Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: In an embodiment, a circuit arrangement for active noise cancellation, comprises a first input (E1) for supplying a playback signal (Spb), a second input (E2) for supplying a sensor signal (Sanc), a first and a second terminal (A1, A2) 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 (Sanc1, Sanc2) as a function of the sensor signal (Sanc), wherein the first and the second input (E1, E2) are coupled to the first and the second terminal of the output (A1, A2) by means of the compensating device (Komp) in such a way that a virtual playback signal (Ssp1) is provided at the first terminal (A1) of the output (A1, A2) and a superposition signal (Ssp2) is provided at the second terminal (A2) of the output (A1, A2) such that a differential signal between the virtual playback signal (Ssp1) and the superposition signal (Ssp2) can be fed to the loudspeaker.

Abstract: A circuit arrangement includes a load current controller (10a) and a monitoring device (11a, 11b). The load current controller (10a) has its input side connected to a first reference signal connection (A6) and a load reference connection (A2), 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 (A1) 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 (11a, 11b) has its input side coupled to the output of the load current controller (10a) and to one of the inputs of the load current controller (10a). The monitoring device (11a, 11b) is designed to provide a feedback signal (RS) at an output coupled to the feedback connection (A3) on the basis of a comparison of the control signal (IB) with the load current (IL).

Abstract: A voltage supply arrangement for driving an electrical load, particularly a light-emitting diode, comprises a driver circuit (11). The driver circuit (11) features a driver output (12) for making available a driver signal (SB) for controlling a load path (34) that comprises a means (36) for connecting the electrical load (37). The driver circuit (11) furthermore comprises a device (13) for determining an AC signal component of the driver signal (SB), the input side of which is coupled to the driver output (12) 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 (34) can be adjusted.

Abstract: 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.

Abstract: A voltage supply arrangement for driving an electrical load, particularly a light-emitting diode, comprises a driver circuit (11). The driver circuit (11) features a driver output (12) for making available a driver signal (SB) for controlling a load path (34) that comprises a means (36) for connecting the electrical load (37). The driver circuit (11) furthermore comprises a device (13) for determining an AC signal component of the driver signal (SB), the input side of which is coupled to the driver output (12) 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 (34) can be adjusted.

Abstract: A set of headphones (1) comprises a connector (15) with a first connection contact (16, 17) and a second connection contact (18) as well as a loudspeaker (3, 5), which is connected to the first connection contact (16, 17) in order to supply a loudspeaker signal. The set of headphones (1) furthermore comprises a first and a second digital microphone (7, 8, 9), each of which is set up to generate a digital microphone signal, in particular with a binary bit stream. A multiplexer (23), which is coupled, at an output, to the second connection contact (18), is set up to generate a coded multiplex signal at the output on the basis of the microphone signals.

Abstract: In an embodiment, a circuit arrangement for active noise cancellation, comprises a first input (E1) for supplying a playback signal (Spb), a second input (E2) for supplying a sensor signal (Sanc), a first and a second terminal (A1, A2) 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 (Sanc1, Sanc2) as a function of the sensor signal (Sanc),wherein the first and the second input (E1, E2) are coupled to the first and the second terminal of the output (A1, A2) by means of the compensating device (Komp) in such a way that a virtual playback signal (Ssp1) is provided at the first terminal (A1) of the output (A1, A2) and a superposition signal (Ssp2) is provided at the second terminal (A2) of the output (A1, A2) such that a differential signal between the virtual playback signal (Ssp1) and the superposition signal (Ssp2) can be fed to the loudspeaker.

Abstract: A circuit arrangement comprises a load current controller (10a) and a monitoring device (11a, 11b). The load current controller (10a) has its input side connected to a first reference signal connection (A6) and a load reference connection (A2), 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 (A1) 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 (11a, 11b) has its input side coupled to the output of the load current controller (10a) and to one of the inputs of the load current controller (10a). The monitoring device (11a, 11b) is designed to provide a feedback signal (RS) at an output coupled to the feedback connection (A3) on the basis of a comparison of the control signal (IB) with the load current (IL).

Abstract: 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).

Abstract: A circuit array controls operation of two loads that operate with a rectified AC voltage. The circuit array includes a semiconductor switch on a circuit path with the two loads and a control unit to generate a switch control signal that controls the semiconductor switch. The control unit includes a phase detection device to detect whether a phase of the AC voltage is positive or negative, and to output a detection signal that is based on whether the phase is positive or negative, and a logic unit to generate the switch control signal based on load control signals and the detection signal.

Abstract: An output stage includes a system input and a system output, a first transistor having a first control input and a first controlled path, and a second transistor having a second control input and a second controlled path. The second controlled path is in series with the first controlled path and the system output. A first current-controlled voltage source has an input that is electrically connected to the system input. The first current-controlled voltage source has an output that is electrically connected to the first control input of the first transistor. A second current-controlled voltage source has an input that is electrically connected to the system input. The second current-controlled voltage source has an output that is electrically connected to the second control input of the second transistor.

Abstract: An output stage includes a system input and a system output, a first transistor having a first control input and a first controlled path, and a second transistor having a second control input and a second controlled path. The second controlled path is in series with the first controlled path and the system output. A first current-controlled voltage source has an input that is electrically connected to the system input. The first current-controlled voltage source has an output that is electrically connected to the first control input of the first transistor. A second current-controlled voltage source has an input that is electrically connected to the system input. The second current-controlled voltage source has an output that is electrically connected to the second control input of the second transistor.

Abstract: In a digital-to-analog converter including an integrated test circuit, a digital input and an analog output, a comparator (5) capable of being connected with the analog output (4) and including a connection (7) for a reference voltage source, a digital test connection (11) and a logic element is provided, the logic element being connected with the test connection (11) for emitting the digital value 0 or 1 as a function of the difference between the voltage at the analog output (4) and the reference voltage.

Abstract: A circuit array controls operation of two loads that operate with a rectified AC voltage. The circuit array includes a semiconductor switch on a circuit path with the two loads and a control unit to generate a switch control signal that controls the semiconductor switch. The control unit includes a phase detection device to detect whether a phase of the AC voltage is positive or negative, and to output a detection signal that is based on whether the phase is positive or negative, and a logic unit to generate the switch control signal based on load control signals and the detection signal.

Abstract: In a digital-to-analog converter including an integrated test circuit, a digital input and an analog output, a comparator (5) capable of being connected with the analog output (4) and including a connection (7) for a reference voltage source, a digital test connection (11) and a logic element is provided, the logic element being connected with the test connection (11) for emitting the digital value 0 or 1 as a function of the difference between the voltage at the analog output (4) and the reference voltage.

Abstract: An analog/digital converter includes a first transfer circuit which receives an input voltage and outputs an output clock signal having a phase delay that is dependent on the input voltage, a second transfer circuit which receives a reference voltage and an input clock signal and outputs a reference clock signal having a phase delay that is dependent on the reference voltage, and a comparator which compares the output clock signal and the reference clock signal and outputs a digitally-coded output signal that is based on the result of the phase comparison of the output clock signal and the reference clock signal.

Abstract: An analog/digital converter includes a first transfer circuit which receives an input voltage and outputs an output clock signal having a phase delay that is dependent on the input voltage, a second transfer circuit which receives a reference voltage and an input clock signal and outputs a reference clock signal having a phase delay that is dependent on the reference voltage, and a comparator which compares the output clock signal and the reference clock signal and outputs a digitally-coded output signal that is based on the result of the phase comparison of the output clock signal and the reference clock signal.