WO2002078326A1 - Image telecommunication system for personal digital assistant and a control method thereof - Google Patents

Image telecommunication system for personal digital assistant and a control method thereof Download PDF

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Publication number
WO2002078326A1
WO2002078326A1 PCT/KR2001/002210 KR0102210W WO02078326A1 WO 2002078326 A1 WO2002078326 A1 WO 2002078326A1 KR 0102210 W KR0102210 W KR 0102210W WO 02078326 A1 WO02078326 A1 WO 02078326A1
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WO
WIPO (PCT)
Prior art keywords
signals
voice
image
outputting
camera
Prior art date
Application number
PCT/KR2001/002210
Other languages
French (fr)
Inventor
Do-Seung Yang
Original Assignee
Hanvit Information Technology 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
Priority claimed from KR1020010067016A external-priority patent/KR20020076110A/en
Application filed by Hanvit Information Technology Co., Ltd. filed Critical Hanvit Information Technology Co., Ltd.
Publication of WO2002078326A1 publication Critical patent/WO2002078326A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
    • H04N2007/145—Handheld terminals

Definitions

  • the present invention relates to an image communication terminal
  • PDAs personal digital assistants
  • PIM personal information management
  • IMT-2000 will be implemented in the near future.
  • the H.323 protocol has been established by the ITU in order to connect personal computers with common telephone networks.
  • WinCE stacks on a PDA basis
  • extension pack for concurrently supporting a CF interface in which a digital
  • PSTN public switched telephone network
  • a videophone terminal system In one aspect of the present invention, a videophone terminal system
  • a camera for capturing a user's image and outputting it; a case system, in which the camera is installed, for interfacing an output signal of
  • the camera converting input and output signals into wireless signals
  • a videophone terminal In another aspect of the present invention, a videophone terminal
  • system comprises: a camera for capturing a user's image and outputting it;
  • image signals input by the camera and voice input by an internal microphone converting them, wirelessly transmitting them, restoring image and voice
  • the information terminal comprising: an interface for interfacing output signals of the camera;
  • a microphone for receiving voice and outputting it; an image and voice
  • compressor for receiving voice and image signals from the microphone and the interface, compressing them, and outputting them; a controller for controlling to transmit the images and voice compressed by the image and
  • voice compressor through a wireless network, and controlling to restore received signals; a modem for converting compressed signals output by the controller through the interface to fit wireless environments, converting
  • controlling a videophone terminal system comprises: a compact flash type
  • FIG. 1 shows a videophone terminal system according to a first
  • FIG. 2 shows an outer appearance of the videophone terminal
  • FIG. 3 shows a video communication process
  • FIG. 4 shows a flowchart for controlling the videophone terminal
  • FIG. 5 shows a videophone terminal system according to a second
  • FIG. 6 shows an outer appearance of the videophone terminal
  • FIG. 1 shows a videophone terminal system according to a first
  • the videophone terminal system comprises a camera 100,
  • the camera 100 captures a user's image and outputs it. The case
  • system 200 equipped with the camera 100, interfaces the camera's output
  • the information terminal 300 compresses image signals input
  • system 200 restores received image and voice signals, and outputs restored
  • FIG. 2 shows an outer appearance of the videophone terminal
  • the videophone terminal system comprises an information terminal 300 including a liquid crystal display (LCD) 350 and a LCD (LCD) 350 and a LCD (LCD) 350.
  • LCD liquid crystal display
  • capturing function is installed on a connector 210 of a CF-type slot format
  • a speaker 360 are installed in the information terminal 300.
  • a compact flash interfaces the digital camera 100 and the
  • a user manipulates a keypad 330 of the information terminal
  • Transmission information is transmitted by control of a controller 340
  • step S401 through an interface 220, a modem 230, and an antenna 240 in step S401 .
  • the transmission information is transmitted to a corresponding service
  • the prior art PSTN 40 that is, an H.323/CDMA
  • data network comprises 95C networks 41 and 42; a gateway keeper 43; a
  • MCU multi-point conference controller
  • the CF-type digital camera 100 having an image data capturing
  • a pickup device 120 converts the
  • An analog/digital (A/D) converter 130 converts the analog signals
  • an interface 140 interfaces digital signals
  • the interface 220 interfaces the image signals to an image
  • the image input unit 322 through the connectors 250 and 380.
