KR19990047267A - Alarm method when car audio reception is weakened - Google Patents

Abstract

The present invention relates to an alarm method when receiving a weakening of the car audio to check the signal output from the signal meter when listening to the radio broadcast of the car audio to output an alarm sound when the reception state is poor. It is determined whether an output signal of a signal that outputs a signal that is increased in proportion to the electric field strength of the signal is below a predetermined reference voltage. If the signal is less than the reference voltage, whether the output signal of the signal that is less than the reference voltage lasts more than a predetermined reference time. In this case, the control unit recognizes that the reception state is bad and outputs an alarm sound if the reception state lasts more than a predetermined reference time. There is an effect that can be done.

Description

Alarm method when car audio reception is weakened

The present invention relates to an alarm method when car audio is weakened so that an alarm sound can be output when a reception state is poor by checking a signal output from a signal meter when listening to radio broadcast of car audio.

In general, a car is equipped with car audio including a radio broadcast receiver, a cassette tape player, a compact disc player, and the like, so that a driver and a passenger listen to broadcast and music through the car audio.

On the other hand, when listening to the radio broadcasts there are many cases in which the radio broadcast reception state is not good due to the local conditions of the region in which the vehicle moves.

Accordingly, the driver and the passenger search for another broadcast having a good radio broadcast reception state to switch channels, or drive a cassette tape player or a compact disc player, which is another sound medium.

However, as described above, the driver and the passengers have had to check the radio broadcast reception status one by one. In particular, even when the reception is weakened due to a temporary obstacle in the reception area, the radio broadcast reception state is correct. There was a difficult problem to check.

The present invention has been made to solve the above problems, the object of which is to output a signal signal of the signal meter for numerically indicating the electric field strength of the broadcast signal input from the vehicle antenna when listening to the radio broadcast of the car audio for a certain time Check to determine if the reception is weak due to a temporary failure in the receiving area or if the reception is weak in that area. To provide a way.

In order to achieve the above object, an alarm method for weakening the reception of car audio according to the present invention includes whether the output signal of the signal meter outputting a signal that is increased proportionally to the electric field strength of the broadcast signal input from the vehicle antenna is below a predetermined reference voltage. If it is less than the reference voltage, it is determined whether the output signal of the signal meter below the reference voltage lasts more than a predetermined reference time, and if it is more than the predetermined reference time, it is recognized that the reception state is bad and outputs an alarm sound. It is characterized by a control box.

1 is a block diagram illustrating a car audio system to which an alarm method for weakening reception of car audio according to the present invention is applied;

2 is a flowchart illustrating an alarm control when car audio is weakened according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: Tuner part 2: IF amplifier part

3: voice demodulator 4: microcomputer

5: power amplifier

Hereinafter, with reference to the accompanying drawings will be described in detail the alarm method when the reception of the car audio according to the present invention.

FIG. 1 is a block diagram illustrating a car audio system to which an alarm method is applied when reception of car audio is weakened according to an embodiment of the present invention. The tuner unit selects a corresponding broadcast signal by tuning a signal input through a vehicle antenna (Ant). 1) and converts the broadcast signal output from the tuner 1 into an intermediate frequency and amplifies it to a predetermined level, and according to the electric field strength of the broadcast signal output from the tuner 1 An IF amplification section 2 for outputting a signal of the audio signal, a voice demodulation section 3 for demodulating the broadcast signal amplified by the IF amplification section 2 into an audio signal, and a system of the entire car audio; A microcomputer 4 for judging whether the signal of the signal output from the IF amplifier 2 continues below the reference voltage for a reference time or more and outputting an alarm control signal when the reception state of the broadcast signal is poor; Power amplification unit for power amplifying the audio signal output from the (3) to output to the speaker (SP), amplifying the alarm control signal output from the microcomputer (4) through the sub-amplification unit (A) 5) consists of.

The operation of the alarm device when the reception of the car audio configured as described above will be described with reference to the flowchart of FIG. 2.

First, a corresponding broadcast signal is selected by tuning a signal input from the vehicle antenna Ant through the tuner 1, and then the IF amplifier 2 converts the selected broadcast signal into an IF signal and amplifies it. do.

In this case, the IF amplifier 2 outputs a signal of a signal meter that is proportionally increased according to the electric field strength of the signal input from the vehicle antenna Ant.

Subsequently, the voice demodulator 3 demodulates the IF signal amplified by the IF amplifier 2 into an audio signal, and then power amplifies the demodulated audio signal by the power amplifier 5 to generate a speaker SP. Voice output through.

On the other hand, the microcomputer 4 checks the signal of the signal output from the IF amplifier 2 (S10), determines whether the signal of the signal is less than the reference voltage (S11), if the reference voltage is less than It is determined once again whether it lasts longer than the time (S12).

Here, a case where the output of the signal meter is temporarily below the reference voltage may occur.

That is, in the case of downtown, broadcasts intended to be received by high-rise buildings may be directly introduced into the antenna from the broadcasting transmission tower, but broadcast signals may be reflected by barriers such as buildings, resulting in a slight delay than the original signals, and then inputted to the antennas. In this case, temporary reception weakening occurs in the form of multi pass noise.

Therefore, the present invention recognizes the case where the output of the signal meter which is less than the reference voltage continues for more than the reference time, and performs the alarm operation only when the reception is weakened continuously.

Subsequently, when the output of the signal meter which is equal to or lower than the reference voltage in step S12 continues over the reference time, the microcomputer 4 finally determines that the reception state in the region is poor and outputs an alarm control signal to output the speaker SP. ) To output the alarm sound.

As described above, as described above, the driver and the passenger may recognize that the driver and the passenger are not temporarily weakened by the alarm sound output from the alarm device according to the present invention, and may easily switch to another broadcast or other sound medium.

Claims (1)

A tuner section 1 for selecting a corresponding broadcast signal, an IF amplifier section 2 for outputting a signal of a signal according to the electric field strength of the broadcast signal, and an audio demodulation section 3 for demodulating the broadcast signal into an audio signal; And a microcomputer 4 for controlling the entire car audio system and a power amplifier 5 for power amplifying and outputting a voice signal to the speaker SP, A first step of determining whether the signal of the signal is less than the reference voltage by checking the signal of the signal output from the IF amplifier 2, and if the signal of the signal is less than the reference voltage in the first step And a second step of determining whether the signal lasts longer than the time, and outputting an alarm control signal to output an alarm sound through the speaker SP when the output of the signal meter which is less than the reference voltage in the second step is longer than the reference time. Car audio receiving method characterized in that the third step to the weakening alarm method.