JP4284088B2 - Communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication apparatus that is used in a wireless communication system intended for a mobile object such as an automobile and executes different signal processing for each communication mode.
[0002]
[Prior art]
In recent years, as for services for automobiles, in addition to navigation services using GPS (Global Positioning System) satellites, services such as ETC (Electronic Toll Collection) that automates toll collection on toll roads have also started. . In addition to the current AM and FM broadcasts, the launch of digital broadcasts for mobiles is also scheduled recently.
[0003]
By the way, when a wide variety of services are provided in the future, in order to use each service, it is necessary to purchase and install a dedicated device for each service, which takes a lot of labor and cost. It will be.
[0004]
Further, when the number of desired services increases, installation space for dedicated devices corresponding to the number of services is required in the automobile. For this reason, a dedicated device cannot be mounted due to space restrictions, and a significant inconvenience occurs for the convenience of the user.
Therefore, recently, there has been proposed a communication apparatus that can receive an arbitrary broadcast / communication service by incorporating a plurality of modulation / demodulation circuits corresponding to each broadcast / communication service.
[0005]
[Problems to be solved by the invention]
Since the communication apparatus can enjoy a plurality of broadcasting / communication services by one unit, there is an advantage that the effect on space is high. However, when a new service is added, a modulation / demodulation circuit corresponding to the new service must be incorporated, so that the design of the interface configuration must be changed. Even in the same service, the communication mode may be different, and modulation / demodulation circuits corresponding to the number of communication modes are required. For this reason, there exists a malfunction that a circuit scale, cost, and power consumption will increase significantly.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a communication device that can flexibly process a plurality of communication signals having different modes, and that can realize downsizing, cost reduction, and power consumption. There is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a communication apparatus according to the present invention is configured as follows.
(1) A parameter information storage unit for storing parameter information for specifying the processing content of a communication signal for each communication mode, and a common part extracted from a plurality of signal processing circuits having different communication modes, and different parts depending on the communication mode A communication signal processing unit that selectively sets parameter information, inputs a communication signal, and executes signal processing based on the set parameter information, and according to a required communication mode. A control unit that selectively reads out parameter information from the parameter information storage unit, sets the parameter information in the communication signal processing unit, and processes the communication signal based on the parameter information set in the communication signal processing unit; It is intended to provide.
[0008]
In the configuration of (1), the communication signal processing unit extracts a common part from a plurality of signal processing circuits having different communication modes, and individually sets different parts depending on the communication mode, and sets parameter information according to the communication mode. This makes it possible to select different parts. That is, when executing a desired communication mode, parameter information corresponding to the communication mode is read from the parameter information storage unit, and this parameter information is set in the communication signal processing unit, so that processing of an arbitrary communication mode is performed. Will be executed.
[0009]
Accordingly, there is no need to incorporate a dedicated signal processing circuit corresponding to each mode, so that the size and cost can be reduced correspondingly, and the control unit performs the communication signal processing unit with respect to the communication signal switching process. It is only necessary to transmit the parameter information for specifying the processing content of the communication signal according to the communication mode as control information, which makes it easier and easier than setting circuit information for realizing an arbitrary communication mode. The mode can be changed in a short time.
[0010]
(2) The communication signal processing unit includes one common circuit in which common parts of the plurality of signal processing circuits are integrated, and an input circuit for the parameter information.
According to the configuration of (2), downsizing and low power consumption of the entire device can be achieved by integration.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a communication apparatus according to an embodiment of the present invention. This communication apparatus includes, for example, an ETC antenna 1, an FM / AM radio antenna 2, and a GPS antenna 3.
[0012]
A radio frequency signal arriving from the outside is received by at least one of the ETC antenna 1, the FM / AM radio antenna 2, and the GPS antenna 3, and then is converted into an intermediate frequency signal or a baseband signal by the radio circuit 4. Converted.
[0013]
The received intermediate frequency signal or baseband signal is converted into a digital signal by an A / D (analog / digital) conversion circuit 5 and then input to a signal processing circuit 6. The signal processing circuit 6 processes the received reception intermediate frequency signal or baseband signal based on the control by the control circuit 7.
[0014]
The control circuit 7 executes the overall control function of the entire communication device based on the program stored in the memory 8, and as the control function, performs wireless connection control according to outgoing / incoming calls and enables data communication Communication control function, system selection control function, location registration control function, etc.
