JPH0620171B2 - Preset tuning method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a preset channel selection method that can be suitably implemented in a vehicle-mounted radio receiver and the like. More specifically, the present invention relates to a preset channel selection method. The preset tuning method that is used.

2. Description of the Related Art Recently, electronically tuned radio receivers have information corresponding to the reception frequency of broadcasting stations (hereinafter referred to as "station designation information").
Is stored in a memory set corresponding to a predetermined button, and by operating the button, a reception signal from a broadcasting station corresponding to the stored station designation information can be received. There is a function that can. Generally, the function is called a preset function, the button is called a preset button, and the memory is called a preset memory. Further, in particular, in addition to the preset function, a function including a function of automatically selecting a receivable broadcasting station and storing it in a preset memory corresponding to the preset button is called an auto preset function. Normally, one preset button has a preset memory in two areas, and each preset memory has a different frequency band (for example, frequency modulation (hereinafter referred to as "FM") for broadcasting and amplitude modulation (hereinafter referred to as "AM"). "
Say. The station designation information (for broadcasting) is set so that one station is stored for each station.

The procedure for storing the station designation information by the auto-preset function (hereinafter referred to as "auto-preset operation") is as follows. The reception frequency of a broadcasting station having a defined electric field strength level is detected. Station designation information that correlates with the detected reception frequency (for example, phase lock loop (hereinafter "PL
L ”. ) The frequency division ratio N value of the programmable divider constituting the circuit) is sequentially stored in the preset memory corresponding to each preset button.

FIG. 6 is a diagram showing the relationship between the reception frequency of each broadcasting station and the electric field strength of the received signal in a certain area. Stations A to I on the horizontal axis show the received signal level from each broadcasting station. The auto-preset operation will be described with reference to FIG. 6, assuming that the number of preset memories is 6 areas and the frequency band is FM.

According to the auto-preset operation, a predetermined frequency band is swept to detect broadcasting stations at the first level or higher, and if the number does not reach the preset memory number, the second sweep is performed to set the second level. Above, the broadcast stations below the first level are detected, and if they are still insufficient, the third sweep is performed to detect the broadcast stations above the third level and below the second level. Of the receivable broadcasting stations obtained in this manner, for example, the one having a strong electric field strength and the earliest sweep order are selected in order, and the station designation information of the selected broadcasting station is stored in the preset memory. In the example of FIG. 6, the correspondences are as shown in Table 1. After that,
By operating each preset button, each registered station can receive.

The station designation information once stored in the preset memory may be rearranged according to the frequency.

However, recently, the number of broadcasting stations is increasing, and there is a tendency that the number of preset memories for setting the broadcasting stations of about 6 stations is not enough. For example, in Japan, there are only a few FM broadcasting stations in various regions, but in other countries,
In some areas, there are over a dozen FM stations. For example, in the area shown in FIG. 6, nine broadcasting stations, station A to station I, are set, but according to the above-mentioned auto preset operation, only the broadcasting stations shown in table 1 should be registered. I can't. That is, the E station where the electric field strength of the received signal is weak,
Stations C and H cannot be registered.

In order to solve the above problems, the number of preset memories should be increased. Normally, as described above, one preset button is set to one preset memory area for storing one station for each frequency band. Therefore, increasing the number of preset buttons paired with the preset memory can solve the above-mentioned problem in the simplest manner. However, particularly in a case where miniaturization is required such as a car radio receiver, the number of parts increases, the space utilization efficiency decreases, and the like, which is a less preferable solution.

Therefore, in order to solve the above-mentioned problem, it has been proposed to increase the number of preset memories set corresponding to each preset button without changing the number of preset buttons. That is, for one preset button, for example, in the frequency band of FM, the first area FM and the second area FM
Providing a preset memory for two areas like the area FM2,
Also in the AM frequency band, the first area AM1, the second area
Like the area AM2, two areas of preset memory are provided to form a storage area. Therefore, the number of preset memories for each frequency band is increased without increasing the number of preset buttons, and it is possible to cope with multi-channel broadcasting stations. In addition,
At the time of reception, 2 registered in one preset button
When any one of the broadcasting stations of the stations is selected, the area FM is selected by an area selection button provided in advance.
After selecting 1 and FM2, the preset button may be operated.

