KR960004809B1 - Fm/am receiver - Google Patents

Abstract

The method makes it automatic to select and memorize a desired stereo broadcasting frequency irrespective of the bandwidth mode of AM and FM broadcasting so that it can reduce the time for adjusting the receiver to a desired frequency in the conventional method. The method comprises the steps of : determining if an automatic stereo broadcasting selection function is operating : determininng if the bandwidth mode of the selected frequency is AM or FM; a step of displaying the selected braodcasting frequency on the LCD if finished with searching the desired frequency, otherwise continuing the search process by converting the bandwidth modes.

Description

Auto Tuning and Automatic Storage of Stereo Broadcasting by FM / AM Receivers

1 (a) is a flowchart for explaining a conventional broadcasting station tuning method.

1 (b) is a flowchart for explaining a conventional broadcasting station storage method.

2 is a hardware block diagram of an FM / AM receiver according to the present invention.

3 is a flowchart for explaining a stereo broadcasting automatic tuning method according to the present invention.

4 is a flowchart for explaining a stereo broadcasting automatic storage method according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Front end part 2: Phase lock loop (PLL) part

3: intermediate frequency amplification and detection unit 4: stereo demodulation unit

5: microcomputer 6: key input unit

7 liquid crystal display 8 amplification unit

The present invention relates to a stereo broadcasting automatic tuning method and an automatic storage method in an FM / AM receiver. In particular, the present invention is suitable for easily listening to a stereo broadcast within a short time without band division of FM and AM broadcasting.

In the conventional FM / AM receiver, a station selection method does not adopt the automatic tuning method of a station broadcasting in stereo sound as shown in (A) of FIG. 1, and selects a station without distinguishing between stereo sound and mono sound broadcasting. As a method, since the same operation must be performed repeatedly in order to tune stereo broadcasts, the tuning process is very cumbersome and time consuming.

In addition, when the band mode is the FM mode, tuning is possible only in the FM band, and in the AM mode, tuning is possible only in the AM band.

On the other hand, in the conventional FM / AM receiver, the broadcasting station storage method does not adopt the automatic storage method of the broadcasting station broadcasting in stereo sound as shown in FIG. 1B, and stores the stereo sound and the mono sound broadcasting without distinguishing it. As a method, it is not possible to automatically store only the broadcasting stations that broadcast in stereo, and especially when the band mode is the FM mode, the memory can be stored only in the FM band, and in the AM mode, the memory can be stored only in the AM band. Because of this, there was a problem that you must remember within a limited band.

The present invention has been made to solve the problems of the prior art, it is possible to distinguish between a station broadcasting in stereo sound and a station broadcasting in mono sound in the FM / AM receiver can be automatically tuned and automatically stored in a station broadcasting in stereo sound. In particular, the purpose of the present invention is to provide automatic tuning of FM / AM bands so that automatic tuning and automatic storage of broadcasting stations broadcasting in stereo sound can be performed more easily and quickly.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a block diagram illustrating a hardware block involved in performing stereo automatic tuning and automatic storage according to the present invention. The front end unit 1 amplifies a broadcast signal received through an antenna ANT into a high frequency signal. And amplifying and detecting a phase locked loop (PLL) section 2 for outputting a local oscillation frequency to the front end section 1 under the control of the microcomputer 5, and an intermediate frequency output from the front end section 1; The intermediate frequency amplifier and detector 3, the stereo demodulator 4 for demodulating the detected signal output from the intermediate frequency amplification and detector 3, and the microcomputer 5 which collectively controls the operation of each circuit unit. ), A key input unit 6 for inputting a control signal to the microcomputer 5, a liquid crystal display unit 7 for displaying an adjustment signal in letters or symbols on the microcomputer 5, and the stereo demodulator 4 Output from mono) It is configured to provided the amplifying section 8 for amplifying a signal Leo to a predetermined level.

FIG. 3 is a flowchart illustrating a stereo broadcasting automatic tuning method according to the present invention. In the microcomputer 5, a stereo broadcasting automatic tuning selection process for determining whether a stereo broadcasting automatic tuning is selected while listening to the broadcast is performed. The band mode selection process for determining whether FM or AM mode is selected in the automatic station selection process, and the FM or AM stereo broadcast search completion is determined for FM or AM mode in the band mode selection process, respectively. If it is, the FM or AM search stereo broadcasting frequency is displayed through the LCD, and if the search is not completed, the search is completed within the FM or AM band. If the search is completed, the band mode is switched to AM mode or FM mode, respectively. The band mode switching process was made.

