CERTAIN QUESTIONS OF SOUND SIGNAL IDENTIFICATION,
Abstract
The article deals with the possibilities of constructing a device recognizing various acoustic signals whose characteristics display certain stationary parameters. The authors experimented with a specially built converter of acoustic signals to digital data, whose upper limit of conversion frequency was 20 kilo-cps. This converter operated on the principle of pulse-time coding and it assured the automatic insertion of digital data onto the magnetic tape of a digital electronic computer, with every one-minute interval of recording being represented in the computer's memory by 1,200,000 ordinates recorded in 5-unit binary code. The internal structure of the acoustic signals was analyzed according to the results of general harmonic analysis, involving the computation of a series of ordinates of the acoustic spectrum, correlation function and spectral density. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 23, 1968
- Accession Number
- AD0683979
Entities
People
- A. A. Nigai
- D. N. Kartashov
- V. Ya. Petrov
Organizations
- National Air and Space Intelligence Center