ES8303863A1 - Table look-up of non-linear functions using reduced-sized rom. - Google Patents

Table look-up of non-linear functions using reduced-sized rom.

Info

Publication number
ES8303863A1
ES8303863A1 ES509037A ES509037A ES8303863A1 ES 8303863 A1 ES8303863 A1 ES 8303863A1 ES 509037 A ES509037 A ES 509037A ES 509037 A ES509037 A ES 509037A ES 8303863 A1 ES8303863 A1 ES 8303863A1
Authority
ES
Spain
Prior art keywords
memory
digital
digital signal
transfer characteristic
polarity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES509037A
Other languages
Spanish (es)
Other versions
ES509037A0 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/298,269 external-priority patent/US4434437A/en
Priority claimed from US06/319,090 external-priority patent/US4422094A/en
Application filed by RCA Corp filed Critical RCA Corp
Publication of ES509037A0 publication Critical patent/ES509037A0/en
Publication of ES8303863A1 publication Critical patent/ES8303863A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/0307—Logarithmic or exponential functions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G06F1/0353—Reduction of table size by using symmetrical properties of the function, e.g. using most significant bits for quadrant control
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G06F1/0356—Reduction of table size by using two or more smaller tables, e.g. addressed by parts of the argument
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformations in the plane of the image
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/395—Arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C8/00—Arrangements for selecting an address in a digital store
    • G11C8/04—Arrangements for selecting an address in a digital store using a sequential addressing device, e.g. shift register, counter
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C8/00—Arrangements for selecting an address in a digital store
    • G11C8/16—Multiple access memory array, e.g. addressing one storage element via at least two independent addressing line groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/04—Trigonometric functions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/08—Powers or roots
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/10—Logarithmic or exponential functions

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Image Processing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

A digital memory (10) which contains digital data words representative of a desired symmetrical transfer characteristic of a digital signal processor. Digital signals which are to be processed are applied to the address inputs of the memory (10), producing output signals in conformance with the desired transfer characteristic. Advantage is taken of the symmetrical nature of the response characteristic to minimize the size of the memory. Data words corresponding to only a portion of the full dynamic range of the digital signal processor are stored in the memory (10), and memory locations are addressed and read out in accordance with the value of a polarity-determining bit of the input digital signal, with the output signals being translated over the required full dynamic range in accordance with the value of the polarity-determining bit. In a preferred embodiment of the invention, the memory (10) is a random access memory, with stored data values being altered in response to a user control to change the transfer characteristic of the processor.
ES509037A 1981-01-26 1982-01-25 Table look-up of non-linear functions using reduced-sized rom. Expired ES8303863A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8102281 1981-01-26
US06/298,269 US4434437A (en) 1981-01-26 1981-08-31 Generating angular coordinate of raster scan of polar-coordinate addressed memory
US06/319,090 US4422094A (en) 1981-11-06 1981-11-06 Digital signal processor with symmetrical transfer characteristic

Publications (2)

Publication Number Publication Date
ES509037A0 ES509037A0 (en) 1983-02-01
ES8303863A1 true ES8303863A1 (en) 1983-02-01

Family

ID=27261102

Family Applications (1)

Application Number Title Priority Date Filing Date
ES509037A Expired ES8303863A1 (en) 1981-01-26 1982-01-25 Table look-up of non-linear functions using reduced-sized rom.

Country Status (5)

Country Link
EP (1) EP0070311A4 (en)
AU (1) AU8147882A (en)
ES (1) ES8303863A1 (en)
IT (1) IT8219282A0 (en)
WO (1) WO1982002637A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4750211A (en) * 1983-07-29 1988-06-07 Polaroid Corporation Method and apparatus for image processing with field portions
US4839721A (en) * 1984-08-28 1989-06-13 Polaroid Corporation Method of and apparatus for transforming color image data on the basis of an isotropic and uniform colorimetric space
JPS6195629A (en) * 1984-10-16 1986-05-14 Sony Corp Television receiver
US4710892A (en) * 1984-10-29 1987-12-01 Rca Corporation Phase calculation circuitry in digital television receiver
GB2181907B (en) * 1985-10-18 1989-10-11 Stc Plc Phase rotation of signals
FR2589265B1 (en) * 1985-10-28 1989-10-27 Descartes Paris V Universite R DIGITAL ECHOGRAPHIC IMAGE PROCESSOR, INTERPOLATING
US4931801A (en) * 1989-04-24 1990-06-05 Honeywell Inc. Method and apparatus to scan convert radar video to television outputs
US5051734A (en) * 1990-01-11 1991-09-24 The Grass Valley Group, Inc. Special effects using polar image coordinates
US5430497A (en) * 1990-08-06 1995-07-04 Samsung Electronics Co., Ltd. Removal of the folding carrier and sidebands from an unfolded video signal
US5677967A (en) * 1993-03-10 1997-10-14 R. R. Donnelley & Sons Company Method of and apparatus for converting between a color appearance space and a colorant space
US5625557A (en) * 1995-04-28 1997-04-29 General Motors Corporation Automotive controller memory allocation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL261376A (en) * 1960-02-19
US3836812A (en) * 1973-01-22 1974-09-17 Singer Co Display of digitally stored image on a spherical viewing surface
DE2421330C3 (en) * 1974-05-02 1978-03-30 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for the numerical determination of the functional value of a function with n parameters and application of the circuit arrangement
GB1510148A (en) * 1975-04-17 1978-05-10 Secr Defence Digital scan converters
JPS6024429B2 (en) * 1977-08-15 1985-06-12 沖電気工業株式会社 Digital scan conversion method
US4159527A (en) * 1978-01-19 1979-06-26 Tokyo Shibaura Electric Co., Ltd. Wave generator
US4275415A (en) * 1978-11-13 1981-06-23 Litton Industrial Products, Inc. Scan converter
US4241412A (en) * 1979-03-16 1980-12-23 Diasonics, Inc. Polar to cartesian mapping apparatus and method

Also Published As

Publication number Publication date
EP0070311A4 (en) 1985-06-06
WO1982002637A1 (en) 1982-08-05
EP0070311A1 (en) 1983-01-26
AU8147882A (en) 1982-08-16
IT8219282A0 (en) 1982-01-25
ES509037A0 (en) 1983-02-01

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