Polarity-independent transmission system
US6658120B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 8, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | May 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A generally asymptotic incoming audio signal is split into positive and negative components. Two separate polarity-independent variable-gain amplifiers act upon the positive and negative components of the signal. A positive (negative) peak rectifier circuit monitors the positive (negative) output component of the signal. Each rectifier has a comparator amplifier that generates an error voltage. The error voltages assign gain factors to the positive (negative) variable gain amplifiers, thereby ensuring that the peak amplitudes of the positive (negative) are the same. A combining amplifier sums the positive (negative) components of the signal to form an amplitude symmetric signal. This signal may be used to modulate a radio frequency carrier to its maximum potential regardless of input signal waveform asymmetry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.