Abstract: A member for producing an audible sound in a vehicle including a speaker area having an upper surface and a lower surface, the speaker area being located on the member. A piezo bimorph is attached to the speaker area, the piezo bimorph including a first piezoelectric element attached to the upper surface of the speaker area, and a second piezoelectric element attached to the lower surface of the speaker area. An amplifier in electrical communication with the piezo bimorph, the amplifier supplying an electrical field to the piezo bimorph, the piezo bimorph causing the speaker area and the member to vibrate, causing an audible sound.

Abstract: A method and a system for loudness calibration of a multichannel sound systems, wherein the test signal is psychoacoustically shaped. The psychoacoustically shaped test signal is preferably a pseudorandom test signal suitable for both automatic and subjective loudness calibration. Further, the psychoacoustically shaped test signal preferably has essentially constant specific loudness on the frequency range essential for aural perception.

Abstract: The feeder circuit to which the present invention pertains comprises means for regulating which serves to feed an electric current to a positive output terminal and a negative output terminal; means for feeding electric current which serves to feed an electric current to the means for regulating; means for regulator control which serves to control the electric current output from the means for regulating; a first resistance located between the negative terminal of the means for feeding electric current and the positive output terminal; and a second resistance located between the positive terminal of the means for feeding electric current and the negative output terminal.

Abstract: A built-in microphone device for use in an apparatus having a mechanism section generating internal noise inside a housing of the apparatus includes a main microphone for picking up an external sound; a noise reference microphone for picking up the internal noise; an adaptive filter member for generating a control audio signal based on an output signal from the noise reference microphone using a filter coefficient; a signal subtraction section for subtracting the control audio signal generated by the adaptive filter member from an output signal from the main microphone to generate a subtraction result; and a filter coefficient update control section for receiving an operation signal generated at the time of an operation of the mechanism section, and in response to the operation signal, updating the filter coefficient of the adaptive filter member based on the subtraction result generated by the signal subtraction section and an output signal from the noise reference microphone.

Abstract: Late audio buffer processing for intelligently muting audio output when audio buffers are not read fast enough from disk into digital signal processing (DSP) memory. Given a playback audio recorder, each channel of audio is associated with a forward and a reverse late threshold signals which are enabled when the processing of an audio buffer for that channel is delayed. When an audio buffer for that channel is delayed, the late threshold signal sets in motion the muting of that specific audio channel for a predetermined amount of time. If and when the system catches up, normal playback resumes. Otherwise, the channel stays muted.

Abstract: A semiconductor memory card for storing audio information with corresponding text information and type information, the type information indicating a type of the text information. The type is classified into at least (a), (b), and (c) in which the text information respectively includes a 1-byte character code sequence, a 2-byte character code sequence, and a 1-byte character code sequence and a 2-byte character code sequence.

Abstract: An method and a device for echo suppression in a handsfree apparatus, particularly for a telephone is disclosed. With the aid of a control unit, control signals are generated from the signal of the far-end subscriber, the output signal of the loudspeaker-room-microphone system and the output signal of an adaptive filter used as reference, the control signals having an amplitude and a time response dependent on the speech mode. Using the control signals, the amplifications VE, VS of controllable amplifiers disposed in the receiving and transmitting paths are adapted to the speech mode, thus reducing the residual echo. The stepless transition of the amplifications from a quiescent value to a value attenuated with the factor and having an exponential time characteristic in response to a change of speech mode, provides an impression of natural speech.

Abstract: A method and apparatus for automatically compensating a sound volume are disclosed. The method includes the steps of determining whether a channel conversion key and an audio input switching key are inputted, producing an energy of an audio signal when the channel conversion key is inputted, and comparing an energy value of the audio signal detected for a predetermined time period with an energy value obtained from a previous step thereof and compensating for as much volume as a difference obtained by the comparison. The method together with the apparatus considers a symmetrical characteristic of an audio signal, calculates a voice energy with regard to a half signal of the audio signal, converts the calculated signal to a simplified value, and automatically compensates for the volume accordingly, thereby removing redundant manual steps.

Abstract: The invention is a method of creating an enlarged listening sweet spot for multiloudspeaker audio reproduction. The method employs a plurality of audio drivers displaced generally in a horizontal dimension for a vertically oriented head of a listener, the drivers operating over a plurality of different passbands. Higher frequency drivers are located closer to one another and displaced more towards a center line of the listening space than lower frequency drivers, thereby causing a smaller change in acoustic ear signals for listeners seated away from the designed-for listening position, but without causing increased low frequency signal capacity requirements for phantom images generally outside the array. Specially adapted signal processing accounting for the layout of the various drivers and their associated crossover networks is employed to create desired audio images.

