GB2332584A - Electronic programme guide with configurable ranges - Google Patents

Electronic programme guide with configurable ranges Download PDF

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Publication number
GB2332584A
GB2332584A GB9822136A GB9822136A GB2332584A GB 2332584 A GB2332584 A GB 2332584A GB 9822136 A GB9822136 A GB 9822136A GB 9822136 A GB9822136 A GB 9822136A GB 2332584 A GB2332584 A GB 2332584A
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United Kingdom
Prior art keywords
program schedule
picture
program
channels
information
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.)
Withdrawn
Application number
GB9822136A
Other versions
GB9822136D0 (en
Inventor
Seung-Hoon Hong
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.)
WiniaDaewoo Co Ltd
Original Assignee
Daewoo Electronics Co Ltd
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
Application filed by Daewoo Electronics Co Ltd filed Critical Daewoo Electronics Co Ltd
Publication of GB9822136D0 publication Critical patent/GB9822136D0/en
Publication of GB2332584A publication Critical patent/GB2332584A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H04N21/4314—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for fitting data in a restricted space on the screen, e.g. EPG data in a rectangular grid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/482—End-user interface for program selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration
    • H04N21/4858—End-user interface for client configuration for modifying screen layout parameters, e.g. fonts, size of the windows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A program schedule display method for use in a satellite broadcast signal receiver receives a satellite broadcast signal from a satellite. Program schedule information is extracted from the satellite broadcast signal and stored. If a user requests to be provided with a program schedule request, contents of a program schedule for each of a preset number of the channels for a predetermined time interval is displayed in one program schedule picture, based on the stored program schedule information. If the user requests to be provided with a modified program schedule, contents of a program schedule for each of the selected number of the channels for the chosen time interval in one program schedule picture is displayed, based on the updated program schedule information.

