Image and audio transform methods

a technology of image and audio, applied in the field of digital signal processing, can solve problems such as the computational complexity of the transform used

Inactive Publication Date: 2010-04-01
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a way to process digital signals in audio and video coding using a technique called DFT and odd-DFT to create type-III DCT. This can improve the quality and efficiency of the coding process.

Problems solved by technology

However, the computational complexity of the transforms used are a problem for low power devices.

Method used

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  • Image and audio transform methods
  • Image and audio transform methods
  • Image and audio transform methods

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Embodiment Construction

[0015]Preferred embodiment methods implement type-III discrete cosine transform (DCT) with a complex FFT of half the size; FIG. 1 is a flowchart. This has applications to video decoding (inverse DCT) and to modified discrete cosine, transform (MDCT) filter bank of the type used in audio coding such as MP3, AAC, and AAC plus SBR.

[0016]Preferred embodiment systems (such as audio / video coders, cell phones and digital cameras with video clip and audio coding capabilities, et cetera) perform preferred embodiment methods with any of several types of hardware: digital signal processors (DSPs), general purpose programmable processors, application specific circuits, or systems on a chip (SoC) which may have multiple processors such as combinations of DSPs. RISC processors, plus various specialized programmable accelerators; see FIG. 4a as a processor example. A stored program in an onboard or external (flash EEP) ROM or FRAM could implement the signal processing. Analog-to-digital converters...

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Abstract

Inverse discrete cosine transform (type-III DCT), used in video / image and audio coding, is implemented in the form of FFT to lower computational complexity.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 11 / 234,254 filed Sep. 23, 2005, which claims priority from U.S. Provisional Application No. 60 / 612,388, filed Sep. 23, 2004. The following coassigned pending patent applications disclose related subject matter: U.S. application Ser. No. 11 / 120,365 filed May 2, 2005 (TI-37321), now U.S. Pat. No. 7,512,536, granted Mar. 31, 2009 and U.S. application Ser. No. 09 / 23 / 2005 (TI-39011).BACKGROUND OF THE INVENTION[0002]The present invention relates to digital signal processing, and more particularly to transform processing in audio / visual coding. Processing of digital audio and video / image signals typically includes both transformation of the signals into frequency domains and reliance upon redundancies or psychoacoustic effects in order to reduce the number of bits used to encode the signals. Indeed, video coding standards such as MPEG-1, MPEG-2, MPEG-4, and 11.263 use the hybrid video...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G06F17/14G06F15/00G10L19/00
CPCG06F17/147H04N19/61H04N19/122
InventorMANSOUR, MOHAMED F.
OwnerTEXAS INSTR INC