Delta modulated digital signal detector
US4174502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1978 |
| Grant date | Nov 13, 1979 |
| Priority date | — |
| Expiry date | Oct 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/20
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A detector for delta modulated digital signals is disclosed that provides a signal quality voltage having a magnitude that is indicative of the degree of quality of the detected delta modulated digital signal. The detector totalizes the number of bit transitions occurring in successive N bit intervals. If successive totalized numbers of bit transitions are outside of a predetermined range centered about one-half of N, the detector provides a detect indication signal indicating that the delta modulated digital signal is present. Otherwise, a random or pseudorandom signal such as noise or error bursts may be present. Digital circuitry provides the detect indication signal with a logical high state when successive totalized numbers of bit transitions are outside of the predetermined range, and a logical low state when succesive totalized numbers of bit transitions are within the predetermined range. The detect indication signal may be further integrated and amplified to provide a signal quality voltage which has a magnitude indicative of the quality or signal to noise ratio of the detected delta modulated digital signal. The signal quality voltage may be advantageously utilized in a r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.