JP2002141781A - Auto-preset receiver - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an auto-preset type receiver that has high preset accuracy and does not require a data table storing the frequency of a broadcast station. SOLUTION: Scanning is sequentially performed from a lowest frequency to a highest frequency of a broadcast band, and a plurality of reception confirmations are performed for each tuning frequency selected by scanning, and whether or not the tuning frequency can be received is determined. And presetting a tuning frequency determined to be receivable, so that a tuning frequency with a stable reception intensity level, that is, a broadcasting station frequency, can be reliably preset, and tuning of only noise with an unstable reception intensity level. Frequency presets can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-preset receiver, and more particularly, to an auto-preset receiver for automatically detecting a receivable broadcasting station frequency and presetting the same.

[0002]

2. Description of the Related Art Conventionally, there is an auto-preset type receiver for automatically detecting a receivable broadcasting station frequency and presetting the same. In a conventional auto-preset operation, it is general to determine whether or not the reception intensity level of a tuning frequency is equal to or higher than a threshold value serving as a preset reference, and preset a tuning frequency equal to or higher than the threshold value.

However, in the above-described method, noise is detected at a frequency other than the broadcasting station frequency, and when the reception intensity level of the noise exceeds a threshold, the frequency at which the noise is detected is preset. However, there is a problem that the preset accuracy is significantly reduced. In particular, since the noise level is high in the frequency band of AM radio broadcasting, the possibility of presetting an unnecessary frequency is extremely high. However, if the preset reference threshold is set high, it is not possible to preset a frequency that is a broadcasting station frequency but has a low reception intensity level, and similarly, there is a problem that the preset accuracy is reduced.

To solve this problem, Japanese Patent Laid-Open No.
A technique described in JP-A-88123 has been proposed.
In this technique, only the broadcasting station frequencies existing in a specific area specified by the area specifying means are scanned, and the broadcasting station frequencies determined to be receivable by the scanning are sequentially preset.

[0005]

SUMMARY OF THE INVENTION Conventional Japanese Patent Application Laid-Open No. 11-8 / 1999
In the method described in Japanese Patent No. 8123, although the preset accuracy is improved, the operation up to auto-preset is complicated because an area specifying means for specifying a specific area is required. In addition, a data table that stores the frequencies of the broadcasting stations that exist in each specific area is required, which not only takes time and effort to create the data table, but also requires a memory for storing the data table, thereby increasing the cost of the receiver itself. Leads to. Furthermore, when a broadcasting station is newly established at a new frequency, there is a problem that the frequency table of the newly established broadcasting station does not exist in the data table, so that auto preset is not performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide an auto-preset receiver which has high preset accuracy and does not require a data table storing the frequencies of broadcast stations.

[0007]

According to the first aspect of the present invention, scanning is sequentially performed from the lowest frequency to the highest frequency of a broadcast band, and a plurality of reception confirmations are performed for each of the selected frequencies selected by the scan. To determine whether or not the tuning frequency is receivable, and to preset the tuning frequency determined to be receivable, to reliably preset a tuning frequency, that is, a broadcasting station frequency having a stable reception intensity level. In addition to this, it is possible to eliminate the preset of the tuning frequency of only the noise whose reception intensity level is not stable.

[0010] According to a second aspect of the present invention, the mobile station sequentially scans from the lowest frequency to the highest frequency of the broadcast band, and performs a plurality of reception confirmations on each of the selected frequencies selected by the scan. Determine whether or not the frequency is receivable, temporarily store the tuning frequency determined to be receivable, execute the scanning operation a plurality of times, of the tuning frequency stored by the plurality of scanning operations Since the tuning frequency stored in all the scanning operations is preset, the presetting of the tuning frequency of only the noise whose reception intensity level is not stable can be more reliably eliminated.

According to a third aspect of the present invention, in the auto-preset receiver according to the second aspect, the reception intensity level of the selected frequency is temporarily stored together with the selected frequency, and the received intensity level is stored by a plurality of scanning operations. Of the selected tuning frequencies, the tuning frequencies stored in all scan operations are preset in the order of higher reception intensity level, so that the selection frequency with the lower reception number can be preset to the higher reception intensity level. Subsequent channel selection operation can be simplified.

According to a fourth aspect of the present invention, a scan is sequentially performed from the lowest frequency to the highest frequency of a broadcast band, a threshold value serving as a preset reference is set, and reception is performed a plurality of times for each selected frequency. Make a check, determine whether the tuning frequency is receivable by comparing the threshold and the reception intensity level of the tuning frequency, temporarily store the tuning frequency determined to be receivable Then, the scan operation is performed a plurality of times, the threshold value is changed for each repeat of the scan operation, and the tuning frequencies stored in all the scan operations are prioritized among the tuning frequencies stored in the plurality of scan operations. Presetting, it is possible to reliably preset a tuning frequency with a stable reception intensity level, and to eliminate a preset of a tuning frequency of only noise with an unstable reception intensity level. In addition, since the tuning frequencies are preset in descending order of the number of times that the reception is determined to be receivable by the reception confirmation, it is possible to preset the tuning frequencies that are broadcast but have a low reception intensity level. Become.

