JPS6093829A - Information contents identifying device of on-vehicle receiver - Google Patents

Abstract

PURPOSE:To select easily the channel of each broadcasting station by displaying identified results of information contents of received radio waves with visible patterns indicating information contents. CONSTITUTION:Sound signals obtained by detection of received signals in a tuner 1 are subjected to frequency analysis through a changeover switch by a filter circuit 3 and are sampled in time division successively by a multiplexer 4. Signals obtained in a feature extracting circuit 2 consisting of the filter 3 and the multiplexer 4 are sent to a CPU 6 through an A/D converter 5 and an interface 7, and information contents are decided by the CPU 6. In this case, plural standard signal patterns corresponding to various information contents such as music, news, etc. and their visible patterns are stored preliminarily in an ROM 10, and frequencies of broadcasting stations are stored preliminarily in an RAM 11, and information in these ROM 10 and RAM 11 are used for decision. As the decided result, said visible pattern corresponding to required display data is outputted to a CRT monitor 15 through an output interface 13 and a video generator 14.

Description

[Detailed description of the invention] The present invention relates to an information content identification device for a vehicle-mounted receiver.

The information content identification device is a device that identifies the information content of radio waves that can be received or received by an on-vehicle receiver and announces the identification result by display or the like.

In such an information content identification device, it is desirable for the driver to be able to instantly see the identification result on the display for safe driving.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information content identification device for an on-vehicle receiver that can instantly determine identification results.

The information content identification device of the present invention is characterized by having a display means for displaying a visible pattern representing the information content in accordance with the identification result.

Embodiments of the present invention will be described below with reference to the drawings.

In the information content identification device which is an embodiment of the present invention shown in FIG. 1, a received signal is detected by a tuner 1 of a digital synthesizer type of an on-vehicle receiver, and the obtained audio signal is subjected to feature extraction via a changeover switch SW. Supplied to circuit 2. The feature extraction circuit 2 includes a filter circuit 3 consisting of a plurality of BPFs (band pass filters) connected to the output of the tuner 1, and a multiplexer 4.The output of the filter circuit 3 is The multiplexer 4 sequentially samples the signals in a time-division manner.

The output of the feature extraction circuit 2 is supplied to an input interface 7 of the CPU 6 via an A/D (analog/digital) converter 5. Further, the intermediate frequency amplification section of the tuner 1 is connected to the input interface 7 via the rectifier circuit 8 and the A/D converter 9, and the signal strength of the received radio waves is detected.

The CPU 6 has ROM (read only memory) 10,
A RAM (random access memory) 11 and a clock generator 12 are connected. Further, a video generator 14 is connected to the output interface 13 of the CPU 6, and an output signal of the video generator 14 is supplied to a CRT (cathode ray tube) monitor 15 as a video signal. The output interface 10 is also connected to a tuning section of the tuner 1 consisting of a PLL circuit. Furthermore, a synchronizing signal and a blanking signal are supplied to the video generator 14 from a control signal generating circuit 16.

Note that the ROM 10 stores in advance a plurality of standard signal patterns and their visible patterns corresponding to each information content such as music and news. Furthermore, the frequencies of a plurality of receivable broadcast stations can be stored in advance in the RAM II by the driver, etc., and the stored contents are retained even after the on-vehicle receiver stops operating. Further, the switch SW is activated when an information content display command is generated by the present device, and relays the output audio signal of the tuner 1 to the filter circuit 3.

In such a configuration, the output audio signal of the tuner 1 is normally supplied to the amplifier 17 via the switch SW, and the speaker 18 is driven. When the switch SW is activated, the output audio signal of the tuner 1 is supplied to a predetermined number of filter circuits 3, for example, 8 BPFs in different frequency bands, and the multiplexer 4 scans the output signals of each BPF at a predetermined period and sends them to the A/D. It is supplied to converter 5. A/D converter 5
converts the output signal of the multiplexer 4 into a digital signal and supplies it to the input interface 7.

