Title :
A low-power, voice-controlled, H.263 video decoder for portable applications
Author :
Bolcioni, Luca ; Borgatti, Michele ; Felici, Marco ; Rambaldi, Robert ; Guerrieri, Roberto
Author_Institution :
Dipt. di Elettronica Inf. e Sistemistica, Bologna Univ., Italy
fDate :
11/1/1998 12:00:00 AM
Abstract :
In this paper, a low-power, low-voltage, voice-controlled H.263 video decoding system is presented. Its power consumption makes it suitable for portable systems with limited battery resources. Video decoding of quarter-common intermediate format (QCIF) images at 25 frames per second is achieved at 1-MHz clock frequency and requires about 60 μW at 1-V power supply, Sub-QCIF and CIF image formats are also supported. The decoder circuit is controlled by the on-chip isolated word speech recognizer. It is used to implement command-oriented and menu-based applications. The resulting system is expandable taking additional external devices under voice control. The chip integrates 650-k transistors in a 36-mm2 area and has been implemented using a standard CMOS 0.35-μm, five-metal technology process. The system works correctly down to 0.9 V, allowing single-cell button battery operation
Keywords :
CMOS digital integrated circuits; decoding; discrete cosine transforms; mobile communication; speech recognition; video signal processing; 0.35 micron; 0.9 V; 1 MHz; 1 V; 60 muW; CMOS; H.263 video decoder; command-oriented applications; menu-based applications; on-chip isolated word speech recognizer; portable applications; quarter-common intermediate format images; single-cell button battery operation; voice-controlled decoding system; Batteries; CMOS technology; Circuits; Clocks; Control systems; Decoding; Energy consumption; Frequency; Power supplies; Speech recognition;
Journal_Title :
Solid-State Circuits, IEEE Journal of
