Patents by Inventor Vishu R. Viswanathan
Vishu R. Viswanathan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20090323679Abstract: Packets of real-time information are sent with a source rate greater than zero kilobits per second, and a time or path or combined time/path diversity rate initially being zero kilobits per second. This results in a quality of service QoS, optionally measured at the sender or the receiver. When the QoS is on an unacceptable side of a threshold of acceptability, the sender sends diversity packets at an increased rate. Increasing the diversity rate while either reducing or maintaining the overall transmission rate is new. CELP-based multiple-description data partitioning sends the base or important information plus a subset of fixed excitation in one packet and sends the base or important information plus the complementary subset of fixed excitation in another packet. Reconstruction produces acceptable quality when only one of the two packets is received and better quality when both packets are received. Reconstruction provides for single and multiple lost packets.Type: ApplicationFiled: September 8, 2009Publication date: December 31, 2009Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Publication number: 20090268724Abstract: Packets of real-time information are sent with a source rate greater than zero kilobits per second, and a time or path or combined time/path diversity rate initially being zero kilobits per second. This results in a quality of service QoS, optionally measured at the sender or the receiver. When the QoS is on an unacceptable side of a threshold of acceptability, the sender sends diversity packets at an increased rate. Increasing the diversity rate while either reducing or maintaining the overall transmission rate is new. CELP-based multiple-description data partitioning sends the base or important information plus a subset of fixed excitation in one packet and sends the base or important information plus the complementary subset of fixed excitation in another packet. Reconstruction produces acceptable quality when only one of the two packets is received and better quality when both packets are received. Reconstruction provides for single and multiple lost packets.Type: ApplicationFiled: June 30, 2009Publication date: October 29, 2009Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 7606164Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes initially generating packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11) initially being at least zero kilobits per second. Sending the packets results in a quality of service QoS, optionally measured at the sender (311). Rate/diversity adaptation decision may be performed at receiver (361?) instead. When the QoS is on an unacceptable side of a threshold of acceptability (Th1), the sender increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the increased diversity rate (d22). Increasing the diversity rate (d11 to d22) while either reducing or maintaining the overall transmission rate (sij+dij) is an important new improvement.Type: GrantFiled: March 31, 2004Date of Patent: October 20, 2009Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 7574351Abstract: Packets of real-time information are sent with a source rate greater than zero kilobits per second, and a time or path or combined time/path diversity rate initially being zero kilobits per second. This results in a quality of service QoS, optionally measured at the sender or the receiver. When the QoS is on an unacceptable side of a threshold of acceptability, the sender sends diversity packets at an increased rate. Increasing the diversity rate while either reducing or maintaining the overall transmission rate is new. CELP-based multiple-description data partitioning sends the base or important information plus a subset of fixed excitation in one packet and sends the base or important information plus the complementary subset of fixed excitation in another packet. Reconstruction produces acceptable quality when only one of the two packets is received and better quality when both packets are received. Reconstruction provides for single and multiple lost packets.Type: GrantFiled: March 30, 2004Date of Patent: August 11, 2009Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Publication number: 20040252700Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes initially generating packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11) initially being at least zero kilobits per second. Sending the packets results in a quality of service QoS, optionally measured at the sender (311). Rate/diversity adaptation decision may be performed at receiver (361′) instead. When the QoS is on an unacceptable side of a threshold of acceptability (Th1), the sender increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the increased diversity rate (d22). Increasing the diversity rate (d11 to d22) while either reducing or maintaining the overall transmission rate (sij+dij) is an important new improvement.Type: ApplicationFiled: March 30, 2004Publication date: December 16, 2004Inventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Publication number: 20040252701Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes initially generating packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11) initially being at least zero kilobits per second. Sending the packets results in a quality of service QoS, optionally measured at the sender (311). Rate/diversity adaptation decision may be performed at receiver (361′) instead. When the QoS is on an unacceptable side of a threshold of acceptability (Th1), the sender increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the increased diversity rate (d22). Increasing the diversity rate (d11 to d22) while either reducing or maintaining the overall transmission rate (sij+dij) is an important new