Multiplex communications – Special services – Special feature of multiplex telephone terminal
Reexamination Certificate
1998-07-16
2003-03-25
Kizou, Hassan (Department: 2662)
Multiplex communications
Special services
Special feature of multiplex telephone terminal
C370S459000, C370S465000, C370S468000, C370S535000, C348S014010, C348S014130, C348S384100, C348S461000, C348S462000, C348S465000, C386S349000
Reexamination Certificate
active
06539001
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a visual telephone apparatus and a data compression multiplexing method therefor as well as a recording medium on which a data compression multiplexing control program is recorded, and more particularly to a method for compression production of image or speech data for a visual telephone apparatus and for multiplexing of compression image data, compression speech data and user data.
2. Description of the Related Art
Conventionally, a visual telephone apparatus of the type mentioned (also called television telephone, picturephone and so forth) is used in order to communicate images, speech and user data such as an electronic file over a common public network as recited, for example, in the TTC standards (draft) JT-H324 of a material for the 23
rd
standardization conference by the Telecommunication Technology Committee.
Referring to
FIG. 9
, there is shown in block diagram an exemplary one of conventional visual telephone apparatus. A video I/O (input/output) apparatus
31
images a person who is in front of the visual telephone apparatus
30
, and outputs an image signal obtained by the imaging. A video encoder
32
compresses the image signal inputted thereto from the video I/O apparatus
31
and outputs a resulting compressed image signal.
An audio I/O apparatus
33
collects speech of a person who is in front of the visual telephone apparatus
30
, and outputs the collected speech signal. An audio encoder
34
compresses the speech signal outputted from the audio I/O apparatus
33
and outputs a resulting compressed speech signal. A reception path delay section
35
produces, from a difference between the processing time for image compression and the processing time for speech compression, a delay for preventing a time difference from being produced between outputting of speech and displaying of an image.
A user data application
36
is a télématique apparatus like a computer which outputs user data and may be, for example, such a shared white board as shown in FIG.
8
. Referring to
FIG. 8
, in the shared white board, for example, if an expression “one, to, three, four” is inputted to a white board
22
of a terminal B using a pen
22
a,
then the expression “one, to, three, four” of the white board
22
of the terminal B is displayed on a white board
21
of another terminal A, and that the term “to” is wrong can be pointed out from the terminal B by placing an underline below the word “to” using a pen
21
a
of the terminal A. In this manner, a white board is shared by the terminals A and B.
Referring back to
FIG. 9
, a data protocol section
37
performs framing of user data outputted from the user data application
36
. A system controller
38
develops an instruction of negotiation with the other party visual telephone apparatus (not shown) and an instruction for modem control. A control protocol section
39
converts the instruction of negotiation of the control protocol section
39
to predetermined protocol data.
An SRP (Simple Retransmission Protocol) or LAPM (Link Access Protocol for Modems) (SRP/LAPM) procedure section
40
performs a retransmission procedure for protocol data outputted from the control protocol section
39
. A multiplexer/demultiplexer
41
multiplexes compressed image data outputted from the video encoder
32
, compressed speech data outputted from the reception path delay section
35
, user data outputted from the data protocol section
37
and protocol data outputted from the SRP/LAPM procedure section
40
, and outputs resulting multiplexed data.
A modem
42
outputs the multiplexed data outputted from the multiplexer/demultiplexer
41
to a GSTN (General Switched Telephone Network) network
44
. A modem controller
43
controls the modem
42
in accordance with a modem control instruction outputted from the system controller
38
. An MCU (Multipoint Control Unit)
45
performs control when visual telephone communication is performed at multiple points.
In operation, referring to
FIG. 9
, as an initial condition, the system controller
38
issues a modem control instruction to the modem controller
43
, and the modem
42
which receives the modem control instruction performs communication originating processing to the other party visual telephone apparatus or MCU
45
.
If a communication channel is established through the GSTN network
44
, then the system controller
38
issues an instruction of negotiation with the other party terminal to the control protocol section
39
. The control protocol section
39
produces protocol data from the negotiation instruction.
The protocol data are subject to a retransmission procedure by the SRP/LAPM procedure section
40
and then multiplexing processing by the multiplexer/demultiplexer
41
, whereafter they are transferred to the other party visual telephone apparatus over the GSTN network
44
by the modem
42
. By this operation, matching with regard to the capacity and so forth is established between the visual telephone apparatus
30
and the other party visual telephone apparatus. After the matching operation is completed, a communication condition is entered.
In the communication condition, the video encoder
32
performs compression processing for an image imaged by the video I/O apparatus
31
and outputs a resulting compressed image signal. Simultaneously, the audio encoder
34
performs compression processing for speech collected by the audio I/O apparatus
33
and outputs resulting compressed speech data.
On the transmission side, the reception path delay section
35
outputs the compressed speech data as they are. User data outputted from the user data application
36
such as a shared white board are subject to framing processing by the data protocol section
37
.
Further, an instruction for mode setting or the like outputted from the system controller
38
in accordance with a situation is converted into protocol data by the control protocol section
39
and then subject to a retransmission procedure by the SRP/LAPM procedure section
40
so that control protocol data are outputted. The multiplexer/demultiplexer
41
here performs multiplexing processing of media for the compressed image data outputted from the video encoder
32
, the compressed speech data outputted from the reception path delay section
35
, the framed user data outputted from the data protocol section
37
and the control protocol data outputted from the SRP/LAPM procedure section
40
in accordance with a situation, and outputs resulting multiplexed data.
The multiplexed data are transferred to the other party visual telephone apparatus over the GSTN network
44
from the modem
42
. The multiplexed data received at the modem
42
from the visual telephone apparatus of the originating party are demultiplexed into compressed image data, compressed speech data, user data and control protocol data, which are outputted to the video encoder
32
, reception path delay section
35
, data protocol section
37
and SRP/LAPM procedure section
40
, respectively. The video encoder
32
performs decompression processing for the compressed image data and outputs a resulting image signal. The image signal is displayed by the video I/O apparatus
31
.
The reception path delay section
35
performs delaying processing for compensating for a synchronism displacement between the image and the speech which is produced from a difference between the processing time for coding of the image data and the processing time for coding of the speech data. The compressed speech data outputted from the reception path delay section
35
with the synchronism displacement thereof compensated for are subject to decompression processing by the audio encoder
34
so that they are converted into a speech signal. The speech signal is outputted as speech by the audio I/O apparatus
33
.
The data protocol section
37
performs deframing processing for the framed user data received from the multiplexer/demultiplexer
41
and outputs resulting user data. The user data
Dickstein , Shapiro, Morin & Oshinsky, LLP
Kizou Hassan
Logsdon Joe
LandOfFree
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