Two methods have been proposed for the auto-preset operation for multiple areas of the preset memory. In the following, description will be given with reference to FIG. 6, assuming that there are six preset buttons and the frequency band is FM.

(1) Continuous auto-preset operation According to the continuous auto-preset operation, the auto-preset operation is performed over the entire area of the preset memory for each frequency band. That is, the station designation information of the broadcasting station detected as described above is first stored in the first area FM1 of the preset memory in the order of preset buttons. After the data is stored in all the first areas FM1, it is subsequently stored in the second area FM2 of the preset memory in the order of the preset buttons. When the broadcasting station shown in FIG. 6 is stored by the continuous auto-preset operation, the broadcasting station is registered in each area FM1 and FM2 of the preset memory corresponding to each preset button as shown in Table 2.

(2) Individual auto-preset operation According to the individual auto-preset operation, the auto-preset operation is individually performed for each of the areas FM1 and FM2 of the preset memory.

Problems to be Solved by the Invention As described above, the continuous auto-preset operation and the individual auto-preset operation have been proposed as the auto-preset operation for the multiple areas of the preset memory.

According to the former, as shown in Table 2, when the number of broadcasting stations is larger than the number of preset buttons (7 to 12 in this conventional example).
However, all broadcasting stations can be registered with a single auto-preset operation. However, as in the case of the individual auto preset operation, each area FM1, F of the preset memory is
It is not possible to use M2 individually. That is, for example, when the number of broadcasting stations is smaller than the number of preset buttons, the second area FM2 is stored even if the first area FM1 is used to register the broadcasting station in the area where daily life is performed. There is no empty area. Therefore, it is not possible to register a broadcasting station in an area other than daily life in the second area FM2, which is an empty area, without changing the contents of the first area FM1 when going out.
Therefore, it is necessary to perform the auto presetting operation for each area, which is low in convenience and inferior in operability.

On the other hand, the latter (individual auto-preset operation) can solve the above-mentioned problems and can be effectively used for each of the areas FM1 and FM2 of the preset memory.

However, in the latter case, the number of preset buttons and the number of preset memories are the same, and only two configurations are provided. That is, for example, in the area having the broadcasting station shown in FIG. 6, even if the auto presetting operation is performed on the areas FM1 and FM2, the areas FM1 and FM2
The broadcast stations shown in Table 1 will be registered in each. Therefore, when the number of preset buttons and the number of preset memories are the same, the problem of occurrence of unregistered broadcasting stations when there are many broadcasting stations cannot be solved. However, this problem can be solved by the former (continuous auto-preset operation).

Therefore, according to each of the above auto preset operations,
Each has its own problems, but when one of the auto-preset operations is performed, the problems of the other auto-preset operation can be solved. Also, each problem tends to occur under different conditions (difference in the number of broadcasting stations). That is, when a problem corresponding to one auto-preset operation occurs in one auto-preset operation, selecting the other auto-preset operation causes the problem of the one auto-preset operation. While being solved, the problem of the other auto-preset operation hardly occurs. Conventionally, there is no channel selection method that combines the above-mentioned auto-preset operation, and therefore,
If the auto preset operation can be selected and used by the operator, the convenience as a channel selection system is significantly improved.

The first conceivable solution is to add a selection button on the operation panel so that the auto preset operation can be selected and to switch the operation according to the button operation. However, as mentioned above, it is not preferable to add a button on the operation panel of a vehicle-mounted radio receiver or the like, which requires miniaturization, because it leads to an increase in the number of parts and a decrease in space utilization efficiency. There is a problem that the number of button operations increases and the operability deteriorates.

An object of the present invention is to provide a preset channel selection method capable of performing a preset write operation with improved convenience.

Means for Solving the Problems According to the present invention, a plurality of groups of storage areas are provided for one or a plurality of frequency bands individually corresponding to a plurality of preset switches, and each storage area is selected. In the preset channel selection method that enables preset writing / reading for each group and receives radio broadcasting at the preset read frequency, when the simultaneous write operation is performed, the selected group and its group are If there is a frequency that has already been preset written in any of the storage area portions with other groups in the same frequency band, the received electric field strength is at a predetermined level in each storage area portion of only the selected group. The above frequencies are swept to sequentially perform preset writing, and when the simultaneous write operation is performed, the selected group and the group If there is no preset-written frequency in all storage areas of the same frequency band, the storage area of the selected group and the storage area of another group of the same frequency band The preset channel selection method is characterized by sequentially sweeping frequencies having a received electric field strength equal to or higher than a predetermined level and performing preset writing.

