Stmicroelectronics S.r.l.

Pietro Mario Adduci

Edoardo Botti

Giovanni Gonano

Flavio Polloni

Giovanni Gognano

The present invention relates to a method and a circuit for testing a tweeter. The tweeter is part of a loudspeaker system. The method includes the steps of: applying a high-frequency voltage signal to one terminal of the tweeter, whereby the high-frequency voltage signal is generated by first electronic means. The method also includes applying a constant voltage signal to the other terminal of the tweeter, whereby the constant voltage signal is generated by second electronic means. The method includes measuring a current (I) that flows through the tweeter into the second electronic means and determining a connect/disconnect state of the tweeter from the value of the current.

Method and circuit for testing an audio high-frequency loudspeaker being part of a loudspeaker system

An electronic circuit is disclosed for driving a switching amplifier. The electronic circuit is configured for generating, when operating in a switch-on mode, a driving signal for driving the switching amplifier. The driving signal carries a plurality of pulses having: an pulse width increasing between contiguous pulses of the plurality of pulses according to a step value having modulus equal to two and odd values; a polarity alternating between the contiguous pulses.

Electronic circuit for driving a switching amplifier

The present invention relates to a method and a circuit for testing a tweeter, said tweeter being part of a loudspeaker system, wherein the method includes the steps of: applying a high-frequency voltage signal to one terminal of said tweeter, said high-frequency voltage signal being generated by first electronic means; applying a constant voltage signal to the other terminal of said tweeter, said constant voltage signal being generated by second electronic means; measuring a current Ithat flows through said tweeter into said second electronic means; determining a connect/disconnect state of said tweeter from the value of said current.

A method for testing the operating conditions of an electric network, including at least one operating state, including the steps of providing a voltage signal (v(t)) to a network load and measuring the instantaneous current signal (i(t)) circulating in the load, delaying the instantaneous current signal (i(t)) to generate an instantaneous current signal delayed ((i(t+&#x3c4;)) by a predetermined amount of time (&#x3c4;), the predetermined amount of time (&#x3c4;) being a function of the operating state of said load, the method including the steps of calculating, within a predetermined measurement time (Tm), an admittance ratio (G(&#x3c4;)) between the mean of the product of the voltage signal (v(t)) and the delayed instantaneous current signal (i(t+&#x3c4;)), and the mean of the square of the voltage signal (v(t)), and to compare the value of the admittance ratio (G(&#x3c4;)) with a range of predetermined values (Gmin,Gmax) to determine the operating state of the electric network.

Method and apparatus for testing the operating conditions of an electric network

The present disclosure relates to an integrated circuit and a package on which such integrated circuit is placed, the latter having a power output stage, at least one first pad, one second pad and one drive circuit for driving said power output stage, wherein the integrated circuit is characterized in that it has at least one additional third pad, other than said at least one first and said at least one second pads, said drive circuit being electrically coupled between said at least one third pad and said power output stage.

Power integrated circuit with high insensitivity to parasitic inductances of wires for connection to a package and package for said integrated circuit

A process and apparatus for generating an output signal whose frequency varies according to a modulation scheme, the process including the steps of providing a dither generator for receiving a first input signal representative of a clock frequency and for generating, according to the modulation scheme, a dithered output signal representative of the first signal at a dithered frequency; providing a DSP for receiving the following input signals: the signal at the dithered frequency and a second signal representative of a clock frequency, the DSP adapted to generate a processed output signal representative of the maximum frequency of the second signal; wherein the modulation scheme has a periodic ultrasonic modulating wave.

Clock dithering process for reducing electromagnetic interference in D/A converters and apparatus for carrying out such process

A feedback architecture for a PWM switching audio amplifier is, capable of compensating the effects of the demodulation filter through at least two feedback paths of the voltage applied to a load without degrading the overall loop gain of the device. Each of the feedback paths may include a respective network or filter for compensating a respective frequency pole of the cascade low-pass filter+load and establishing a certain band pass. These networks or filters may be passive networks.

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Settimo Milanese, Italy

Pietro Mario Adduci