The electronic circuit having an input stage for pre-amplifying an electrical input signal of the electronic circuit provided by a transducer. The electronic circuit has an output stage for providing a microphone output signal by processing an output signal of the input stage. The electronic circuit has an adjustable output load arranged and configured for setting a current draw of the output stage. Additionally, the electronic circuit has a measurement circuit configured to capture the output signal of the input stage and an automatic control circuit configured to adjust the adjustable output load dependent on the captured output signal of the input stage.

A sound signal processing apparatus includes: first amplifier which amplifies a sound signal, depending on an input level of the sound signal; and second amplifier which amplifies with a gain the sound signal amplified by first amplifier. Second amplifier automatically decreases the gain when a level of the sound signal is greater than an upper limit threshold, and second amplifier automatically increases the gain when the level of the sound signal is lower than the upper limit threshold and when the gain is lower than a predetermined value. When second amplifier increases the gain, second amplifier changes the gain at a first speed when a user has performed an operation to decrease the input level, and second amplifier changes the gain at a second speed lower than the first speed when the user has not performed the operation to decrease the input level.

A noise detector, a method of detecting noise and an analysis/alert engine. In one embodiment, the noise detector includes: (1) a vibration sensor configured to derive a raw signal from noise proximate the noise detector and (2) a noise score generator, coupled to the vibration sensor, and having a processor configured to generate a noise score based on electrical properties of the raw signal and an ambient sound level that uniquely corresponds to a location of the noise detector, the noise score being insufficient to reproduce a content of the raw signal.

A headset includes a microphone that detects an acoustic signal, and converts the acoustic signal into a microphone signal, an audio processor that receives the microphone signal, and a twisted pair conductor element coupling the microphone and the audio processor. The twisted pair conductor element self-cancels a radio frequency (RF) field to prevent the RF field from entering the microphone.

Systems, methods, and devices for implementing an audio assisted dynamic barcode system. A gate validation system may include a barcode reader, a speaker, and a processor configured to perform operations including receiving, using the barcode reader, a first barcode from a portable electronic device indicating a request for passage through a gate. The operations may also include outputting, using the speaker, an audio signal having a predetermined feature. The operations may further include receiving, using the barcode reader, a second barcode from the portable electronic device indicating a detected feature of the audio signal. The operations may further include determining that the detected feature matches the predetermined feature and, in response to determining that the detected feature matches the predetermined feature, facilitating passage of a holder of the portable electronic device through the gate.

This application relates to methods and apparatus for digital microphones. Disclosed is a digital microphone apparatus (300) for outputting a digital output signal (DATA) at a sample rate defined by a received clock signal (CLK). The apparatus includes a band splitter (302) configured to receive a microphone signal (S.sub.MD) indicative of an output of a microphone transducer and split said microphone signal into first signal path (S.sub.P1) for frequencies in a first band and a second signal path (S.sub.P2) for frequencies in a second band, the frequencies of the second band being higher than the frequencies in the first band. A modulation block (304) is configured to operate on the second signal path to down-convert signals in the second signal path from the second frequency band to a lower frequency band.

The various implementations described herein include methods, devices, and systems for calibrating LED(s). In one aspect, an electronic device includes: (1) a plurality of light emitting diodes (LEDs); (2) one or more processors; and (3) memory storing a plurality of color correction matrices, each color correction matrix of the plurality of color correction matrices: (a) corresponding to an LED of the plurality of LEDs, (b) generated based on a desired color value for the corresponding LED, and (c) scaled to prevent overrange of color values for the corresponding LED; and the memory includes instructions for operating the plurality of LEDs in accordance with the stored plurality of color correction matrices.

A digital microphone with a dynamic gain scaling system is provided. An ASIC coupled the microphone to the scaling system. An input buffer, a preamplifier, a pair of switching element, a bias source, and a capacitor coupled to the pair of switching element is integrated into the ASIC. In one embodiment, the scaling system is integrated into the ASIC. In another embodiment, the scaling system is a second ASIC and is coupled to the ASIC. The scaling system includes a ADC, a PDM, and a delta-sigma based BR filter and is configured to dynamically adjust various parameters of the ADC, preamplifier, and the bias source.

A method for processing an input sound signal of singing voice, to obtain a sound signal with an impression different from the input sound signal, includes: selecting a genre from among a plurality of tune genres in accordance with a selection operation by a user, setting, to a first unit, a set of first parameters corresponding to the selected genre, displaying a first impression identifier corresponding to the selected genre for a first control of a first user parameter in the set of first parameters, changing the first user parameter in accordance with a change operation on the first control by the user, and strengthening, by the first unit, signal components within a particular frequency band of the sound signal, in accordance with the set of first parameters including the first user parameters.

A stethoscope according to exemplary embodiments of the inventive concept includes a chestpiece for examining a patient by contacting him on the body, a microphone unit for receiving a doctor's voice, a first headset unit connected to the doctor's ears, and a second headset unit connected to the patient's ears, and a guiding unit guiding the chestpiece and the microphone unit to be each connected to at least one of the first headset unit and the second headset unit. Such the composition of the stethoscope enables the patient to listen to the doctor's voice as well as the auscultation sound gathered through the chestpiece, selectively.