Accession Number:

AD0683979

Title:

CERTAIN QUESTIONS OF SOUND SIGNAL IDENTIFICATION,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1968-02-23

Pagination or Media Count:

10.0

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 computers 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

Subject Categories:

  • Acoustics
  • Bionics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE