Decoding video signals at high speed using a memory buffer

Details Decoding video signals at high speed using a memory buffer Decoding video signals at high speed using a memory buffer

1996-06-04

1998-10-06

Tung, Kee M.

Computer graphics processing and selective visual display system

Computer graphic processing system

Interface

345501, 345507, 711151, 348718, G06F 1316

Patent

active

058184686

ABSTRACT:
A method for decoding and displaying video signals using a memory buffer, in which a speed of a write operation for a memory buffer is adjusted to avoid overtaking a read operation for the same memory buffer. A display controller and a video MPEG engine contend for access to a DRAM memory buffer controller, and have their relative priorities set so that the video MPEG engine operates to write to the memory buffer at a relatively slow speed during a time period when the display controller is reading from that same memory buffer, and to write to the memory buffer at a relatively fast speed during a time period when the display controller is not reading from the memory buffer. The relatively slow speed is preferably much slower than the reading speed of the display controller, while the relatively fast speed is preferably much faster than the display controller. The DRAM memory buffer controller has a limited memory transfer bandwidth; the display controller and the video MPEG engine are operated at speeds which completely occupy that bandwidth, with the display controller given higher priority. Thus, while the display controller is reading from the memory buffer, the video MPEG engine is constrained to operate at a relatively slow speed, and is unable to overtake the display controller, but while the display controller is not reading from the memory buffer (e.g., during a vertical retrace interval), the video MPEG engine is able to operate at a relatively high speed, and is able to write an entire frame to the memory buffer in a relatively short time.

REFERENCES:
patent: 3846762 (1974-11-01), Gregory et al.
patent: 3908080 (1975-09-01), Broadbent
patent: 3947826 (1976-03-01), Bockwoldt
patent: 4181933 (1980-01-01), Benysek
patent: 4353057 (1982-10-01), Bernet et al.
patent: 4394650 (1983-07-01), Long et al.
patent: 4425581 (1984-01-01), Schweppe et al.
patent: 4498098 (1985-02-01), Stell
patent: 4523227 (1985-06-01), Hurst
patent: 4528561 (1985-07-01), Kitamura
patent: 4580165 (1986-04-01), Patton et al.
patent: 4587633 (1986-05-01), Wang et al.
patent: 4626837 (1986-12-01), Priestly
patent: 4628479 (1986-12-01), Borg et al.
patent: 4675612 (1987-06-01), Adams et al.
patent: 4680622 (1987-07-01), Barnes et al.
patent: 4684936 (1987-08-01), Brown et al.
patent: 4713621 (1987-12-01), Nakamura et al.
patent: 4757310 (1988-07-01), Katsura et al.
patent: 4779210 (1988-10-01), Katsura et al.
patent: 4811205 (1989-03-01), Normington et al.
patent: 4814879 (1989-03-01), McNeely
patent: 4862392 (1989-08-01), Steiner
patent: 4870406 (1989-09-01), Gupta et al.
patent: 4876600 (1989-10-01), Pietzsch et al.
patent: 4891631 (1990-01-01), Fredlund et al.
patent: 4905189 (1990-02-01), Brunolli
patent: 4907186 (1990-03-01), Truong
patent: 4916301 (1990-04-01), Mansfield et al.
patent: 4947257 (1990-08-01), Fernandez et al.
patent: 4947342 (1990-08-01), Katsura et al.
patent: 4951229 (1990-08-01), DiNicola et al.
patent: 4953101 (1990-08-01), Kelleher et al.
patent: 4994912 (1991-02-01), Lumelsky et al.
patent: 5027212 (1991-06-01), Marlton et al.
patent: 5046023 (1991-09-01), Katsura et al.
patent: 5065346 (1991-11-01), Kawai et al.
patent: 5097257 (1992-03-01), Clough et al.
patent: 5099331 (1992-03-01), Truong
patent: 5111292 (1992-05-01), Kuriacose et al.
patent: 5111409 (1992-05-01), Gasper et al.
patent: 5122875 (1992-06-01), Raychaudhuri et al.
patent: 5138307 (1992-08-01), Tatsumi
patent: 5151875 (1992-09-01), Sato
patent: 5157716 (1992-10-01), Naddor et al.
patent: 5168356 (1992-12-01), Acampora et al.
patent: 5185665 (1993-02-01), Okura et al.
patent: 5191410 (1993-03-01), McCalley et al.
patent: 5191548 (1993-03-01), Balkanski et al.
patent: 5196946 (1993-03-01), Balkanski et al.
patent: 5208745 (1993-05-01), Quentin et al.
patent: 5218431 (1993-06-01), Gleicher et al.
patent: 5220312 (1993-06-01), Lumelsky et al.
patent: 5231492 (1993-07-01), Dangi et al.
patent: 5243447 (1993-09-01), Bodenkamp et al.
patent: 5253078 (1993-10-01), Balkanski et al.
patent: 5270832 (1993-12-01), Balkanski et al.
patent: 5289276 (1994-02-01), Siracusa et al.
patent: 5309111 (1994-05-01), McNeely et al.
patent: 5309567 (1994-05-01), Mizukami
patent: 5329630 (1994-07-01), Baldwin
patent: 5333261 (1994-07-01), Guttag et al.
patent: 5341318 (1994-08-01), Balkanski et al.
patent: 5371861 (1994-12-01), Keener et al.
patent: 5379356 (1995-01-01), Purcell et al.
patent: 5392239 (1995-02-01), Margulis et al.
patent: 5397853 (1995-03-01), Koguchi
patent: 5402147 (1995-03-01), Chen et al.
patent: 5406306 (1995-04-01), Siann et al.
patent: 5416749 (1995-05-01), Lai
patent: 5426756 (1995-06-01), Shyi et al.
patent: 5434913 (1995-07-01), Tung et al.
patent: 5446501 (1995-08-01), Takemoto et al.
patent: 5450542 (1995-09-01), Lehman et al.
patent: 5450544 (1995-09-01), Dixon et al.
patent: 5471576 (1995-11-01), Yee
patent: 5611041 (1997-03-01), Bril et al.
patent: 5673416 (1997-09-01), Chee et al.
Brunhoff, Todd; "VEX Provides Mechanism for Integrating Graphics and Video"; Computer Technology Review; 10 Nov. 1990; No. 1, pp. 107-111.

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