TONE DECODER HAVING PLURAL REFERENCE TONES

• US 3,493,934 A
• Filed: 01/06/1967
• Issued: 02/03/1970
• Est. Priority Date: 01/06/1967
• Status: Expired due to Term

• Current Assignee: Walter K. French
• Original Assignee: Walter K. French
• Inventors: French, Walter K.
• Application Number:
  US04/607,794
• Time in Patent Office: 1,124 Days
• US Class Current: 340/13.36
• CPC Class Codes: H04L 27/14 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/144 with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements

Claims