Operation According to the present invention, a so-called preset memory, which is a storage means for storing the preset frequency, is composed of a plurality of storage area portions. A plurality of storage areas are provided for each of the plurality of preset switches.
Each of one or more frequency bands is further divided into a plurality of groups.

That is, for example, four frequency bands AM1, AM2, FM1 and FM2 are assigned to each of the six preset switches, and a storage area portion is provided corresponding to each band. AM1, AM
Preset writing / reading is possible for each group such as 2, FM1, FM2.

In such a configuration, when a simultaneous write operation called so-called auto preset is performed, all the data stored in the group selected at that time, for example, AM1 and another group AM2 having the same frequency band as that group are stored. It is judged whether or not there is already a preset-written frequency in any of the area portions, and if there is even one written frequency, the preset portion is set in each storage area portion of only the selected group AM1. A write operation is performed.

The preset write operation is an operation of sweeping a frequency at which the received electric field strength is equal to or higher than a predetermined level and sequentially writing to each storage area.

On the other hand, if there is no preset-written frequency in all the memory areas of the selected group AM1 and the other group AM2 in the same frequency band as that group, the memory of the selected group AM1 is stored. The preset write operation is performed over the area portion and the storage area portion of another group AM2 in the same frequency band.

Therefore, the number of preset switches is six as described above, and two groups AM1 and AM2 are provided in one frequency band.
Is set, either group AM1
Alternatively, when there is a preset station in AM2, the preset write operation is performed only in the selected group, that is, up to 6 stations. On the other hand, when there is no broadcasting station in which preset writing is performed in both groups AM1 and AM2, these groups AM1 and AM2
Through, that is, up to 12 stations, the preset write operation is performed.

In this way, the preset write operation can be selected depending on whether or not there are already preset stations, and convenience can be improved.

Embodiment FIG. 1 is a block diagram showing the electrical construction of a radio receiver 1 for carrying out a preset channel selection method according to an embodiment of the present invention. The radio receiver 1 can receive the reception signal in each frequency band of the FM reception signal and the AM reception signal. Hereinafter, first, a configuration for receiving the FM reception signal will be described.

The FM reception signal received by the antenna 2 is received by the FM detection unit 3
Is input to the FM front end circuit 4. The FM front end circuit 4 tunes and amplifies the received FM reception signal, and inputs it to the FM mixing circuit 5.
An FM local oscillator circuit 6 is provided in association with the FM mixing circuit 5, and the FM reception signal is generated by the FM mixing circuit 5.
At, the intermediate frequency signal is exchanged, and this intermediate frequency signal is given to the FM detection circuit 8 via the FM intermediate frequency amplification circuit 7 and converted into an acoustic signal. A noise component is removed from the acoustic signal from the FM detection circuit 8 via the noise canceller 9, and the acoustic signal is input to the matixer 10. In the multiplexer 10, the input acoustic signal is separated into left and right acoustic signals for stereo broadcasting, and the FM / AM output unit 11
Is sent to the signal switching circuit 12.

In the signal switching circuit 12, the FM acoustic signal from the FM detection unit 3 and the AM acoustic signal from the AM detection unit 13, which will be described later, are switched and selected, and given to the adjustment circuit 14. Adjustment circuit 14
Then, the sound quality and volume of the input FM sound signal are adjusted by a graphic equalizer, amplified by the amplifier circuit 15, and sonicated by the speakers 16a and 16b.

The oscillation signal from the FM local oscillation circuit 6 is also given to the PLL partial circuit 18 of the processing device 17 including a microcomputer. The PLL partial circuit 18 is
It is a partial circuit that constitutes a PLL circuit described later, and is configured by including a prescaler 19, a programmable divider 20, and a phase comparison circuit 21.

The oscillation signal from the FM local oscillation circuit 6 input to the PLL partial circuit 18 is frequency-divided by the prescaler 19 at a constant frequency division ratio (for example, 10) and given to the programmable divider 20. The programmable divider 20 frequency-divides the input signal from the prescaler 19 with a frequency division ratio N corresponding to a control signal from the control circuit 22 formed in the processing device 17, and supplies it to the phase comparison circuit 21.

