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    63.
    发明专利
    未知

    公开(公告)号：DE69813912T2

    公开(公告)日：2004-05-06

    申请号：DE69813912

    申请日：1998-10-26

    Applicant: ST MICROELECTRONICS ASIA

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

    IPC: G10L19/02 ,  G10L19/14 ,  G10L19/16 ,  G06F19/00

    Abstract: AC-3 is a high quality audio compression format widely used in feature films and, more recently, on Digital Versatile Disks (DVD). For consumer applications the algorithm is usually coded into the firmware of a DSP Processor, which due to cost considerations may be capable of only fixed point arithmetic. It is generally assumed that 16-bit processing is incapable of delivering the high fidelity audio, expected from the AC-3 technology. Double precision computation can be utilized on such processors to provide the high quality; but the computational burden of such implementation will be beyond the capacity of the processor to enable real-time operation. Through extensive simulation study of a high quality AC-3 encoder implementation, a multi-precision technique for each processing block is presented whereby the quality of the encoder on a 16-bit processor matches the single precision 24-bit implementation very closely without excessive additional computational complexity.

    64.
    发明专利
    未知

    公开(公告)号：DE69816875T2

    公开(公告)日：2004-04-22

    申请号：DE69816875

    申请日：1998-05-30

    Applicant: ST MICROELECTRONICS ASIA

    Inventor： HUI WAI

    IPC: G06T9/00 ,  H04N7/26 ,  H04N7/46 ,  H04N7/50

    Abstract: A method and apparatus for encoding pictures of a moving pictures sequence according to an overall target bit-rate, such as in a MPEG video encoder. Each picture has an assigned picture coding type for which a quality factor is adaptively determined according to past bit usages, so that bits can be adaptively allocated amongst picture types for optimizing visual quality of the encoded pictures.

    66.
    发明专利
    未知

    公开(公告)号：DE69718345T2

    公开(公告)日：2003-12-24

    申请号：DE69718345

    申请日：1997-09-29

    Applicant: ST MICROELECTRONICS ASIA

    Inventor： DESPREZ-LE GOARANT YANN ,  CHUA KAH

    IPC: H04N9/68 ,  H04N9/77

    Abstract: PCT No. PCT/SG97/00047 Sec. 371 Date Aug. 13, 1999 Sec. 102(e) Date Aug. 13, 1999 PCT Filed Sep. 29, 1997 PCT Pub. No. WO98/20683 PCT Pub. Date May 14, 1998This invention relates to the color matching function used in connection with the luminance or white stretch function in a television video processor. Automatic adjustment in the amplitude of the color difference signals is provided to compensate for the effect of the stretch of the luminance signal in a provision called color matching. The general principal of color matching being, any percentage change in the amplitude of the luminance signal due to the white stretch effect, must be balanced by the same percentage changes in the color difference signal so that the ratio of the color signals can be maintained after matrixing. This accomplished by compensating the color difference signals by a varying amount that decreases with increasing the input luminance signal level when the level of the input luminance signal is above said selected threshold.

    69.
    发明专利
    未知

    公开(公告)号：DE69722973D1

    公开(公告)日：2003-07-24

    申请号：DE69722973

    申请日：1997-12-19

    Applicant: ST MICROELECTRONICS ASIA

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

    IPC: H04B1/66 ,  H04S1/00

    Abstract: A method and apparatus for subband phase flag determination for coupling of channels in a dual channel audio encoder is based on a psychoacoustic model of the human auditory system. The method and apparatus are applicable to audio encoders which utilize a coupling channel to combine certain frequency components of the input audio signals. The method ensures a least square error between the original channel frequency coefficients at the encoder and the estimated coefficients at the decoder by determining the sign of the dot product of the coefficients for one of the channels and the coupling coefficients. No restriction is placed on the strategy utilized for generating the coupling channel coefficients or the coupling coordinates.

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