JPH04324708A - electronic tuning device - Google Patents

Abstract

PURPOSE:To facilitate the preset operation of a reception station implemented by each station. CONSTITUTION:Channel selection information stored in a memory card 30 is read by a read means 32 and stored in a storage means 34. Thus, in the case of next reception, a channel selection command signal is given to a channel selection control means 36. The channel selection control means 36 reads channel selection information commanded by a channel selection command signal from the storage means 34. The channel selection control means 36 gives the read channel selection information to a channel circuit 38. The channel selection circuit 38 carrys out the channel selection based on the given channel selection information. A reception station is preset in the electronic tuning device by using the memory card 30. Thus, it is not required to carry out the preset operation at each station and the preset is facilitated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic tuning device, and more particularly to facilitating the presetting of receiving stations.

0002

2. Description of the Related Art FIG. 6 shows an external view of a car radio as an example of a conventional electronic tuning device. FIG. 7 shows the circuit block diagram. This car radio has a channel selection button
By pressing CH1 to CH5, preset broadcast stations can be received.

[0003] The preset operation will be explained below. First, the user operates the variable channel selection button 10 to receive the broadcast station that he or she wants to preset. The variable channel selection button 10 is located at the upper part 10a.
By pressing , an UP signal is output, and by pressing the lower part 10b, a DOWN signal is output. When the UP signal is output from the variable channel selection button 10, the CPU 12
outputs tuning information to the tuner 18 to increase the reception frequency. Furthermore, when the DOWN signal is output, the CPU 12 outputs tuning information to the tuner 18 so as to lower the reception frequency. That is, by operating the variable channel selection button 10, a desired broadcast station can be received.

For example, in order to preset the currently received broadcasting station to the channel selection button CH1, the following operation is performed. Press the channel selection button CH1 and memory button 4 at the same time. Thereby, the CPU 12 stores the tuning information sent to the tuner 18 in the RAM 16 in association with the tuning button CH1. In this way, a desired broadcast station can be preset on the channel selection button CH1.

[0005] It should be noted that a desired broadcasting station can be preset in the same manner for the channel selection buttons CH2 to CH5.

Next, the reception operation will be explained. first,
Press the button for selecting the channel you want to receive, for example CH1. CPU12
reads out the channel selection information stored in association with the channel selection button CH1 from the RAM 16. The read out tuning information is
The signal is sent to the tuner 18. The tuner 18 selects and receives a channel based on the provided channel selection information. In this way, a desired broadcast station can be received simply by pressing the channel selection buttons CH1 to CH5.

[0007]

[Problems to be Solved by the Invention] However, conventional electronic tuning devices have the following problems. As mentioned above, the preset operation had to be performed for each station, which was complicated. Therefore, there is a problem in that it takes time to set and change the broadcasting station that one wishes to receive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide an electronic tuning device that can be easily preset.

[0009]

[Means for Solving the Problems] The electronic tuning device according to claim 1 comprises a reading means for reading out the tuning information recorded on the card, and a storage means for storing the tuning information read out from the card by the reading means. , a tuning control means that reads out tuning information corresponding to the station designated by the tuning command signal from the storage means and supplies it to the tuning circuit; and a tuning circuit that performs tuning based on the given tuning information. We are prepared.

0010

[Operation] In the electronic tuning device according to the present invention, the tuning information stored on the card is read out by the reading means and stored in the storage means. This performs presetting.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall configuration diagram of an electronic tuning device according to an embodiment of the present invention. memory card 30
A plurality of pieces of channel selection information are recorded. This channel selection information is read out by the reading means 32. The read channel selection information is stored in the storage means 34. This completes the presetting.

[0012] When performing the next reception, a channel selection command signal is given to the channel selection control means 36. The tuning control means 36 stores the tuning information instructed by the tuning command signal in the storage means 34.
Read from. The tuning control means 36 supplies the read tuning information to the tuning circuit 38. The channel selection circuit 38 performs channel selection based on the provided channel selection information.

FIG. 3 shows an external view of an electronic tuning device 1 according to an embodiment of the present invention. FIG. 2 shows its block diagram. In this embodiment, a ROM memory card 30 is used as the card used for presetting.

The memory card 30 stores data as shown in FIG. That is, the channel selection button number and the corresponding frequency division value are recorded. This frequency division value is data for determining the receiving frequency as described later. That is, in this embodiment, the frequency division value is used as the channel selection information.

