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Kandhadai, CA
Ananthapadmanabhan A. Kandhadai, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090187409 | METHOD AND APPARATUS FOR ENCODING AND DECODING AUDIO SIGNALS - Techniques for efficiently encoding an input signal are described. In one design, a generalized encoder encodes the input signal (e.g., an audio signal) based on at least one detector and multiple encoders. The at least one detector may include a signal activity detector, a noise-like signal detector, a sparseness detector, some other detector, or a combination thereof. The multiple encoders may include a silence encoder, a noise-like signal encoder, a time-domain encoder, a transform-domain encoder, some other encoder, or a combination thereof. The characteristics of the input signal may be determined based on the at least one detector. An encoder may be selected from among the multiple encoders based on the characteristics of the input signal. The input signal may be encoded based on the selected encoder. The input signal may include a sequence of frames, and detection and encoding may be performed for each frame. | 07-23-2009 |
| 20090319261 | CODING OF TRANSITIONAL SPEECH FRAMES FOR LOW-BIT-RATE APPLICATIONS - Systems, methods, and apparatus for low-bit-rate coding of transitional speech frames are disclosed. | 12-24-2009 |
| 20090319262 | CODING SCHEME SELECTION FOR LOW-BIT-RATE APPLICATIONS - Systems, methods, and apparatus for low-bit-rate coding of transitional speech frames are disclosed. | 12-24-2009 |
Ananthapadmanabhan Arasanipalai Kandhadai, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20080288245 | TANDEM-FREE INTERSYSTEM VOICE COMMUNICATION - Techniques are presented herein to provide tandem-free operation between two wireless terminals through two otherwise incompatible wireless networks. Specifically, embodiments provide tandem-free operation between a wireless terminal communicating through a continuous transmission (CTX) wireless channel to a wireless terminal communicating through a discontinuous transmission (DTX) wireless channel. In a first aspect, inactive speech frames are translated between DTX and CTX formats. In a second aspect, each wireless terminal includes an active speech decoder that is compatible with the active speech encoder on the opposite end of the mobile-to-mobile connection. | 11-20-2008 |
| 20090281799 | TANDEM-FREE VOCODER OPERATIONS BETWEEN NON-COMPATIBLE COMMUNICATION SYSTEMS - Tandem-free vocoder operations (TFO) between non-compatible communication systems may be enabled through hardware modifications at communication elements within each system. In one aspect, each infrastructure entity in System 1 comprises an intra-system TFO Frame Generator G | 11-12-2009 |
| 20100165922 | DISCONTINUOUS TRANSMISSION IN A WIRELESS NETWORK - A communication system for use in a wireless network includes: an audio module configured to provide packets indicative of audio for a part of a communication between the communication system and another communication system, the communication spanning packet times, the packets including at least critical packets indicative of critical audio; and a transceiver coupled to the audio module and configured to cause: the critical packets to be conveyed for transmission; and first non-critical packets, indicative of non-critical audio, to be conveyed for transmission such that (1) the first non-critical packets represent less than all of a time between transmission of critical packets and (2) no more than a threshold number of packet times will pass without one of the critical packets or one of the first non-critical packets being conveyed by the transceiver for transmission. | 07-01-2010 |
| 20110099004 | DETERMINING AN UPPERBAND SIGNAL FROM A NARROWBAND SIGNAL - A method for determining an upperband speech signal from a narrowband speech signal is disclosed. A list of narrowband line spectral frequencies (LSFs) is determined from the narrowband speech signal. A first pair of adjacent narrowband LSFs that have a lower difference between them than every other pair of adjacent narrowband LSFs in the list is determined. A first feature that is a mean of the first pair of adjacent narrowband LSFs is determined. Upperband LSFs are determined based on at least the first feature using codebook mapping. | 04-28-2011 |
Ananthapadmanbhan A. Kandhadai, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20110082693 | SYSTEMS, METHODS, AND APPARATUS FOR FRAME ERASURE RECOVERY - In one configuration, erasure of a significant frame of a sustained voiced segment is detected. An adaptive codebook gain value for the erased frame is calculated based on the preceding frame. If the calculated value is less than (alternatively, not greater than) a threshold value, a higher adaptive codebook gain value is used for the erased frame. The higher value may be derived from the calculated value or selected from among one or more predefined values. | 04-07-2011 |
Anathapadmanabhan A. Kandhadai, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20100312552 | SYSTEMS AND METHODS FOR PREVENTING THE LOSS OF INFORMATION WITHIN A SPEECH FRAME - A method for preventing the loss of information within a speech frame is described. A first speech frame to be encoded is selected. A determination is made as to whether or not a second speech frame is a critical speech frame based on the information within the second speech frame and one or more adjacent speech frames. At least a part of an encoded version of the second speech frame is created according to a selected forward error correction (FEC) mode if the second speech frame is a critical speech frame. The first speech frame and the at least a part of the encoded version of the second speech frame are transmitted. | 12-09-2010 |