Abstract: This invention discloses a method of frequency band group partition for wideband audio codec. It can determine the initial frequency band group partition within the whole effective range of frequency bands. It further subdivides frequency band groups based on the initial partition. Instead of the iteration-based algorithm, this invention applies the 1-from-2 and 1-from-3 criterions to accomplish the fast partition with at most 3 subdivisions. This invention implements the fast partition for frequency band group without the loss of the coding efficiency. By applying this fast partition method, one can greatly reduce the computational complexity and significantly improve the coding performance.

Abstract: This invention discloses a method of bit-rate control and adjustment for audio coding, which comprises following steps: obtain the spectrum of the current audio frame and compute the maximum absolute value of each Bark (Bark: in the unit of critical band) frequency band; calculate the initial value of the minimum scale factor threshold and set the scale factor for each Bark band; Scale the spectrum of each audio frame with different scale factor, encode the quantized spectrum and calculate the coded bit of the current frame; Determine whether or not the coded bits of current frame is within the expected range of the bits, if yes, the bitstream is formatted and outputted, otherwise the minimum scale factor threshold is adjusted and repeat the above steps until the requirement is met. This method can significantly improve the encoding speed and reduce the coding loss of audio.

Abstract: This invention discloses an implementation of audio codec, which has low computational complexity, small memory footprint and high coding efficiency. It can be used in handheld devices, SoC or ASIC products and embedded systems. At the encoder side: first, apply time-to-frequency transform to audio signals, obtaining un-quantized spectrum data; second, based on the un-quantized spectrum data and target bit count, calculate the corresponding information of optimal scale factor, frequency band group, code table index and quantized spectrum by iteration; third, calculate and format bit-stream; fourth, output formatted bit-stream. At the decoder side: parse the formatted bit-stream, apply decoding and inverse quantization to the spectrum of each frame, reconstruct temporal audio data by frequency-to-time transform, and reconstruct the time-domain signals of each channel.

Abstract: A video input processor is provided to process different input video format, including RGB, RGB Bayer, YUV 4:2:2 interlaced and progressive video data. The video input processor also uses an advanced algorithm to efficiently convert video data in RGB color space to YUV color space. The video input processor further enables multi-functions such as video image scaling, video image filtering before the video data are output for further video compression.

Abstract: A video compression scheme enables the user to select one of many video compression formats, including the widely-used standard video formats such as MPEG-1, MPEG-2, MPEG-4 and H.263. In one embodiment, the scheme is implemented as a hardware-software combination, with the hardware portion, preferably implemented as an ASIC chip, performing the core compression and the software portion dealing with the detailed formatting. In another embodiment, a 32-bit aligned transitional data format is used.

Abstract: A video compression scheme enables the user to select one of many video compression formats, including the widely-used standard video formats such as MPEG-1, MPEG-2, MPEG-4 and H.263. In one embodiment, the scheme is implemented as a hardware-software combination, with the hardware portion, preferably implemented as an ASIC chip, performing the core compression and the software portion dealing with the detailed formatting. In another embodiment, a 32-bit aligned transitional data format is used.

Abstract: A method, apparatus, computer medium, and other embodiments for discrete cosine transform and inverse discrete cosine transform (DCT/IDCT) of image signals are described. A DCT/IDCT module includes a plurality of different cores. One embodiment of a core includes two sets of lookup tables to provide multiplication and add operations for the DCT and IDCT functions. Another embodiment of a core include one set of lookup tables, while another embodiment of a core includes no lookup table. The DCT/IDCT module provides forward DCT and IDCT functionality without the use of additional multipliers.

Abstract: A video input processor is provided to process different input video format, including RGB, RGB Bayer, YUV 4:2:2 interlaced and progressive video data. The video input processor also uses an advanced algorithm to efficiently convert video data in RGB color space to YUV color space. The video input processor further enables multi-functions such as video image scaling, video image filtering before the video data are output for further video compression.