FM modulator
US6211748A · kind A · utility
0Cited by
1References
3Claims
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Assignee
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Key dates
| Filing date | Feb 15, 2000 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Feb 15, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/095
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The signal source of the reference frequency of a PLL 20 is composed of a VCO 24. A VCO 14 is provided. A first audio signal (L+R) is supplied to the VCO 24 so as to control its oscillation frequency f.sub.24. A second audio signal (L-R) is supplied to the VCO 14, so that an FM signal S.sub.SUB is formed whose occupied frequency band is outside the band of the first audio signal (L+R). This FM signal S.sub.SUB is supplied to an adder 26, hereby added to a phase comparison output that is supplied to a VCO 21 from a low-pass filter, and then supplied to the VCO 21.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.