Description

2332584 PROGRAM SCHEDULE DISPLAY METHOD FOR USE IN A SATELLITE BROADCAST
SIGNAL RECEIVER The present invention relates to a satellite broadcast signal receiver; and, more particularly, to an interactive program schedule display method for use in a satellite broadcast signal receiver.
Recently, a new broadcasting system, utilizing a communication satellite and digitized broadcast signals, has been rapidly gaining worldwide popularity. The satellite broadcasting system, which can provide broadcast signals to is a wider area, employs super-high RF(radio frequency) signals ranging, e.g., from 11.7 GHz to 12.2 GHz, for carrying the digitized broadcast signals. To receive the super-high RF signals, a satellite broadcast signal receiver is normally equipped with a low noise blockdown converter for converting the super-high RF signals into RF signals of, e.g., 950 to 2050 MHz.
Thereafter, a tuner provided in the satellite broadcast signal receiver is tuned to a channel chosen by a user using the converted RF signals. A satellite broadcast signal received therethrough is processed by a demodulation and a decoding circuits in the receiver to thereby become a decoded - 1 broadcast signal. The decoded broadcast signal comprises various kinds of information such as video and audio data for a program being broadcast through the tuned channel and program schedule information representing program schedules for some or all of he channels serviced by the satellite broadcasting system.
The program schedule information is stored in a memory of the receiver; and can be retrieved to obtain a program schedule picture displayed on a monitor upon the request of the user so that the program schedule can be monitored by the user. The program schedule picture can be utilized for the user to merely view the program schedules of channels or to select a channel.
Such a satellite broadcast signal receiver has a number of advantages, e. g., maximization of channel utilization, quality improvement of a video and an audio signals and convenience of data transmission for additional digital services, the most remarkable advantage being in the improvement of user interfacing.
Fig. 1 provides an exemplary program schedule picture provided by a conventional satellite broadcast signal receiver. The program schedule information is retrieved from the memory and the program schedule picture is constructed when the user applies a corresponding command, wherein program schedules for a preset time interval, e.g., 2 hours, of a predetermined number of, e.g., 4, channels are displayed in the program schedule picture at one time. The user can view program schedules for other times or of other channels by scrolling the picture in a horizontal or a vertical direction.
Specifically, in Fig. 1, the program schedules for 4 channels, i.e., CHI to CH4, are displayed for a span of 2 hours, i.e., from 9 o'clock to 11 o'clock. In case the user wants to know, for instance, the program schedules of channel 6(CH6) from 8 o'clock to 13 o'clock, he may have to scroll down the program schedule picture until the CH6 is displayed. Thereafter, the user would scroll the program schedule picture left until the program schedule at 8 o'clock appears; and further scroll the program schedule picture left until there appears the program schedule at 13 o'clock.
Since the range of the program schedules to be displayed in a program schedule picture is fixed in the conventional program schedule display method described above, the user has to scroll the program schedule picture in various directions in order to find the program schedule of a desired channel and time. Accordingly, it is desirable to develop a more efficient and convenient program schedule display method, capable of interacting with the user.
It is, therefore, a primary object of the present invention to provide an interactive program schedule display method for use in a satellite broadcast signal receiver.
3 In accordance with the present invention, there is provided a program schedule display method for use in a satellite broadcast signal receiver, comprising the steps of: (a) receiving a satellite broadcast signal from a satellite; (b) extracting program schedule information from the received satellite broadcast signal and storing the extracted program schedule information; (c) displaying a program schedule picture of a default range based on the stored program schedule information upon a user's requests; (d) displaying a range modification picture if the user requests to modify the range of program schedule picture displayed in one program schedule picture; and (e) displaying the program schedule picture of the modified range based on the program schedule information if the user inputs the range of the program schedule picture to be modified.
The above and other objects and features of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
Fig. 1 shows a conventional program schedule picture; Fig. 2 illustrates an exemplary satellite broadcast signal receiver; Fig. 3A depicts an exemplary range modification picture; Fig. 3B represents a program schedule picture of a 4 modified range; and Figs. 4A and 4B provide a f low chart of a program schedule display procedure.
is Referring to Fig. 2, there is illustrated a satellite broadcasting signal receiver 100 applicable to the preferred embodiment of the present invention, wherein the satellite broadcasting signal receiver 100 comprises a tuner 110, a demodulator 120, an MPEG (motion picture expert group) decoding block 130, a microprocessor 140, a key matrix 150, a memory block 160, an OSD(on screen display) generation block 170, a mixing block 180 and an NTSC/PAL encoder 190.
The key matrix 150, e.g., in the form of a remote controller is used for generating request or command signals corresponding to user's commands, wherein the user's commands are issued by pressing keys of the key matrix 150. The generated request or command signals are provided to the microprocessor 140. The microprocessor 140 performs overall controls and, based on the request or command signals from the key matrix 150, generates various kinds of control signals.
Specifically, when a user's command for selecting a channel is inputted to the key matrix 150 by pressing a corresponding key of the key matrix 150, the key matrix 150 provides the microprocessor 140 with a channel selection signal corresponding thereto. Then, the microprocessor 140 generates a tuning control signal corresponding to the channel selection signal and provides it to the tuner 110.
The tuner 110 is provided with satellite broadcast signals from a satellite(not shown) and the tuning control signal from the microprocessor 140. The tuner 110 is tuned to a selected channel corresponding to the tuning control signal and receives a satellite broadcast signal carried by the selected channel, wherein the satellite broadcast signal corresponding to the selected channel is referred to as a selected channel signal hereinafter. The tuner 110 provides the selected channel signal to the demodulator 120.
The demodulator 120 demodulates the selected channel signal to provide a demodulated channel signal including an encoded bit stream of video and audio program data for a program being provided through the selected channel and program schedule information for the channels served by the satellite broadcast system. The demodulated channel signal is applied to the MPEG decoding block 130.
The MPEG decoding block 130 decodes the demodulated channel signal by using conventional decoding schemes, e.g., a variable length decoding scheme, an inverse DCT(discrete cosine transform) scheme, an inverse quantization scheme and a motion compensation scheme, to generate a decoded bit stream. In the decoded bit stream, decoded program information of the selected channel and decoded program schedule information for the all channels are included. The 6 is MPEG decoding block 130 provides the decoded program information to the mixing block 180 and the decoded program schedule information to the memory block 160.
The mixing block 180 receives the decoded program information from the MPEG decoding block 130 and a bit stream from the OSD generation block 170 and mixes them to generate a mixed bit stream. The bit stream from the OSD generation block 170 corresponds to one of menu pictures stored therein, wherein a menu picture can be one of program schedule picture of various ranges or a range modification picture and bit streams corresponding to the menu pictures are stored in the 0SD generation block 170.
