Ams Ag

Austriamicrosystems Ag

Ams International Ag

Helmut Theiler

Herbert Lenhard

Josef Kriebernegg

Christian Halper

Peter Bliem

Manuel Hoerbinger

Bernhard Greimel-Làngover

Whitney Hernandez

Horst Gether

Bernhard Greimel-Längauer

Stefan Wiegele

Alexander Costa

Roberto Simmarano

A method of operating an optical proximity sensor of a computer device having a display, where the optical proximity sensor is located beneath or otherwise adjacent to the display. The method comprises obtaining a vertical synchronization signal from a display driver, and synchronizing periodic illumination of a light emitter of the optical proximity sensor with the vertical synchronization signal.

Optical proximity sensing with reduced pixel distortion

A sensor arrangement comprises an integrator with an integrator input, a sensor coupled to the integrator input, a balancing current generator coupled to the integrator input and a compensation current generator coupled to the integrator input.

Sensor arrangement and method for sensor measurement

An analog-to-digital converter (ADC) is based on single-bit delta-sigma quantization. The ADC includes an integrator, a threshold detector, a feedback block, a range control circuit and an output processing block. The ADC is configured to, based on its own generated digital bitstream, adjust the magnitude of a subtrahend signal in order to achieve autonomous auto-ranging of the ADC during the integration time of a measurement. In particular, the auto-ranging allows for the efficient conversion of an analog input signal with high dynamic range, for example ambient light, to a digital output signal.

Analog-to-digital converter and method to operate an analog-to-digital converter

A method for light sensing senses the light during a sub-frame of a picture frame operated display. The sensing is performed during an adaptive observation window which is determined in dependence on the duty cycle of the operation of the display. A calculation that uses the light sensed during the observation window and the light sensed during the sub-frame delivers a value indicative of the amount of received ambient light.

Method for sensing ambient light in a display

A host interface circuit operates in a power mode when connected to an accessory device compatible with a power supply via a first line of a data cable. During power mode, the host interface circuit couples a power regulator to the first line. The host interface circuit operates in a legacy mode when connected to an accessory device not compatible with such a power supply and couples the legacy terminal to the first line during legacy mode. An accessory interface circuit configured to operate in a power mode when connected to a host device capable of a power supply via a first line couples a power input of an active device to the first line and a data input of the active device to a second line during power mode.

Interface circuits and communication system for coupling a host device to an accessory device and method for communication between such devices

A set of headphones includes a connector with a first connection contact and a second connection contact as well as a loudspeaker, which is connected to the first connection contact in order to supply a loudspeaker signal. The set of headphones also includes a first and a second digital microphone, each of which is set up to generate a digital microphone signal, in particular with a binary bit stream. A multiplexer, which is coupled, at an output, to the second connection contact, is set up to generate a coded multiplex signal at the output on the basis of the microphone signals.

Headphones, audio device, audio system and method for transmitting signals

A host interface for a media device comprises a first and a second host audio terminal for receiving a first and a second analog audio signal, a first and a second connector audio terminal for connecting a first and a second pole of a four-pole connector, and a host control circuit. The host control circuit is adapted to detect whether a device requiring a supply signal over the four-pole connector is connected. If no such device is detected, the first and the second analog audio signal are passed to the first and the second connector audio terminal. If such a device is detected, the first connector audio terminal is connected to a supply terminal.

Host interface, accessory interface and method for managing a connection between a host interface and an accessory device

An active noise control arrangement has a signal input (SI), a microphone input (MI), a signal output (SO) and a digital interface (DI). A signal processing block (SP) coupled to the microphone input (MI) by means of an amplifier (MA) has a digitally adjustable gain and comprises combining means (CM) and a filter (TP). The signal processing block (SP) is configured to generate an output signal at the signal output (SO) as a function of an input signal at the signal input (SI) and an amplified microphone signal. A control block (CB) is coupled to the digital interface (DI) and configured to adjust the gain of the amplifier (MA).

