Abstract: In one embodiment, an electronic device includes an audio connector port comprising a ground terminal and one or more audio output terminals, a first audio amplifier coupled to one of the audio output terminals, and a multiplexer having an output terminal coupled to the input terminal of the first audio amplifier. Sense circuits inside the electronic device may be alternately coupled through the multiplexer and first audio amplifier so that, in a first mode of operation, the multiplexer couples the audio signal to the first audio output terminal, and in a second mode of operation, the multiplexer couples an analog voltage corresponding to an internally sensed value to the first audio output terminal. Use of the audio connector and audio circuitry to access internal electrical parameters may facilitate testing and analysis of internal systems.

Abstract: A micro speaker having a capacitive sensor to sense a motion of a speaker diaphragm, is disclosed. More particularly, embodiments of the micro speaker include a conductive surface of a diaphragm facing conductive surfaces of several capacitive plate sections across a gap. The diaphragm may be configured to emit sound forward away from a magnet of the micro speaker, and the capacitive plate sections may be supported on the magnet behind the diaphragm. In an embodiment, the gap provides an available travel for the diaphragm, which may be only a few millimeters. A sensing circuit may sense capacitances of the conductive surfaces to limit displacement of the diaphragm to within the available travel.

Abstract: A sound transducer includes a substrate with a cavity with extending from a first surface of the substrate, a body at least partially covering the cavity and being connected to the substrate by at least one resilient hinge, a first set of comb fingers mounted to the substrate, and a second set of comb fingers mounted to the body. The first set of comb fingers and the second set of comb fingers are interdigitated and configured to create an electrostatic force driving the body in a direction perpendicular to the first surface of the substrate. The body and the at least one resilient hinge are configured for a resonant or a near-resonant excitation by the electrostatic force.

Abstract: A microphone having an embedded haptic device, along with an associated program product and methodology for controlling the haptic device. A microphone is disclosed that includes: a haptic device embedded therein capable of outputting a haptic response; and a haptic control system having an input system for receiving an external input associated with a use of the microphone, an analysis engine for analyzing the external input, and a haptic response controller for triggering the haptic response.

Abstract: An earplug connector for simultaneously providing an audio signal from a vehicle or an extra-vehicular source to a pilot while providing power to a noise reduction device while operating the vehicle. The earplug connector has a multi-pin connector for receiving audio signal and power from a pilot interface assembly connected to the vehicle. A ground, power, and audio signal connector transfers power to a noise reduction device worn by a pilot. An audio output continuously transfers audio signals from the multi-pin connector to earplugs and a multi-pin signal separator is in electrical and audio communication between the multi-pin connector and the ground, power, and audio signal connector. The audio output receives audio signals from the multi-pin connector and selectively passes the audio signals to the earplugs while transferring power to a noise reduction device while accepting a plurality of pin configurations.

Abstract: A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.

Abstract: One example discloses an acoustic pairing device, comprising: an acoustic processor configured to receive a first acoustic signal and a second acoustic signal; a signal comparison module configured to identify a propagation delay or amplitude difference between the first and second acoustic signals; and a pairing module configured to output a pairing signal if the propagation delay or amplitude difference is between a first value and a second value. Another example discloses a method for acoustic pairing between a first device and a second device, executed by a computer programmed with non-transient executable instructions, comprising: receiving a propagation delay or amplitude difference between a first acoustic signal and a second acoustic signal; pairing the first and second devices if the propagation delay or amplitude difference is between a first value and a second value.

Abstract: A direct digital drive audio system and method system and method are presented. The direct digital drive system and method utilizes a digital signal to directly drive the speakers. In one exemplary implementation, an audio system includes a sample register, an convergence adjustment component, an accumulated error register, a digital driver and a speaker. The sample register is coupled to the convergence adjustment component which is coupled to the accumulated error register and the digital driver which in turn is coupled to the speaker. The sample register holds an audio sample. The convergence adjustment component calculates the error for each sample. The accumulated error register stores an accumulated error. The digital driver determines whether to drive on a positive digital value, drive on a negative digital value or not drive. The speaker creates audio sounds based upon a signal from the digital driver.

