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    3.
    发明专利
    未知

    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.

    4.
    发明专利
    未知

    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.

    5.
    发明专利
    未知

    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.

    6.
    发明专利
    未知

    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.

    7.
    发明专利
    未知

    公开(公告)号：DE60118800T2

    公开(公告)日：2007-04-26

    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.

    9.
    发明专利
    未知

    公开(公告)号：DE69826529T2

    公开(公告)日：2005-09-22

    申请号：DE69826529

    申请日：1998-04-15

    Applicant: ST MICROELECTRONICS ASIA

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

    IPC: G10L19/002 ,  G10L19/00

    Abstract: In a transform encoder for audio data, encoded data in the form of mantissas, exponents and coupling data is packed into fixed length frames in an output bitstream. The fields within the frame for carrying the different forms of data are variable in length, and apace within the frame must be allocated between them to fit all of the required information into the frame. The space required by the various data types depends on certain encoding parameters, which are calculated for a particular frame before the data is encoded, thus ensuring that the encoded data will fit into the frame before the computationally expensive encoding process is carried out. Information in relation to, for example, transform length, coupling parameters and exponent strategy are determined, which allows the space required for the coupling and exponent data to be calculated. The mantissa encoding parameters can then be iteratively determined so that the encoded mantissas will fit into the frame with the other encoded data. The determined encoding parameters are stored and the audio data is encoded according to those parameters after it has been determined that the encoded data will fit into the frame.

    10.
    发明专利
    未知

    公开(公告)号：DE69826529D1

    公开(公告)日：2004-10-28

    申请号：DE69826529

    申请日：1998-04-15

    Applicant: ST MICROELECTRONICS ASIA

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

    IPC: G10L19/002 ,  G10L19/00

    Abstract: In a transform encoder for audio data, encoded data in the form of mantissas, exponents and coupling data is packed into fixed length frames in an output bitstream. The fields within the frame for carrying the different forms of data are variable in length, and apace within the frame must be allocated between them to fit all of the required information into the frame. The space required by the various data types depends on certain encoding parameters, which are calculated for a particular frame before the data is encoded, thus ensuring that the encoded data will fit into the frame before the computationally expensive encoding process is carried out. Information in relation to, for example, transform length, coupling parameters and exponent strategy are determined, which allows the space required for the coupling and exponent data to be calculated. The mantissa encoding parameters can then be iteratively determined so that the encoded mantissas will fit into the frame with the other encoded data. The determined encoding parameters are stored and the audio data is encoded according to those parameters after it has been determined that the encoded data will fit into the frame.

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