The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 1988
Filed:
Oct. 28, 1985
Abstract
A scrambler system comprises in a transmitter part thereof as oscillator circuit for generating a local oscillation signal, a frequency dividing circuit for obtaining a frequency divided signal by frequency-dividing the local oscillation signal by 1/N, a triangular wave signal generating circuit for converting the frequency divided signal into a triangular wave signal and for controlling the oscillation frequency of the oscillator circuit by the triangular wave signal, a multiplying circuit for obtaining a frequency converted audio signal by multiplying the local oscillation signal with an input audio signal which is to be scrambled, a pilot signal generating circuit for generating from the frequency divided signal a pilot signal having a single frequency, and an adding circuit for obtaining a scrambled signal for transmission by adding the pilot signal and the frequency converted audio signal. A key is used for de-scrambling the scrambled signal in a receiver part of the scrambler system.