Abstract: A sound collection method and an electronic device are disclosed. The method is applicable to an electronic device that includes an image acquisition unit and an audio collection unit. The method includes determining a focus object when the image acquisition unit is acquiring images; obtaining a position relationship information between the focus object and the image acquisition unit based on the focus object; obtaining a first direction information based on the position relationship information; and controlling the audio collection unit to collect the sound from a sound source corresponding to the first direction based on the first direction information.

Abstract: Methods and apparatus for determining phase shift information between the first and second microphone signals for a sound signal, and determining an angle of incidence of the sound in relation to the first and second positions of the first and second microphones from the phase shift information of a band-limited test signal received by the first and second microphones for a frequency range of interest.

Abstract: A method for operating a hearing device including an ambient microphone, a signal processing unit, a receiver and an ear canal microphone. The method includes steps of filtering the audio signal processed by the signal processing unit with a filter having a transfer function including a transfer function from an output of the receiver to an input of the ear canal microphone when the hearing device is turned on and being worn in an ear canal of the user, computing a difference between the audio signal picked up by the ear canal microphone and the filtered signal, and detecting a presence of own-voice of the user based on the difference. Furthermore, a hearing device including an own-voice detection unit is provided, which is adapted to perform the proposed method.

Abstract: A method and apparatus for providing an opportunistic crowd based service platform is disclosed. A mobile sensor device is identified based on a current location and/or other qualities, such as intrinsic properties, previous sensor data, or demographic data of an associated user of the mobile sensor device. Data is collected from the mobile sensor device. The data collected from the mobile sensor device is aggregated with data collected from other sensor devices, and content generated based on the aggregated data is delivered to a user device.

Abstract: A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.

Abstract: Microphone stages in a microphone array may be coupled together in a daisy chain. Each stage may include a microphone, an analog to digital converter, a decimation unit, a receiver, an adder, and a transmitter. The converter may convert analog audio microphone signals into digital codes that may be decimated. The adder may add decimated digital codes in each stage to a cumulative sum of decimated digital codes from prior stages. This new sum may be transmitted to the next microphone stage, where the adder may add the decimated digital codes from that stage to the cumulative sum. A serial interface may be used to connect the transmitters and receivers of each of the stages. The serial interface may be used to transmit the cumulative sum of decimated digital codes between the stages. The serial interface may also be used to transmit configuration data between the stages.

Abstract: Systems, methods, and apparatus to filter audio are disclosed. An example method includes determining that an orientation of a playback device is one of (a) a first orientation and (b) a second orientation, the playback device including a first speaker and a second speaker and configuring the first speaker and the second speaker. In the example, configuring the first and second speakers includes, when the determined orientation is the first orientation, configuring a first audio filter to be applied to a first audio signal for the first speaker and configuring a second audio filter to be applied to a second audio signal for the second speaker. However, when the determined orientation is the second orientation, configuring the first and second speakers includes configuring a third audio filter to be applied to the first audio signal and the second audio signal.

Abstract: Methods, systems, and apparatus for selectively communicating data and audio over a limited-size audio plug. A host device determines whether an audio accessory or a data communicating accessory is plugged therein via a signal, or lack thereof, communicated to the host device via the audio plug of the accessory. The host device then either communicates audio or data over the audio plug contacts that are typically used only for audio communication based on whether its connected to an audio accessory or data communicating accessory. An audio plug may also include a split-ring contact where multiple, independent contacts are formed in place of a single tip, ring, or sleeve contact. The split-ring contact may be used for communicating audio and/or data.

Abstract: Apparatus for generating a target physical effect, at least one attribute of which corresponds to at least one characteristic of a digital input signal sampled periodically, the apparatus comprising a multiplicity of electrostatic actuator elements, each comprising a moving element moving between first and second electrodes, the multiplicity of electrostatic actuator elements including Nr first subsets (R-subsets) of actuator elements and Nc second subsets (C-subsets) of actuator elements, wherein a first partitioning of the multiplicity of actuator elements yields the Nr first subsets (R-subsets) and a second partitioning of the multiplicity of actuator elements yields the Nc second subsets (C-subsets); a first plurality of Nr electrical connections (R-wires) interconnecting the moving elements of actuator elements in each R-subset, such that the moving element of any actuator element in each individual R-subset is electrically connected to the moving elements of all other actuator elements in the individual

Abstract: The present invention relates to a microphone arrangement (M) which has a charge pump (LP), which produces a DC voltage, a transducer (WA), which converts acoustic signals into electrical signals and which is connected to the charge pump (LP), and a control unit (VCLFS), which controls the charge pump (LP) and which adjusts the DC voltage produced by the charge pump (LP).

