KR20020030924A - Car audio system using prestored local radio frequencies - Google Patents

Abstract

PURPOSE: A car audio system using prestored local broadcasting frequencies is provided to store each broadcasting frequency into all preset memory keys by prestoring broadcasting frequencies of each region and using a local mode selection key and an up/down key. CONSTITUTION: A micro computer portion(30) changes a current mode to a local selection mode when a local mode selection key(11) is pushed. A local name of current frequency is displayed on a display portion(50). An address is increased or reduced in a memory(31) of the micro computer(30) by operating an up-key(14) and a down-key(15). The local broadcasting channels stored in the memory(31) are transmitted and stored to each preset memory key(17). The local name is displayed on the display portion(50). The user can listen broadcasting of a corresponding region if a user operates one of memory keys(17) to listen desired broadcasting.

Description

CAR AUDIO SYSTEM USING PRE-STORED LOCAL FREQUENCY SPECIFICATIONS {CAR AUDIO SYSTEM USING PRESTORED LOCAL RADIO FREQUENCIES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car audio system, and more particularly, to a car audio system using each broadcasting frequency for each region using a region selection mode.

In general, a conventional car audio system has been used by manually operating a broadcast selection key (seek up / down) while a driver is driving a vehicle and manually selecting and storing a broadcast frequency into a preset memory key having a memory function.

In other words, in the conventional car audio system, when the user wants to search for a broadcast channel, the user selects the Seek key and sets the moving direction of the frequency by selecting an up key or a down key. Then, the microcomputer unit of the car audio system detects the presence or absence of a broadcast frequency by increasing or decreasing the current frequency by a predetermined unit. At this time, if the broadcast channel exists, the search function is terminated at the frequency at which the broadcast channel exists, and when the frequency of the found broadcast channel is to be stored, the storage key is selected and any one of the desired preset memory keys is selected. Will be selected. Then, the broadcasting frequency of the broadcasting station selected in the above process is stored at a predetermined position of the memory allocated to the selected preset memory key, and the above process is repeated to store the broadcasting channel in each of the preset memory keys.

However, the conventional method of storing the broadcast frequency of the car audio as described above is inconvenient to store a plurality of broadcast channels in a plurality of preset memory keys by sequentially operating the seek key, the up key, the storage key, and the preset memory key.

In addition, the broadcasting frequency is different for each region during long distance travel, and if you want to receive broadcasting frequencies that are differently transmitted because the region is changed, the function of the preset memory key is not easy if you store all the broadcasting channels in the same way as above. There is a problem.

In order to solve the above problems, a number of patent applications are disclosed.

Looking at the contents disclosed in the Patent Application Publication No. 1995-0037410, when the reception field strength is detected and continuously detected whether it is below a predetermined value to indicate a reception failure, other broadcasting stations previously inputted into the memory of the car audio system by the user A method of searching a list of broadcast frequencies, and sequentially detecting a received electric field strength of a broadcast frequency included in the list, and switching a reception channel to a broadcast frequency representing the strongest electric field strength is disclosed.

However, the above method is a very useful invention that can always listen to good quality broadcasts, but shows a different approach from the present invention using the local selection mode in terms of using the received field strength, and in particular while driving without using a preset memory key. It provides an optimal automatic switching method for only one broadcast. Therefore, the present invention is different from the present invention which uses the preset memory key by sequentially storing each broadcasting station frequency corresponding to the region in the preset memory key.

Many other applications also show a similar approach.

Accordingly, an object of the present invention is to solve the above-described problems, and an object of the present invention is to store a broadcasting frequency transmitted differently in each region in advance, and allow a user to select a local mode selection key and an up / down key provided by the present invention. This provides a car audio system that stores each station frequency in all preset memory keys with minimal manipulation when the area is changed.

In other words, an object of the present invention is to save the broadcast channel back to the preset memory key with minimal manipulation when the area is changed, to reduce unnecessary operation during operation and to improve user convenience.

Accordingly, the present invention is characterized by providing a local mode selection key to a car audio system, using an existing device including a conventional up / down key, and performing a software process in the microcomputer of the car audio system.

According to the present invention, a region selection mode for selecting each region in a car audio having a plurality of preset memory keys capable of storing frequencies of each broadcasting station, an up / down key for increasing or decreasing frequencies, and a plurality of keys A local mode selection key for contacting to switch to a switch; An up / down key operated to select an area by increasing / decreasing the address of the microcomputer unit after receiving the operation of the local mode selection key from the microcomputer unit and changing to the local selection mode; And increasing / decreasing an address corresponding to each region in the memory according to a signal input from the up / down key, and automatically storing each broadcasting station frequency data for the region previously stored in the address in a preset memory key having a respective memory. The present invention provides a car audio system including a microcomputer unit.