  • the image input unit 322
  • the microphone 310 in the information terminal 300 receives the
  • a voice and image compressor unit 320 has recording and reproducing functions, and the information terminal 300 uses
  • the digital camera 100 to capture image data at 15 to 20 frames per second
  • the modem 230 transmits data to the PSTN 40, that is, the H.323/CDMA
  • step S406 the connected person checks whether data exists in step S406, decompresses the images and the voice, reproduces the image and
  • the compressed signals transmitted by the connected person are:
  • modem 230 converts the compressed signals to fit wire environments
  • the controller 340 transmits the corresponding compressed signals to an
  • An image restorer 371 restores the compressed image signals
  • a voice restorer 372 restores the compressed voice signals through
  • voice signals can be executed using a single video and audio CODEC, and
  • the user can call another person and see their
  • step S409 After this, when the user terminates the call in step S409.
  • the users can talk over the videophone without disconnection, as if in person.
  • the standard wireless communication function linked with the PSTN linked with the PSTN
  • the standard wireless communication implements the H.323 stacks on the PDA (WinCE) basis, uses the wireless PSTN 40 to link the PDA 300 to the conventional communication networks
  • the image and voice compression function implements the compression or the restoration of the image and voice signals input by a
  • the wireless network is configured to
  • FIG. 5 shows a videophone terminal system according to the second
  • the videophone terminal system comprises a camera 500, an interface 620, a microphone 710, an image and voice compressor 720, a controller 740, a modem 630, an antenna 640, an image and voice restorer 770, a speaker 760, and an LCD 750.
  • the camera 500 captures the user's image and outputs it, and the
  • the interface 620 interfaces the output signal of the camera 500.
  • the microphone 710 receives voice and outputs it.
  • compressor 720 receives voice and image signals from the microphone and the interface, compresses them and outputs them.
  • compressor 720 to be transmitted via a wireless network, and controls
  • the modem 630 converts the
  • the antenna 640 wirelessly radiates the signals output through the modem 630, and the image and voice restorer 770 restores the compressed
  • the speaker 760 outputs
  • the second preferred embodiment installs the interface 620, the modem 630, and the antenna 640 provided to the case system in the configuration of the first preferred embodiment in the information terminal.
  • FIG. 6 shows the outer appearance of the second preferred embodiment.
  • the camera 500 is installed on the rear portion of the information terminal in the CF-type, and its outer appearance can be varied. Since the operation of the second
  • the video communication is enabled by using only the information terminal, and not the case system.
  • the present invention can be applied to the IMT-2000 communication network by
  • PDA user can manage personal information, navigate the wireless Internet
  • the videophone function can be implemented between the PDA. Also, the videophone function can be implemented between the PDA.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed is a videophone terminal system which comprises: a camera (100) for capturing a user's image and outputting it; a case system (200), in which the camera (100) is installed, for interfacing output signals of the camera (100), converting input and output signals into wireless signals, and transmitting and receiving the same; and an information terminal (300) for compressing image signals input by the case system (200) and voice signals input by an internal microphone, controlling them to be transmitted to a corresponding connected person through the case system (200), restoring received image and voice signals, and outputting them. Therefore, users can conveniently use videophone services.

Description

IMAGE TELECOMMUNICATION SYSTEM FOR PERSONAL DIGITAL ASSISTANT AND A CONTROL METHOD THEREOF
BACKGROUND OF THE INVENTION (a) Field of the Invention
The present invention relates to an image communication terminal
system and a control method thereof. More specifically, the present invention
relates to an image communication terminal system and a control method
thereof for videophone and data communication on the basis of the H.323
protocol.
(b) Description of the Related Art
In general, personal digital assistants (PDAs) are mainly used for
providing personal information management (PIM) functions such as an
electronic purse, for storing address lists and memos, schedule management,
and for reproducing music using an MP3 player.
Recently, users' requests for information communication have
increased, and the users have desired portable terminals with various
functions including navigating the Internet, communicating via electronic mail
or fax, and calling using the PDA, and accordingly, image/voice calling by the
IMT-2000 will be implemented in the near future.
As described, the need for a PDA having the image/voice calling
function desired by the users has gradually increased, but a PDA that
satisfies these needs has not yet been manufactured.
In detail, the H.323 protocol has been established by the ITU in order to connect personal computers with common telephone networks. The
conventional stacks (or libraries) for supporting the H.323 have already been
developed and managed on the PC basis (Windows and Linux).
