Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-01-07
2001-06-26
Vo, Nguyen T. (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S556200
Reexamination Certificate
active
06253093
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wireless communication system, a fixed station device and a mobile station device, and more particularly, applied to a digital cordless telephone system.
2. Description of the Related Art
This type of digital cordless telephone system is comprised of a portable unit which is a cordless telephone and a base unit which is wireless-connected to the portable telephone and is wire-connected to the general telephone network via a wire connection line.
In the digital cordless telephone system, in a state where the base unit is wire-connected to a calling party via the telephone network, the user having the portable unit can talk with the calling party.
In recent years, in such digital cordless telephone system, the portable unit is connected, for example, to a personal computer (hereinafter, referred to as a PC) and this system has been used in the data communications between the PC and a PC of the party of data communications (hereinafter, referred to as a communicating party) which is wire-connected via the telephone network. Thus, the digital cordless telephone system has not been used only as a telephone but the range of its applications has been expanding.
In practice, as shown in
FIG. 4
, in a portable unit
1
of the digital cordless telephone system, when making a call (i.e., when making a call to the prescribed calling party from the portable unit
1
), the user inputs call information by operating an operation key section
2
comprised of call keys and dial keys and thereby, first call information data D
1
in digital form is sent from the operation key section
2
to a control unit
4
via a man machine interface
3
. In this connection, the call information data D
1
to be outputted from the operation key section
2
is also sent to a liquid crystal display (LCD)
5
via the man machine interface
3
, and the LCD
5
displays call information shown by the inputted first call information data D
1
(i.e., telephone number of the calling party).
In this case, the control unit
4
, upon converting the data inputted from the man machine interface
3
into the data having a predetermined data format according to the data transmission by compression and the like (hereinafter, referred to as the format for transmission), transmits the data to a high frequency unit
6
and more over, converts the data inputted from the high frequency unit
6
into the data having the same data format as the data to be inputted from the man machine interface (hereinafter, referred to as the format for I/F)
3
by demodulation and the like. Thus, the control unit
4
converts the first call information data D
1
inputted from the man machine interface
3
into the second call information data D
2
having the format for transmission to output the data to the high frequency unit
6
.
The high frequency unit
6
modulates the data inputted from the control unit
4
based on the control of the control unit
4
with a predetermined format to transmit the resultant transmission data to the base unit (not shown) via an antenna (hereinafter referred to as a portable unit side antenna) and moreover, receives the transmission data transmitted from the base unit via the portable unit side antenna, and demodulates the received transmission data based on the control of the control unit
4
with the predetermined format to modulate to the data having the aforementioned format for transmission. Thus, the high frequency unit
6
modulates the second call information data D
2
inputted from the control unit
4
and transmits the resultant transmission data (hereinafter, referred to as call transmission data) D
3
to the base unit via the portable unit side antenna.
At this point, when the base unit receives the call transmission data D
3
and is wire-connected to the calling party via the telephone network based on the received call transmission data D
3
, the portable unit
1
receives the user's voice by a microphone
8
.
The microphone
8
, after converting an audio signal (hereinafter, referred to as a user audio signal) S
1
which is analog corresponding to the inputted user's voice into voice data (hereinafter, referred to as first user voice data) D
4
formed of digital data via an analog-to-digital converter (hereinafter, referred to as A/D converter)
9
, transmits the voice data D
4
to the control unit
4
via the man machine interface
3
.
The control unit
4
converts the inputted first user voice data D
4
into the voice data (hereinafter, referred to as second user voice data) D
5
having the format for transmission to transmits this to the high frequency unit
6
.
The high frequency unit
6
modulates the inputted second user voice data D
5
to transmit the resultant transmission data (hereinafter, referred to as voice transmission data) D
6
to the base unit via the portable unit side antenna
7
. Moreover, the high frequency unit
6
, upon receiving transmission data (hereinafter, referred to as the other party side transmission data) D
7
corresponding to the voice data of the calling party (hereinafter, referred to as other party side voice data) transmitted from the base unit via the portable unit side antenna
7
, demodulates the data D
7
and transmits the resultant other party side voice data (hereinafter, referred to as first other party side voice data) D
8
to the control unit
4
.
The control unit
4
converts the inputted first other party side voice data D
8
into other party side voice data D
9
formed of the format for I/F (hereinafter, referred to as second other party side voice data) to transmit to the digital-to-analog converter (hereinafter, referred to as D/A converter)
10
via the man machine interface
3
. The D/A converter
10
converts the second other party side voice data D
9
into an audio signal (hereinafter, referred to as an other party side audio signal) S
2
which is analog to transmit to a speaker
11
. With this arrangement, in the portable unit
1
, voice of the calling party is uttered from the speaker
11
. Thus, the user can talk with the calling party with the portable unit
1
.
Furthermore, when a call arrives (i.e., when receiving a call from the calling party), the portable unit
1
receives transmission data (hereinafter, referred to as ringer transmission data) D
10
which is transmitted from the base unit and corresponds to ringer data to be obtained from the calling party by the high frequency unit
6
, and the high frequency unit
6
demodulates the received ringer transmission data D
10
to transmit the resultant first ringer data D
11
to the control unit
4
.
The control unit
4
converts the inputted first ringer data D
11
into second ringer data D
12
having the format for transmission to transmit the second ringer data D
12
to a ringer
12
via the man machine interface
3
. Thereby, the ringer
12
produces a ringer sound such as bell depending on the inputted second ringer data D
12
. Accordingly, the user knows the arrival of telephone call according to the ringer sound produced by the ringer
12
, and then the user operates, for example, the call keys of the operation key section
2
to wire-connect the portable unit
1
to the calling party. Thus, the user and the calling party can communicate in the same way as the case of making a call described above.
Here, in the case of using the portable unit
1
for the data communications, a PC
15
is connected to an earphone jack
13
which is provided in the portable unit
1
via a modem unit
14
.
In this case, in a state where the base unit is wire-connected to the communicating party of the data communications in the same way as the case of making a call or receiving a call described above, the PC
15
transmits digital data to be communicated D
13
(hereinafter, referred to as first digital data) which is inputted by operating a keyboard or the like provided to the PC
15
by the user, to the modem unit
14
.
The modem unit
14
, forming a first modulated wave signal S
3
showing the inputte
Maioli Jay H.
Nguyen Duc
Sony Corporation
Vo Nguyen T.
LandOfFree
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