[0011] The invention according to claim 5 provides the invention according to claims 1 to 4.
The auto-preset receiver according to any one of the above,
A plurality of reception confirmations are performed at predetermined time intervals for each tuning frequency to be tuned, and the level fluctuation of the tuning frequency is monitored to determine whether the tuning frequency is receivable. Therefore, it is possible to eliminate the preset of the tuning frequency of only the noise whose reception intensity level is not stable.

[0012]

FIG. 1 is a block diagram showing an embodiment of an auto-preset receiver according to the present invention. In the figure, a key input unit 10 includes an auto preset key for executing an auto preset, a call key such as a numeric keypad for calling a preset broadcast station, and a selection key such as an UP key / DOWN key for manually selecting a station. It is composed of station keys and the like. The display 12 visually displays the state of the receiver, and displays that auto preset is being performed.
The tuning frequency, etc. are displayed. For example, when the call key of the preset broadcast station of the key input unit 10 is pressed, the preset number and frequency of the preset broadcast station are displayed.

The CPU 14 supplies tuning frequency information corresponding to the key input of the key input unit 10 to the tuner 18 and causes the display 12 to perform a display corresponding to the key input. For example, when the auto preset key is pressed, the tuning frequency information is supplied to the tuner 18 according to a program described later, and a receivable signal from the tuner 18 is received. In addition, the display unit 12 is caused to display that auto preset is being performed. After the end of the auto preset, the preset number and tuning frequency of the preset broadcasting station are stored in the memory 16. When the call key of the preset broadcast station is pressed, the CPU 14 reads out the preset number and the tuning frequency of the preset broadcasting station from the memory 16 and supplies them to the tuner 18 as tuning frequency information. Tune the station frequency.

The tuner 18 selects a frequency according to the tuning frequency information supplied from the CPU 14. During the auto-preset operation, when the reception intensity level is larger than the threshold value, it is determined that reception is possible, and a reception enable signal is generated and supplied to the CPU 14.

The memory 16 temporarily stores, for example, the number of reception confirmations, receivable frequencies, and reception intensity levels used during the auto-preset operation. After the end of the auto preset, the preset number and tuning frequency of the preset broadcast station are stored.

FIG. 2 shows a flowchart of the auto preset operation according to the first embodiment of the present invention. In this embodiment, during the auto-preset operation, a change in the reception intensity level is monitored by performing reception confirmation a plurality of times for one tuning frequency, and when it is determined that reception is possible in all reception confirmations, , A preset frequency is selected. In the present embodiment, an example is shown in which reception confirmation is performed three times for one tuning frequency.

In FIG. 2, when the auto-preset key of the key input unit 10 is depressed and the auto-preset operation is started, in step S10, the lowest frequency of the broadcast band (522 kHz for Japanese AM radio broadcast, 522 kHz for FM radio broadcast) (For example, 76 MHz) is set as the tuning frequency. Next, in step S12, 1 is set to a variable N indicating the number of reception confirmations.

Subsequently, in step S14, a tuning frequency is selected to confirm reception, and in step S16, it is determined whether or not reception is possible. If it is determined in step S16 that reception is possible, it is determined in step S18 whether the variable N is 3. If it is determined that the variable N is not 3, it means that the reception confirmation has not been performed three times yet, so that an operation of N = N + 1 is performed in step S20, and a time interval of about 300 msec is performed in step S22, and step S14 is performed. And confirm the reception again. Here, the time interval is set on the assumption that the preset determination for one tuning frequency is completed in approximately one second.

If it is determined in step S18 that the variable N is 3, it means that it has been determined that all reception is possible in three reception confirmations, so that it is determined that the tuning frequency can be tuned. In step S24, this tuning frequency is preset. After presetting the tuning frequency, in step S26, the current tuning frequency is set to the highest frequency in the broadcast band (1629 kHz for FM radio broadcasting in Japan, FM
It is checked whether the frequency exceeds 90 MHz for radio broadcasting. If the frequency exceeds the maximum frequency, the auto preset operation is terminated. If the frequency does not exceed the maximum frequency, the next frequency (Japan AM radio broadcast +
9 kHz, or +0.1 MHz for FM radio broadcasting), and the operation after step S12 is repeated.

At least once during the three acknowledgments, step S
If it is determined in step 16 that reception is impossible, the process proceeds to step S26 without presetting the tuning frequency. If the maximum frequency has been reached in step S26, the auto preset operation ends.

FIG. 3 shows a flowchart of an auto preset operation according to a second embodiment of the present invention. In this embodiment, during the auto-preset operation, a change in the reception intensity level is monitored by performing reception confirmation a plurality of times for one tuning frequency, and when it is determined that reception is possible in all reception confirmations, In order to store the tuning frequency, the scanning operation up to the lowest frequency and the highest frequency of the broadcast band is performed a plurality of times, and when it is determined that the reception is possible in the reception confirmation in all the scanning operations, the stored tuning frequency is determined. Configure to be preset. In the present embodiment, an example is shown in which the reception confirmation is performed three times for one tuning frequency and the scanning operation is performed three times.