However, the stacks (or libraries) for supporting the H.323 in the
PDAs (on the basis of WinCE) and mobile terminals have not been
developed. Also, since in the conventional wireless communication terminals through which the PDAs use the CDMA method, the CDMA terminal and the
digital camera with a compact flash (CF) interface cannot be simultaneously used, and therefore, the video phone function cannot be implemented between PDAs, between a PDA and a PC, and between a PDA and a
videophone.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a videophone
terminal system and a control method for implementing videophone communication between PDAs, between a PDA and a PC, and between a
PDA and a videophone, and improving the convenience of PDA usage.
It is another object of the present invention to implement H.323
stacks on a PDA basis (WinCE) so as to link a PDA to conventional
communication network service providers (e.g., 019, 011 , 016, 017, and 018
phone-numbered communication network service providers) using a wireless
network, and to implement videophone communication between PDAs,
between a PDA and a PC, and between a PDA and a videophone, and to be convertible with the communication network service providers.
It is still another object of the present invention to provide a PDA
extension pack for concurrently supporting a CF interface in which a digital
camera is installed and a CDMA module interface that supports the 95C
network.
It is still another object of the present invention to concurrently
provide a CDMA interface and a CF interface so that data communication using the CDMA method and image data capturing using the CF interface may be concurrently used.
It is a further object of the present invention to access a public switched telephone network (PSTN) through a CDMA module accessed to a PDA and to use a digital camera, a recorder, and a speaker between users so as to provide a videophone service for transmitting and receiving images
and voices. In one aspect of the present invention, a videophone terminal system
comprises: a camera for capturing a user's image and outputting it; a case system, in which the camera is installed, for interfacing an output signal of
the camera, converting input and output signals into wireless signals, and
transmitting and receiving the same; and an information terminal for
compressing image signals input by the case system and voice signals input
by an internal microphone, controlling them to be transmitted to a
corresponding connected person through the case system, restoring
received image and voice signals, and outputting them. In another aspect of the present invention, a videophone terminal
system comprises: a camera for capturing a user's image and outputting it;
and an information terminal in which the camera is installed, for compressing
image signals input by the camera and voice input by an internal microphone, converting them, wirelessly transmitting them, restoring image and voice
signals received from the outside, and outputting them, the information terminal comprising: an interface for interfacing output signals of the camera;
a microphone for receiving voice and outputting it; an image and voice
compressor for receiving voice and image signals from the microphone and the interface, compressing them, and outputting them; a controller for controlling to transmit the images and voice compressed by the image and
voice compressor through a wireless network, and controlling to restore received signals; a modem for converting compressed signals output by the controller through the interface to fit wireless environments, converting
received wireless signals to fit wire environments, and outputting them to a controller through the interface; an antenna for wirelessly radiating signals output through the modem; an image and voice restorer for restoring the
compressed signals according to control by the controller; a speaker for
outputting voice restored by the image and voice restorer; and a display for
displaying images restored by the image and voice restorer.
In still another aspect of the present invention, a method for
controlling a videophone terminal system comprises: a compact flash type
camera capturing a user's image and outputting it; an information terminal receiving output signals from the camera and voice signals from the
microphone, compressing the image signals through an H.263 (video
CODEC) and the voice signals through a G723.1 (audio CODEC); and a
wireless modem of a case system converting the compressed signals into
wireless signals and transmitting them.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are incorporated in and
constitute a part of the specification, illustrate an embodiment of the
invention, and, together with the description, serve to explain the principles
of the invention:
FIG. 1 shows a videophone terminal system according to a first
preferred embodiment of the present invention;
FIG. 2 shows an outer appearance of the videophone terminal
system according to a first preferred embodiment of the present invention;
FIG. 3 shows a video communication process;
FIG. 4 shows a flowchart for controlling the videophone terminal
system according to a first preferred embodiment of the present invention;
FIG. 5 shows a videophone terminal system according to a second
preferred embodiment of the present invention; and
FIG. 6 shows an outer appearance of the videophone terminal
system according to a second preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following detailed description, only the preferred embodiment
of the invention has been shown and described, simply by way of illustration
of the best mode contemplated by the inventor(s) of carrying out the
invention. As will be realized, the invention is capable of modification in
various obvious respects, all without departing from the invention.
Accordingly, the drawings and description are to be regarded as illustrative in
nature, and not restrictive.
FIG. 1 shows a videophone terminal system according to a first
preferred embodiment of the present invention.
As shown, the videophone terminal system comprises a camera 100,
a case system 200 and an information terminal 300.
