JP2585062Y2 - Radio data system simulator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a radio data system which is used for checking the performance of a radio data system tuner by simulating a radio data system broadcast wave in a situation of being received while driving a car. Related to simulators.

[0002]

2. Description of the Related Art In a conventional radio data system simulator, a plurality of radio data system signal generators and FM signal generators are used, and the radio data system broadcast radio waves are simulated by manually switching sequentially. .

[0003]

However, in the above-described conventional radio data system simulator, switching between the signal generator and the FM signal generator of the radio data system is manual and has a time limit in switching time. In addition to the problem of inefficiency, there is another problem that it is not possible to simulate a severe disturbance of the electric field generated while the vehicle is running.

An object of the present invention is to provide a radio data system simulator capable of simulating a signal having a level close to an actual broadcast reception state by simulating a disturbance of an electric field as well as shortening a switching time. .

[0005]

SUMMARY OF THE INVENTION A radio data system simulator according to the present invention is a radio data system simulator which generates a designated data in a radio data system and superimposes a signal from the signal source and outputs the data. A generator, a carrier generator for generating a carrier having a specified frequency and level, an FM modulator for FM-modulating a carrier output from the carrier generator with a signal output from a radio data system data generator, A fading device that changes the level of the output from the modulator to a fading state, a multipath device that changes the level of the output from the FM modulator to a multipath condition, and the level of the output from the FM modulator to a multipath condition And one of a fading and multi-path imparting device for changing to a fading state. A plurality of pseudo radio data system broadcasting stations; a synthesizer for synthesizing outputs from the plurality of pseudo radio data system broadcasting stations; and a radio data system data specifying a frequency and a level of a carrier outputted from the carrier generator. Designating means for designating data output from the generator, wherein the output of the synthesizer is output to the test receiver.

[0006]

According to the radio data system simulator of the present invention, a carrier having a frequency and a level designated by the designating means is FM-modulated by a superposition signal of a signal from a signal source and data designated by the designating means, and the FM modulation output is provided. Output of which the level of the signal is changed to the fading state, FM
An output in which the level of the modulation output is changed to the multipath state, or an output in which the level is changed to the multipath state and the fading state is output from each pseudo radio data system broadcasting station, and the outputs are combined and output. . This combined output is in a state similar to the state of the radio waves received by the test receiver running in the car, simulating the disturbance of the electric field, etc., and the test receiver is a signal close to the actual broadcast reception state Will be tested. Therefore,
A test receiver is equivalent to being tested while driving in a car. Further, the carrier frequency,
The level and data can be changed, and the switching time is shortened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG.
FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

The output from the CD player 1 for outputting the broadcast contents is supplied to a radio data system (hereinafter, referred to as RDS) data generator 2, where the output signal from the CD player 1 and the RDS data are superimposed. The output from the RDS data generator 2 is supplied to a carrier generator and an FM modulator 3,
The output from the carrier generator and modulator 3 is M-modulated and supplied to a multipath and fading imparting device 4 to generate an FM modulation output whose level has been changed to a multipath state and a fading state. By these, the first
The pseudo RDS broadcasting station A is configured.

Similarly, an FM whose level has been changed to a multipath state and a fading state by a CD player 5, an RDS data generator 6, a carrier generator, an FM modulator 7, and a multipath and fading imparting device 8. A second pseudo RDS broadcasting station B that generates a modulation output is configured.

Similarly, the level is changed to a multipath state and a fading state by the CD player 5, the RDS data generator 6, the carrier generator, the FM modulator 10, and the multipath and fading imparting device 11. The third pseudo RDS broadcasting station C that generates the FM modulation output is configured.

The FM modulation output output from each of the first, second, and third pseudo RDS broadcast stations A, B, and C is supplied to a synthesizer 9 and synthesized and output. The output from the synthesizer 9 is received by the test receiver 12.

Here, under the control of the microcomputer 13, the RDS data generators 2 and 6 output the RDS commanded via the output device of the microcomputer 13.
Controlled by RDS data corresponding to the data information,
The carrier generator and the FM modulators 3, 7, and 10 control the carrier frequency and the level corresponding to the carrier frequency information and the level information specified through the input device of the microcomputer 13 based on the signal from the microcomputer 13. Is done. The microcomputer may be a personal computer.

The operation of the embodiment constructed as described above will be described with reference to the flowchart of FIG.

An instruction for a simulation operation is issued.
As an example of this instruction, a case where a simulation operation in which a receiving station moves to an alternative broadcasting station is instructed will be described as an example. Initial setting is performed following the instruction of the simulation operation (step S1). Initially, the carrier frequency information and the antenna output information are transmitted from the microcomputer 13 to the carrier generator and the FM modulators 3, 7, and 10 as well.
DS information is output to RDS data generators 2 and 6.

For example, for the first pseudo broadcast station A, the frequency is set to 90 MHz and the antenna output level is set to 60d.
Bμ, PI code (program recognition code) C202, AF code (alternate frequency code) 91 MHz, 92 MHz, frequency 91 MHz, antenna output level 60 dBμ, PI code C202, AF code 90 MHz, 92 MHz for second pseudo broadcast station B , For the second pseudo broadcast station C, the frequency is 92 MHz, and the antenna output level is 60 dB.
μ, PI code C202, AF code 91 MHz, 90
MHz.