Abstract: A balance network directional coupler (BNDC) allows for effective coupling to sources of transmitted signals, communication lines, and devices that process received signals. The BNDC includes a transmission port, first and second amplifiers, a reception port, a communication line port, a transformer system, and a balance network. The second amplifier has a second gain of a polarity opposite the polarity of the polarity of the first gain. The transformer system has first and second windings each having first and second terminals, the first and second terminals of the first winding being electrically coupled to the communication line port, the first terminal of the second winding being electrically coupled to the reception port, and the second terminal of the second winding being electrically coupled to an output terminal of the second amplifier.

Abstract: The present invention relates to noise reduction technology for controlling exhaust noise in internal combustion engines such as an automobile engine and/or noise in a duct of an air delivery system such as air conditioning systems, and more particularly, to an apparatus and a method for controlling exhaust noise in an internal combustion engine or noise in a duct of an air delivery system using a conduit bypass pipe having variable or fixed lengths and dual mufflers.

Abstract: A method of processing left and right audio signals is disclosed which reproduces the illusion of a center channel while achieving a perception by the listener of a wider speaker separation. This method is partly obtained by altering the spectral response of the left and right speaker signals to obtain left and right sets of odd and even Fourier Transforms having certain characteristics. These processed signals are re-combined with the unaltered left and right signals to produce an expanded separation image that appears to extend beyond the physical location of the actual left and right loudspeakers, and to simultaneously centralize center channel signals to a point located between the loudspeakers.

Abstract: A network-based CODEC (coder-decoder) includes an echo canceler. This CODEC recognizes the presence of a data call by detecting predefined signaling portions of a modem handshaking process. For each detected data call, the CODEC uses a stored channel model for performing echo cancellation during the data call. The CODEC trains off-line during selected segments of the modem call and then stores the new channel model for use in a future data call.

Abstract: An electrostatic loudspeaker requires a high voltage DC bias power supply to bias the stators and diaphragms of electrostatic speakers. A self biased power supply eliminates the need for an external power supply by deriving a high voltage bias from the stator AC signal voltages which have been rectified and run from a high voltage tap and/or through a voltage multiplier which has a voltage limiting means.

Abstract: A method and system for providing suppression of near-end speech energy for tone signal detectors. In accordance with the invention a system or device is connected between the tip and ring on a subscriber loop, the subscriber loop being connected to office equipment and that subscriber's station set. The system also includes a receive interface that is connected to either a tone signal detector or a frequency shift keying modulator. The system achieves speech cancellation by forming a Wheatstone bridge with a mirror circuit possessing a scaled image of the loop and office equipment impedance. In one embodiment of the invention the Wheatstone bridge is formed using the combined impedance of the loop and office equipment as the impedance that is to be matched by a set of balanced networks included within the system.

Abstract: The present invention is a method and apparatus to control audio channels. Configuration registers configure usage of the audio channels. A plurality of channel logic circuits are coupled to the corresponding configuration registers to provide logic functions to the audio channels according to the configured usage.

Abstract: The method and the apparatus specify that the acoustic useful signal is generated from a electrical useful signal, that an electrical listening signal determined by the acoustic useful signal and by an acoustic noise signal at the listening location be recorded, and from this the useful signal component contained therein be extracted. Then the useful signal component contained in the listening signal is compared with the listening signal itself, and the electrical useful signal is adapted in dependence on this.

Abstract: A decorative flower with lighting and voice message is enclosed. The decorative flower includes a shaft having a tapering lower end, a middle section, and a top section having an enlarged inner space. A flower part having a number of artificial petals is encircled to the top section of the shaft to form a flower shape. A printed circuit board is mounted inside the middle section of the shaft. A microphone, a recording button and a playing button are arranged inside the middle section and electrically connected to the printed circuit board separately. A battery arranged inside the shaft for supplying power. A speaker is arranged in the enlarged inner space of the top section, and a light emitting element is mounted on the top end of the top section. Both of the speaker and the light emitting element are electrically connected to the printed circuit board. A ball pen refill is arranged inside the tapering lower end of the shaft, and the tip of the ball pen refill protrudes out of the shaft.

Abstract: The invention provides an acoustic cooling system with a noise reduction function of the type wherein a driving condition of a sound source used in the acoustic cooling system is controlled to compress coolant by a sound wave and a cooling object is cooled making use of an endothermic action of the coolant when the compressed coolant is expanded and which can reduce noise produced from the sound source effectively.

Abstract: A low voltage and low current compression circuit for connection between a telephone receiver and a telephone headset earphone, the circuit having an operational amplifier with variable gain, the gain being determined by the output signal level and by the presence or absence of transient signal spikes generated by the telephone receiver. The amplifier is connected to a voltage clipper circuit and a JFET feedback device, wherein the JFET operates as a variable resistance to control the signal feedback.