JP2572456Y2 - Car radio receiver - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is an in-vehicle radio that can receive Radio Data System data and can search for an alternative frequency for the frequency being received. Regarding the receiver.

(B) Problems to be solved by the prior art / device The conventional radio data system is equipped with an in-vehicle radio receiver that is capable of receiving data. Search for a good broadcast station and receive the radio wave of that broadcast station.

By the way, in order to remove noise during the search, it is designed to be in a mu state (a state in which no sound is output) for a short time.

If the search station cannot find a broadcast station that can receive signals with a certain sensitivity or higher, it receives the radio wave of the original broadcast station again. Since the search operation is performed again, in such a state, there is a disadvantage that the sound is interrupted at regular intervals due to the search, which is annoying.

This invention has been made in view of the above points,
An object of the present invention is to provide an in-vehicle radio receiver in which a user instructs search conditions to reduce discomfort due to sound interruption as much as possible.

(C) Means for solving the problem FIG. 1 is a functional block diagram of the present invention.

The in-vehicle radio receiver of this invention is Radio Data Syste
In a car radio receiver that can receive m data,
Alternative frequency searching means for searching for an alternative frequency for the frequency being received, electric field intensity level setting means for setting the electric field intensity level at which the alternative frequency searching means starts searching, and a search for the alternative frequency searching means Thereafter, the search interval setting means for setting an interval until the search is performed again.

A program content designating means for designating program content in advance;
A search is performed according to the program content based on the result of the program content comparison means for comparing the program content data of the received signal with the data specified by the program content designating means.

(D) Operation The operation of the present invention will be described with reference to FIG.

According to this invention, when the search button is pressed, the electric field intensity comparing means compares the detection data of the reception sensitivity detecting means with the level data of the electric field intensity of the electric field intensity level setting means, but the detected data becomes small. Only when is the alternative frequency search means starts searching for an alternative frequency.

For this reason, the search for the alternative frequency does not start unless the electric field intensity becomes equal to or less than the electric field intensity designated in advance.

In particular, the electric field strength of each broadcasting station changes drastically depending on the location where the vehicle travels, so if the electric field intensity level is set finely according to the location of the vehicle, it is possible to minimize the sound interruption due to the search, Since the search interval setting means for setting the interval until the search is performed again after the search by the search means is provided, the user can instruct to perform the search at a time interval at which the sound interruption does not become uncomfortable.

Also, a search interval by the alternative frequency search means is set in advance for each program content, PTY data (program content display data) in the RDS data is detected, and the search interval can be switched according to the program content.

 For this reason, the number of searches is reduced, and the interruption of sound is reduced.

(E) Embodiment An embodiment of a vehicle-mounted radio receiver according to the present invention will be described with reference to FIG. 1 and FIG.

In the drawing, reference numeral 1 denotes an antenna of a vehicle-mounted radio receiver capable of receiving data of a Radio Data System (hereinafter, referred to as RDS); A front end having a mixer section for conversion; 3, a PLL circuit functioning as a local oscillator of the front end 2; 4, an intermediate frequency amplification circuit including a detection circuit; Reference numeral 6 denotes an audio amplifier unit, reference numeral 7 denotes a muting circuit provided between the audio volume unit 5 and the audio amplifier unit 6, and reference numeral 8 denotes a state of a radio wave received from the intermediate frequency amplifier circuit 4 and received. The receiving sensitivity detecting means 9 receives the output of the intermediate frequency amplifying circuit 4
RDS data demodulation means for demodulating RDS data, 10 is a microcomputer for controlling the on-vehicle radio receiver, 11
Is the received alternative frequency data (hereinafter referred to as AF data)
12 is an alternative frequency search means for searching for an alternative frequency for the frequency being received based on the AF data in the RAM 11, 12a is a search button for instructing a search start, 13
The alternative frequency search means 12 an electric field intensity level setting means for setting the level of the electric field strength to initiate a search, 13a is the electric field strength indication button of the electric field intensity level setting means 13 for entering level data d ₁ of the field strength, 14 is a receiving sensitivity detecting means 8
Detection by the data D and the electric field intensity level setting means 13 compares the level data d ₁ of the field strength to be set, the field strength comparison means for controlling the searching whether the alternative frequency search means 12 based on the result of the comparison, 15 Is a search interval setting means for setting an interval until a search is performed again after the search by the frequency search means 12, 15a is a time interval instruction button of the search interval setting means 15 for instructing time data, and 16 is previously designated. Program content instruction means for controlling the alternative frequency search means 12 so that the alternative frequency search means 12 searches for only broadcast stations transmitting PTY data (program content display data), and 16a designates program content data d ₂ ( the following program data instruction button of the program content instruction means 15 for inputting of data d _2), 17 compares the data d ₂ of the PTY data Dp and the program content instruction means 15 included in the AF list, PT for controlling a search whether the alternative frequency search means 12 based on the comparison result
It is Y data comparison means.

Next, the operation of the on-vehicle radio receiver thus configured will be described.

Now, in advance, it is assumed that the electric field intensity data d ₁ is input.

When the search button 12a is pressed in this state, the electric field strength comparing means 1
4 is the detection data D of the receiving sensitivity detecting means 8 and the electric field intensity level data set by the electric field intensity level setting means 13
comparing the d _1, but an alternative frequency search means 12 only when the detection data D becomes smaller than the data d ₁ begins searching for AF data.

For this reason, the search for the alternative frequency does not start unless the electric field intensity becomes equal to or less than the electric field intensity designated in advance.

During the search, since the muting circuit 7 is operated, noise is not guided to the speaker 6a.

Similarly, a user in advance of the desired and the data d ₂ pushes the search button 12a in the state that is entered by program content instruction means 15 alternative frequency search means 12 starts searching. At this time, the interval after the search until the search is performed again is performed based on the data of the search interval setting means. Further, the PTY data comparing means 17 outputs the PTY of the alternative frequency included in the AF list.
It compares the data Dp, and data d ₂ input, the alternative frequency search means only when the comparison result is identical to search the AF list.

 For this reason, the number of searches is reduced.

(F) Effects of the Invention According to the in-vehicle radio receiver according to the invention, since the above-described configuration is employed, it is possible to reduce the sound interruption that occurs during the search.

Moreover, it has excellent features such as easy implementation because it can be configured at low cost.

[Brief description of the drawings]

1 and 2 show an embodiment of a vehicle-mounted radio receiver according to the present invention. FIG. 1 is a functional block diagram, and FIG. 2 is a block diagram of the vehicle-mounted radio receiver. Explanation of main symbols 12: Alternative frequency search means 13: Electric field strength level setting means 14: Electric field strength comparison means 15: Search interval setting means 16: Program content instruction means 17: PTY data comparison means

Claims (2)

(57) [Scope of request for utility model registration] 1. An in-vehicle radio receiver capable of receiving data of a Radio Data System, an alternative frequency search means for searching an alternative frequency for a frequency being received, and an electric field for which the alternative frequency search means starts searching. An on-vehicle radio comprising: an electric field intensity level setting means for setting an intensity level; and a search interval setting means for setting an interval from a search for an alternative frequency search means to a search again. Receiving machine. 2. Program contents instructing means for instructing program contents in advance, and program contents comparing means for comparing program contents data of a received signal with data instructed by said program contents instructing means, based on a result of program contents comparing means. 2. The on-vehicle radio receiver according to claim 1, wherein a search is performed according to the following.