3784747

Information

• Patent Grant
• 3784747

• References
• Source

• Patent Number

  3,784,747

• Date Filed

  Not available

• Date Issued

  Tuesday, January 8, 1974
  51 years ago

• CPC

  • H04M9/082 - using echo cancellers
  • H04B3/20 - Reducing echo effects or singing Opening or closing transmitting path Conditioning for transmission in one direction or the other
  • H04M9/087 - using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
  • H04R3/02 - for preventing acoustic reaction
  • G10L2021/02082 - the noise being echo, reverberation of the speech
  • G10L2021/02087 - the noise being separate speech

• US Classifications

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