First, the preset operation will be explained with reference to the flowchart shown in FIG. When the power switch 6 in FIG. 3 is turned on, the normal reception mode is entered (step S1). Next, the memory card 30 is inserted into the insertion section 44 of the electronic tuning device 1. memory card 3
When 0 is inserted, the internal switch 42
is closed (step S2). When the switch 42 is closed, a preset mode is entered. In the preset mode, the CPU 12 starts reading out the channel selection button number and the corresponding frequency division value recorded on the memory card 30 (step S3). When reading starts, "READSTART" is displayed on the display 2 (step S3). Then, the CPU 12
Store the read data in the RAM 16 (step S
4). When reading and storing are completed, “R” appears on the display 2.
"EAD END" is displayed (step S5). Next, when the memory card 30 is pulled out from the insertion section 44,
The switch 42 will be opened (step S6). As described above, the data shown in FIG. 5 is stored in the RAM 16, and the presetting is completed.

Next, the reception operation will be explained. When the memory card 30 is removed and the switch 42 is opened, the normal reception mode is entered (step S7). In this state, first press the desired channel selection button. Here, it is assumed that the channel selection button CH2 has been pressed. Based on this channel selection command, the CPU 12 reads the frequency division value corresponding to the channel selection button CH2 from the RAM 16 and sends it to the programmable frequency divider 52. Programmable frequency divider 52 divides the output of VCO 56 according to a given frequency division value. The output of programmable frequency divider 52 is provided to one input of phase comparator 50. A crystal oscillator 46 is connected to the other input of the phase comparator 50.
An output obtained by frequency-dividing the output of the frequency divider 48 is provided. The phase comparator 50 outputs the phase difference between both inputs. This output is passed through a low pass filter 54 to the VCO
56 control inputs. Therefore, VCO56
The output frequency fR from the frequency divider 48 is controlled so that the frequency fV' obtained by dividing the oscillation frequency fV by the frequency division value D2 from the CPU 12 is equal to the output frequency fR from the frequency divider 48. That is, V
The oscillation frequency fV of CO56 is expressed by the following formula.

fV=D2·fR Therefore, by changing the frequency division value, the oscillation frequency fV of the VCO 56 can be changed. VCO56
The output of is given to the frequency mixing circuit 58. As a result, an intermediate frequency signal is extracted from the frequency mixing circuit 58. This intermediate frequency signal passes through an intermediate amplifier circuit 62 and is detected by a detection circuit 64. The detected and demodulated signal is amplified by the amplifier 66 and then output from the speaker.

The case where the channel selection button CH2 is pressed has been described above, but the desired broadcasting station is selected in the same manner when any other channel selection button is pressed.

Note that by inserting another memory card 30 with a different stored frequency division value, it is possible to preset to a station of another frequency. Therefore, in a car radio or the like, if a memory card 30 is prepared for each region, presetting can be easily performed.

[0020]Although the above embodiments have been described with respect to a radio, the present invention may also be applied to a television or the like.

Further, in the above embodiment, the frequency division value is used as the channel selection information, but the frequency may also be used as the channel selection information.

[0022]

In the electronic tuning device according to the present invention, the tuning information stored on the card is read out by the reading means and stored in the storage means. This presets the receiving station. Therefore, it is not necessary to perform a presetting operation for each station, and presetting can be easily performed even when there is no desired radio wave, such as when an antenna is disconnected or in a place where radio waves are difficult to reach.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an electronic tuning device that is an embodiment of the present invention.

FIG. 2 is a block diagram of an electronic tuning device that is an embodiment of the present invention.

FIG. 3 is an external view of an electronic tuning device that is an embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the CPU 12.

FIG. 5 is a diagram showing data recorded on a memory card according to an embodiment of the present invention.

FIG. 6 is an external view of a conventional electronic tuning device.

FIG. 7 is a diagram showing the hardware configuration of a conventional electronic tuning device.

[Explanation of symbols]

30...Memory card 32...Reading means 34...Memory means 36...Tuning control means 38...Tuition selection circuit

Claims (1)

[Claims] Claims 1: Reading means for reading out the tuning information recorded on the card; storage means for storing the tuning information read out from the card by the reading means; An electronic tuning device comprising: a tuning control means for reading station information from a storage means and applying it to a tuning circuit; and a tuning circuit for selecting a station based on the given tuning information.