Dooper
Lusten Dooper, Nijmegen NL
Patent application number | Description | Published |
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20080197935 | Arrangement for Pulse-Width Modulating an Input Signal - An arrangement for pulse-width modulating an analog or digital input signal is provided. The non-linear distortion generated in the pulse-width modulator is precompensated by applying a signal with reversed error to the pulse-width modulator. The signal with reversed error is generated by a further pulse-width modulator that receives the input signal and whose output signal is subtracted from twice the input signal. The arrangement may e.g. be used to drive class D audio amplifiers. | 08-21-2008 |
Lutsen L.a.h. Dooper, Brummen NL
Patent application number | Description | Published |
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20080315945 | Arrangement for Amplifying a Pwm Input Signal - A pulse-width modulation (PWM) amplifier comprises a feedback loop for reshaping the pulses of the PWM input signal to correct timing and amplitude errors in the class D output stage of the amplifier by means of an error correction signal. In such an amplifier the feedback loop gives a substantial amount of base-band noise when the pulse-period of the PWM input signal is not constant, which is especially the case when the PWM signal originates from a noise shaper. The invention reduces this noise by modifying the reshaping gain of the amplifier with a pulse-period proportional signal. | 12-25-2008 |
Lutsen L. A. H. Dooper, Brummen NL
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20100289546 | DIGITAL SIGNAL CONVERTER - A digital signal converter (CNV) converts a digital input signal (PCM) into a pulse width modulated signal (PWM), which is a binary signal that comprises pulses of varying width. The digital signal converter can operate in a signal mode and a transition mode. In the transition mode, the digital converter provides the pulse width modulated signal (PWM) by applying an anti-transient noise shaping function (NSH | 11-18-2010 |
Lutsen Ludgerus Albertus Hendrikus Dooper, Brummen NL
Patent application number | Description | Published |
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20090315623 | CLASS D AUDIO AMPLIFIER - A class D amplifier ( | 12-24-2009 |
20110012677 | CURRENT SENSING - A switching amplifier comprising: an output driving circuit ( | 01-20-2011 |
20120134514 | AMPLIFIER AND AMPLIFIER CONTROL METHOD - Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed. | 05-31-2012 |
Lûtsen Ludgerus Albertus Hendrikus Dooper, Brummen NL
Patent application number | Description | Published |
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20110221540 | PULSE DENSITY MODULATION METHOD AND APPARATUS - A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value. | 09-15-2011 |