The phase comparison circuit 21 includes the programmable divider 20.
And the phase of the reference signal having a preset frequency are compared and output to the low-pass filter circuit 23. The low-pass filter circuit 23 waves the signal from the phase comparison circuit 21, generates a control voltage according to the signal from the phase comparison circuit 21, and outputs the FM front-end circuit 4
And the oscillation frequency of the FM local oscillation circuit 6 are controlled. As described above, the FM local oscillation circuit 6, the PLL partial circuit 18, and the low-pass filter circuit 23 constitute a so-called PLL circuit.

In this PLL circuit, the oscillation signal from the FM local oscillation circuit 6 is 10 by the prescaler 19 and the programmable divider 20 based on the value of the control signal derived from the control circuit 22 (hereinafter referred to as “N value”). The frequency is divided by a frequency division ratio of × N and given to the phase comparison circuit 21. The reference frequency of the preset reference signal is, for example, 10
The low-pass filter circuit 23 includes the FM front-end circuit 4 and the FM local oscillation circuit so that the frequency of the reference signal and the frequency of the frequency-divided FM local oscillation signal from the programmable divider 20 match. 6 can be controlled, and thus the FM receiving operation can be performed at the frequency corresponding to the N value from the control circuit 22.

As described above, it is determined whether the receiving operation is performed at the receiving frequency set by the control circuit 22. The FM intermediate frequency amplifier circuit is input to the input processing circuit 24 set in the processing device 17. This can be done by detecting and processing the output signal level from 7 and the station detect signal.

When the reception frequency of the receivable broadcasting station is detected from the above-mentioned output signal level and station detection signal during the auto-preset operation described later, the control circuit 22 controls the programmable divider 20 at the time of detection. The N value which is a signal is stored in a random access memory (hereinafter referred to as “RAM”) 25 provided in the control circuit 22.
That is, the N value corresponds to the station designation information. In addition to this, the control circuit 22 controls, for example, arithmetic processing and each circuit operation. Further, the control is performed based on the operation of a button switch (for example, a preset button) provided on the key input device 26.

The control signal from the control circuit 22 is also output to the output processing circuit 27.
To the display device 28 and the power supply circuit 29.
The display device 28 displays, for example, the reception frequency of the receivable broadcasting station detected as described above, and also has a clock function and the like. In the power supply circuit 29, the battery B, the accessory contact (ACC) of the ignition switch, and the ground potential (G) based on the input control signal.
The supply voltage for operating each of the devices and circuits is generated from the voltage level of (ND) and supplied to each of the devices and circuits. Further, the voltage level information of the power supply circuit 29 is given to the control circuit 22 via the input processing circuit 24, and the voltage level is monitored, for example.

The radio receiver 1 can also receive the AM reception signal as described above. That is, A received by the antenna 2
The M reception signal is given to the AM detection unit 13. The AM reception signal input to the AM detection unit 13 is tuned / amplified by the AM front end circuit 30 and given to the AM mixing circuit 31. An AM local oscillation circuit 32 is provided in association with the AM mixing circuit 31, and the AM reception signal is
The M mixing circuit 31 converts the intermediate frequency signal into an intermediate frequency signal.
It is given to the detection circuit 34 and converted into an acoustic signal. AM
The acoustic signal from the detection circuit 34 is then transmitted from the speaker 16 as an acoustic signal via the FM / AM output unit 11.

Further, the AM local oscillator circuit 32 includes a PLL partial circuit 18
And the low-pass filter circuit 23 constitute a PLL circuit. With this PLL circuit, as with the FM detection unit 3, the tuning frequency of the AM front end circuit 30 and the AM
The oscillation frequency of the local oscillation circuit 32 is controlled. Further, the determination as to whether or not the AM reception operation is being performed at the reception frequency is made by detecting the output signal level and the station detection signal from the AM intermediate frequency amplification circuit 33 input to the processing device 17. be able to.

FIG. 2 is a diagram showing the memory map 35 of the RAM 25. The memory map 35 is divided into different frequency bands (FM and AM in this embodiment). The division of the storage area in the FM frequency band will be described below.

