公开(公告)号：DE602007001625D1

公开(公告)日：2009-09-03

申请号：DE602007001625

申请日：2007-04-27

Applicant: ST MICROELECTRONICS ASIA

Inventor： KURNIAWATI EVELYN ,  GEORGE SAPNA

IPC: G10L19/02 ,  G10L19/035

Abstract: The present invention discloses a process for encoding an audio data, an audio encoder for compressing uncompressed audio data, and an electronic device that is capable of encoding audio data in low power consumption. The electronic devices include audio player/recorder, PDA, pocket organizer, camera with audio recording capacity, computers, and mobile phones.

公开(公告)号：DE69840238D1

公开(公告)日：2009-01-02

申请号：DE69840238

申请日：1998-02-12

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR MOHAMMED JAVED ,  GEORGE SAPNA ,  ALVAREZ-TINOCO ANTONIO MARIO

IPC: H04B1/66 ,  G10L25/30

Abstract: A method and apparatus for assigning an exponent coding strategy in a digital audio transform coder. Different coding strategies having different differential coding limits may be assigned to different set of transform exponents according to the frequency domain characteristics of the audio signal. A neural network processing system is utilised to perform an efficient mapping of each exponent set to an appropriate coding strategy.

公开(公告)号：DE602005008872D1

公开(公告)日：2008-09-25

申请号：DE602005008872

申请日：2005-11-08

Applicant: ST MICROELECTRONICS ASIA

Inventor： PADHI KABI P ,  KUMAR SUDHIR K ,  GEORGE SAPNA

IPC: G10L19/00

Abstract: A method includes receiving a sequence of frames containing audio information and determining that a frame is missing in the sequence of frames. The method also includes comparing the frame that precedes the missing frame to the received frames to identify a selected frame. The method further includes identifying a replacement frame comprising the frame that follows the selected frame. In addition, the method includes inserting the replacement frame into the sequence of frames in place of the missing frame.

公开(公告)号：DE69932861D1

公开(公告)日：2006-09-28

申请号：DE69932861

申请日：1999-10-30

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR MOHAMMED JAVED ,  GEORGE SAPNA

IPC: G10L19/002 ,  G10L19/02 ,  G10L19/035

Abstract: A method for encoding an audio signal, including providing a masking function, representative of psychoacoustic masking; setting a quality value for data of the encoded signal, adjusting the masking function dependent upon the quality value; and allocating bits for quantization of the encoded signal based on the incremental masking function.

公开(公告)号：DE69808146D1

公开(公告)日：2002-10-24

申请号：DE69808146

申请日：1998-01-12

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR JAVED ,  GEORGE SAPNA ,  ALVAREZ-TINOCO MARIO

IPC: H03M7/00 ,  H04B1/66

Abstract: A method and apparatus for coding audio data in a frequency transform digital audio coder employing differential frequency coefficient exponent coding. Differential coding of exponents places constraints on possible values an exponent can take, which can lead to distortion in the decoded and reconstructed audio signal. The method and apparatus herein can overcome this restriction by mapping the input exponent set to a new set of values which satisfy the differential constraint as well as reducing information loss, thereby minimizing overall signal distortion due to coding restrictions.

公开(公告)号：SG144133A1

公开(公告)日：2008-07-29

申请号：SG2008001075

申请日：2008-01-02

Applicant: ST MICROELECTRONICS ASIA

Inventor： KURNIAWATI EVELYN ,  GEORGE SAPNA

Abstract: LOW POWER DOWNMIX ENERGY EQUALIZATION IN PARAMETRIC STEREO ENCODERS A method and audio device are presented that preserve mono energy during downmixing of a hybrid coding process of an audio signal. The method includes calculating a stereo scaling factor in a group level that is definable within a stereo band. The method may also include updating the stereo scaling factor using an update rate and synchronizing the update rate of a spatial parameter during a fast changing transient portion of the signal. A number of groups in a first stereo band may be greater than a number of groups in a second stereo band, and the first stereo band may be a lower frequency band than the second band or may be perceptually more important than the second band.

公开(公告)号：DE69932861T2

公开(公告)日：2007-03-15

申请号：DE69932861

申请日：1999-10-30

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR MOHAMMED JAVED ,  GEORGE SAPNA

IPC: G10L19/002 ,  G10L19/02 ,  G10L19/035

Abstract: A method for encoding an audio signal, including providing a masking function, representative of psychoacoustic masking; setting a quality value for data of the encoded signal, adjusting the masking function dependent upon the quality value; and allocating bits for quantization of the encoded signal based on the incremental masking function.

公开(公告)号：DE69928842T2

公开(公告)日：2006-08-17

申请号：DE69928842

申请日：1999-10-30

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR JAVED ,  GEORGE SAPNA

IPC: H04B1/66 ,  G10L19/008 ,  G10L19/16

Abstract: Channel coupling for an AC-3 encoder, using mixed precision computations and 16-bit coupling coefficient calculations for channels with 32-bit frequency coefficients.

公开(公告)号：DE60118800D1

公开(公告)日：2006-05-24

申请号：DE60118800

申请日：2001-06-08

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR MOHAMMED JAVED ,  GEORGE SAPNA

IPC: G10L19/02

Abstract: A unified filter bank for use in encoding and decoding MPEG-1 audio data, wherein input audio data is encoded into coded audio data and the coded audio data is subsequently decoded into output audio data. The unified filter bank includes a plurality of filters, with each filter of the plurality of filters being a cosine modulation of a prototype filter. The unified filter bank is operational as an analysis filter bank during audio data encoding and as a synthesis filter bank during audio data decoding, wherein the unified filter bank is effective to substantially eliminate the effects of aliasing, phase distortion and amplitude distortion in the output audio data.

公开(公告)号：SG118180A1

公开(公告)日：2006-01-27

申请号：SG200301441

申请日：2003-03-07

Applicant: ST MICROELECTRONICS ASIA

Inventor： HUA JIAN SUN ,  GEORGE SAPNA

IPC: G10L19/00 ,  G11B20/10 ,  G11B20/12 ,  H04N5/926

Abstract: A method is disclosed of decoding audio data, encoded in multiple DIF blocks in a Digital Video (DV) data stream, and outputting said audio data as a PCM frame, including the following steps: (i) fetching a single Digital Interface Frame (DIF) block from the DV data stream; (ii) de-shuffling a first byte in the single DIF block to determine its index (n) in the PCM frame; (iii) repeating step (ii) until the last byte in the single DIF block is processed; (iv) writing the de-shuffled data into the PCM frame for output if the present DIF block is the last in the present DV frame; (v) repeat steps (i) to (iv). Also disclosed is apparatus arranged to perform the method, and de-shuffling equations to perform the de-shuffling of the data.