4 is a flowchart illustrating a method for automatically storing stereo broadcasting according to the present invention, and in the stereo broadcasting automatic tuning selection process, it is determined whether or not the stereo broadcasting automatic storage selection status is selected in the stereo broadcasting automatic tuning selection process. After all memory memories are deleted, the band mode is selected, and in FM or AM mode, the FM or AM stereo stations are searched, respectively, and the memory memory is determined. After the memory has been stored, it is determined whether the search for the entire stereo broadcast in the band is completed. If the search is completed, the process is performed to determine whether the search for the stereo broadcast station in the entire band is completed after switching the band mode.

The operation and effects of the present invention made as described above are as follows. The microcomputer 5 determines whether the intermediate amplified signal through the intermediate frequency amplification and detector 3 shown in FIG. 2 is a broadcast station signal, and if it is a broadcast station signal, the signal detected by the intermediate frequency amplification and detector 3. The mono or stereo signal is obtained by the pilot signal of the stereo demodulator 4.

At this time, the microcomputer 5 determines whether the stereo broadcast auto-tuning is selected while listening to the mono or stereo signal, and when stereo is selected according to the current band state (FM or AM). Start searching for the stereo station of the broadcast.

In this case, if the search for the stereo broadcast station is completed within the same band, the search frequency is displayed through the liquid crystal display unit 7 and returned to the initial state to complete the stereo broadcast auto tuning operation.

If a stereo station cannot be searched until it is out of the low or high search frequency band within the same band, the stereo broadcast can be performed by switching the band mode from FM mode to AM mode or from AM mode to FM mode to search for stereo stations. You can auto tune.

That is, the present invention provides an automatic tuning method that skips a broadcasting station that broadcasts in mono and skips and selects a desired station while automatically switching the FM or AM band when tuning a stereo sound station. will be.

In addition, as shown in FIG. 4, the automatic storage method according to the present invention deletes all the memory memories of the currently stored broadcasting station when stereo broadcasting automatic storage is selected, and performs stereo broadcasting according to the FM or AM band state. While searching and storing from the preset first memory, the stereo broadcasting is searched for all frequency bands of the same band within the preset broadcasting station storage memory capacity and stored in the memory.

Thereafter, when the search of the entire frequency band within the same band is completed, the band mode can be switched from the FM mode to the AM mode or the AM mode to the FM mode to search for stereo stations as described above, and then automatically stored in the memory.

In other words, if you want to automatically memorize the broadcasting station in stereo sound, skip the mono sound broadcasting first, and then automatically switch the stereo broadcasting station to the FM or AM band and store the stereo broadcasting station within the memory capacity of the broadcasting station. Only a set memory number can be used to easily tune in to a desired stereo broadcast station and listen to it.

As described above, according to the present invention, even if the same operation is not repeatedly performed to listen to the stereo broadcasting, automatic tuning of the desired stereo broadcasting station is performed by automatic band switching within a short time, and at the same time, the stereo broadcasting is automatically switched. It is to memorize automatically, thereby providing an effect of listening to the memorized stereo broadcast as needed.

Claims (2)

A stereo broadcasting station automatic tuning method of an FM / AM receiver, comprising: a stereo broadcast automatic tuning selection process for determining whether a stereo broadcasting automatic tuning station is selected while listening to a broadcast; A band mode selection process for determining whether FM or AM mode is selected in the stereo broadcasting automatic channel selection process; In the band mode selection process, in the FM or AM mode, whether FM or AM stereo broadcast search is completed or not, and if the search is completed, the FM or AM search stereo broadcast frequency is displayed through the liquid crystal display (7). Alternatively, if the search is completed in the FM or AM band, the search circuit state determines whether the stereo mode of the FM / AM receiver is performed by a band mode switching process of switching the band mode to the AM mode or the FM mode, respectively. Automatic station tuning method. In the stereo broadcasting station storage method of the FM / AM receiver, it is determined whether or not the stereo broadcasting automatic storage selection state is selected when the stereo broadcasting automatic tuning selection process is performed to determine whether the stereo broadcasting automatic tuning is selected while the microcomputer 5 is listening to the broadcasting. Selecting a band mode after deleting all of the broadcasting station's memory if the automatic memory selection state is selected. After searching for FM or AM stereo stations, it is determined whether there is a memory memory. If there is a memory memory, the searched stereo stations are stored in the memory of the microcomputer (5). A method for storing a stereo broadcasting station of an FM / AM receiver, comprising: performing an automatic memory process of determining whether or not searching for a stereo station within the entire band is completed after switching the band mode.