JPH04133511A - On-vehicle radio receiver - Google Patents

Abstract

PURPOSE:To stabilize the broadcast receiving state of this radio receiver by inhibiting automatic channel tuning operations by means of an AF list when a program identification code(PI code) of a broadcasting station selected based on a set channel selecting means does not coincide with the PI code stored in a preset channel selecting means in advance. CONSTITUTION:Frequencies and PI codes are stored in advance in a memory area 14 provided on a preset channel selecting means 13. When a program code identifying means 16 identifies that the program identification(PI) code of a tuned station does not coincide with the PI codes in the memory area 14 at the time of making preset channel tuning, an alternative frequency(AF) searching means 12 starts the searching of an alternative frequency. Since a muting circuit 7 is operated during the searching operations of the means 12, no noise is led to a loudspeaker 6a. When the searching of the alternative frequency is not required, the searching operations are stopped by operating the function switch 18 of a function instructing means 17.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention provides an in-vehicle radio that is capable of receiving data from a Radio Data System and searching for an alternative frequency to the frequency currently being received. Regarding the receiver.

(b) Prior art/invention or problem to be solved Rad
In-vehicle radio receivers that can receive data from the io Data System (hereinafter referred to as RDS) are equipped with R.
An in-vehicle radio receiver is provided that automatically selects broadcast stations with the same broadcast content using a DS alternative frequency list (referred to as an AF list).

In particular, products that enable preset channel selection store program identification codes (PI codes) in memory, and when preset channel selection is performed,
The broadcasting station with the designated PI code is selected from the F list.

However, if there is no broadcasting station with the designated PI code nearby as the vehicle moves, the tuning operation will be repeated over and over again, and the muting circuit will operate at predetermined intervals during tuning, so the sound will not be heard. The drawback was that the cuts were noticeable and harsh on the ears.

This invention has been made in view of the above-mentioned points, and its purpose is to have a preset tuning means for pre-memorizing frequencies and PI codes, and calling up the memorized data for tuning. When the PT code of the broadcast station selected based on the preset tuning means is not the same as the PI code stored in advance in the preset tuning means, automatic tuning operation using the AF list can be prohibited. Therefore, it is an object of the present invention to provide a new in-vehicle radio receiver that enables stable broadcast reception.

(c) Means to solve the problem FIG. 1 is a functional block diagram of the present invention.

The single-mounted radio receiver of this invention is Radio Dat.
An in-vehicle radio receiver that can receive data from aSystem includes a preset channel selection means for pre-memorizing a predetermined frequency and a program identification code and selecting a station by calling the stored data; program code identification means for identifying whether or not the program identification code of the tuned broadcasting station is the same as the program identification code stored in advance in the preset channel selection means; and reception based on the identification result of the program code identification means. The present invention is comprised of an alternative frequency search means for searching for an alternative frequency for the frequency in the middle, and a function instruction means for instructing to enable or disable the operation of the alternative frequency search means.

(d) Effect The operation of this invention will be explained using FIG. 1.

The frequency and P■ code are stored in advance in the memory of the preset channel selection means.

Then, operate the preset switch of the preset channel selection means to select a preset channel, or check that the PI code of the selected station is the same as the PI code in the memory of the preset channel selection means. When the identification means identifies the broadcast station, the broadcast station is received.

Further, when the program code identifying means identifies that the PI code of the selected station is not the same as the PI code in the memory of the preset tuning means, the alternative frequency searching means starts searching for an alternative frequency.

If the user does not wish to search for an alternative frequency, the user operates the function switch of the function instruction means to stop the search.

(E) Embodiment An embodiment of the in-vehicle radio receiver according to the present invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 is Radio Data 5ysten+
(hereinafter referred to as RDS) Antenna 2 of a car radio receiver capable of receiving data of RDS; 2 is a front having a high frequency amplifying section that amplifies radio waves received by antenna 1 and a mixer section that converts them to a predetermined intermediate frequency; 3 is a PLL circuit that functions as a local oscillator for the front end 2; 4 is an intermediate frequency amplifier circuit including a detection circuit; 5 is a volume volume adjuster for adjusting the detection output level of the intermediate frequency amplifier circuit 4; 6 is an audio amplifier section; 7 is a muting circuit provided between the volume volume control 5 and the audio amplifier section 6; 8 is a reception sensitivity detection means that is guided from the intermediate frequency amplification circuit 4 and detects the state of received radio waves; 9 is an intermediate frequency R demodulates RDS data from the output of the amplifier circuit 4
DS data demodulation means; 10 is a microcomputer that controls this in-vehicle radio receiver; II is a RAM that stores alternative frequency data (hereinafter referred to as AF data); 1;
2 is an alternative frequency search means for searching for an alternative frequency for the frequency being received based on the AF data in RAMII; 13 is a preset for pre-memorizing a predetermined frequency and PI code and calling the memorized data for tuning. A channel selection means 14 is a memory area of a RAM II constituting the preset channel selection means 13 provided for storing frequencies and PI codes for presetting, 15 is a preset switch, and 16 is a channel selection based on the preset channel selection means 13. Program code identification means 17 identifies whether or not the PI code of the broadcast station selected is the same as the PI code stored in advance in the preset channel selection means I3; function instruction means for instructing (invalid), 1
Reference numeral 8 denotes a function switch constituting the function instruction means 17.

Next, the operation of the in-vehicle radio receiver configured as described above will be explained.

In the memory area I4 provided for the preset channel selection means 13, frequencies and PI codes are stored in advance.

Then, either operate the preset switch 15 of the preset tuning means 13 to perform preset tuning, or at this time, if the l'l code of the selected station and the memory area 14 provided for the preset tuning means 13 are the same, When the program code identification means 16 identifies that there is a broadcast station, that broadcast station is received.

The program code identification means 1 also checks that the PI code of the selected station and the P■ code in the memory area 14 are not the same.
6, the alternative frequency search means 12 starts searching for an alternative frequency.

Note that since the muting circuit 7 is operated during the search, noise is not introduced to the speaker 6a.

If the search for an alternative frequency is not desired, the function switch 18 of the function instruction means 17 is operated to stop the search.

In addition, when selecting a preset station, if the PI code is different, a warning tone will sound for a certain period of time, and if the same preset switch is operated during that time, the current station will be received as is, and if no operation is performed, the alarm will sound. may start a search for an alternative frequency.

(f) Effects of the Invention Since the in-vehicle radio receiver according to the present invention is constructed as described above, the following effects can be achieved.

■Since the operating state of the receiver can be selected by the user, it is possible to respond to various user needs and receiving states.

■Since you can stop the search operation, you can avoid harsh sound cuts and achieve stable reception.

[Brief explanation of 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 this vehicle-mounted radio receiver. Explanation of main symbols 12: Alternative frequency search means 13 Nib reset channel selection means 15 Nib reset switch 16: Program code identification means 17: Function instruction means 18: Function switch $1 diagram

Claims (1)

[Scope of Claims] An in-vehicle radio receiver capable of receiving data from a RadioData System, comprising a preset channel selection means for storing a predetermined frequency and a program identification code in advance and selecting a channel by calling the stored data; program code identification means for identifying whether a program identification code of a broadcast station selected based on the station means is the same as a program identification code stored in advance in the preset channel selection means; and identification of the program code identification means. It is characterized by comprising an alternative frequency search means for searching for an alternative frequency for the frequency being received based on the result, and a function instruction means for instructing to enable or disable the operation of the alternative frequency search means. In-vehicle radio receiver.