The FM memory frequency band memory map 35FM has a frequency band area TFM for storing a plurality of the station designation information (N values),
For example, it is constituted by a flag PIFFM indicating whether or not the station designation information is stored even in one area in the frequency band area TFM. The frequency band region TFM is a region Q1 corresponding to each preset button (6 in this embodiment) P1 to P6.
To Q6, and each of the areas Q1 to Q6
Are divided into unit storage areas Q (FM1) and Q (FM2) which are a plurality of groups (two areas in this embodiment).
That is, in the frequency band area TFM, the preset memory Qi (FM1), which is a storage area portion of two areas, corresponding to each preset button Pi (i = 1 to 6),
Qi (FM2) is assigned and has a total of 12 areas.

The flag PIFFM is set to, for example, the set state when the station designation information is stored in any one of the 12 areas. That is, if the station designation information is not stored in any area, it is in the reset state.

On the other hand, the memory map 35AM in the AM frequency band is also the F
It has the same structure as the memory map 35FM in the M frequency band. The areas corresponding to the memory maps 35FM and 35AM are indicated by reference numerals FM and AM in the drawing of FIG.
Are divided by substituting. According to the above-mentioned area division, in the present embodiment, preset memory for storing the station designation information of a total of four broadcasting stations of FM2 station and AM2 station is allocated to each of the preset buttons P1 to P6,
It has a total of 24 areas. When any one of the four broadcasting stations registered in one preset button is selected at the time of reception, the unit storage area Q (FM1 ), Q (FM
2), Q (AM1), Q (AM2) are selected, and then the preset button may be operated.

The auto preset operation in the radio receiver 1 will be described below. The frequency band in which the auto preset operation is to be performed is selected, for example, by operating a button, and then the auto preset button is operated to start the auto preset operation. When the operation starts, the reception frequency of the receivable broadcasting station from the lower limit frequency to the upper limit frequency is swept in the selected frequency band. The sweep of the reception frequency is performed based on the output signal level from the intermediate frequency amplification circuit and the station detection signal by sequentially changing the N value input from the control circuit 22 to the programmable programmable divider 20 as described above. From the output signal level,
When the reception frequency of a broadcast station having a predetermined level of electric field strength of the received signal, that is, a receivable broadcast station is detected, the N value at the time of detection is transferred to the preset memory Q in the RAM 25 in the control circuit 22 in the order of preset buttons. Remembered.

The preset memory Qi (FM
In the present embodiment, the continuous auto-preset operation and the individual auto-preset operation can be selectively performed for the frequency band region composed of 1) and Qi (FM2). Each operation is selected based on the storage state of the preset memory in the frequency band region in which the operation is to be performed.

That is, if the storage state in the frequency band region is a state in which the station designation information of one station is not registered (hereinafter referred to as "initial state"), the continuous auto-preset operation is performed in the frequency band region. . On the other hand, if the storage state is not the initial state, the individual auto-preset operation is performed in the selected unit storage area of the frequency band area. The selected unit storage area is a unit storage area including a preset memory which is set to be readable by operating the preset buttons P1 to P6 in the receiving state. The storage state is determined, for example, by the above-mentioned flag PIF.

FIG. 3 is a diagram showing the relationship between the reception frequency of the broadcasting station and the electric field strength of the reception signal in an area different from the area shown in FIG. It is assumed that the reception frequencies of the broadcasting stations J to N shown in FIG. 3 are included in a frequency band substantially the same as the frequency band of FIG.
An embodiment of the channel selection system of the present invention will be described with reference to the drawings.

First, it is assumed that the FM frequency band area TFM of the RAM 25 is in the initial state and is running in the area shown in FIG. The operator selects the FM frequency band area in the preset memory and performs the auto preset operation in order to register the FM broadcasting station in the area. When the auto preset button is operated, the flag TIFFM in the RAM 25 is confirmed. Any preset memory Qi (FM1),
Since the station designation information is not registered in Qi (FM2) either, it is in the flag PIFFM reset state. Therefore,
The auto-preset operation to be performed from now on is performed by the continuous auto-preset operation for the preset memory Q. That is, the station designation information (N value) of the receivable broadcasting station detected is stored in the preset memory Q corresponding to the preset buttons P1 to P6 in the first unit storage area Q (FM1).
1 (FM1) to Q6 (FM1) are registered in that order, and when there are still receivable broadcast stations, the preset memory Q1 (corresponding to the preset buttons P1 to P6 in the second unit storage area Q (FM2) is displayed. FM2) to Q6 (FM
2) Registered in order. That is, the broadcasting stations registered in the preset memory Q are associated as shown in Table 2 above.