Based on these settings, the microcomputer 13 sends the RDS data generator 2, carrier wave generator and FM modulator 3 via the bus to the RDS data generator 6, carrier wave generator and FM modulator 7, Data is transmitted to the data generator 2, the carrier generator and the FM modulator 10. Upon receiving this information data, the RDS data generator 2, carrier wave generator and FM modulator 3, RD
S data generator 6, carrier generator and FM modulator 7,
The RDS data generator 2, the carrier generator and the FM modulator 10 are operated in a state corresponding to the transmitted data, are combined by the combiner 9, and are transmitted to the test receiver 12.

Next, tune the test receiver 12 to 90 MHz. Set the fading device to $ xx
x} is the multipath and fading adder
Set to y〃. CD player 〃playing state〃
Is displayed (step S2).

In accordance with the display in step S2, the fading devices 4 and 11 are operated by the user to indicate the indicated value Δx.
xx}, and the multipath and fading imparting device 8 is set to the indicated value {yyy}. In addition, the test receiver 12 operates at 90 MHz according to the display.
Tuned to When the setting is completed, the process waits for the user to input a setting end signal (step S).
3). The set peripheral force signal is made by inputting from an input device.

When it is determined that the setting end signal has been input, the simulation operation is started (step S).
4). By this operation, the display of YES or NO for knowing whether or not the carrier of 90 MHz has been received is performed. When receiving the message, the user receives YES
Enter Next, the microcomputer 13 sets the antenna output of the first pseudo broadcast station A to 10 dBμ.

With this setting, the test receiver 12 receiving the signal of the first pseudo broadcast station A detects that the reception state of the broadcast from the first pseudo broadcast station A has deteriorated. If the test receiver 12 is normal following the detection, the receiving station moves to the reception of the second pseudo broadcast station B or the third pseudo broadcast station C. This movement is automatically switched to the reception frequency of 91 MHz according to the AF data.

When the antenna output of the first pseudo broadcast station A is 10d
When it is set to Bμ, a display of YES or NO is made. Here, the user inputs YES when receiving 91 MHz, and inputs NO when receiving is not possible (step S5). The microcomputer 13 determines whether or not the receiving broadcast station has been moved to the alternative broadcasting station by this input.

When YES is input in step S5, the simulation operation waits for an end instruction (step S6). When the end instruction is issued, a test result is displayed on a screen and printed on a printer. (Step S7), the simulation operation ends.

If NO is input in step S5, a screen for waiting for an instruction as to whether or not to retest is displayed.
When a retest instruction is issued, the process is executed again from step S1 (step S8). When an instruction not to perform the retest is issued in step S8, step S6 is executed.
If the processing is not completed in step S6, the processing is executed again from step S1 to execute the next test.

Further, it is also possible to change the state of multipath and fading to perform resimulation.

In the above description, the case where the receiving station instructs the simulation operation to move to the alternative broadcasting station when the PI code is the same at broadcasting stations A, B and C has been described. When the PI code is partially changed in B and C and the operation moves to the reception of the alternative broadcast station, the coincidence of the PI code is detected. If the PI code does not match, the reception station immediately moves to the reception of the next alternative broadcast station. It is a matter of course that another simulation operation can be designated, such as checking whether or not to perform, and the designated other simulation operation can be performed.

In the above description, the pseudo RDS broadcast station is 3
Although the case of a station has been exemplified, the station need not be three but may be a plurality of stations. Also, in the above description, the pseudo RDS broadcast station 3
Although the case where the station is provided with the multipath and fading imparting device is illustrated, the fading imparting device, the multipath imparting device, or the multipath and fading imparting device may be provided in each pseudo broadcasting station.

[0027]

As described above, according to the present invention, a carrier having a frequency and a level designated by a designating means is FM-modulated with a superimposed signal of a signal from a signal source and data designated by the designating means, and FM An output in which the level of the modulation output is changed to a fading state, an output changed to a multipath state, or an output changed to a multipath state and a fading state is output from each pseudo radio data system broadcasting station, Since the outputs are combined and output, the combined output has the effect of being in the same state as the state of the radio waves received by the test receiver running in the car. Therefore, the disturbance of the electric field is also simulated, and the test receiver is tested with a signal close to the actual broadcast reception state. This is equivalent to the test receiver being tested in a state of traveling in a car. There is an effect.

Further, the carrier frequency, the level and the data can be changed, so that the switching time is shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention;

[Explanation of symbols]

1 and 5 CD players 2 and 6 RDS data generators 3, 7, and 10 Carrier generators and FM modulators 4, 8, and 11 Multipath and fading adders 9 Combiners 12 Test receivers 13 Microcomputers A, B, and C First, second and third pseudo RDS broadcasting stations

Claims (1)

(57) [Scope of request for utility model registration] 1. A signal source, a radio data system data generator for generating specified data in a radio data system and superimposing and outputting a signal from the signal source, and a carrier having a specified frequency and level. A carrier generator to be generated, an FM modulator for FM-modulating a carrier output from the carrier generator with a signal output from the radio data system data generator, and changing the level of the output from the FM modulator to a fading state. Fading device and F
Either a multipath adder that changes the level of the output from the M modulator to a multipath state or a fading and multipath adder that changes the level of the output from the FM modulator to a multipath state and a fading state A plurality of pseudo radio data system broadcasting stations comprising: a synthesizer for synthesizing outputs from the plurality of pseudo radio data system broadcasting stations; and specifying a frequency and a level of a carrier output from the carrier generator; and Means for designating data output from a radio data system data generator, wherein the output of the synthesizer is output to a test receiver.