The camera 100 captures a user's image and outputs it. The case
system 200, equipped with the camera 100, interfaces the camera's output
signals, converts input/output signals into wireless signals and transmits and
receives them. The information terminal 300 compresses image signals input
by the case system 200 and voice signals input through an internal
microphone, controls them to be transferred to a connected user via the case
system 200, restores received image and voice signals, and outputs restored
signals.
FIG. 2 shows an outer appearance of the videophone terminal
system according to a first preferred embodiment of the present invention.
Referring to FIG. 2, the videophone terminal system comprises an information terminal 300 including a liquid crystal display (LCD) 350 and a
connector 380; and a case system 200 formed to receive and fix the
information terminal 300, including a connector 250 for connection with the
information terminal 300. A digital camera 100 having a CF-type image data
capturing function is installed on a connector 210 of a CF-type slot format,
formed on a top portion of the case system 200, and a microphone 310 and
a speaker 360 are installed in the information terminal 300.
A compact flash interfaces the digital camera 100 and the
information terminal 300.
An operation of the videophone terminal system will now be
described.
Initially, a user manipulates a keypad 330 of the information terminal
300 to execute a video call with another person.
Transmission information is transmitted by control of a controller 340
through an interface 220, a modem 230, and an antenna 240 in step S401 .
The transmission information is transmitted to a corresponding service
provider through a CDMA network 13 and a PSTN 40, and is then
transmitted to the other person's videophone or information terminal
according to control by the service provider.
Referring to FIG. 3, the prior art PSTN 40, that is, an H.323/CDMA
data network, comprises 95C networks 41 and 42; a gateway keeper 43; a
multi-point conference controller (MCU) 44; a media gateway 45; and a
shared gateway 46. When receiving a corresponding signal, a recipient is connected to a
call by allowing the signal to go through. That is, when the person responds
to a call connection signal, the call is connected in step S402.
The CF-type digital camera 100 having an image data capturing
function captures the user's images, and a lens 110 outputs color
components of an object in the light format. A pickup device 120 converts the
light into electrical charges, temporarily stores the same and outputs them as
electrical signals. An analog/digital (A/D) converter 130 converts the
electrical signals into digital signals, and an interface 140 interfaces digital
image signals to an interface 220 of the case system 200 through connectors
150 and 210.
After this, the interface 220 interfaces the image signals to an image
input unit 322 through the connectors 250 and 380. The image input unit 322
converts the image signals into a format to be processed by the information
terminal 300 through a device driver in step S403. An image compressor 324
compresses the input image signals through the H.263 (video coder/decoder
(CODEC)) in step S404.
The microphone 310 in the information terminal 300 receives the
user's voice and outputs the same as voice signals. A voice input unit 321
receives the voice signals and converts them into a format to be processed
by the information terminal 300 in step S403. A voice compressor 323
compresses the voice input by the microphone 310 through the G.723.1
(audio CODEC). In this instance, a voice and image compressor unit 320 has recording and reproducing functions, and the information terminal 300 uses
the digital camera 100 to capture image data at 15 to 20 frames per second,
and records voice input through the microphone 310 of the PDA 20. The
above-noted voice compression function using the G723.1 is improved from
the conventional G.723.1/G.723 CODEC method, compression time is
improved to 10 to 12ms from the existing time of 35 to 40ms, and decoding
time is improved to 0.5ms from the existing time of 1 ms. The image
compression function using the H.263 is improved from the existing H.261
recommendation by removing duplication of time direction using motion
estimation and compensation and by removing duplication of space direction
using conversion coding. An input ratio stream buffer and an output ratio
stream buffer in the PDA assign about 26kB, and an image buffer uses
760kB to store 20 frames and automatically adjusts transmission amount
according to the wireless network states, thereby adding a function of
transmitting more image frames.
When the image compressor 324 and the voice compressor 323
respectively output compressed image and voice signals, the controller 340
transmits the compressed signals to the modem 230 through the connectors
380 and 250 and the interface 220. When receiving the compressed signals,
the modem 230 transmits data to the PSTN 40, that is, the H.323/CDMA
data network, through the antenna 240 in a wireless communication method
(TCP/IP) in step S405.
After this, the connected person checks whether data exists in step S406, decompresses the images and the voice, reproduces the image and
voice data using reproduction software executed by the information terminal,
and the data are then transmitted according to the above-described
transmission process.
The compressed signals transmitted by the connected person are
transmitted to the modem through the antenna 240 in step S407, and the
modem 230 converts the compressed signals to fit wire environments and
outputs the converted signals to the controller 340 through the interface 220.
