JPH0821872B2 - In-vehicle receiver information content identification device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an information content identification device for an in-vehicle receiver.

[0002]

2. Description of the Related Art An information content identification device is a device that identifies the information content of a radio wave that can be received by or is received by an in-vehicle receiver and notifies the identification result by display or the like. In such an information content identification device, it is desirable for safe driving of the driver that the identification result can be instantly understood by the display and the tuning can be easily performed.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information content identification device for an on-vehicle receiver which can instantly understand the identification result of the information content of the received radio wave and facilitate the tuning.

[0004]

The information content identifying device for an in-vehicle receiver according to the present invention comprises a reception control means for changing the reception frequency of the in-vehicle receiver for receiving a radio wave, and an identification signal for identifying the information content of the received radio wave. Generating means, a storage means that stores in advance a visible pattern for each of a plurality of different information contents as data, a means that reads the corresponding visible pattern from the storage means according to the identification signal, and detects the intensity of the received radio wave. It is characterized by comprising intensity detection means and display means for displaying the intensity obtained by the intensity detection means and also for displaying the read visible pattern.

[0005]

In the in-vehicle receiver information content identifying apparatus of the present invention, when the reception frequency of the in-vehicle receiver is changed and the radio wave is received, the information content of the received radio wave is identified and the identification result is shown. An identification signal is generated and a visible pattern corresponding to the identification signal is read from the storage means. On the other hand, the intensity of the received radio wave is detected by the intensity detection means, and the detected intensity of the received radio wave and the read visible pattern are displayed by the display means. Therefore, the signal strength is instantly known together with the information content of the received radio wave, and the tuning becomes easy.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the information content identifying apparatus as one embodiment of the present invention shown in FIG. 1, a voice signal obtained by detecting a received signal by a digital synthesizer type tuner 1 of an in-vehicle receiver is obtained by a feature extraction circuit via a changeover switch SW. 2 is supplied. The feature extraction circuit 2 includes a filter circuit 3 including 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 sequentially sampled in a time division manner by the multiplexer 4 in order to analyze the frequency of the voice signal. The output of the feature extraction circuit 2 is supplied to the input interface 7 of the CPU 6 via the A / D (analog / digital) converter 5. The intermediate frequency amplifier of the tuner 1 is connected to the input interface 7 via the rectifier circuit 8 and the A / D converter 9 to detect the signal strength of the received radio wave.

The CPU 6 has a ROM (read only memory) 10 and a RAM (random access memory) 1
1 and the clock generator 12 are connected. Also CP
A video generator 14 is connected to the output interface 13 of U6, and the 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 the PL of the tuner 1.
It is also connected to the tuning unit consisting of an L circuit. Further, the synchronizing signal and the blanking signal are supplied from the control signal generating circuit 16 to the video generator 14.

The ROM 10 stores a plurality of patterns of standard signals corresponding to information contents such as music and news and their visible patterns in advance as data. Further, the RAM 11 is capable of preliminarily storing the frequencies of a plurality of receivable broadcasting stations by a user such as a driver and retaining the stored contents even after the operation of the in-vehicle receiver is stopped. Further, the switch SW operates 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 actuated, the output audio signal of the tuner 1 is supplied to a predetermined number of filter circuits 3, for example, eight BPFs of different frequency bands, and the multiplexer 4 scans the output signal of each BPF at a predetermined cycle to perform A / D conversion. It is supplied to the converter 5. A
The / 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 amplification section of the tuner 1 is rectified by the rectifier circuit 8, and the rectified voltage is supplied to the input interface 7 by the A / D converter 9 as a digital signal representing the signal strength of the received radio wave. CPU
For example, 6 supplies display data consisting of predetermined bits to the output interface 13 by an operation described later when a power supply voltage is applied to the vehicle-mounted receiver. The display data is supplied by the output interface 13 to the video generator 14 which has been converted from parallel to serial. The video generator 14 generates a video signal by synthesizing the blanking signal and the synchronizing signal with the display serial data and supplies the video signal to the CRT monitor 15. Further, the reception frequency of the tuner 1 changes according to the digital signal supplied from the output interface 13 to the tuning section of the tuner 1.

