4results about "Limiting amplitude without controlling loop" patented technology

The present application discloses an audio signal processing method and an audio signal processing device for carrying out the audio signal processing method. The audio signal processing method comprises: receiving an audio signal and compressing the audio signal to produce a first compressed signal; calculating a duration for which a power value of the first compressed signal equals a first power threshold; determining whether the duration exceeds a first time threshold; if the duration exceeds the first time threshold, compressing the first compressed signal to produce a second compressed signal; and amplifying and outputting the second compressed signal. The method described above reduces the volume and prevents damage to electronic components during prolonged high-power operation of the loudspeaker system.

This application relates to methods and apparatus for power limiting for amplifiers. An amplifier is configured to receive an input supply voltage and to draw, in use, an amplifier input current resulting in an amplifier input power. A power limiter is configured to monitor an indication of the amplifier input power, determine a first signal limit based on said indication of the amplifier input power and a pre-set limit and apply regulation to the input signal to provide a regulated input signal for input to the amplifier that does not exceed the first signal limit.

An amplifier circuit arrangement for amplifying at least one input signal to an output signal for delivery to a load. The amplifier circuit arrangement includes at least one four-port hybrid coupler, a main amplifier having an input terminal for receiving a first input signal and coupled to a first port of the hybrid coupler, an auxiliary amplifier having an input terminal for receiving a second input signal and coupled to the second port of the hybrid coupler, a negative resistance amplifier circuit coupled to the third port of the hybrid coupler. The negative resistance amplifier circuit receives a signal from the hybrid coupler via the third port and returns an amplified signal back to the third port of the hybrid coupler. At least one of the auxiliary amplifier and negative resistance amplifier circuit selectively operates in combination with the main amplifier circuit.

The present invention relates to a RF amplifier circuit arrangement for amplifying at least one RF input signal to an output signal for delivery to a load. The RF amplifier circuit arrangement uses a simple and low-cost RF clipping circuit within a load modulated balanced amplifier arrangement which passes RF input signals to output linearly up to the signal input reaches a predefined amplitude. Beyond that predefined amplitude the clipping circuit clips excess amplitudes. The present invention further relates to an electronic device.