[0015]
On the other hand, at the time of data transmission, the signal processing circuit 6 supplies digital data to be transmitted to the A / D conversion circuit 5. The A / D conversion circuit 6 converts the digital data into a transmission signal and outputs the transmission signal to the radio circuit 4.
[0016]
The radio circuit 4 converts the input transmission signal into a radio frequency signal. Then, the radio circuit 4 amplifies only the effective portion of the radio frequency signal based on the transmission data rate notified by the control circuit 7 and outputs it as a transmission radio frequency signal. The transmission radio frequency signal output from the radio circuit 4 is transmitted via the ETC antenna 1.
[0017]
The operation unit 9 is provided with a key group such as a dial key, a power key, an end key, a volume adjustment key, and a mode designation key.
[0018]
By the way, in this embodiment, parameter information for specifying processing contents of communication signals corresponding to a plurality of different broadcasting / communication service functions is stored in the memory 8 for each communication mode. The parameter information includes a modulation method, transmission frequency, reception frequency, transmission data rate, reception data rate, transmission filter coefficient, reception filter coefficient, and the like.
[0019]
Then, the control circuit 7 reads the corresponding parameter information from the memory 8 according to the communication mode requested by the designation operation by the user from the operation unit 9 and sets the parameter information in the signal processing circuit 6.
[0020]
FIG. 2 is a block diagram showing a specific configuration of the signal processing circuit 6.
In this signal processing circuit 6, the common part of the dedicated modulation circuit for each communication mode is integrated into one modulation circuit 61, and the common part of the dedicated demodulation circuit for each communication mode is integrated into one demodulation circuit 62. It is. Further, the signal processing circuit 6 is provided with a parameter circuit 63 that receives parameter information from the control circuit 7 and supplies the parameter information to the modulation circuit 61 and the demodulation circuit 62.
[0021]
The modulation circuit 61 performs modulation processing on the input transmission data at a transmission data rate according to the parameter information from the parameter circuit 63. Further, the demodulation circuit 62 performs demodulation processing on the input digital baseband signal at a reception data rate according to the parameter information from the parameter circuit 63.
[0022]
The processing operation of the above configuration will be described below.
First, in a communication signal corresponding to each service, a plurality of modes are defined by parameters for each of the modulation scheme, transmission frequency, reception frequency, transmission data rate, reception data rate, transmission filter coefficient, and reception filter coefficient.
[0023]
When an ETC use request is input from the operation unit 9, the control circuit 7 reads out corresponding parameter information from the memory 8 and outputs this parameter information to the signal processing circuit 6. This parameter information includes information indicating the transmission frequency ft1, reception frequency fr1, transmission data rate a1, reception data rate b1, modulation method X, transmission filter coefficient c1, and reception filter coefficient d1 of the ETC signal.
[0024]
When receiving the parameter information, the signal processing circuit 6 sets the parameter information in the modulation circuit 61 and the demodulation circuit 62 and executes the modulation process and the demodulation process in a mode corresponding to the parameter information.
[0025]
On the other hand, when switching to the FM radio occurs in the ETC execution state, the control circuit 7 reads out parameter information corresponding to the FM radio to be switched from the memory 8 and outputs the parameter information to the signal processing circuit 6. The parameter information of the switching destination includes information indicating the reception frequency fr2, the reception data rate b2, the modulation method Y, and the reception filter coefficient d2 of the FM radio signal.
[0026]
When the signal processing circuit 6 receives the parameter information corresponding to the switching destination, the signal processing circuit 6 updates the parameter information already set in the demodulation circuit 62 to the switching destination parameter information, and performs a demodulation process in a mode according to the updated parameter information. Is executed. That is, the parameter information set in the demodulation circuit 62 includes the reception frequencies “fr1” to “fr2”, the reception data rates “b1” to “b2”, the modulation schemes “X” to “Y”, and the reception filter coefficient “d1”. To “d2”.
[0027]
As described above, in the above-described embodiment, the signal processing circuit 6 extracts a common part from a plurality of modulation / demodulation circuits having different communication modes, and separately provides different parts depending on the communication mode, and parameter information corresponding to the communication mode. When the desired communication mode is executed, the control circuit 7 reads out parameter information corresponding to the communication mode from the memory 8, and this parameter information is By being set in the signal processing circuit 6, processing in an arbitrary communication mode is executed.
