3571515

Information

• Patent Grant
• 3571515

• References
• Source

• Patent Number

  3,571,515

• Date Filed

  Not available

• Date Issued

  Tuesday, March 16, 1971
  53 years ago

• CPC

  • H04B14/066 - using differential modulation with several bits [NDPCM]
  • G10L19/02 - using spectral analysis
  • G10L21/00 - Processing of the speech or voice signal to produce another audible or non-audible signal
  • H04B1/66 - for reducing bandwidth of signals for improving efficiency of transmission

• US Classifications

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