cooking mood of a user is pleased.

The invention discloses a horn detector. The horn detector comprises an oscillating circuit, an amplifier and two probes, wherein the oscillating circuit is fixed in a shell of the detector; the oscillating circuit is used for generating an oscillation signal with a stable frequency, and the frequency of the oscillating signal is within the hearing range of a person; the amplifier is fixed in the shell of the detector, and is used for amplifying the oscillation signal to form an output signal; the two probes are arranged on the shell; the two probes are connected with the two input ends of a horn respectively. The horn detector is small in size, is supplied with power through a battery, and is convenient to hold and carry; the gain of the amplifier is adjustable, so that the output power of the detector is adjustable; the probes can be detached, so that the horn detector is easy and convenient to use.

The present invention relates to a device and a method for the stimulation of nerve and muscle cells according to the principle of magnetic stimulation, wherein the invention has a significantly reduced sound emission for the same stimulus intensity when compared to the prior art. The sound emission in the form of a click noise, which, in the magnetic stimulation, determines on the one hand an important safety risk and on the other hand causes an undesired, uncontrollable sensory-auditory brain stimulation is reduced in the present invention by increasing the frequency of a substantial portion of the spectrum of the pulse, preferably up to or beyond the human hearing range. The invention further relates to a quieter coil technology which reduces the conversion of electrical energy into mechanical-acoustic oscillations, prevents the transfer of said oscillations to the surface by resilient decoupling and instead converts the mechanical-acoustic energy via viscoelastic deformation of the material into heat.

The invention discloses a frequency hopping control circuit of an offline single-side voltage stability control system. The frequency hopping control circuit comprises an external feedback voltage-dividing circuit, a reference voltage circuit, a voltage comparator, a latch, a frequency hopping controller and a driving circuit, wherein the input end of the external feedback voltage-dividing circuitis connected to an external feedback voltage; the output end of the external feedback voltage-dividing circuit and the output end of the reference voltage circuit are connected to the input end of the voltage comparator; the output end of the voltage comparator is connected to the signal input end of the latch; the output end of the latch is connected to the enable end of the frequency hopping controller; the input end of the frequency hopping controller is connected to a delay signal; the output end of the frequency hopping controller is connected to the input end of the driving circuit; andthe driving circuit is configured to drive an external switching tube. The frequency hopping control circuit uses a partial linear frequency reduction and frequency hopping frequency conversion mode,has a working frequency skipping the hearing range of most human ears, minimizes noise pollution, raises the lowest frequency by an order of magnitude under the condition of ensuring a light load requirement, and basically eliminates the voltage output drop from the light load to full load.

The invention relates to the technical field of mini song requesting terminal equipment, in particular to a sound system of the mini song requesting terminal equipment. The mini song requesting terminal equipment and a mini music room, and the sound system is used in the mini music room. The mini music room comprises a movable bottom plate, a top plate matched with the movable bottom plate, and side plates which are installed between the movable bottom plate and the top plate and form a semi-closed space together with the movable bottom plate and the top plate. The sound system comprises at least one group of main sound amplifying boxes which are arranged on the rear side of the inner wall of the top plate so as to cover the sound production direction of the hearing range of a user, and a diffuser is arranged at the bottom of each main sound amplifying box and located above the inner wall of the rear side plate and used for decomposing reflected sound in the mini music room. According to the invention, howling in the mini music room can be avoided, and the influence of reflected sound on direct sound can be reduced by using the diffraction effect of the diffuser, so the sound field is more uniform.

The invention discloses a landform drawing device suitable for field environment camouflage measurement. The landform drawing device comprises a base, and lifting rods which are symmetrical in the front and back direction are arranged on the upper side of the base. A sound box is fixedly connected between the lifting rods; the sound box is provided with a sound production device. The sound production device comprises a sound production cavity located in the sound box. An opening and closing cavity with a rightward opening is formed in the right side of the sound production cavity. According tothe the sound wave reflection principle, sound waves exceeding the hearing range of human ears are emitted to conduct concealed surveying and mapping on the field environment, high-frequency sound waves are used for measuring and calculating the geomorphological characteristic distance, low-frequency sound waves are used for describing a geomorphological characteristic pattern, the part for receiving feedback sound waves can be folded and stored, the sound production structure can be adjusted in a lifting mode, carrying and camouflaging are convenient and the concealing capacity is improved.