JPH0330331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a signal strength indicating device for indicating the signal strength of a receiver.

(Prior Art) A radio receiver is equipped with a signal strength indicator to determine the strength of a received signal. FIG. 3 shows an example of the configuration of a conventional receiver. 1 is an antenna, 2 is a high frequency amplifier circuit, 3 is a mixer circuit,
is an intermediate frequency amplification circuit, 5 is an audio detection circuit, and 6 is an intermediate frequency amplification circuit.
An AGC detection circuit, 7 a reception frequency setter, 8 a local oscillation circuit, and 9 an indicator, which includes a light-emitting indicator in addition to a pointer-type meter. As shown in FIG. 3, in the conventional receiver, the output voltage of the AGC detection circuit 6 is applied to the indicator 9 with the same characteristics of the receiver.

(Problem to be solved by the invention) However, the output of the AGC detection circuit 6 includes the effects of the characteristics (frequency characteristics, amplification factor, etc.) of the elements that make up the receiver. For example, the signal strength is constant. However, the disadvantage is that the indicated value varies depending on the receiving frequency.Also, the scale of the indicator is not uniform, making it difficult to read.For these reasons, conventional indicators are used as a simple guide. It was nothing more than a simple thing.

(Means for Solving the Problems) In order to solve these drawbacks, the present invention calculates the difference in the AGC detection output voltage due to the difference in the characteristics of the elements constituting the receiver by analyzing the frequency characteristics and input/output characteristics of each receiver. Measure in advance and write the results to the frequency characteristic data memory and input/output characteristic data memory, and also set the correction value to correct the unevenness of the scale of the indicator, the correction value to perform logarithmic (decibel) indication, etc. to the scale. Write it to the correction data memory,
This corrects the output voltage of the AGC detection circuit and sends an indication to the indicator. FIG. 1 is a block diagram showing the configuration of essential parts of the present invention. 6,7,9
1 indicates the same or corresponding parts as the same reference numerals in FIG. 3 of the conventional example, 10 is an instruction mode setter, 11 is an A/D conversion circuit, 12 is a frequency characteristic data memory, 13 is an input/output characteristic data memory, 14 15 is a frequency data selection circuit, 15 is a frequency characteristic correction circuit,
16 is an input/output data selection circuit, 17 is a scale correction data selection circuit, 18 is a voltage correction circuit, 19 is a command voltage processing circuit, and 20 is a scale correction data memory.

(Embodiment) FIG. 2 shows a block diagram of an embodiment of the present invention when the block diagram of FIG. 1 is used. In the figure, 6, 7, 9, 10, 11, 12, 13, and 20 indicate the same or corresponding parts as the same reference numerals in FIGS. 1 and 3, 21 is a program memory, and 22 is a microcomputer. However, peripheral devices such as the input/output interface of the microcomputer 22 are omitted, and the data line of the memory,
Address lines and the like are shown in a simplified manner.

(Function) In FIG. 1, the output voltage of the AGC detection circuit 6 is converted into a digital value by the A/D converter 11. The frequency data selection circuit 14 reads the corresponding data from the frequency characteristic data memory 12 based on the information from the receiving frequency setter 7, and the frequency characteristic correction circuit 15 reads out the digital output voltage (hereinafter referred to as instruction voltage) from the A/D conversion circuit 11. ) to eliminate differences in signal strength indication values depending on reception frequency. Next, the input/output data selection circuit 16 reads corresponding data from the input/output characteristic data memory 13 in comparison with the frequency characteristic corrected instruction voltage from the frequency characteristic correction circuit 15, and furthermore, the correction data selection circuit 17 reads out the specified data from the input/output characteristic data memory 13. Uncorrected scale, linear scale, logarithmic scale,
Based on selection information such as a partially enlarged scale, the corresponding data is read from the scale correction data memory 20, and the voltage correction circuit 18 corrects the indicated voltage. In the command voltage processing circuit 19, the command values per time, such as average values and peak values, are corrected. Selection of this instruction mode is also performed by the instruction mode setter 10. The signal strength is indicated by the indicator, but if the indicator is a pointer-type meter, a D/A conversion circuit is naturally required, and it is necessarily included in the indicator 9 and is not particularly shown. do not have.

The embodiment shown in FIG. 2 includes a program memory 21 and a microcomputer 22, and includes a frequency characteristic selection circuit 14, a frequency characteristic correction circuit 15, an input/output data selection circuit 16, and a correction data selection circuit 1 shown in FIG.
7. The voltage correction circuit 18 and the command voltage processing circuit 19 are constructed, and the processing procedures performed by each circuit are stored as a program in the program memory 21, and the same functions as described above are achieved.

(Effects of the Invention) As explained above, by providing means for correcting the signal strength indication value based on data on the frequency characteristics and input/output characteristics of the receiver that have been measured and written in the memory in advance, the indication The value can be accurate regardless of the receiving frequency, and it is also possible to specify linear, logarithmic, partial expansion, etc., which has the advantage of improving the performance and functionality of the receiver.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of essential parts of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing an example of the configuration of a conventional receiver. 6...AGC detection circuit, 7...Reception frequency setter, 9...Indicator, 10...Indication mode setter,
11... A/D conversion circuit, 12... Frequency characteristic data memory, 13... Input/output characteristic data memory,
14... Frequency data selection circuit, 15... Frequency characteristic correction circuit, 16... Input/output data selection circuit,
17... Correction data selection circuit, 18... Voltage correction circuit, 19... Instruction voltage processing circuit, 20... Scale correction data memory, 21... Program memory,
22...Microcomputer.

Claims (1)

[Claims] 1. A signal strength indicating device for a receiver, which includes a frequency characteristic data memory in which the frequency characteristics of the receiver are stored in advance, and an input/output characteristic data memory in which the input/output characteristics of the receiver are stored in advance. and a scale correction data memory for storing data for correcting the indication value of the signal strength indicator in any indication mode, and a frequency for selecting and reading out data from the frequency characteristic data memory according to received frequency information. data selection means and receiver AGC based on the selected data;
a frequency characteristic correction means for correcting the detection output voltage;
input/output data selection means for selecting and reading out data from the input/output characteristic data memory in comparison with the corrected voltage; A receiver comprising: correction data selection means for selecting and reading data from a correction data memory; and voltage correction means for correcting the output voltage of the frequency characteristic correction means based on the selected scale correction data. Aircraft signal strength indicator. 2. The signal strength indicating device for a receiver according to claim 1, further comprising an indicating voltage processing means for processing the indicated value per time of the signal strength indicator.