公开(公告)号：DE69926019D1

公开(公告)日：2005-08-04

申请号：DE69926019

申请日：1999-09-30

Applicant: ST MICROELECTRONICS ASIA

Inventor： TIAN WENSHUN

IPC: G10L19/12

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.

公开(公告)号：DE69909849T2

公开(公告)日：2004-05-27

申请号：DE69909849

申请日：1999-11-24

Applicant: ST MICROELECTRONICS ASIA

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

IPC: G10H1/12 ,  G10H7/12

Abstract: A method for effecting aliasing cancellation in an audio effects algorithm using a delay modulated signal, derived from interpolation of a delay modulator at an instantaneous sampling frequency, including: determining the instantaneous sampling frequency 1/T isf and band limiting an input signal, to which the audio effects algorithm is to be applied to ½ T isf prior to interpolation.

公开(公告)号：DE69722973T2

公开(公告)日：2004-05-19

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.

公开(公告)号：DE69908433T2

公开(公告)日：2004-04-08

申请号：DE69908433

申请日：1999-10-30

Applicant: ST MICROELECTRONICS ASIA

Inventor： ABSAR MOHAMMED JAVED ,  GEORGE SAPNA

IPC: G10L19/16 ,  G10L19/14 ,  H04B1/66

公开(公告)号：DE69813632T2

公开(公告)日：2004-01-29

申请号：DE69813632

申请日：1998-05-12

Applicant: ST MICROELECTRONICS ASIA

Inventor： HUI WAI

IPC: H04N7/50

Abstract: This method and apparatus described herein imposes masking factors to the determined quantization step sizes of macroblocks of a video sequence such that encoding efficiency is increased. A conditional masking method can be used to take advantage of the fact that P-pictures are more important than B-pictures in terms of motion and scene updates as coding noise in such updates are likely propagated by P-pictures. The masking can be applied conditionally to motion/scene update regions of a picture such that coding noise is reduced and therefore bits are saved from less propagation of this noise. Before encoding each macroblock of a picture from an input video sequence, a video encoder with conditional masking determines if the macroblock type belongs to a significant motion or scene update region. A conditional masking factor is then determined for the macroblock based on the determined macroblock type and the picture coding type.The conditional masking factor is combined with a macroblock reference quantization step-size which may be calculated using conventional methods based on bit allocation and bit utilization, and an optional activity masking factor based on activity level of the macroblock and/or its surrounding region to form the final quantization step-size for coding of the macroblock.

公开(公告)号：DE69820309D1

公开(公告)日：2004-01-15

申请号：DE69820309

申请日：1998-09-25

Applicant: ST MICROELECTRONICS ASIA ,  ST MICROELECTRONICS SA

Inventor： DESPREZ-LE GOARANT YANN ,  JAFFARD JEAN-LUC ,  MICHON CHRISTIAN

IPC: H04N9/64 ,  H04N9/72

公开(公告)号：DE69816875D1

公开(公告)日：2003-09-04

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.

公开(公告)号：DE69909849D1

公开(公告)日：2003-08-28

申请号：DE69909849

申请日：1999-11-24

Applicant: ST MICROELECTRONICS ASIA

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

IPC: G10H1/12 ,  G10H7/12

Abstract: A method for effecting aliasing cancellation in an audio effects algorithm using a delay modulated signal, derived from interpolation of a delay modulator at an instantaneous sampling frequency, including: determining the instantaneous sampling frequency 1/T isf and band limiting an input signal, to which the audio effects algorithm is to be applied to ½ T isf prior to interpolation.

公开(公告)号：DE69722670D1

公开(公告)日：2003-07-10

申请号：DE69722670

申请日：1997-07-21

Applicant: ST MICROELECTRONICS ASIA

Inventor： ZHOU DONGLIN ,  DESPREZ-LE GOARANT YANN

IPC: H04N3/20

Abstract: An x-ray protection circuit for a video processor, to disable a horizontal output pulse when a voltage level on the x-ray input exceeds a reference voltage. The x-ray protection circuit comprises a comparator and a bistable device, and incorporates a reset circuit. The reset circuit enables the initialisation of the protection circuit whilst the power is switched on.