In addition, the microcomputer unit has a function of increasing and decreasing an address of a memory in synchronization with a signal input by the up / down key in the region selection mode. In addition, the microcomputer unit has a function of outputting each region name to the display unit.

1 is a schematic perspective view of a car audio device of the present invention;

2 is a schematic view showing a car audio system of the present invention;

3 is a block diagram showing a system for selecting a region and storing each broadcast channel according to the present invention; And

4 is a flow chart showing an algorithm using a region selection mode of a car audio system according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: Key pad 11: Local mode selection key

13: upkey 14: downkey

17: Preset memory key 30: Microcomputer section

31: memory 40: electronic volume control

41: power amplifier 50: display unit

Referring to FIG. 1, a radio unit of the car audio device 10 is illustrated. In the front, a keypad 1 and a display 52 are provided. The display 52 is composed of an LCD panel and displays the operating state of the radio. Key pad 1 is provided with a plurality of keys, according to the present invention local mode selection key 11 in contact to select the broadcast receiving area, the frequency up by a predetermined unit to detect the presence or absence of a broadcast channel, If there is a broadcast channel, the scan key 12 performs a function of searching for a broadcast channel by outputting the broadcast of the found broadcast channel for a while and then increasing the frequency again and detecting the first time when searching for a broadcast channel. It is fixed to a predetermined broadcast channel, the seek key 13 to perform a function to output the broadcast of the fixed broadcast channel, an up key 14 for increasing the frequency by a predetermined unit, down to down the frequency by a predetermined unit Key 15, a storage key 16 for storing a selected broadcast channel or reading a stored broadcast channel, a preset memory key 17 for storing a broadcast channel selected by a user, and turn on / down And it has a volume control key 19 that functions to control the volume is illustrated.

The local mode selection key 11 described above is a key operated for selecting the changed area. That is, pressing the local mode selection key 11 changes to the region selection mode, and then the current region can be selected using the up / down keys 14 and 15.

Referring to Fig. 2, there is shown a schematic configuration of car audio in which the keypad 1 includes a local mode selection key 11 (Fig. 1).

The car audio system according to the present invention includes an antenna 21, an AM / FM tuner 22, an AM / FM detector 23, a microcomputer unit 30, a keypad 1, an electronic volume control unit 40, and electric power. It consists of an amplifier 41, and a plurality of speakers 42, an LCD driver 51, and an LCD display 52.

The antenna 21 receives broadcast waves transmitted from broadcasting stations.

The AM / FM tuner 22 may select AM and FM and may select a broadcast frequency. This operation is controlled by the microcomputer unit 30. Although the detailed configuration of the AM / FM tuner 22 is not shown, a band pass filter, an RF amplifier, a mixing circuit, an IF amplifier, a local oscillator, and the like are included. A second detection stage is also included.

The AM / FM detector 23 refers to, for example, a detector for a super heterodyne receiver, and a stereo demodulation circuit is used to separate a high-pitched part and a low-pitched part to transmit stereo left and right signals of an audible frequency.

The microcomputer 30 controls the operation of the LCD driver 51, the tuner 22, and the electronic volume controller 40 according to a signal input of the keypad 1. In addition, when the power-on signal and the selection signal are applied, the microcomputer unit 30 turns on the tuner 22 and controls their broadcasting frequency selection operation, and controls the LCD driver 51 to control the LCD display 52. Display the selected broadcast frequency. In addition, when the volume signal is applied, the microcomputer unit 30 controls the amplification degree of the electronic volume control unit 40 and the power amplifier 41 to adjust the radio listening sound output through the speaker 42. In addition, by receiving the input of the local mode selection key (11: Fig. 1) of the present invention is switched to the local mode is adjusted by the up / down keys to broadcast the regional broadcasting channels stored in the memory 31 to the preset memory key (17: Fig. 1) It has a function to save. The microcomputer 30 may include a control program to control the overall operation of the car audio system.

The LCD driver 51 displays the execution state of the system as the key of the keypad 1 is operated on the LCD display 52 by the microcomputer 30. After the power is turned on, when the broadcast selection key (seek up / down) is operated, a selection signal is applied to the micom unit 30 and at the same time a broadcast frequency controlled by the microcomputer unit 30 is controlled according to the selection signal. The variation state is displayed on the LCD display 52.

The electronic volume control unit 40 controls the amplification degree of the amplifier to execute the volume up / down when the volume control key 19 (Fig. 1) is applied to the microcomputer unit 30.

The power amplifier 41 amplifies the voice signal according to the amplification degree adjusted by the electronic volume controller 40 and transmits the voice signal to the speaker 42.