Abstract: Provided is a condenser microphone having a plurality of condenser microphone units connected in series to improve output sensitivity, and simplify a circuit configuration of the condenser microphone. The condenser microphone units are directly connected to each other in series. An audio signal obtained from one condenser microphone unit, excepting a last series-connected condenser microphone unit, is transmitted to an adjacent succeeding condenser microphone unit, and first and second impedance converters each using an active element are connected to first and last series-connected condenser microphone unit. The audio signals obtained from the condenser microphone units are added and output with balance from output terminals of the first and second impedance converters.

Abstract: The invention provides a microphone amplifier circuit which enhances the SNR (signal noise ratio) and expands the dynamic range by reducing the noise level. A microphone amplifier circuit includes a preamplifier which amplifies an audio signal from a capacitor microphone, a level detection circuit which outputs a level detection signal when the level of the audio signal is in the vicinity of the noise level of the microphone amplifier circuit, and an attenuator which attenuates the level of the audio signal outputted from the preamplifier in response to the level detection signal. The preamplifier includes an operational amplifier, a feedback capacitor and a feedback resistor.

Abstract: A circuit embodied in a mobile device is disclosed. The circuit includes a headphone audio driver, a loudspeaker audio driver and a switch coupled to outputs of the headphone audio driver and the loudspeaker audio driver. The switch is configured to connect the output of the loudspeaker audio driver to an external speaker when an external speaker is connected to the mobile device. The external speaker may be detected using methods such as automatic accessory detection or impedance measurement or a user configuration or a use action. The circuit may also include an impedance detector to drive the switch based on an impedance measurement. A user interface is provided to enable a user of the mobile device to driver the switch based on user preferences.

Abstract: A method for automatically switching to a channel for transmission on a portable radio is provided. In operation, a first microphone is assigned to respond to communications received on a primary channel and a second microphone is assigned to respond to communications received on a non-primary channel. The portable radio receives independent audio communications simultaneously on the primary channel and the non-primary channel when operating in a multi-watch mode. The portable radio determines a signal gain corresponding to a voice command received at the first and second microphones. When the signal gain for the first microphone is larger than the signal gain for the second microphone, the portable radio switches to a first talk-back channel to respond to communications received on the primary channel. Otherwise, the portable radio switches to a second talk-back channel to respond to communications received on the at least one non-primary channel.

Abstract: Methods and systems specifically designed to reduce loudspeaker distortion by reducing voice coil excursion are provided. An input audio signal is processed based on a specific linear model of a loudspeaker, and a dynamic filter is generated and applied to this audio signal. The filter changes the relative phases of the spectral components of the input signal to reduce estimated excursion peaks. The quality of the audio signal is not diminished in comparison to traditional filter approaches. The processing of the input signal may involve determining a main frequency which may be used to determine the fundamental frequency. Multiples of the fundamental frequencies provide harmonic frequencies. The phases of all the harmonic frequencies, including the fundamental, may be measured and compared to a target vector of phases. The difference between the measured phases and the target phases may then be used to calculate the poles and zeros and corresponding filter coefficients.

Abstract: A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: The disclosed apparatus, systems, and methods provide a calibration technique for calibrating a set of microphones. The disclosed calibration technique is configured to calibrate the microphones with respect to a reference microphone and can be used in actual operation rather than a testing environment. The disclosed calibration technique can estimate both the magnitude calibration factor for compensating magnitude sensitivity variations and the relative phase error for compensating phase delay variations. In addition, the disclosed calibration technique can be used even when multiple acoustic sources are present. The disclosed technique is particularly well suited to calibrating a set of microphones that are omnidirectional and sufficiently close to one another.

