Bizarre Patents
A gun that fires a missile, powered by gas "discharged by the operator of the toy."
PatentStorm News
Make the Most of PatentStorm
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest patents by subscribing to an RSS feed.
Got questions? Ask a Patent Expert!
Registered users: Manage your profile, comments and alerts.
US Patent 6795004 - Delta-sigma modulation apparatus and signal amplification apparatus
US Patent Issued on September 21, 2004
Estimated Patent Expiration Date:
September 17, 2022Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 17, 2022Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA signal amplifier apparatus adapted for carrying out delta-sigma modulation of an input signal to carry out pulse width modulation (PWM) of that signal, to obtain a PWM signal, and to amplify this PWM signal so that a signal of a predetermined magnitude is obtained, wherein the signal amplifier apparatus includes a correction circuit for correcting an output of a quantizer provided in a delta-sigma modulation device. The correction circuit is installed in a feedback path with respect to the input side from the quantizer or immediately before a pulse width modulator to thereby correct distortion taking place in the amplifier. In addition, the signal amplifier apparatus invention compares PWM signals at the input and the output of the amplifier to correct the output of the quantizer that is provided in the delta-sigma modulation device, so as to cancel distortion taking place in the amplifier in accordance with respective rising time difference and falling time difference to thereby correct distortion. | InventorsAssigneeApplicationNo. 10416443 filed on 09/17/2002US Classes:341/143, Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)341/118, CONVERTER COMPENSATION341/120CONVERTER CALIBRATION OR TESTINGField of Search341/118, CONVERTER COMPENSATION341/120, CONVERTER CALIBRATION OR TESTING341/143Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)ExaminersPrimary: Tokar, MichaelAssistant: Nguyen, Linh Attorney, Agent or FirmUS Patent References5784017, Analogue and digital convertors using pulse edge modulators with non-linearity error correctionIssued on: 07/21/1998 Inventor: Craven6359575, Analog to digital converter having a digital to analog converter mode Issued on: 03/19/2002 Inventor: Knudsen6373417, Digital to analog converter using level and timing control signals to cancel noise Issued on: 04/16/2002 Inventor: Melanson6414613, Apparatus for noise shaping a pulse width modulation (PWM) signal and method therefor Issued on: 07/02/2002 Inventor: Midya, et al.6414614, Power output stage compensation for digital output amplifiers Issued on: 07/02/2002 Inventor: Melanson6480129, Methods and apparatus for correction of higher order delta sigma converters Issued on: 11/12/2002 Inventor: Melanson6573666, Digital regulation of fluorescent lamps Issued on: 06/03/2003 Inventor: Killat6657572Digital noise-shaping filter with real coefficients and method for making the same Issued on: 12/02/2003 Inventor: Lee , et al. International ClassH03M 300 |
