Audio signal identification using code labels inserted in the audio signal
US6338037B1 · kind B1 · utility
24Cited by
20References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1999 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Jan 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/31
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an arrangement for decoding code labels embedded in audio signals by inserting signal bursts at selected frequencies into notch frequencies in the audio signal, problems of speed variations in the device producing the audio signal creating notch frequency variation are overcome by providing a plurality of decoders in parallel receiving an incoming signal, each decoder having notch frequencies incrementally displaced from those of the other decoders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.