Abstract: A microphone includes two backplates. A membrane is located between the two backplates. A voltage source applies a first bias voltage to the membrane and the first backplate and applies a second bias voltage to the membrane and the second backplate. A control unit adjusts the first and the second bias voltage. A method to center the membrane in a final electro-mechanic equilibrium position between the two backplates in a microphone is also disclosed.

Abstract: Uplink transmission device and method for an audio signal via an audio interface are provided. In the device, a first pin of the audio interface is connected to a signal output terminal of an uplink audio signal generating device via a first circuit, and a second pin of the audio interface is connected to the signal output terminal of the uplink audio signal generating device via a second circuit. The first pin of the audio interface is one of a microphone pin and a ground pin, and the second pin of the audio interface is the other one of the microphone pin and the ground pin. The first circuit and the second circuit are attenuation circuits for each other.

Abstract: A radio reception device for vehicle 100 (200) includes a variable phase shifter 22, an amplitude regulator 23, and an adder 24, and has an arrangement in which a signal of an RF, IF, or baseband stage of a radio receiver mixed with a noise is added to a phase-inverted component of the noise to remove only the noise. Therefore, sound distortion due to loss of sound information does not occur so that a quality sound can be provided.

Abstract: An apparatus and method are provided for detecting radio accessories within a communication system formed of a radio, a primary accessory and a secondary accessory. The secondary accessory comprises a resistor network which switchably couples parallel resistors in response to a bias input generated from either a microphone bias voltage or speaker bias voltage of the primary accessory. Various parallel combinations of the resistors indicate the secondary accessory type. Control logic in the primary accessory determines the type of secondary accessory by comparing digital signals representative of the current sourced through the resistor network (175) to predetermined values stored in look-up table. The utilization of the microphone bias and/or speaker bias of the primary accessory advantageously negates the need for any additional pins or complex circuitry at the primary accessory.

Abstract: In some embodiments, a method for processing output of at least one microphone of a device (e.g., a headset) to identify at least one touch gesture exerted by a user on the device, including by distinguishing the gesture from input to the microphone other than a touch gesture intended by the user, and by distinguishing between a tap exerted by the user on the device and at least one dynamic gesture exerted by the user on the device, where the output of the at least one microphone is also indicative of ambient sound (e.g., voice utterences). Other embodiments are systems for detecting ambient sound (e.g., voice utterences) and touch gestures, each including a device including at least one microphone and a processor coupled and configured to process output of each microphone to identify at least one touch gesture exerted by a user on the device.

Abstract: A device comprising measurement (7) and reference (3) interferometers is disclosed. Each interferometer is configured to receive light from the same light source (1) and to emit light to respective detectors (6) and has a respective operating point. The measurement interferometer (7) is configured to respond to variations in a physical parameter by varying the intensity of light emitted, whereas the reference interferometer (3) is configured to be unresponsive to variations in the physical parameter. The device further comprises a signal processor for generating a differential output signal depending on respective output signals generated by the detectors (6).

Abstract: A programmable acoustic sensor is disclosed. The programmable acoustic sensor includes a MEMS transducer and a programmable circuitry coupled to the MEMS transducer. The programmable circuitry includes a power pin and a ground pin. The programmable acoustic sensor also includes a communication channel enabling data exchange between the programmable circuitry and a host system. One of the power pin and the ground pin can be utilized for data exchange.

Abstract: An embodiment as described herein includes a microelectromechanical system (MEMS) with a first MEMS transducer element, a second MEMS transducer element, and a semiconductor substrate. The first and second MEMS transducer elements are disposed at a top surface of the semiconductor substrate and the semiconductor substrate includes a shared cavity acoustically coupled to the first and second MEMS transducer elements.

Abstract: An integrated circuit device includes a circuit board (1200?), the circuit board including a first diaphragm (714-1) that forms a first microphone, a second diaphragm (714-2) that forms a second microphone, and a differential signal generation circuit (720) that receives a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone, and generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal.