The controller 340 transmits the corresponding compressed signals to an
image and voice restoration unit 370 to restore the compressed signals.
An image restorer 371 restores the compressed image signals
through the H.263 (video CODEC) and outputs them to an LCD 350 in step
S408. A voice restorer 372 restores the compressed voice signals through
the G723.1 (audio CODEC) and outputs them to the speaker 360 in step
S408. Here, the compression and restoration functions of the image and
voice signals can be executed using a single video and audio CODEC, and
they can be modified by a skilled person.
Accordingly, the user can call another person and see their
appearance in step S409. After this, when the user terminates the call in step
S410, the camera 100 and the microphone do not receive images and voice.
As described above, when a transmission user calls a user who
attempts to videophone and is connected to the user, the present invention
captures and compresses images and voice in real-time and transmits them to the connected person via a wireless network, and the connected person
receives the images and the voice and decompresses them to restore them
as original images and voice, and accordingly, the images are displayed on a
PDA screen and the voice is reproduced through a PDA speaker, and hence,
the users can talk over the videophone without disconnection, as if in person. The standard wireless communication function linked with the PSTN
40 implements the H.323, that is, the standard protocol of the wireless
network configured by the wireless communication service providers such as 019, 011 , 016, 017 phone-numbered service providers as software in the
information terminal 300 so that users of different networks may perform videophone communication. That is, the standard wireless communication implements the H.323 stacks on the PDA (WinCE) basis, uses the wireless PSTN 40 to link the PDA 300 to the conventional communication networks
and be compatible with the 019, 011 , 016, 017, and 018 phone-numbered communication service providers so that the videophone function can be
implemented between PDAs, between a PDA and a PC, and between a PDA
and a videophone.
Also, the image and voice compression function implements the compression or the restoration of the image and voice signals input by a
camera or a recorder through the H.263 (Video) and the G723.1 (Audio) into
PDA software, and accordingly, the wireless network is configured to
minimize the size of the image/voice data such that the actually transmitted
images or voice are as if those generated are spoken in front of the user without disconnection.
The first preferred embodiment can be variously modified by a skilled
person, and a second preferred embodiment for implementing the present
invention using an information terminal and a camera without a case system
will now be described with reference to FIGs. 5 and 6.
FIG. 5 shows a videophone terminal system according to the second
preferred embodiment of the present invention.
As shown, the videophone terminal system comprises a camera 500, an interface 620, a microphone 710, an image and voice compressor 720, a controller 740, a modem 630, an antenna 640, an image and voice restorer 770, a speaker 760, and an LCD 750.
The camera 500 captures the user's image and outputs it, and the
interface 620 interfaces the output signal of the camera 500. The microphone 710 receives voice and outputs it. The image and voice
compressor 720 receives voice and image signals from the microphone and the interface, compresses them and outputs them. The controller 740
controls the image and voice signals compressed by the image and voice
compressor 720 to be transmitted via a wireless network, and controls
received compressed signals to be restored. The modem 630 converts the
compressed signals output by the controller 740 through the interface 620
into wireless environments, converts received wireless signals into wire environments, and outputs them to the controller 740 through the interface
620. The antenna 640 wirelessly radiates the signals output through the modem 630, and the image and voice restorer 770 restores the compressed
signals according to control by the controller 740. The speaker 760 outputs
the voice restored by the image and voice restorer 770, while the LCD 750
displays the images restored by the image and voice restorer 770.
The second preferred embodiment installs the interface 620, the modem 630, and the antenna 640 provided to the case system in the configuration of the first preferred embodiment in the information terminal.
FIG. 6 shows the outer appearance of the second preferred embodiment.
Referring to FIG. 6, in the second preferred embodiment, the camera 500 is installed on the rear portion of the information terminal in the CF-type, and its outer appearance can be varied. Since the operation of the second
preferred embodiment is identical with that of the respective units of the first preferred embodiment, no further description will be provided. In the second preferred embodiment, the video communication is enabled by using only the information terminal, and not the case system.
When the communication network expands to the IMT-2000, the present invention can be applied to the IMT-2000 communication network by
upgrading the CDMA portion.