The mixed bit stream is provided to the NTSC/PAI, encoder 190. The NTSC/PAL encoder 190 converts the mixed bit stream into an NTSC or a PAL analog video signal to provide the analog video signal to a display unit (not shown) As a result, the program corresponding to the decoded program information is progressed on the background of the display unit and the menu picture is overlapped with the program. An exemplary menu picture displayed on the display unit is shown in Fig. 1 wherein the menu picture corresponds the program schedule picture of a default range.
Meanwhile, when a user's command for displaying the program schedule picture of the default range is applied to the key matrix 150 by pressing a corresponding key of the key matrix 150, the key matrix 150 generates a program schedule - 7 is display request signal to provide same to the microprocessor 140. The microprocessor 140, based on the program schedule display request signal from the key matrix 150, provides a bit stream extraction signal to the memory block 160 and an OSD control signal to the OSD generation block 170, wherein the OSD control signal instructs the OSD generation block 170 to construct the program schedule picture of the default range.
The memory block 160, based on the bit stream extraction signal from the microprocessor 140, extracts a bit stream corresponding to the decoded program schedule information stored therein and provides same to the OSD generation block 170.
The OSD generation block 170 retrieves a bit stream corresponding to the frame of the menu picture indicated by the OSD control signal and constructs the frame of the menu picture, i.e., the program schedule picture of the default range. Then, the OSD generation block 170 fills the frame of the program schedule picture of the default range with the program schedule by using the bit stream corresponding to the decoded program schedule information from the memory block 160 to complete the program schedule picture of the default range. A bit stream corresponding to the program schedule picture of the default range is applied from the OSD generation block 170 to the mixing block 180.
In the meantime, when the user wants to modify the range of the program schedule picture displayed in one picture, the 8 user inputs a command for modifying the range of the program schedule picture to the key matrix 150 by pressing a corresponding key of the key matrix 150. Then, the key matrix 150 generates a range modification request signal corresponding thereto to provide same to the microprocessor 140.
The microprocessor 140, based on the range modification request signal, provides the OSD control signal to the OSD generation block 170. The OSD generation block 170, based on the OSD control signal from the microprocessor 140, obtains a bit stream corresponding to the range modification picture to construct the range modification picture. An exemplary range modification picture in accordance with the preferred embodiment of the present invention is depicted in Fig. 3A, wherein the exemplary range modification picture has two functions, i.e., selecting the number of channels and selecting a time interval displayed in a program schedule picture of a modified range at the same time. A bit stream corresponding to the range modification picture is applied to the mixing block 180 from the OSD generation block 170.
If the user selects N hours of the time interval and M number of channels based on the range modification picture, with N and M being positive integers, respectively, the key matrix 150 generates a modified range program schedule display signal corresponding thereto to provide same to the microprocessor 140.
The microprocessor 140, based on the modified range program schedule display request signal from the key matrix 150, provides the bit stream extraction signal to the memory b,lock 160 and the OSD control signal to the OSD generation block 170, wherein the OSD control signal instructs the OSD generation block 170 to construct the program schedule picture of the modified range.
The memory block 160, based on the bit stream extraction signal from the microprocessor 140, extracts the bit stream corresponding to the decoded program schedule information stored therein and provides same to the OSD generation block 170.
The OSD generation block 170 retrieves a bit stream corresponding to the frame of the menu picture indicated by is the OSD control signal and constructs the frame of the menu picture, i. e., the program schedule picture of the modified range. Then, the OSD generation block 170 fills the frame of the program schedule picture of the modified range with the program schedule by using the bit stream corresponding to the decoded program schedule information from the memory block 160. A bit stream corresponding to the program schedule picture of the modified range is applied to the mixing block 180 from the OSD generation block 170. An exemplary program schedule picture of the modified range in accordance with the preferred embodiment of the present invention is shown in Fig. 3B for the case when N is S and M is 6.
- 10 Meanwhile, if the user inputs a command to stop displaying the program schedule picture of the default or the modified range to the key matrix 150 by pressing a corresponding key of the key matrix 150 or a predetermined time elapses without any key input, the key matrix 150 generates a display end request signal to provide same to the microprocessor 140. The microprocessor 140, based on the display end request signal, provides a display end control signal to the OSD generation block 170.
The OSD generation block 170, based on the display end control signal, stops providing the bit stream corresponding to the program schedule picture of the default or the modified range. Then, the mixing block 180 receives and provides only the decoded program information to the NTSC/PAL encoder 190.
The NTSC/PAL encoder 190 converts the decoded program information for the selected channel into an NTSC or a PAL analog video signal to provide the analog video signal to the display unit. As a result, only the program for the selected channel is progressed on the background without being overlapped with the program schedule picture of the default or the modified range.
With reference to Figs. 4A and 4B, the program schedule display method for use in the satellite broadcast signal receiver in accordance with the present invention is illustrated step by step.
At step S41, an ordinary operation of the satellite 11 broadcasting signal receiver is executed. At step S42, it is checked if a program schedule display request signal is inputted. If the checked result is negative, the procedure goes back to step S41, wherein the ordinary operation continues; and if otherwise, the procedure goes to step S43, wherein a program schedule picture of a default range is displayed.
At step S44, it is examined if a range modification request signal is inputted. If the examined result is affirmative, the procedure goes to step S45, wherein a range modification picture is displayed; if otherwise, the procedure goes to step S49.
At step S46, it is tested if a range to be modified, i.e., the number of channels and a time intervalto be is displayed in one program schedule picture, is applied. If the test result is affirmative, the procedure goes to step S47; and if otherwise, the procedure goes to step S48. At step S47, a program schedule picture of a modified range is displayed based on the range applied at step S46.
At step S48, it is detected if a display end request signal is applied or a predetermined time elapsed. If the detected result is affirmative, the procedure goes to step S50, wherein the ordinary operation of the satellite broadcasting signal receiver is resumed; and if otherwise, the procedure goes back to step S45, wherein the range modification picture continues being displayed.
- 12 And, at step S49, it is detected if the display end request signal is inputted or the predetermined time elapsed. If the detected result is affirmative, the procedure goes to step S50; and if otherwise, the procedure goes back to step S43, wherein the program schedule picture of the default range continues being displayed.
As illustrated above, in accordance with the present invention, it is possible to accommodate the user's request interactively, to establish the range of the program schedule picture displayed in one picture at a time.
While the present invention has been described with respect to certain preferred embodiments only, other modifications and variations may be made without departing from the scope of the present invention as set forth in the following claims.
- 13