Abstract: Herein described is an electro-pneumatic sound alarm, to be fitted on a two or four wheeled vehicle, constituted by an electro-compressor (2), having the function of drawing atmospheric air, compressing it and conveying it to an acoustic group (3). Such sound alarm (1) is characterized in that the electro-compressor (2) and the acoustic group (3) are mutually held by means of removable fit-coupling; furthermore, the coupling elements are rigid and integral with the aforementioned two components (FIG. 1).

Abstract: An acoustic apparatus including circuitry to correct for acoustic cross-coupling of acoustic drivers mounted in a common acoustic enclosure. A plurality of acoustic drivers are mounted in the acoustic enclosure so that motion of each of the acoustic drivers causes motion in each of the other acoustic drivers. A canceller cancels the motion of each of the acoustic drivers caused by motion of each of the other acoustic drivers. A cancellation adjuster cancels the motion of each of the acoustic drivers that may result from the operation of the canceller.

Abstract: A charging circuit includes a charge pump circuit, an integrating circuit, and a clock signal output circuit. The charge pump circuit generates a boosted voltage by boosting an input voltage at a rate in synchronization with an input clock signal. The integrating circuit is configured to integrate the boosted voltage to apply the integrated boosted voltage to a boost capacitor. The clock signal output circuit is configured to output a second clock signal that is higher in frequency than a first clock signal to the charge pump circuit as the clock signal for a predetermined period of time upon start up, and thereafter output the first clock signal to the charge pump circuit as the clock signal.

Abstract: This document discusses, among other things, systems and methods to at least partially compensate for temperature sensitivity in a digital microphone system including, for example, a temperature sensitive membrane, such as an electrets condenser microphone (ECM).

Abstract: A processing chip for a digital microphone and related input circuit and a digital microphone are described herein. In one aspect, the input circuit for a processing chip of a digital microphone includes: a PMOS transistor, a resistor, a current source, and a low-pass filter. The described processing chip possesses high anti high-frequency interference capabilities and the described input circuit possesses high high-frequency power supply rejection ratio.

Abstract: An impedance matched resonant circuit uses inductors coupling an audio source and a speaker array in order to reduce feedback reflection induced by an audio signal traveling from the audio source to the array of speakers. An RC circuit could also be coupled to the positive and negative terminals of the speaker array to reduce the slope differential of the audio signal at certain frequencies. The circuit can be packaged together in a single module with switches to activate and deactivate portions of the circuit to alter the effectiveness of the circuit depending upon need.

Abstract: Electronic devices and accessories such as headsets for electronic devices are provided. A microphone may be included in an accessory to capture sound for an associated electronic device. Buttons and other user interfaces may be included in the accessories. An accessory may have an audio plug that connects to a mating audio jack in an electronic device, thereby establishing a wired communications link between the accessory and the electronic device. The electronic device may include power supply circuitry for applying bias voltages to the accessory. The bias voltages may bias a microphone and may adjust settings in the accessory such as settings related to operating modes. User input information may be conveyed between the accessory and the electronic device using ultrasonic tone transmission. The electronic device may also gather input from the accessory using a voltage detector coupled to lines in the communications path.

Abstract: A microphone and a method for calibrating a microphone are disclosed. In one embodiment the method for calibrating a microphone comprises operating a MEMS device based on a first AC bias voltage, measuring a pull-in voltage, calculating a second AC bias voltage or a DC bias voltage, and operating the MEMS device based the second AC bias voltage or the DC bias voltage.

Abstract: An adjustable microphone. The microphone includes a MEMS microphone, a charge pump, a preamplifier, a first analog-to-digital converter, a root mean square (RMS) power detector, and a logic circuit. The MEMS microphone is configured to provide a signal indicative of sound detected by the MEMS microphone. The charge pump provides a bias voltage to the MEMS microphone. The preamplifier receives the signal from the MEMS microphone, and outputs an amplified signal indicative of sound detected by the MEMS microphone. The first analog-to-digital converter receives the amplified signal and converts the amplified signal to a digital signal. The root mean square power detector is configured to detect a power level of the amplified signal and output an indication of the power of the amplified signal. The logic circuit receives the RMS power detector output and a control input, and adjusts the operation of the microphone based on the control input.