Since the videophone function can be possible through the PDA, the
PDA user can manage personal information, navigate the wireless Internet
and communicate with a desired person as if face-to-face at any time using
the PDA. Also, the videophone function can be implemented between the
PDAs, between the PDA and the PC, and between the PDA and the videophone. Further, since the present, invention provides a PDA case
system that concurrently supports the CF interface in which a digital camera
is installed and the CDMA module interface that supports the 95C network
and hence concurrently supports the CDMA and the CF interface, the data
communication process using the CDMA and the image data capturing process using the CF interface can be used simultaneously.
While this invention has been described in connection with what is
presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed
embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A videophone terminal system comprising:
a camera for capturing a user's image and outputting it;
a case system, in which the camera is installed, for interfacing an
output signal of the camera, converting input and output signals into wireless
signals, and transmitting and receiving the same; and
an information terminal for compressing image signals input by the
case system and voice signals input by an internal microphone, controlling
them to be transmitted to a corresponding person through the case system,
restoring received image and voice signals, and outputting them.
2. The system of claim 1 , wherein the case system comprises:
an interface for interfacing output signals of the camera;
a modem for converting compressed signals output by the
information terminal through the interface to fit wireless environments,
converting received wireless signals to fit wire environments, and outputting
them to a controller through the interface; and
an antenna for wirelessly radiating signals output through the
modem, and transmitting received wireless signals to the modem.
3. The system of claim 1 , wherein the information terminal
comprises:
a microphone for receiving voice and outputting it;
an image and voice compressor for receiving voice and image
signals from the microphone and an interface, compressing them, and outputting them;
a controller for controlling to transmit images and voice compressed
by the image and voice compressor through a wireless network, and
controlling to restore received signals;
an image and voice restorer for restoring the compressed signals
according to control by the controller;
a speaker for outputting voice restored by the image and voice
restorer; and
a display for displaying images restored by the image and voice
restorer.
4. The system of claim 1 , wherein an image and voice compressor
compresses image signals through an H.263 (video coder/decoder
(CODEC)), and compresses voice signals through a G723.1 (audio CODEC).
5. The system of claim 1 , wherein the camera is a compact flash
type.
6. The system of claim 5, wherein the camera comprises:
a lens for outputting color components of an object in the light form;
a pickup device for converting the light into electrical charges,
temporarily storing them, and outputting them as electrical signals;
an analog/digital (A/D) converter for converting the electrical signals
into digital signals; and
an interface for interfacing the digital signals to the case system.
7. A videophone terminal system comprising: a camera for capturing a user's image and outputting it; and
an information terminal in which the camera is installed, for
compressing image signals input by the camera and voice input by an
internal microphone, converting them, wirelessly transmitting them, restoring
image and voice signals received from the outside, and outputting them, the
information terminal comprising:
an interface for interfacing output signals of the camera;
a microphone for receiving voice and outputting it;
an image and voice compressor for receiving voice and image
signals from the microphone and the interface, compressing them, and
outputting them;
a controller for controlling to transmit the images and voice
compressed by the image and voice compressor through a wireless network,
and controlling to restore received signals;
a modem for converting compressed signals output by the controller
through the interface to fit wireless environments, converting received
wireless signals to fit wire environments, and outputting them to a controller
through the interface;
an antenna for wirelessly radiating signals output through the
modem;
an image and voice restorer for restoring the compressed signals
according to control by the controller;
a speaker for outputting voice restored by the image and voice restorer; and
a display for displaying images restored by the image and voice
restorer.
8. A method for controlling a videophone terminal system
comprising:
a compact flash type camera capturing a user's image and
outputting it;
an information terminal receiving output signals from the camera and
voice signals from a microphone, compressing the image signals through an
H.263 (video CODEC) and the voice signals through a G723.1 (audio
CODEC); and
a wireless modem of a case system converting the compressed
signals into wireless signals and transmitting them.
9. The method of claim 8, wherein the method further comprises:
restoring image signals through an H.263 (video CODEC) and voice signals
through a G723.1 (audio CODEC) when compressed image and voice
signals are wirelessly received from the outside, and outputting them.
PCT/KR2001/002210 2001-03-26 2001-12-19 Image telecommunication system for personal digital assistant and a control method thereof WO2002078326A1 (en)

Applications Claiming Priority (4)

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KR2001/15604 2001-03-26
KR20010015604 2001-03-26
KR1020010067016A KR20020076110A (en) 2001-03-26 2001-10-30 Image telecommunication system for Personal digital assistant and a control method thereof
KR2001/67016 2001-10-30

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CN100458844C (en) * 2003-04-18 2009-02-04 深圳市朗科科技股份有限公司 Digital image processing device and method

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