Raghunath Krishna Rao, 571128 Almeria Bnd, Leander, TX 78641

6349285, Feb 19, 2002

Jun 28, 1999

09/340619

Pu Liu - Austin TX
Raghunath Rao - Austin TX
Miroslav Dokic - Austin TX

Cirrus Logic, Inc.

G10L 2100

704500, 704504

A method of managing multiple channels of audio data in an audio system having multiple speakers. A first channel signal is selectively passed through a software high-pass filter to selectively drive a first one of the speakers. A plurality of channel signals are selectively summed in software to generate a composite signal and the composite signal passed through a software low-pass filter to selectively drive a second one of the speakers.

6356871, Mar 12, 2002

Jun 14, 1999

09/332804

Nariankadu Datatreya Hemkumar - Austin TX
Miroslav Dokic - Austin TX
Raghunath Krishna Rao - Austin TX

Cirrus Logic, Inc.

G10L 1900

704500, 375355

A method for synchronizing stream processing with a locally generated system time clock is disclosed. A program clock reference is recovered from a transport layer and used to vary the frequency of the locally generated system time clock. A presentation time stamp is recovered from a packetized elementary stream derived from the transport layer. The relationship between a reference sample associated with the presentation time stamp from the packetized elementary stream and a current sample being streamed is determined relative to the system time clock. Data samples are added or subtracted from a stream of data samples being streamed in response to the step of determining to establish a relationship between the stream of samples and the presentation time stamp relative to the system time clock.

6385704, May 7, 2002

Nov 14, 1997

08/969884

Raghunath Rao - Austin TX
Miroslav Dokic - Austin TX
Zheng Luo - Austin TX
Jeffrey Niehaus - Austin TX
James Divine - Austin TX

Cirrus Logic, Inc.

G06F 1200

711151, 711152

A method of operating shared memory in a multiple processor system. A token is by default maintained with a first processor, the token enabling access to shared memory. A determination is made that a second processor requires access to shared memory. A determination is also made as to whether the first processor is accessing to the shared memory. The token is transferred the second processor if the first processor is not accessing the shared memory. The second processor accesses the shared memory with the token.

6504496, Jan 7, 2003

Apr 10, 2001

09/832290

Vladimir Mesarovic - Austin TX
Raghunath Krishna Rao - Austin TX
Miroslav Dokic - Austin TX
Sachin Sunil Deo - Austin TX
Nariankadu Datareya Hemkumar - Rochester MN

Cirrus Logic, Inc. - Austin TX

H03M 700

341106, 341 51

A method of decoding an encoded bitstream. The method includes performing a two-table lookup. A first table is addressed in response to a first plurality of bits from the bitstream. An address into a second table is generated using a value in an entry in said first table accessed in the addressing step. A value (representing the decoded value corresponding to the codeword in the bitstream) in an entry in said second table at the address from the generating step is output.

6665409, Dec 16, 2003

Apr 7, 1999

09/287713

Raghunath K. Rao - Austin TX

Cirrus Logic, Inc. - Austin TX

H04R 2500

381 63, 381 61, 381307, 84630

A method of producing reverberation effects is disclosed. A filter is implemented for modeling early acoustic reflections in response to an input signal using a first processor, the filter includes a delay buffer of a selected length and having a selected number of taps for tapping samples of corresponding amounts of delay and a summer for summing the tapped samples to generate a filter output signal. A reverberator is implemented for modeling late acoustic reflections using a second processor, the reverberator receiving the filter output and generating a plurality of output signals.

6804655, Oct 12, 2004

Feb 6, 2001

09/778229

Miroslav Dokic - Austin TX
Sanjay Joshi - Austin TX
Vladimir Mesarovic - Austin TX
Raghunath Rao - Austin TX

Cirrus Logic, Inc. - Austin TX

G01L 1900

704500, 370350

A method for transferring data bursts via a synchronous data link includes the step of receiving a burst of packets, each packet including a header and a frame of data compressed at a selected sampling rate and transmitted at a selected bit rate. At least one of the packets of the stream of packets is embedded into a carrier frame including a carrier frame header. The carrier frame is then transmitted via the synchronous link. The data frame is extracted from the carrier frame and decompressed at the sample rate.

6898470, May 24, 2005

Nov 7, 2000

09/707875

Raghunath Rao - Austin TX, US
Narsimham Gangishetti - Austin TX, US
Miroslav Dokic - Austin TX, US

Cirrus Logic, Inc. - Austin TX

G06F017/00
H03G005/00

700 94, 381 98

Digital tone controls include a first path including a digital filter and a scaler for controlling a level of a low frequency component of a received digital audio signal. A second includes a digital filter and a scaler for controlling a level of a high frequency component of the received digital audio signal. A third path includes a scaler for controlling a level of an unfiltered component of the received audio signal. A summer adds a contribution from each of the paths to generate a composite signal having a selected gain-frequency response.

6948098, Sep 20, 2005

Mar 30, 2001

09/822052

Sanjay Ramakrishna Pillay - Austin TX, US
Raghunath Krishna Rao - Austin TX, US

Cirrus Logic, Inc. - Austin TX

G06F011/00

714 34, 714 30, 714 47

A debugging subsystem for testing a system-on-a-chip includes an embedded processor and memory and includes at least one debugging subblock monitors a bus between the processor and the memory to detect selected triggering events, counts the number of triggering events detected and when the number of triggering events reaches a predetermined threshold, generates a debugging signal.