Next, the operation of the CPU 6 will be described with reference to the flowchart of FIG. First, the CPU 6 determines from the state of the switch SW whether or not a display command for information content has been issued (step 31). When a display command is issued, the reception frequency data is selectively selected from a plurality of reception frequency data preset in the RAM 11 by the user, for example, a low frequency, and is read, and the read reception frequency data is output as an interface. It is supplied to 13 to set the reception frequency of the tuner 1 (step 32).
When the reception frequency of the tuner 1 is determined in this way, next, A
The received radio wave Sg supplied from the D / D converter 9 to the input interface 7 is read and stored in the RAM 11 (step 33), and the received radio wave intensity Sg is the predetermined intensity S.
It is determined whether it is greater than o (step 34). S
If g ≧ So, then n = 1 (step 35), A
A digital signal representing the frequency analysis result of the audio signal supplied from the / D converter 5 to the input interface 7 is read to create an input signal pattern (step 36).
Then, a single standard signal pattern is read out from the A standard signal patterns stored in the ROM 10 in a predetermined order (step 37), and the matching calculation between the input signal pattern and the standard signal pattern, that is, the similarity Pn is calculated ( Step 38). Then, it is determined whether or not n = A, that is, whether or not the matching calculation of the A standard signal patterns and the input signal pattern is performed (step 3).
9). If n ≠ A, 1 is added to n and step 37 is performed.
(Step 40). When n = A, the maximum value PMAX is detected from the A similarity degrees P1 ... Pn calculated in step 38 (step 41), and the maximum value PM is calculated.
It is determined whether AX is larger than the predetermined value Pr (step 42). If PMAX ≧ Pr, the ROM 1 is a visible pattern of information content corresponding to the standard signal pattern having the maximum value PMAX assuming that the information content is identified from the voice signal.
0 is read (pattern 43), and the received electric wave intensity Sg stored in the RAM 11 is read to form display data together with the visible pattern (step 44). And
The display data is stored in the RAM 11 and is supplied to the output interface 10 to display the information content in the CRT monitor 1.
5 is displayed (step 45). In addition, when the display command of the information contents is not generated, when Sg <So, and P
When MAX <Pr, the CPU 6 omits the execution of the subsequent steps and ends the processing once. Further, the CPU 6 forms display data including a visible pattern of received radio wave intensity and information content of each preset reception frequency by repeating the above operation. In the display data formed here, for example, a storage position corresponding to each predetermined display device on the CRT monitor 15 is provided in the RAM 11, and from the storage position determined according to the frequency of the received radio wave. The digital data of the storage position corresponding to the intensity is changed from 0 to 1 in the storage position direction corresponding to the vertical direction on the CRT monitor 15, and the digital data of the storage position is changed according to the visible pattern.

Therefore, as shown in FIG. 3, the signal intensity of each received radio wave is displayed on the CRT monitor 15 at the position of the receiving frequency as a bar graph, and the contents above the signal intensity are displayed as pictorial symbols. Pictogram a is music, pictogram b
Indicates traffic information, and the pictogram c indicates news. Although the information content of the received radio wave is identified by the signal pattern of the voice signal in the above-described embodiment, the information content may be identified by the radio wave.

In the above embodiment, the signal strength of the received radio wave is displayed as a bar graph for each reception frequency, but the present invention is not limited to this. Signal strength can be
You can display numbers.

[0013]

As described above, according to the information content identifying apparatus of the present invention, the information content of the received radio wave is identified, the intensity of the received radio wave is detected, the intensity of the received radio wave is displayed, and the identified information content is displayed. Since the visible pattern shown is displayed, the information content of each received radio wave can be instantly understood and the tuning becomes easy.
In particular, if a plurality of received radio waves have the same type of information content, for example, music, it is possible to easily select and receive one having a higher intensity.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation of a CPU in the apparatus shown in FIG.

FIG. 3 is a diagram showing a display state of the apparatus of FIG.

[Explanation of symbols for 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

 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-55-74271 (JP, A) JP-A-57-32122 (JP, A) JP-A-49-108906 (JP, A) JP-A-54- 145401 (JP, A) JP-A-55-150623 (JP, A)

Claims (2)

[Claims] 1. A reception control means for changing a reception frequency of an in-vehicle receiver to receive a radio wave, an identification means for identifying an information content of the received radio wave and generating an identification signal, and a plurality of different information content. Storage means for storing the visible pattern in advance as data, means for reading the corresponding visible pattern from the storage means in accordance with the identification signal, intensity detecting means for detecting the intensity of the received radio wave, and the intensity detecting means. And a display means for displaying the read visible pattern as well as the read intensity. 2. The information content identifying device according to claim 1, wherein the display means simultaneously displays the received radio wave intensity and the visible pattern for each received radio wave.