Claims (6)

Claims:
1. A program schedule display method for use in a satellit broadcast signal receiver, comprising the steps of:
(a) receiving a satellite broadcast signal from a satellite; (b) extracting program schedule information from the received satellite broadcast signal and storing the extracted program schedule information; (c) displaying a program schedule picture of a default range based on the stored program schedule information upon a user's requests; (d) displaying a range modification picture if the user requests to modify the range of program schedule picture displayed in one program schedule picture; and (e) displaying the program schedule picture of the modified range based on the program schedule information if the user inputs the range of the program schedule picture to be modified.
2. The method of claim 1, wherein the program schedule information of the step (b) includes information on contents of a program schedule for each channel, information on a preset number of channels whose program schedules to be displayed in one program schedule picture and information on a predetermined time interval for which the program schedules 14 9 of the preset number of the channels are displayed in one program schedule picture.
3. The method of claim 2, wherein the step (c) displays the contents of a program schedule for each of the preset number of the channels for the predetermined time interval in one program schedule picture.
4. The method of claim 3, wherein the step (d) updates the preset number of the channels and the predetermined time interval with a selected number of channels and a chosen time interval, wherein the selected number of the channels and the chosen time interval is inputted by the user.
5. The method of claim 4, wherein the step (e) displays the contents of a program schedule for each of the selected number of the channels for the chosen time interval in one program schedule picture.
6. A program schedule display method for use in a satellite broadcast signal receiver substantially as herein described with reference to or as shown in Figures 2 to 4B of the accompanying drawings.
- is -
GB9822136A 1997-12-22 1998-10-09 Electronic programme guide with configurable ranges Withdrawn GB2332584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019970071763A KR19990052305A (en) 1997-12-22 1997-12-22 How to Display Program Guide Screen of Satellite Broadcasting Receiver

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Publication Number Publication Date
GB9822136D0 GB9822136D0 (en) 1998-12-02
GB2332584A true GB2332584A (en) 1999-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358778A (en) * 2000-01-25 2001-08-01 Gordon Ross Methods for navigation personalisation and temporal organisation within structured multidimensional information spaces to improve usability and satisfaction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223924A (en) * 1992-05-27 1993-06-29 North American Philips Corporation System and method for automatically correlating user preferences with a T.V. program information database
WO1995001056A1 (en) * 1993-06-22 1995-01-05 Apple Computer, Inc. Methods and apparatus for managing selection of audio-visual program and service offerings
US5534911A (en) * 1994-11-02 1996-07-09 Levitan; Gutman Virtual personal channel in a television system
US5585838A (en) * 1995-05-05 1996-12-17 Microsoft Corporation Program time guide
EP0784405A2 (en) * 1996-01-10 1997-07-16 Sony Corporation Transmission and/or reception of signals
WO1997049242A1 (en) * 1996-06-17 1997-12-24 Starsight Telecast Incorporated System and method for using television schedule information

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223924A (en) * 1992-05-27 1993-06-29 North American Philips Corporation System and method for automatically correlating user preferences with a T.V. program information database
WO1995001056A1 (en) * 1993-06-22 1995-01-05 Apple Computer, Inc. Methods and apparatus for managing selection of audio-visual program and service offerings
US5534911A (en) * 1994-11-02 1996-07-09 Levitan; Gutman Virtual personal channel in a television system
US5585838A (en) * 1995-05-05 1996-12-17 Microsoft Corporation Program time guide
EP0784405A2 (en) * 1996-01-10 1997-07-16 Sony Corporation Transmission and/or reception of signals
WO1997049242A1 (en) * 1996-06-17 1997-12-24 Starsight Telecast Incorporated System and method for using television schedule information

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358778A (en) * 2000-01-25 2001-08-01 Gordon Ross Methods for navigation personalisation and temporal organisation within structured multidimensional information spaces to improve usability and satisfaction

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Publication number Publication date
GB9822136D0 (en) 1998-12-02
KR19990052305A (en) 1999-07-05

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