improvement.Type: ApplicationFiled: March 31, 2004Publication date: December 16, 2004Inventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6804244Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: October 12, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6801532Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: October 5, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6801499Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: October 5, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6765904Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: July 20, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6757256Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: June 29, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6744757Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: June 1, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6678267Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: January 13, 2004Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6574213Abstract: A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of realtime information but also sends diversity packets at the diversity rate as increased (d22).Type: GrantFiled: December 14, 1999Date of Patent: June 3, 2003Assignee: Texas Instruments IncorporatedInventors: Krishnasamy Anandakumar, Vishu R. Viswanathan, Alan V. McCree
-
Patent number: 6418406Abstract: An improvement in the synthesis of high-pitched voices and sounds is provided by downshifting the pitch 11 of the original input voice or sound before LPC analysis 13. This downshifting of the pitch is provided by upsampling 21, low pass filtering 22, downsampling 23, and performing time scale modification 24.Type: GrantFiled: August 14, 1996Date of Patent: July 9, 2002Assignee: Texas Instruments IncorporatedInventors: Vishu R. Viswanathan, Wai-Ming Lai
-
Patent number: 6263307Abstract: An acoustic noise suppression filter including attenuation filtering with a noise-free estimate based on a codebook of line spectral frequencies.Type: GrantFiled: April 19, 1995Date of Patent: July 17, 2001Assignee: Texas Instruments IncorporatedInventors: Levent M. Arslan, Alan V. McCree, Vishu R. Viswanathan
-
Patent number: 6111181Abstract: A synthesis of percussion musical instruments sounds is provided using a microprocessor (17) that implements an all pole lattice filter and applying either a single impulse signal to the filter or N samples of an excitation signal sequence to the filter by a memory (19). The coefficients of the filter are determined by storing digital samples (501) of desired musical note from a desired percussion instrument, generating a Fourier transform to get a spectrum (502), picking the peaks of the spectrum (503) to select the most prominent components in the spectrum and determining wanted frequencies for decaying sine waves and for the frequencies finding the time envelope and estimating therefrom the pole radius.Type: GrantFiled: May 4, 1998Date of Patent: August 29, 2000Assignee: Texas Instruments IncorporatedInventors: Michael W. Macon, Wai-Ming Lai, Alan V. McCree, Vishu R. Viswanathan
-
Patent number: 5960010Abstract: An improved error detection and error concealment for Viterbi decoding of convolutionally encoded data is provided. The most sensitive part of the data is parity encoded and sent with parity and this data with the next most sensitive data are convolutionally encoded and sent with the least sensitive data over a transmission channel to a receiver. At the receiver the convolutionally encoded data is decoded using the Viterbi algorithm. The decoder compares the parity computed from decoded data with the decoded parity and if they are not equal generates a Bad Frame Indicator (BFI) flag and also determines which decoded parameters are likely bad and hence generates a Bad Parameter Indicator (BPI) flag for those parameters, by determining the confidence levels for the parameters and comparing against pre-selected thresholds. The decision to discard a decoded parameter is dependent on the BFI flag and the BPI flag of that parameter.Type: GrantFiled: May 2, 1997Date of Patent: September 28, 1999Assignee: Texas Instruments IncorporatedInventors: Christine N. Liu, Wilfrid P. LeBlanc, Vishu R. Viswanathan
-
Patent number: 5806027Abstract: A novel approach to parameter encoding is presented which improves coding efficiency and performance by exploiting the variable rate nature of certain classes of signals. This is achieved using an interpolative variable frame-rate breakpointing scheme referred to as adaptive frame selection (AFS). In the approach described in this report, frame selection is achieved using a recursive dynamic programming algorithm; the resulting parameter encoding system is referred to as adaptive frame selection using dynamic programming (AFS/DP). The AFS/DP algorithm determines optimal breakpoint locations in the context of parameter encoding using an arbitrary objective performance measure, and operates in a fixed bit-rate, fixed-delay context with low computational requirements. When applied to the problem of low bit-rate coding of speech spectral and gain parameters, the AFS/DP algorithm is capable of improving the perceptual quality of coded speech and robustness to quantization errors over fixed frame-rate approaches.Type: GrantFiled: September 19, 1996Date of Patent: September 8, 1998Assignee: Texas Instruments IncorporatedInventors: E. Bryan George, Alan V. McCree, Vishu R. Viswanathan
-
Patent number: 5706395Abstract: An acoustic noise suppression filter including attenuation filtering with a noise suppression factor depending upon the ratio of estimated noise energy of a frame divided by estimated signal energy.Type: GrantFiled: April 19, 1995Date of Patent: January 6, 1998Assignee: Texas Instruments IncorporatedInventors: Levent M. Arslan, Alan V. McCree, Vishu R. Viswanathan