Further, the intermediate frequency signal of the intermediate frequency amplifying section of the tuner 1 is rectified by the rectifier circuit 8, and the rectified voltage □ is the A/D
The converter 9 supplies the input interface 7 as a digital signal representing the signal strength of the received radio waves. C
For example, when the power supply voltage is applied to the in-vehicle receiver, the PU 6 supplies display data consisting of predetermined bits to the output interface 13 by an operation described below. The display data is parallel-serial converted by the output interface 13 and supplied to the video generator 14. The video generator 14 generates a video signal by combining display serial data with a blanking signal and a synchronization signal, and supplies the video signal to the CRT monitor 15. Further, the reception frequency of the tuner 1 changes depending on the digital signal supplied from the output interface 13 to the tuning section of the tuner 1.

Next, the operation of the CPLI 6 will be explained according to the flowchart shown in FIG.

First, the CPU 6 determines from the state of the switch SW whether or not a command to display information content has been issued (step 31).

When a display command occurs, the RAM 11 is
For example, the reception frequency data is selectively read out from among the plurality of reception frequency data preset in the lower frequencies, and the read reception frequency data is supplied to the output interface 13 to set the reception frequency 5 of the tuner 1. − is set (step 32). Once the receiving frequency of the tuner 1 is determined in this way, the received radio field strength Sg supplied from the A/D converter 9 to the input interface 7 is read and stored in the RAM II (step 33), and the received radio field strength SO is determined as follows.

It is determined whether the strength is greater than a predetermined strength SO (step 34). If Sg≧SO, n=1 (step 35) From the A/D converter 5 to the input interface 7
A digital signal representing the frequency analysis result of the audio signal supplied to the computer is read and an input signal pattern is created (step 36). Next, a single standard signal pattern is read out in a predetermined order from the nA standard signal patterns stored in the ROM 10 (step 37), and a matching calculation between the input signal pattern and the standard signal pattern, that is, similarity PO is performed.
is calculated (step 38). Then n = n
A, that is, whether matching calculations between nA standard signal patterns and the input signal pattern have been performed (step 39).

In the case of n + n A, add 1 to n and proceed to step 36.
17 and cover (step 40). If n = n A, nA similarities P1 excluded in step 38
. . . The maximum value PMAX is detected from pn (step 41), and it is determined whether the maximum &i7PMxx is greater than the predetermined value Pr (step 42). PMAX≧
If the information content is identified from the audio signal, the visible pattern of the information content corresponding to the standard signal pattern with the maximum value PMAX is read out from the ROM 10 (pattern 43), and the received data stored in the RAM 11 is read out. The radio wave intensity SO is read out and display data is formed together with the display pattern (step 44).The display data is then stored in the RAM 11 and output interface 1.
0 to display the information content (step 45). In addition, if the information content display command has not occurred, 3g
In the case of <3o and in the case of PMA×<Pr, the execution of the subsequent steps is omitted. Further, the CPU 6 repeats the above-described operations to form display data including the received radio wave intensities of the preset receiving frequencies and visible patterns of information contents.

Therefore, as shown in FIG. 3, the signal strength of each received radio wave is displayed as a bar graph for each reception frequency on the CRT monitor 15, and above the signal strength, the information content is displayed as pictograms. Pictogram a represents music, pictogram S represents traffic information, and pictogram C represents Nikos.

In the above embodiment, the information content of the received radio wave was identified by the signal pattern of the audio signal, but if the radio wave contains a pilot signal representing the information content, the pilot signal is detected and the information content is identified. It is also possible to identify.

As described above, according to the information content identification device of the present invention, since the identification result of the information content of the received radio wave is displayed by the visible pattern representing the information content, it is possible to instantly identify the information content, that is, to easily understand the information content and select a channel. becomes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow diagram showing the operation of the CPU in the device shown in FIG. 1, and FIG. 3 is a diagram showing the display state of the device shown in FIG. 1. . Explanation of symbols of main parts 1...Tuner 2...Feature extraction circuit 5.9...A/D converter 6...CPU 7... ... Input interface 13 ... Output interface 14 ...
・Video generator 15... CRT monitor applicant Honda Motor Co., Ltd. agent Patent attorney Motohiko Fujimura 9-

Claims (1)

[Claims] Information characterized by comprising: an identification means that identifies the information content of radio waves received by an on-vehicle receiver and generates an identification signal; and a display means that displays a visible pattern representing the information content in accordance with the identification signal. Content identification device.