Referring to FIG. 3, according to the present invention, an apparatus for selecting a region and storing each broadcast channel is briefly shown. In the configuration, the local mode selection key 11, up / down keys 14 and 15, the microcomputer unit 30, the memory 31 in the microcomputer unit, the display unit 50, and the preset memory key 17 Each preset memory key consists of a built-in memory 17a.

When the local mode selection key 11 is pressed, the microcomputer unit 30 switches to the region selection mode, and the display unit 50 displays the broadcast listening region name of the current frequency. Thereafter, when the up key 14 and the down key 15 are operated, the address is increased or decreased in the memory 31 of the microcomputer unit 30 in synchronization with the up / down keys 14 and 15 according to the operation. The regional broadcasting channels stored in the memory 31 during the increase / decrease are respectively transmitted to and stored in the preset memory key 17 (the storage is in the memory embedded in the key), and the region name is displayed on the display unit 50. Thus, if one of the preset memory keys 17 is manipulated to listen to a desired broadcast, the user can immediately listen to the broadcast transmitted from the area. If listening is good, operate the local mode selection key again to release the region selection mode.

For example, when a driver who is driving while listening to a broadcast in one region moves to another region, the broadcast currently being listened to is in a bad reception state. At this time, if the driver selects a region in the same manner as above without searching for a broadcasting frequency having a good reception electric field strength by operating several keys, the driver is already stored in the order of frequencies in the preset memory key 17, and thus the desired preset memory key 17 You can listen to the desired broadcast channel immediately by just operating it.

Referring to FIG. 4, an algorithm using a region selection mode of a car audio system according to the present invention is shown. In step S1, it is determined whether the FM broadcast is selected, and if the FM broadcast is selected, the preset memory key is operated in step S2 to select and listen to the broadcast frequency. If AM broadcast is selected, no regional selection mode is required. In the next step S3, the user determines whether the listening is good. If listening is good, then no zone selection mode is required. This is because the broadcasting frequency currently being listened to is the broadcasting frequency currently transmitted from the region. If the listening is not good, the user operates the local mode selection key 11 in step S4. Then, in step S5, the up / down keys 14 and 15 are operated while looking at the area displayed on the display unit. In the next step S6, the local broadcasting station frequency is automatically stored in the preset memory key 17. The order of storing is sequentially stored from the stations of the lower frequency to the stations of the set frequency in the order of the numbers of the preset memory keys 17. Then, in step S7, the user determines whether the listening is good, and if it is not good, since the region selection is wrong, the process continues to step S5 and the subsequent steps are repeatedly performed. If listening is satisfactory in step S7, then in step S8, the local mode selection key 11 is operated again to release the area selection mode. The above steps may be performed to sequentially store a broadcasting station frequency suitable for the region in the preset memory key 17.

As a preferred embodiment of the present invention, the broadcasting frequency for each region stored in the memory of the microcomputer unit allows the adjacent regions to be adjacent to each other on the address so that the driver can select the corresponding region with minimum key manipulation when the driver moves from one region to the next region. It is recommended to have

In FM broadcasting, when the driver's vehicle moves to another region, when the driver's vehicle deviates from about 50 km due to the nature of the broadcasting wave, the reception ability drops sharply (about 30 dB㎶), and various kinds of noise (noise) occur, but as described above, The invention improves reception performance by automatically receiving the broadcast of the area by using the area selection mode, and does not require additional parts because it makes full use of the current part. Only local mode selection key is added. That is, there is no additional cost increase factor because it uses the same parts and has the same weight as the current car audio and solves the program. As a result, there is no cost increase factor in the price, thus improving the merchandise.

In addition, since unnecessary operation during driving is reduced, convenience driving is improved by improving safety driving.

Claims (3)

In car audio having a plurality of preset memory keys capable of storing frequencies of respective broadcasting stations, up / down keys for increasing and decreasing frequencies, and a plurality of keys, A local mode selection key installed to switch to a region selection mode for selecting each region; An up / down key operated to select an area by increasing / decreasing the address of the memory of the microcomputer unit in the region selection mode after receiving the operation of the local mode selection key from the microcomputer unit; And According to the signal input from the up / down keys, the address corresponding to each region is increased or decreased in the memory, and the station frequency data for the region previously stored in the address is automatically stored in a preset memory key having a respective memory. Car audio system comprising a microcomputer. The car audio system of claim 1, wherein the microcomputer unit is synchronized with a signal input by the up / down key in the region selection mode to increase or decrease an address of a memory. The car audio system of claim 1, wherein the microcomputer outputs the names of the regions to the display unit.