JP2529367B2 - Electronic tuner - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electronic tuner used for a car radio and the like.

"Prior Art" In this type of electronic tuner, for example, 1, 2, 3,
Multiple preset keys with numbers displayed like ...
A memory corresponding to each preset key is provided, and frequency data corresponding to a station is preset by the user in this memory. When any one of the preset keys is pressed, the frequency data in the memory corresponding to that key is set in the programmable divider of the PLL circuit, and the station is selected.

[Problems to be Solved by the Invention] In the conventional electronic tuner described above, when it is desired to listen to a station that is always being listened to, a preset key number corresponding to the station (stored in advance by the user) It was troublesome to find and press. Also, if the user forgets the key number, he has to press the preset key one by one to search for the station.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an electronic tuner that can immediately select a station that is always listening.

"Means for Solving the Problem" The present invention has a first memory in which a plurality of frequency data respectively assigned to a plurality of preset keys are stored, and is selected based on the frequency data in the first memory. In an electronic tuner for broadcasting, a second memory in which the frequency of use of each preset key is stored and an order of a plurality of frequency data assigned to each preset key are stored in the second memory. It is characterized by further comprising a control means for rearranging the frequency data stored in the first memory and clearing the data in the second memory so that the frequency data stored in the first memory are arranged in the order of the frequency of use.

[Operation] According to the present invention, the stations with the highest frequency of use of the preset keys stored in the second memory are arranged, for example, in ascending order of the preset key numbers. As a result, if the preset keys are selected in ascending order of the key numbers, the stations having the highest frequency of use can be received in order.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an electronic tuner of a car radio according to an embodiment of the present invention.

In this figure, reference numeral 1 is an antenna for receiving radio waves transmitted from each station. 3 is a high frequency amplifier circuit, a mixing circuit,
It is a front-end part consisting of a local oscillator circuit,
A signal corresponding to the user's station selection is amplified from the high frequency signal S1 received by the antenna 1 with a good S / N, and this signal is converted into an intermediate frequency signal S2 by frequency conversion. 5
Is an intermediate frequency amplifier for amplifying the intermediate frequency signal S2. Reference numeral 7 denotes a detection / demodulation unit that detects the intermediate frequency signal S2 amplified by the intermediate frequency amplification unit 5 and extracts a low frequency signal. Then, the demodulated signal is output to an external speaker or the like via the output terminal 9. 11 is the intermediate frequency signal S2
It is a level detector that detects the amplitude of.

13 is a reference signal generator, phase comparator, VCO (voltage cont
is a PLL circuit composed of a rolled oscillator), a programmable divider, etc., and frequency data from a control unit 17 described later is set in the programmable divider,
The frequency of the local oscillator circuit of the front end unit 3 is locked to the frequency desired by the user.

Reference numeral 15 denotes an operation unit, which includes a power switch 15a for turning the power on and off, eight preset keys 15b on which numbers 1 to 8 are printed on the surface, and which indicates a station set by the user in advance.
It has a memory-in key 15c for the user to set a station to the preset key 15b, a seek key 15d for selecting a station in order from the one with the lowest frequency, and the like.

Reference numeral 17 denotes a control unit, which includes a CPU (central processing unit), a ROM in which a program used in the CPU is stored, a data recording memory 17a, and an I / O port. As shown in FIG. 2, each preset key 15b is stored in the memory 17a.
A block [B1] in which frequency data is stored and a block [B2] in which the frequency of use is stored are respectively provided corresponding to the numbers. The data stored in the memory 17a is always backed up by the battery.

Next, the operation of this embodiment having the above configuration will be described. It is assumed that the block [B1] of the memory 17a has frequency data set therein and the block [B2] has been cleared.

When the driver wants to listen to the car radio, first turn on the car radio power supply 15a with the accessory switch on.
And press any of the preset keys 15b.

Now, for example, if the third preset key 15b is operated, the CPU detects this and first reads the frequency data from the storage position of the block [B1] corresponding to the key number 3 and sets it in the PLL circuit 13. Then the same key number 3
The data in the storage position of the block [B2] corresponding to is incremented. As a result, the data in the storage area becomes 1. Next, for example, assume that the user operates the preset key No. 5. In this case, the CPU first reads the frequency data of the block [B1] corresponding to the 5th key, and then increments the data of the storage position of the block [B2] corresponding to the same key number 5.

Hereinafter, every time the driver operates the preset key 15b, the frequency data is set and the data in the area of the block [B2] is incremented. Here, the data of the block [B2] represents the frequency of use of the corresponding preset key 15b.

Next, when the driver gets out of the car, the accessory switch is turned off. When the accessory switch is turned off, the CPU rearranges the frequency data of the block [B1] in the order of frequency of use of the block [B2]. In this case, the frequency data most frequently used is stored in the storage area of the block [B1] corresponding to the smallest number of the preset keys 15b. Next, the CPU uses the block [B
2) Clear each data.

As described above, according to the above-described embodiment, the frequency data of the block [B1] is replaced in descending order of frequency of use each time the accessory switch is turned off. Therefore, by pressing the numbers of the preset keys 15b in ascending order, it is possible to select the stations in order of frequency of use.

In the above embodiment, each time the preset key 15b is pressed, the data stored in the block [B2] of the memory 17a is incremented by 1, and the data is stored in the block [B1] in descending order. The frequency data was rearranged, but in addition, each time the preset key 15b was pressed and the station was received, the cumulative reception time of the stations is stored in block [B2], and The frequency data of the block [B1] may be rearranged in order.

Further, in the above embodiment, the frequency data of the block [B1] of the memory 17a is rearranged when the accessory switch is turned off. Block once a week [B
The frequency data of [1] may be rearranged.

Further, in the above embodiment, the stations that are frequently used in the preset key 15b are arranged in the ascending order of the numbers of the preset keys 15b.
May be arranged in descending order of number.

Further, in the above embodiment, the present invention is applied to the electronic tuner for FM reception, but in addition, it may be applied to the electronic tuner for AM reception, the electronic tuner for AM / FM reception, etc. .

[Effects of the Invention] As described above, according to the present invention, the second memory in which the frequency of use of each preset key is stored, and the order of a plurality of frequency data assigned to each preset key is the above-mentioned order. Since the frequency data stored in the first memory are rearranged so that the frequency data stored in the second memory are arranged in the descending order of frequency of use, the control means for clearing the data in the second memory is provided. By calling the preset keys in the order of their key numbers, it is possible to listen in order from stations that are frequently used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic tuner of a car radio according to an embodiment of the present invention, and FIG. 2 is a diagram showing a storage state in a memory applied to the embodiment of the present invention. 15b …… Preset key, 17 …… Control means, 17a …… Memory.

Claims (1)

(57) [Claims] 1. An electronic tuner having a first memory in which a plurality of frequency data respectively assigned to a plurality of preset keys are stored, and selecting a channel based on the frequency data in the first memory, Secondly, the frequency of use of each of the preset keys is stored.
Memory and the frequency data stored in the first memory are arranged such that the order of the plurality of frequency data assigned to each of the preset keys is the most frequently used order stored in the second memory. And a control means for clearing the data in the second memory, and an electronic tuner.