Therefore, even in an area having more broadcasting stations than the number of preset buttons, the station designation information of the broadcasting stations can be registered, which is highly convenient as a channel selection method.

When at least one station designation information is registered by the above-described auto preset operation, the flag PIFFM is set from the reset state to the set state. Therefore, when the auto-preset operation is performed thereafter, the individual auto-preset operation is performed after any one of the unit storage areas Q (FM1) to Q (FM2) is selected.

For example, when traveling to the area shown in FIG. 3 in a state of being associated and registered as shown in Table 2, consider registering a broadcasting station in this area. When the second unit storage area Q (FM2) is selected by the area selection button or the like in the receiving state while traveling in this area, the second unit storage area Q (FM2) is selected by the individual auto-preset operation. The preset memory Q1 (FM) of the unit storage area Q (FM2)
2) to Q6 (FM2), station designation information of broadcasting stations in this area can be registered. That is, the broadcasting stations registered in the preset memory Q are associated with each other as shown in Table 3.

On the other hand, when the first unit storage area Q (FM1) is selected, similarly, the auto-preset operation is performed only on the first unit storage area Q (FM1). That is, it is registered in the preset memory Q. The broadcasting stations are associated as shown in Table 4.

Therefore, the individual auto-preset operation can be performed for each unit storage area that can be arbitrarily selected, the preset memory can be used meaningfully, and the convenience as a channel selection system is significantly improved.

By providing a reset function or the like so that the registered station designation information can be erased, the continuous auto-preset operation can be performed again. As described above, the auto preset operation selection can be performed according to the storage state in the preset memory, and unnecessary operation buttons and the like are not required. Therefore, the operability in the tuning system is significantly improved.

FIG. 4 is a flow chart showing the selection control of the preset memory by the auto preset operation. This program is started by operating the auto preset button in the receiving state.

When the program starts, it is determined in step m1 whether or not the reception frequency currently being received is the frequency band of FM. If it is determined that FM is currently received, the process proceeds to step m2 to check the flag PIFFM indicating the storage state of the FM frequency band region in the preset memory, and the FM frequency band region is in the initial state. Is determined. If it is determined that the area is in the initial state, the process proceeds to step m3, and the first unit memory area Q (FM1) is associated with each preset button.
Then, the auto preset operation is performed through the second unit memory area Q (FM2), and the process proceeds to step m4. Step m
In No. 4, when the station designation information of at least one station is registered in the frequency band region of the FM, the flag PIFFM is set to the set state, the initial state of the frequency band region is released, and the process ends.

On the other hand, in step m2, if it is confirmed that the flag PIFFM is in the set state and it is determined that the frequency band region of the FM is not in the processing state, the processing is in step m5.
Go to. At step m5, whether or not the reception frequency currently being received is based on the station designation information registered in the first unit storage area Q (FM1), that is, the first unit storage area as the unit storage area. It is determined whether or not Q (FM1) is selected. When it is determined that the first unit storage area Q (FM1) is selected for the frequency, the process proceeds from step m5 to step m6. At step m6, the auto-preset operation is performed only for the first unit storage area Q (FM1), and the processing is ended.

At step m5, the first unit storage area Q (F
If it is determined that M1) is not selected, the process proceeds to step m7. At step m7, it is determined that the selected storage area is currently the second unit storage area Q (FM2), the auto preset operation is performed only in the second unit storage area Q (FM2), and the processing is terminated. .

On the other hand, if it is determined in step m1 that the reception frequency currently received is not in the FM frequency band, the process proceeds to step m8. Thereafter, in steps m8 to m13, the same processing as that performed on the preset memory in the FM frequency band in steps m2 to m7 is performed on the preset memory in the AM frequency band.