Active noise control arrangement, active noise control headphone and calibration method

A communication system has a host communication circuit and a client communication circuit, which are connected to each other by means of a single signal wire. The host communication circuit generates a voltage modulated signal on the signal wire based on a reference clock signal, which in each clock cycle has a first period with a significant voltage change based on a clock edge of the reference clock signal, and a second period with a basically constant voltage variation. The host communication circuit (HCC) further can demodulate a current modulated signal received via the signal wire from the client communication circuit. The client communication circuit is configured to detect the significant voltage change in order to generate respective sync pulses in a sync signal, which is used to generate a client clock signal. A current modulation is performed by the client communication circuit based on the data to be transmitted a predetermined settling time after one of the sync pulses until the respective following sync pulse.

Host communication circuit, client communication circuit, communication system and communication method

A power supply circuit for supplying power to at least two loads which are connected to said power supply circuit comprises a current source which can be operated in a clocked manner and has a control input for adjusting the power. At least two load strings are connected in parallel between a power supply connection, which is coupled to the current source, and a reference connection. Each load string has a load and charge storage means which is connected in parallel with the load. A switch is used to selectively switch the current path of the load string. A sensor having a sensor resistor which is connected in the current path of the load string is used to detect a current flowing through the connected load string. Furthermore, the controlled power supply circuit comprises a control circuit which is coupled to the switch and to the sensor of each load string for the purpose of activating each load string in a time-multiplexed manner.

Controlled power supply circuit

In an embodiment, a circuit arrangement for active noise cancellation, comprises a first input (E) for supplying a playback signal (Spb), a second input (E) for supplying a sensor signal (Sanc), a first and a second terminal (A, A) of an output that is designed for being connected to a loudspeaker (Lsp) and a compensating device for respectively generating a first and a second noise signal (Sanc, Sanc) as a function of the sensor signal (Sanc), wherein the first and the second input (E, E) are coupled to the first and the second terminal of the output (A, A) by means of the compensating device (Komp) in such a way that a virtual playback signal (Ssp) is provided at the first terminal (A) of the output (A, A) and a superposition signal (Ssp) is provided at the second terminal (A) of the output (A, A) such that a differential signal between the virtual playback signal (Ssp) and the superposition signal (Ssp) can be fed to the loudspeaker.

Circuit arrangement and method for active noise cancellation

A circuit arrangement includes a load current controller () and a monitoring device (). The load current controller () has its input side connected to a first reference signal connection (A) and a load reference connection (A), the latter being able to be coupled to an output of the current source (SQn) and being designed to provide a control signal (IB) at an output which is coupled to a control connection (A) for controlling the current source (SQn). The control signal (IB) is determined on the basis of a comparison of a load current (IL) with a first reference signal (IL-REF, IREF, VREF). The monitoring device () has its input side coupled to the output of the load current controller () and to one of the inputs of the load current controller (). The monitoring device () is designed to provide a feedback signal (RS) at an output coupled to the feedback connection (A) on the basis of a comparison of the control signal (IB) with the load current (IL). The feedback connection (A) provides an external feedback signal (ERS) for adjusting a load voltage (VL) which drops across the current source (SQn) and the load (LK) coupled thereto.

Control loop arrangement, circuit arrangement and method of regulating a load-coupled current source and the supply voltage therefor

A voltage supply arrangement for driving an electrical load, particularly a light-emitting diode, comprises a driver circuit (). The driver circuit () features a driver output () for making available a driver signal (SB) for controlling a load path () that comprises a means () for connecting the electrical load (). The driver circuit () furthermore comprises a device () for determining an AC signal component of the driver signal (SB), the input side of which is coupled to the driver output () and at the output side of which can be tapped a measurement signal (SI) that is dependent on the AC signal component of the driver signal (SB) and according to which a supply voltage (VOUT) of the load path () can be adjusted.

Growing community of inventors

Lieboch, Austria

Helmut Theiler