Accession Number:

ADA073501

Title:

A Balanced, Switching Audio Modulator with High Carrier Rejection,

Descriptive Note:

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER SAN DIEGO CA

Personal Author(s):

Report Date:

1967-09-01

Pagination or Media Count:

25.0

Abstract:

In the conversion and analysis of active sonar data, it is often desirable to up or down shift the frequency spectrum of analog data to a more easily handled band. One method of doing this is to use an analog multiplier to heterodyne the signal. However, this method has the disadvantages of non-linearity, sensitivity to thermal changes and high cost. The above difficulties may be overcome by using a switching modulator. This device multiplies the input data signal by a square wave of any chosen frequency. The output of the modulator can then be passed through a bandpass filter to select the upper or lower sideband of the heterodyned signal. The filter output will be an up or down shifted version of the input signal.

Subject Categories:

  • Electrical and Electronic Equipment
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE