KR19980048234A - Automatic search for broadcasting channel of car radio - Google Patents

Abstract

The present invention relates to a method for automatically searching for a broadcast channel of a car radio, comprising: a function key operation determination step of determining whether a function key operation unit is operated, a microcom control step of outputting tuning data by operation of the function key operation unit; A frequency tuning step of a tuner unit for selecting a broadcast signal of a desired channel among a plurality of high frequency signals derived from an antenna by inputting a tuning voltage of an interlocked PLL IC in response to the tuning data of the microcomputer and broadcasting tuned through the tuner unit; An amplifying step of a tuning signal for amplifying and outputting a signal; a step for checking a broadcasting state of an A / D converter for determining whether a signal of a channel being broadcast is in normal or abnormal output state by selection of the function key operation unit; In case of normal output status according to the broadcasting status check step of the / D converter, turn off MUTE to restore normal volume. A sound reduction step of enabling a sound reduction, a sound reduction step of blocking a noise signal by turning on MUTE in an abnormal output state by a broadcasting state checking step of the A / D converter, and broadcasting of the A / D converter By the state check step, if the time of the sound reduction step that is operated in the abnormal output state is less than the reference time determined by the reference time whether or not to allow normal broadcast output, and by the reference time exceeded determination step When the time of the sound reduction step is exceeded the reference time, the broadcast channel automatic search step that allows the microcomputer to automatically search for other broadcastable channels, so that the broadcast signal that can appear during the long distance driving of the car Actively responds to changes in the hearing loss area and broadcasting channels in each area Capable of receiving different broadcasting channels without manual intervention has beneficial effects that can be detected automatically.

Description

Automatic search for broadcasting channel of car radio

The present invention relates to a method for automatically searching for a broadcast channel of a car radio, and in particular, automatically searches for other broadcast channels that can be received without a driver's manual operation by actively responding to changes in a broadcast channel and a hearing loss area in a long distance while driving a car. The present invention relates to a method for automatically searching for a broadcast channel of a car radio.

In general, a method for searching a broadcast channel of a car radio includes operations of a microcomputer and a tuner unit which are linked by a direct operation of a fixed function key that has already stored a broadcast channel to be listened to and a search function key to actively search for a broadcast channel to be listened to. This refers to a search method in which the frequency of a channel currently being broadcast is tuned to be normally output to the listener through a sputter.

Referring to FIGS. 1 and 2, a broadcast channel tuning apparatus for a car radio according to the related art operated by the above method and a searching method thereof are as follows.

1 is a block diagram illustrating a conventional broadcast channel selecting apparatus for explaining a broadcast channel search method of a car radio according to the prior art, and FIG. 2 is a flowchart illustrating a broadcast channel search method of a car radio according to the prior art. .

First, the broadcast channel tuning apparatus of a car radio according to the prior art, as shown in Fig. 1, the PLL IC (30) is interlocked by receiving the tuning data from the microcomputer 20 by the channel tuning of the function key operation unit 10; And a tuner unit 40 that receives the tuning voltage of the PLL IC 30 and tunes a high frequency signal of a frequency band to be tuned among a plurality of high frequency signals induced from the antenna ANT to apply to the amplifier 50. Is made of.

At this time, the tuner unit 40 is connected to the A / D converter 60 for converting the analog signal of the FM input signal and the AM input signal to a digital signal and applied to the microcomputer 20, the tuner unit 40 The amplifying unit 50 for amplifying the tuning signal applied from the amplification operation is turned off when the broadcasting signal is selected by the on / off control of the MUTE by the control of the microcomputer 20. On the other hand, when the broadcast signal is being searched, the amplification operation is cut off by turning the sound ON.

On the other hand, the function key operation unit 10 includes a search function key 12 for actively searching for a broadcast channel to be listened to, and a fixed function key 11 that has already stored the broadcast channel to be listened to.

Referring to the broadcast channel search operation of the conventional car radio made of the above configuration as follows.

First, when the broadcast channel tuning signal is input to the microcomputer 20 by the operation of the function key operating unit 10 as shown in FIG. 1, the microcomputer 20 supplies the tuning data to the PLL IC 30. The PLL IC 30 receiving the tuning data supplies a tuning voltage to a voltage controlled oscillator (not shown) of the tuner 40. Thereafter, a broadcast signal of a desired channel is tuned among the plurality of high frequency signals induced from the antenna ANT by the oscillation frequency of the voltage controlled oscillator and applied to the amplifier 50.

Meanwhile, the microcomputer 20 reads the DC level values of the FM input signal and the AM input signal of the tuner 40 through the A / D converter 60 to recognize the presence or absence of a broadcast signal. When the broadcast signal tuned by the 40 is normally output, the MUTE is turned off to release the sound reduction so that the broadcast signal is normally output, while the broadcast signal tuned by the tuner 40 is located in the hearing loss area. When the noise signal is excessively mixed, the output of the broadcast signal is blocked by turning on the MUTE to turn off the sound, thereby preventing the listener from hearing an unpleasant noise signal.

Referring to the broadcast channel searching method of a car radio according to the prior art constituting the configuration and operation as follows.

As shown in FIG. 2, a broadcast channel search method for a car radio according to the related art has a function key operation state for determining whether the fixed function key 11 and the search function key 12 of the function key operation unit 10 are operated. Determination step (S110), the microcomputer control step (S120) for outputting the tuning data by the operation of the function key operation unit 10, and the PLL IC is applied to the tuning data of the microcomputer 20 to generate a tuning voltage Tuning voltage generation step (S130) and the frequency tuning step of the tuner unit for selecting the broadcast signal of the desired channel among a plurality of high frequency signals induced from the antenna ANT by receiving the tuning voltage of the PLL IC (30) (S140) Then, the broadcast signal is delivered to the listener through the tuning signal amplification step (S150) of amplifying unit for amplifying and outputting the broadcast signal tuned through the tuner unit 40.

However, according to the conventional method of searching for a broadcast channel of a car radio, when a car runs on a section section in which a broadcast channel is selected and propagated differently for each region, the broadcast channel to be listened to depends on the radio wave of each region. In the case of a change, the driver has to tune to another receivable broadcasting channel by directly operating a search function key, which has a big disadvantage of causing danger while driving the vehicle.

In addition, there is a problem in that the driver must manually operate the function key control unit to search for a broadcast channel that is also receivable in a hearing loss area due to a terrain or a terrain such as a tunnel or a mountain.

Accordingly, the present invention has been made to solve the above problems, and the object of the present invention is to passively respond to changes in the broadcast signal of each region and the deafness region of the broadcast signal that may appear during long distance driving of the vehicle. The present invention provides a method for automatically searching for a broadcast channel of a car radio, which enables to automatically search for another broadcast channel that can be received without manipulation.

1 is a block diagram showing a conventional broadcast channel tuning apparatus for explaining a broadcast channel searching method for a car radio according to the prior art.

2 is a flowchart illustrating a broadcast channel searching method of a car radio according to the prior art.

3 is a flowchart illustrating a method for automatically searching for a broadcast channel of a car radio according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: function key control panel 11: fixed function keys

12: Search function key 20: Microcomputer

30: PLL IC40: Tuner part

50: amplifier 60: A / D converter

ANT: antenna

S110: step of determining whether the function key operation

S120: control step of the microcomputer

S130: Tuning voltage generation step of PLL IC

S140: Frequency tuning step of tuner part

S150: Amplification step of the tuning signal of the amplifier

S210: Checking broadcasting status of A / D converter

S220: sound reduction step

S230: sound reduction step

S240: determination step of exceeding the reference time

S250: broadcast channel automatic search step

In accordance with another aspect of the present invention, there is provided a method for automatically searching a broadcast channel of a car radio, comprising: determining whether a function key operation unit is operated, and outputting tuning data by operation of the function key operation unit; A frequency tuning step of a tuner unit for selecting a broadcast signal of a desired channel among a plurality of high frequency signals derived from an antenna by inputting a control step of a microcomputer and a tuning voltage of a PLL IC interworked with the tuning data of the microcomputer; and the tuner The amplification step of the amplifying unit for amplifying and outputting the broadcast signal tuned through the unit, and checking the broadcasting state of the A / D converter for determining whether the signal of the channel being broadcast is normal and abnormal output state by selection of the function key control unit. And MUTE in the normal output state by the broadcasting state checking step of the A / D converter. A sound reduction step for outputting a normal volume by squeezing the sound; a sound reduction step for blocking a noise signal by turning on MUTE in an abnormal output state by the broadcasting state checking step of the A / D converter; Determining whether or not the reference time is exceeded to enable normal broadcast output when the time of the sound reduction step that is operated in the abnormal output state by the broadcast state check step of the A / D converter is less than the predetermined reference time, and the reference time When the time of the sound reduction step is exceeded by the reference time by the determination of the excess, it consists of an automatic channel search step that allows the microcomputer to automatically search for other broadcastable channels.

Accordingly, in the method of automatically searching for a broadcast channel of a car radio according to the present invention, the broadcast channel to be listened to when listening to each section by driving a vehicle in a section section for selecting and propagating the broadcast channel for each region differently When it is changed according to the radio wave of the area or due to the geographical condition, it can automatically search for other broadcast channels that can be received without manual operation by the driver.

EXAMPLE

Hereinafter, a method for automatically searching for a broadcast channel of a car radio according to the present invention will be described with reference to FIGS. 1 and 3.

3 is a flowchart illustrating a method for automatically searching for a broadcast channel of a car radio according to the present invention.

In the method of automatically searching for a broadcast channel of a car radio according to the present invention, as illustrated in FIG. 3, a function key operation determination step (S110) of determining whether the function key operation unit 10 is operated or not, and the function key operation unit 10. Control step of outputting the tuning data (S120) and the tuning voltage of the PLL IC (30) interlocked by receiving the tuning data of the microcomputer 20 is inputted from the antenna (ANT) A frequency tuning step (S140) of a tuner unit for selecting a broadcast signal of a desired channel among a plurality of high frequency signals, and a tuned signal amplification step (S150) of amplifying unit for amplifying and outputting a broadcast signal tuned through the tuner unit 40; Checking the broadcast state of the A / D converter to determine whether the signal of the channel being broadcast is normal and abnormal output state by selecting the function key operation unit 10 (S210), and checking the broadcast state of the A / D converter. Step (S2 10) in the case of the normal output state by turning off the mute to output the normal volume by mute off step (S220), and the abnormal state of the broadcast state by the broadcast state check step (S210) of the A / D converter In the case of the sound reduction step to suppress the noise signal by turning on the MUTE, and the time of the sound reduction step (S230) that is activated when the abnormal output state by the broadcast state check step (S210) of the A / D converter When the reference time is less than a predetermined time, the determination of whether or not to exceed the reference time (S240) and the reference time exceeding determination step (S240) by the sound reduction step (S230) is greater than the reference time In this case, the broadcast channel automatic search step (S250) allows the microcomputer 20 to automatically search for another broadcastable channel.

At this time, in the broadcasting state check step (S210) of the A / D converter, the broadcast signal tuned by the selection of the search function key 12 and the fixed function key 11 of the function key operation unit 10 is for each region. Due to differently selected radio frequency or terrain conditions, it is possible to determine the normal and abnormal output state of the broadcast signal according to the change of the reception channel which may appear during long distance driving of the driver, and the sound reduction step (S220) and the sound reduction step ( S230 detects the normal and abnormal output state of the broadcast signal by checking the broadcast state of the A / D converter (S210) to turn on / off the MUTE so that the normal volume can be output as it is, while the noise signal Prevents them from providing noise to the listener.

On the other hand, the step of determining whether or not to exceed the reference time (S240), the reference time is determined by the time of the sound reduction step (S230) that is operated in the abnormal output state by the broadcast state check step (S210) of the A / D converter If the comparison time is less than the normal broadcast output can be compared, and if the comparison time exceeds the reference time, the microcomputer 20 can automatically search for other broadcastable channels.

As described above, according to the present invention, a method of automatically searching for a broadcast channel of a car radio includes a broadcast channel to be listened to when a car runs on a section section for selecting and propagating a broadcast channel differently for each region. The driver can select a broadcast channel by automatically responding to changes in radio waves or when a hearing loss occurs due to terrain conditions, and automatically searching for other broadcast channels that can be received without the driver's manual operation. In order to eliminate the hassle of manual operation in order to prevent the risk of driving has a useful effect.

Claims (1)

A function key operation determination step of determining whether the function key operation part is operated; A microcomputer control step of outputting tuning data by operation of the function key operation unit; A frequency tuning step of a tuner unit for selecting a broadcast signal of a desired channel among a plurality of high frequency signals derived from an antenna by inputting a tuning voltage of an interlocked PLL IC by receiving the tuning data of the microcomputer; A tuning signal amplifying step of amplifying unit for amplifying and outputting the broadcast signal tuned through the tuner unit; Checking the broadcast status of the A / D converter to determine whether the signal of the channel being broadcast is in normal or abnormal output state by selection of the function key operation unit; A sound reduction release step of outputting a normal volume by turning off MUTE in the normal output state by the broadcasting state checking step of the A / D converter; A sound reduction step of blocking the noise signal by turning on MUTE in the abnormal output state by the broadcasting state checking step of the A / D converter; Determining whether or not to exceed the reference time to enable a normal broadcast output when the time of the sound reduction step that is operated in the abnormal output state by the broadcast state check step of the A / D converter is less than a predetermined reference time; When the time of the sound reduction step is greater than the reference time by the step of determining whether the reference time exceeds, the broadcast channel automatic search step to enable the microcomputer to automatically search for another broadcastable channel Automatic search for broadcasting channels of radio.