Abstract: Reflection cancelling boundary microphones are described in which a microphone capsule is mounted within the pressure zone of a vibrating surface and the microphone is tuned in such a way as to cancel pressure waves reflected by the surface while admitting pressure waves generated by the vibration of the surface. One embodiment of the invention includes a microphone capsule configured to be mounted within the pressure zone of a vibrating surface. In addition, the microphone is tuned to cancel pressure waves reflected by the surface while admitting pressure waves generated by the vibration of the surface.

Abstract: Electronic devices and accessories such as headsets for electronic devices are provided. A microphone may be included in an accessory to capture sound for an associated electronic device. Buttons and other user interfaces may be included in the accessories. An accessory may have an audio plug that connects to a mating audio jack in an electronic device, thereby establishing a wired communications link between the accessory and the electronic device. The electronic device may include power supply circuitry for applying bias voltages to the accessory. The bias voltages may bias a microphone and may adjust settings in the accessory such as settings related to operating modes. User input information may be conveyed between the accessory and the electronic device using ultrasonic tone transmission. The electronic device may also gather input from the accessory using a voltage detector coupled to lines in the communications path.

Abstract: An MEMS microphone is provided which includes a reference voltage/current generator configured to generate a DC reference voltage and a reference current; a first noise filter configured to remove a noise of the DC reference voltage; a voltage booster configured to generate a sensor bias voltage using the DC reference voltage the noise of which is removed; a microphone sensor configured to receive the sensor bias voltage and to generate an output value based on a variation in a sound pressure; a bias circuit configured to receive the reference current to generate a bias voltage; and a signal amplification unit configured to receive the bias voltage and the output value of the microphone sensor to amplify the output value. The first noise filter comprises an impedance circuit; a capacitor circuit connected to a output node of the impedance circuit; and a switch connected to both ends of the impedance circuit.

Abstract: Amplifier arrangements for read-out of MEMS capacitive transducers, such as low-noise amplifiers. An amplifier circuit has first and second MOS transistors, with the gate of the first transistor driven by the input signal, and the gate of the second transistor driven by a reference. The sources of the first and second transistors are connected via an impedance. Modulation circuitry is arranged to monitor a signal with a value that varies with the input signal and to modulate the back-bias voltage between the bulk and source terminals of the first and second transistors with the applied modulation being equal for each transistor and based on said monitored signal. The back-bias of the first transistor can be increase to extend the input range of the transistor in situations where the input signal may otherwise result in signal clipping, while avoiding noise and power issues for other input signal levels.

Abstract: A microphone includes a polar piece contacting with a first magnetic pole of a first permanent magnet, a yoke body annularly arranged around the polar piece through a magnetic gap G with a predetermined width, a magnetic circuit unit including a tail yoke connected to the yoke body and contacting with a second magnetic pole of the first permanent magnet, and a diaphragm unit provided with a voice coil arranged to vibrate in the magnetic gap. The second magnetic pole of the first permanent magnet contacts with one side of the tail yoke, a first magnetic pole of the second permanent magnet is disposed to contact with other side of the tail yoke, a magnetic path is produced between the second magnetic pole of the second permanent magnet and the yoke body, and the first permanent magnet and the second permanent magnet are polarized in the same sense.

Abstract: An external clock signal having a first frequency is received. A division ratio is automatically determined based at least in part upon a second frequency of an internal clock. The second frequency is greater than the first frequency. A decimation factor is automatically determined based at least in part upon the first frequency of the external clock signal, the second frequency of the internal clock signal, and a predetermined desired sampling frequency. The division ratio is applied to the internal clock signal to reduce the first frequency to a reduced third frequency. The decimation factor is applied to the reduced third frequency to provide the predetermined desired sampling frequency. Data is clocked to a buffer using the predetermined desired sampling frequency.

Abstract: A method for driving a condenser microphone is provided. The condenser microphone comprises a membrane and an electrode constituting a capacity. A polarization voltage is applied between the membrane and the electrode. According to the method, an electrical signal generated by the condenser microphone based on a received acoustic signal causing a deflection of the membrane) is detected, and the polarization voltage is varied in response to the detected electrical signal.