Patents Assigned to Niravoice, Inc.
  • Data compression system using frequency band translation and intermediate sample extrapolation
    Patent number: 4852129
    Abstract: A digital data transmission system for transmitting selected periodic ones of real data samples and intermediate extrapolated data samples. The transmitting end of the communication system includes means for sampling periodic ones of an information signal, an extrapolator for estimating intermediate samples between the selected periodic real samples, correction means for generating a correction value based upon the difference between extrapolated data and real data samples, and transmitting means that transmit periodic ones of real data samples and intermediate correction values. The receiving end includes means for receiving selected real digital data samples and the correction values, and a second extrapolator for estimating intermediate samples between the transmitted real data samples.
    Type: Grant
    Filed: July 21, 1986
    Date of Patent: July 25, 1989
    Assignee: Niravoice Inc.
    Inventor: Nira Schwartz
  • Technique for transmission of voice communications and apparatus useful therein
    Patent number: 4825451
    Abstract: Apparatus for transmission of communications including apparatus for transmitting samples of an analog signal by conversion of such samples from their original frequencies to lower frequencies, extrapolating from the samples at the lower frequencies and reconverting the extrapolated samples to the original frequencies.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: April 25, 1989
    Assignee: Niravoice, Inc.
    Inventor: Nira Schwartz
  • Modem compression system for telephone network
    Patent number: 4805208
    Abstract: Bit compression system for a telephone modem utilizing differential phase shift modulation of a low-frequency tone carrier to transmit dibit or tribit values. Instead of transmitting digitized samples of the tone carrier over a conventional T1 telephone network, the modem compression system tribit extracts the dibit or values from digitized samples of the tone carrier, and transmits assembled T1 data bytes in a data stream containing solely the data bits encoded by the modem. At the receiving end, a modem decompressor reconstructs the digitized samples of the tone carrier using the dibit or tribit values. The T1 telephone network then uses the reconstructed digitized samples to reproduce the analog tone carrier for the receiving modem. The modem compressing system also includes AGC circuit for normalizing the levels of the T1 data samples and a modem/voice data detector for alternately routing the T1 data samples to respective speech and modem compressors.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: February 14, 1989
    Assignee: Niravoice, Inc.
    Inventor: Nira Schwartz