Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-04-13
2002-04-02
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S428000, C455S556200, C455S557000, C455S420000
Reexamination Certificate
active
06366787
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a cellular telephone used singly or as connected to an information processing apparatus such as a personal computer, PDA (personal digital assistant) or the like, for transmission of data via a radio transmission channel.
2. Description of the Related Art
In Japanese Unexamined Patent Publication JP-A 8-46566(1996) is disclosed a data communication method wherein an information processing apparatus such as a notebook type personal computer is connected to a digital cellular telephone for data communications via a radio transmission channel.
FIG. 4
is a block diagram showing such a known connection between the information processing apparatus and the digital cellular telephone. An information processing apparatus
1
and a digital cellular telephone
2
are interconnected via a digital cellular adapter
3
. The digital cellular adapter
3
is constructed as an IC card so as to be inserted in an IC card slot of the information processing apparatus
1
such as the notebook type personal computer to connect with the information processing apparatus
1
.
The data communication by the digital cellular adapter
3
is performed in a voice band mode and a digital mode. In the case of the data communication in the voice band mode, a modem
4
incorporated in the digital cellular adapter
3
first converts a digital data signal from the information processing apparatus
1
into an analog signal which is converted again to a digital signal by a PCM codec
5
. Thereafter, the digital signal is encoded by an ADPCM codec
6
incorporated in the digital cellular telephone
2
for data compression so that the compressed communication data is transmitted from a radio communication unit
7
to a base station
8
via a radio transmission channel. The digital cellular adapter
3
is controlled by a controller
25
interpreting commands from the information processing apparatus
1
. A reversed procedure is taken for data reception.
In the case of the data communication in the digital mode wherein the digital data is not temporarily converted into the analog signal by the modem
4
as above-mentioned but transmitted as it is, the data is sent to the digital cellular telephone via a data link unit
9
incorporated in the digital cellular adapter
3
. The data link unit
9
serves to encode/decode input/output communication data. The data link unit encodes the communication data inputted from the information processing unit
1
so as to send the coded data to the digital cellular telephone
2
. The radio communication unit
7
of the digital cellular telephone
2
transmits the communication data to the base station
8
via the radio transmission channel. The digital cellular adapter
3
is controlled by the controller
25
interpreting the commands from the information processing apparatus
1
. Received data is decoded by the data link unit
9
of the digital cellular adapter
3
before supplied to the information processing apparatus
1
.
As discussed above, the prior-art digital cellular telephone
2
must be connected to the information processing unit
1
via the digital cellular adapter
3
, and accordingly an independent digital cellular adapter is necessarily required to carry out data communication.
SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a cellular telephone permitting the direct connection to the information processing apparatus for data communications, thus dispensing with the digital cellular adapter.
The invention provides a cellular telephone comprising:
a radio communication unit for carrying out radio communications with a base station;
a serial data communication connection unit directly connected to an information processing apparatus, for transmitting/receiving a signal to/from the information processing apparatus; and
a digital data communication processing unit for encoding/decoding input/output communication data and for interpreting a command from the information processing apparatus so as to apply the command to a controlling unit;
a switching unit interposed between the radio communication unit and the digital data communication processing unit; and
the controlling unit for controlling the radio communication unit and the switching unit based on the command interpreted by the digital data communication processing unit, thereby establishing a data communication channel.
According to the invention, the cellular telephone has the serial data communication connection unit connected to the information processing apparatus so that the cellular telephone transmits/receives the signal to/from the information processing apparatus via the serial data communication connection unit. The command outputted from the information processing apparatus is inputted in the digital data communication processing unit via the serial data communication connection unit. The digital data communication processing unit serves to interpret the command and to convert the command into an understandable form for the controlling unit prior to applying the command to the controlling unit. Responding to the instruction of the digital data communication processing unit, the controlling unit controls the radio communication unit for issuing a call for line request while controlling the switching unit for connection between the digital data communication processing unit and the radio communication unit and thus, the data communication channel is established. The digital data communication processing unit recognizes and encodes the communication data from the information processing apparatus for sending the coded data to the radio communication unit via the switching unit. The radio communication unit, in turn, transmits the communication data via a radio transmission channel established between the radio communication unit and the base station. On the other hand, communication data received by the radio communication unit via the radio transmission channel is decoded by the digital data communication processing unit and sent to the information processing apparatus via the serial data communication connection unit. Thus are provided the data communications between the information processing apparatus and the cellular telephone without the use of the digital cellular adapter.
The invention provides a cellular telephone comprising:
a radio communication unit for carrying out radio communications with a base station;
a first serial data communication connection unit directly connected to an information processing apparatus for transmitting/receiving a signal to/from the information processing apparatus;
a digital data communication processing unit for encoding/decoding input/output communication data and for interpreting a command from the information processing apparatus so as to apply the command to a controlling unit;
a second serial data communication connection unit indirectly connected to the information processing apparatus via an adapter for encoding/decoding input/output communication data and for interpreting a command;
a data judging unit for determining whether the signal from the second serial data communication connection unit represents the command or the communication data and applying the command to the controlling unit but allowing the communication data to pass therethrough;
a switching unit connected to the radio communication unit, the digital data communication processing unit and the data judging unit; and
the controlling unit for, when the information processing apparatus is directly connected to the first serial data communication connection unit, responding to the command from the digital data communication processing unit to control the radio communication unit and the switching unit for establishment of a data communication channel and for, when the information processing apparatus is connected to the second serial data communication connection unit via the adapter, responding to the command from the data judging unit to control the radio communi
Milord Marceau
Trost William
LandOfFree
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