JP2949895B2 - Stereo set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereo set suitable for installation on a vehicle, for example.

[0002]

2. Description of the Related Art For example, in an FM tuner incorporated in a car stereo set, in addition to a general FM broadcast, for example, one FM
The setting is such that audio signals of television broadcasts of channels 3 to 3 can also be received.

There is also a demand that a television set is further incorporated into a car stereo set so that, for example, television broadcasts can be enjoyed during traffic jams.

[0004]

However, when a television set is added to a car stereo, reception of a television broadcast by an FM tuner becomes unnecessary, and
If the audio signal of the television broadcast is received during the tuning of the FM broadcast, the usability is deteriorated. SUMMARY OF THE INVENTION It is an object of the present invention to provide a stereo set with improved usability by disabling the reception of a television set even when the FM tuner is capable of receiving a television broadcast. is there.

[0005]

A stereo set according to the present invention comprises an FM tuner 3 capable of receiving an audio signal of a television broadcast as understood from, for example, FIG.
Detecting means 5 for detecting whether or not the television set 2 is connected; and prohibiting the FM tuner 3 from receiving the audio signal of the television broadcast on the condition that the television set 2 is connected. Means 5.

[0006]

In the stereo set according to the present invention, the audio signal of the television broadcast cannot be received by the FM tuner on condition that the television set is connected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a stereo set according to the present invention will be described below with reference to the drawings.

In FIG. 1, for example, a vehicle-mounted stereo set (car stereo) 1 includes an FM tuner 3, a system controller 5 (including a microcomputer or the like) for controlling the operation of the entire stereo set,
The key operation unit 7 and the like for performing a tuning operation and the like in the M tuner 3 are mainly configured.

The FM tuner 3 includes, in addition to a general FM broadcast, an audio signal of a television broadcast, 1ch to 3ch.
ch can also be received.

[0010] A television set 2 comprising a television monitor 2B such as a television receiving unit 2A and a CRT is connectable to the car stereo 1 as an option. signal indicating the fact is input through the signal line l ₁ to the system controller 5 (detecting means).

In this case, when the key operation section 7 is operated in a predetermined manner and the FM tuner 3 or the television set 2 is selected, the audio switching circuit 11 is switched by the controller 5 to operate the FM tuner 3 or the television set. A sound corresponding to the set 2 is output from the speaker 15 via the audio circuit 13.

The operation status of the key operation unit 7 such as the frequency at the time of tuning by the FM tuner 3 and the number of selected channels of the television set 2 is displayed on the display unit 9.

Here, when the controller 5 determines that the television set 2 has been connected via the signal line l ₁ , the FM tuner 3 controls the FM tuner 3 so that the television broadcast audio signal cannot be received. 5 is set (prohibiting means).

A procedure performed by the CPU of the system controller 5 when the television set 2 is connected and when it is not connected will be described with reference to FIG.

FIG. 2 shows a processing procedure when a button (provided on the key operation unit 7) for continuously changing the reception frequency of the FM tuner 3 to a higher frequency is kept pressed. Have been.

First, if the television set 2 is not connected (step S ₁ NO), and if the maximum audio frequency (for example, 3 ch) of the television broadcast is being received (step S ₂ YES), the next step is first. Returning, the minimum frequency of the FM broadcast is received (step S ₃ ), and thereafter the reception band is sequentially changed to 3 channels of the television broadcast.

[0017] Therefore, in step S _2, if you are not receiving a television broadcast, the process proceeds to step S ₄ because it is being received FM broadcast, in step S _4, not receive the maximum frequency of the FM broadcast receiving a minimum audio frequency of the television broadcast (1ch) proceeds to step S ₅ if Re.

Further, if not receiving the FM maximum frequency in step S _4, to receive the next FM frequency proceeds to step S _6.

On the other hand, when the television set 2 is connected (step S ₁ YES), the process proceeds to step S ₆ on condition that the maximum frequency of the FM broadcast is not being received (step S ₇ NO). If there is (Step S ₇ YE
S), since the audio signal receiving television broadcasting is prohibited, FM frequency to be received first back, the minimum frequency is received (Step S _8). As described above, in this embodiment, when the television set 2 is connected to the car stereo 1, the FM tuner 3 is prohibited from receiving the audio signal of the television broadcast.

Therefore, for example, inconveniences such as mixing of television sound during tuning of FM broadcasting and troublesome tuning are eliminated, and the usability of the car stereo 1 is improved.

The present invention can be applied to a general stereo set.

[0022]

As will be understood from the above description, in the stereo set according to the present invention, on the condition that the television set is connected, the FM tuner determines that the audio signal of the television broadcast cannot be received. Is done.

Therefore, for example, the inconvenience of receiving the audio signal of the television broadcast during the tuning of the FM broadcast is avoided, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a main part circuit configuration diagram of a stereo set according to the present invention.

FIG. 2 is a flowchart showing a processing procedure in a system controller to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 1 stereo set 3 FM tuner 5 system controller 2 television set 2A television receiving unit 2B television monitor 15 speaker

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 1/16 H04N 5/60

Claims (1)

(57) [Claims] An FM tuner capable of receiving an audio signal of a television broadcast, detection means for detecting whether or not a television set is connected, and FM on a condition that the television set is connected. Prohibition means for prohibiting the tuner from receiving television broadcast audio signals;
A stereo set comprising: