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:
Oct. 25, 1983
Filed:
Feb. 02, 1981
Joseph K Huffman, Kirkland, WA (US);
Teltone Corporation, Kirkland, WA (US);
Abstract
A phase jitter detector that is ideally suited for use in combination with tone receivers (e.g., tone-to-pulse converters) to provide a speech immune tone detection system or in a measuring instrument to provide a direct measurement of the signal-to-noise ratio (SNR) of a signal is disclosed. In either application, the phase jitter detector can be implemented in either phase locked loop or digital logic form. Regardless of how implemented, the phase jitter detector determines the phase jitter of an incoming signal by first squaring the signal (by passing the incoming signal through a high gain amplifier that limits the signal, for example). After squaring, the phase jitter of the squared signal is determined by: (1) determining the phase deviation of each cycle of the squared signal with respect to the average frequency of the squared signal over a predetermined number of cycles; and (2) combining the phase deviation and the predetermined number of cycles information to determine phase jitter. In tone detection system applications, the phase jitter information is used to control whether or not a tone receiver is to complete a tone conversiono sequence. In SNR measuring applications, the phase jitter information is converted into SNR form and displayed.