摘要:
A method and a system for ultra-low-power acoustic sensor including a buffer transistor, which gate terminal is connected to a first terminal of a capacitive acoustic sensor, which drain terminal is connected via a load network to a power source and to an output terminal, and which source terminal is connected to the regulated current source, where the regulated current source is connected between the source terminal of the buffer transistor and a reference terminal, and where the reference terminal being connectable to a second terminal of the capacitive acoustic sensor.
摘要:
The present invention concerns a MEMS Microphone (1) comprising, a transducer element (2) for providing an electrical signal, a first part (3) for receiving the electrical signal from the transducer element (2) and for providing a processed signal, a second part (4) for receiving the processed signal from the first part (3) and for providing an output signal of the MEMS microphone (1), and a gain control unit (5) that is enabled to adjust a gain setting of the first part (3) and to adjust a gain setting of the second part (4). Further, another aspect of the present invention concerns a method of operating said MEMS microphone (1) comprising the step of adjusting a gain setting of the first part (3) and adjusting a gain setting of the second part (4).
摘要:
A method of sensing vibrations in the middle ear is presented. The method includes implanting a transducer in the middle ear. The transducer measures vibration, within a predetermined frequency range, of at least one component of the middle ear. The transducer has a resonance frequency within the predetermined frequency range, and further has a limited frequency response in a portion of the frequency range. The implanting includes operatively coupling the implant to the at least one component of the middle ear such that the limited frequency response of the transducer is complimentary to, and compensated by, the frequency characteristics of the at least one component of the middle ear.
摘要:
An electric potential fixing apparatus of the present invention is an electric potential fixing apparatus that is connected to a connection line (17) between two capacitances, the first capacitance (14) and the second capacitance (15) that is directly connected to the first capacitance, comprises the first high resistance (3), the second high resistance (4) that is connected directly to the first high resistance, a voltage dividing unit that outputs electric potential divided by the first high resistance and the second high resistance to the output terminal, the third capacitance (8) that is connected in parallel to at least either of the first high resistance and the second high resistance, and a voltage supply unit (1) operable to maintain constantly electric potential of the connection line between the two capacitances (14) and (15), holding combined total electric charge quantity of the first capacitance and the second capacitance, and the output terminal of the voltage supply unit is connected to a signal line between the two capacitances.
摘要:
Dans le domaine technique de la reproduction sonore au moyen de haut-parleurs electrostatiques a large bande passante on rencontre des problemes dans le circuit d'attaque. Le circuit d'attaque decrit permet d'eliminer les inconvenients que presentent les amplificateurs de l'art anterieur concus specialement, du type a transformateur elevateur, et de rendre les haut-parleurs electrostatiques plus competitifs du point de vue acoustique et economique. Les problemes resolus sont les suivants: obtenir une caracteristique egalisee de passage complementaire a la charge capacitive et a la resistance de radiation changeant radicalement sur toute la gamme audible-signaux sonores d'attaque precis a haute tension, d'un rendement eleve - acoustiquement "plat" (transitions douces d'amplitude, de phase et d'impedance), adaptation appropriee de l'impedance entre les amplificateurs conventionnels possedant une faible impedance et une faible tension d'entree et les haut-parleurs, un prix modere, un poids reduit et un encombrement limite. Le circuit d'attaque utilise deux transformateurs audio specialement concus (T1, T2) en liaison parallele-bilaterale comprenant des reseaux RC (R2, R3, C2, C3). Afin d'assurer une reponse optimale un transformateur (T1) travaille dans une plage de frequence allant de 30Hz a environ 5kHz, et l'autre transformateur (T2) possedant une impedance d'entree cooperative ajoutee (R1-C1) travaille dans une plage allant de quelques centaines de Hz jusqu'a 20kHz. Une conservation d'energie a resonance aux hautes frequences est utilisee.
摘要:
A microphone includes a first resistor circuit for receiving a bias voltage; an offset reduction circuit coupled to the first resistor circuit; a second resistor circuit coupled to the offset reduction circuit; an amplifier coupled to the second resistor circuit configured for receiving an input signal and generating an output signal; and a capacitor circuit coupled to the amplifier, the offset reduction circuit, and the second resistor circuit.
摘要:
A method is provided for a correction of an audio signal (AS) which is formed using an electroacoustic transducer. The method comprises producing a corrected audio signal (CAS) based on the audio signal (AS) according to the formal I: in which the coefficient B amounts from −10 to 0 and the coefficient C amounts from 0 to 0.04.
摘要:
A read out circuit for a sensor uses a feedback loop to bias the sensor to a desired operating point, such as the maximal possible sensitivity, but without the problem of an instable sensor position as known for the conventional read-out with constant charge. The reference bias to which the circuit is controlled is also varied using feedback control, but with a slower response than the main bias control feedback loop.
摘要:
A composite microphone comprises a flexible and stretchable substrate (22, 122, 250, 350, 450) with a grid of flexible and stretchable first and second conductors (31a,…,31e, 131a, 131g; 33a,…,33h, 133a, 133g). The first conductors (31a,…,31e, 131a, 131g) are arranged transverse to the second conductors (33a,…,33h, 133a, 133g). A plurality of acoustic sensors (40, 140) is each in connection with a respective pair of conductors in the grid.