Speech processing system
US3974336A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | May 27, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/90
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system of removing quantizing noise signals between words of an infinite-clipping speech system is disclosed. Speech signals are quantized in amplitude and in time without substantial loss of intelligibility. The speech signal and a square-wave squelch signal of relatively high frequency are added together, and the sum is amplified, clipped and quantized in time. Timing information from the quantized signal is used to detect the presence of the squelch signal. This information, together with the quantized signal is fed to a tri-level signal generator which generates a high output signal level when the speech signal is high, a low output signal level when the speech signal is low, and a zero level signal when the squelch signal is present, thereby removing all noise signals between words.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.