[0028]
Accordingly, it is not necessary to incorporate a dedicated signal processing circuit corresponding to each mode, so that the size and cost can be reduced correspondingly, and the control circuit 7 is connected to the signal processing circuit 6 in the communication mode switching process. On the other hand, it is only necessary to transmit parameter information corresponding to the communication mode, which makes it possible to change the mode more easily and in a shorter time than when circuit information for realizing an arbitrary communication mode is set. Furthermore, transmission of only parameter information is more effective for concealing the internal information of the circuit than when transmitting the entire circuit information.
[0029]
In the above embodiment, in the signal processing circuit 6, the common part of the dedicated modulation circuit for each communication mode is integrated into one modulation circuit 61, and the common part of the dedicated demodulation circuit for each communication mode is demodulated into one demodulator. Integration in the circuit 62 and setting of parameter information corresponding to the communication mode in the modulation circuit 61 and the demodulation circuit 62 enables modulation and demodulation in any communication mode, thereby reducing the size and consumption of the entire apparatus. Electricity can be achieved.
[0030]
Further, even if a broadcasting / communication service requesting a new communication mode appears in the future, it can be easily handled by simply registering the corresponding parameter information in the memory 8.
[0031]
In addition, this invention is not limited to the range of the said embodiment. For example, in the above embodiment, an example has been described in which a communication signal in which a plurality of modes are defined by parameters for each of the modulation method, transmission frequency, reception frequency, transmission data rate, reception data rate, transmission filter coefficient, and reception filter coefficient has been described. However, in addition to the modulation method, transmission frequency, reception frequency, transmission data rate, reception data rate, transmission filter coefficient, and reception filter coefficient, a communication signal in which a plurality of modes are defined may be handled. In this case, the mode can be changed only by changing the parameter designation.
[0032]
Further, in the above-described embodiment, the example in which the signal processing circuit 6 includes the modulation circuit 61, the demodulation circuit 62, and the parameter input circuit 63 has been described. However, a signal processing circuit other than the modulation circuit 61 and the demodulation circuit 62 is used. It may be.
[0033]
In addition, the configuration and type of the communication device, the type of parameters, the configuration of the signal processing circuit, the type of service, and the like can be implemented with various modifications without departing from the scope of the present invention.
[0034]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to flexibly process a plurality of communication signals having different modes, and it is possible to realize downsizing, cost reduction and power consumption. A communication device can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a communication apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a specific configuration of the signal processing circuit shown in FIG. 1;
[Explanation of symbols]
1 ... Antenna for ETC,
2 ... FM / AM radio antenna,
3 ... GPS antenna,
4 ... wireless circuit,
5 ... A / D (analog / digital) conversion circuit,
6 ... Signal processing circuit,
7: Control circuit,
8 ... Memory,
9 ... operation part,
61. Modulation circuit,
62 ... demodulator circuit,
63: Parameter circuit.

Claims (2)

Based on the circuit information set in the signal processing unit, circuit information in an arbitrary communication mode is selectively set in the signal processing unit from among a plurality of circuit information for realizing signal processing circuits having different communication modes. A communication device that realizes a signal processing circuit in a communication mode selected by processing a communication signal,
One common circuit in which common parts of a plurality of signal processing circuits realized by the circuit information are integrated, and a different part depending on the communication mode of the plurality of signal processing circuits realized by the circuit information are selected. An input circuit for inputting parameter information that is effective for concealing the internal information of the circuit as compared to the circuit information and that specifies processing contents of communication signals that differ depending on the communication mode, and the parameter information is selectively set A communication signal processing unit that inputs the communication signal and executes signal processing according to the set parameter information;
A parameter information storage unit for storing the parameter information for each communication mode;
Depending on the required communication mode, the parameter information is selectively read from the parameter information storage unit, the parameter information is set in the communication signal processing unit, and the parameter information set in the communication signal processing unit A communication apparatus comprising: a control unit that processes a communication signal.   2. The communication apparatus according to claim 1, wherein the parameter information specifies at least one of a modulation method, a transmission frequency, a reception frequency, a transmission data rate, a reception data rate, a transmission filter coefficient, and a reception filter coefficient.

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