3873772

Information

• Patent Grant
• 3873772

• References
• Source

• Patent Number

  3,873,772

• Date Filed

  Not available

• Date Issued

  Tuesday, March 25, 1975
  50 years ago

• CPC

  • G10L25/78 - Detection of presence or absence of voice signals
  • H04B3/20 - Reducing echo effects or singing Opening or closing transmitting path Conditioning for transmission in one direction or the other
  • H04Q1/4465 - the same frequency being used for all signalling information

• US Classifications

  • 379 - Telephonic communications
  • 704 - Data processing: speech signal processing, linguistics, language translation, and audio compression/decompression