Further, the station designation information is not automatically registered in the preset memory Q, but the station designation information may be registered one station by one for the reception frequency desired by the operator (hereinafter referred to as "manual preset operation"). FIG. 5 is a flow chart showing the writing control to the preset memory by the manual preset operation. This program is started, for example, by operating a preset function button or the like.

In step s1, a preset memory is set corresponding to the operated preset button in order to register the station designation information set manually, and in step s2,
For example, the station designation information (N value) set by the tuning knob (or tuning up / down switch) is written in the preset memory. Thereafter, the processing proceeds to step s3, where the written preset memory is FM.
It is determined whether or not the frequency band is included in the frequency band region of.
If it is included in the FM frequency band region, the process proceeds to step s4, where at least one of the FM frequency band region is included.
Since the writing process has been performed in the preset memory of the area, processing such as setting the flag PIFFM to the set state is performed to cancel the initial state of the FM frequency band area.

In step s3, if the written preset memory is not included in the FM frequency band region,
The process proceeds to step s5. At step s5, it is judged that the preset memory in which the station designation information is written is a preset memory in the AM frequency band region, and the flag PIFAM is set to the set state in the same manner as described above, and the AM frequency band is set. If the initial state of the area is released and then the preset function button is operated again, this program ends.

As described above, according to the present embodiment, if the storage state of the frequency band region is the initial state, the auto-preset operation can be performed over the entire region, and the station designation information of the broadcasting station to be registered is large. You can register. If the frequency band area is not in the initial state, the auto-preset operation can be individually performed for each unit storage area that constitutes the predetermined area, so that each storage area can be used meaningfully. The convenience as a station system is significantly improved. Further, the selection button for selecting the auto-preset operation is not required, and the operability in the channel selection system is significantly improved. According to the present invention, the station designation information sequentially selected by the auto-preset operation is , According to the order of electric field strength within a predetermined level and in the order of upstream side in the sweep direction of the reception frequency. However, as another embodiment, the electric field strength of each broadcasting station may be stored by sweeping once in the frequency band and registered in order of electric field strength. Further, the station designation information once stored in the preset memory may be rearranged according to the reception frequency.

As described above, the preset write operation can be selected according to whether or not there is a station that has already been preset.
The convenience can be improved.

In addition, since the writing operation is selected according to the storage state in the preset memory without using buttons or the like, an increase in the number of parts and a decrease in space utilization efficiency are not caused, and further unnecessary operation is not performed. Will not increase.

[Brief description of drawings]

FIG. 1 is a block diagram showing a simplified electrical configuration of a radio receiver 1 for carrying out a preset channel selection method according to an embodiment of the present invention, and FIG. 2 is a diagram showing a memory map 35 of a RAM 25. FIG. 3 is a diagram showing the relationship between the reception frequency of the broadcasting station and the electric field strength of the reception signal in an area different from the area shown in FIG. 6, and FIG. 4 shows the selection control of the preset memory by the auto preset operation. Flow chart, FIG. 5 is a flow chart showing the writing control to the preset memory by the manual preset operation, and FIG. 6 is a diagram showing the relationship between the reception frequency of the broadcasting station and the electric field strength of the reception signal in a certain area. . 1 ... Radio receiver, 22 ... Control circuit, 25 ... RA
M, 35 ... Memory map, FM, AM ... Frequency band, Q (FM1), Q (FM2), Q (AM1), Q
(AM2) ... Unit storage area, Qi ... Preset memory, Pi ... Preset button, TFM, TAM ... Frequency band area

Claims (1)

[Claims] 1. A plurality of groups of storage areas are provided for each of a plurality of frequency bands individually corresponding to each of the plurality of preset switches, and each storage area portion is preset for each selected group. In a preset channel selection method that enables writing / reading and receives a radio broadcast at a preset read frequency, when a simultaneous write operation is performed, the selected group and other groups of the same frequency band as the group are selected. If there is a preset frequency in any of the storage areas of the group, the frequency of the received electric field strength is swept over a predetermined level in each storage area of only the selected group. When the simultaneous write operation is performed, the selected group and other groups in the same frequency band as that group are written. If there is no preset-written frequency in all storage areas of the group, the reception electric field is extended over the storage area of the selected group and the storage areas of other groups in the same frequency band. A preset channel selection method characterized in that frequencies having an intensity equal to or higher than a predetermined level are sequentially swept to perform preset writing.