In FIG. 3, when the auto-preset key of the key input unit 10 is depressed and the auto-preset operation is started, in step S30, the lowest frequency of the broadcast band (522 kHz for AM radio broadcast in Japan, and 522 kHz for FM radio broadcast) (For example, 76 MHz) is set as the tuning frequency. Next, in step S31, 1 is set to a variable M indicating the number of scan operations, and in step S32, 1 is set to a variable N indicating the number of reception confirmations.

Subsequently, in step S34, a tuning frequency is selected to confirm reception, and in step S36, it is determined whether reception is possible. If it is determined in step S36 that reception is possible, it is determined in step S38 whether the variable N is 3. If it is determined that the variable N is not 3, it means that the reception confirmation has not been performed three times yet, so that the calculation of N = N + 1 is performed in step S40, and a time interval of approximately 300 msec is performed in step S42, and step S34 is performed. And confirm the reception again. Here, the time interval is set on the assumption that the preset determination for one tuning frequency is completed in approximately one second.

If it is determined in step S38 that the variable N is 3, it means that it has been determined that all of the three receptions can be received, and that the tuning frequency can be tuned. In step S44, the selected frequency is temporarily stored in the memory 16. After storing the tuning frequency, in step S46, the current tuning frequency is set to the highest frequency in the broadcasting band (1629 kHz for AM radio broadcasting in Japan).
z, it is checked whether the frequency exceeds 90 MHz for FM radio broadcasting). If the frequency exceeds the maximum frequency, the process proceeds to step S50. If the frequency does not exceed the maximum frequency in step S46, the next step S48 is performed. Frequency (Japanese AM
+9 kHz for radio broadcasting, +0 for FM radio broadcasting.
1 MHz), and the operation after step S32 is repeated.

Step S at least once during three reception confirmations
If it is determined in step 36 that the signal cannot be received, the process proceeds to step S46 without presetting the tuning frequency. If the maximum frequency has been reached in step S46, it is determined in step S50 whether or not the variable M is 3. If it is determined that the variable M is not 3, it means that the scanning operation has not been performed three times yet, so that the operation of the variable M = M + 1 is performed in step S52, and step S3 is performed.
The operation after step 2 is repeated.

If it is determined in step S50 that the variable M is 3, the tuning frequency temporarily stored in the memory 16 is checked, and in step S54 the tuning frequency is stored in all three scanning operations. Only the selected frequency is finally set as a tunable frequency that can be tuned, and preset in ascending frequency order, and the process ends.

FIG. 4 is a flowchart of an auto-preset operation according to a third embodiment of the present invention. In this embodiment, during the auto-preset operation, a change in the reception intensity level is monitored by performing reception confirmation a plurality of times for one tuning frequency, and when it is determined that reception is possible in all reception confirmations, In order to store the tuning frequency, perform the scanning operation up to the lowest frequency and the highest frequency of the broadcast band a plurality of times, and when it is determined that the reception is possible by the reception confirmation in all the scanning operations, the reception intensity level is in descending order It is configured to preset the stored tuning frequency.
In the present embodiment, an example is shown in which the reception confirmation is performed three times for one tuning frequency and the scanning operation is performed three times.

In FIG. 4, when the auto-preset key of the key input unit 10 is pressed and the auto-preset operation is started, in step S130, the lowest frequency of the broadcast band (522 kHz for AM radio broadcast in Japan and 522 kHz for FM radio broadcast) (For example, 76 MHz) is set as the tuning frequency. next,
In step S131, 1 is set to a variable M indicating the number of scan operations, and in step S132, 1 is set to a variable N indicating the number of reception confirmations.

Subsequently, in step S134, a tuning frequency is selected to confirm reception, and in step S136, it is determined whether reception is possible. If it is determined in step S136 that reception is possible, then in step S138 the variable N
Is 3 or not. If it is determined that the variable N is not 3, it means that the reception confirmation has not been performed three times yet, so that N = N + 1 is calculated in step S140, and a time interval of about 300 msec is set in step S142, and step S134 is performed. And confirm the reception again. Here, the time interval is set on the assumption that the preset determination for one tuning frequency is completed in approximately one second.

If it is determined in step S138 that the variable N is 3, it means that it has been determined that all reception is possible in three reception confirmations, so it is determined that the tuning frequency can be tuned. In step S144, this tuning frequency is temporarily stored in the memory 16, and in step S145
, The reception intensity level of the selected frequency is temporarily stored in the memory 16. Thereafter, in step S146, the currently selected frequency is the highest frequency in the broadcasting band (1629 kHz for Japanese AM radio broadcasting, 90 MHz for FM radio broadcasting).
It is checked whether the frequency exceeds the maximum frequency. If the frequency exceeds the maximum frequency, the process proceeds to step S150. If the frequency does not exceed the maximum frequency in step S146, the next frequency (+9 kHz for AM radio broadcasting in Japan) is used in step S148. , FM
(In the case of radio broadcasting, +0.1 MHz) is selected, and the operation after step S132 is repeated.

Step S at least once during three reception confirmations
If it is determined in 136 that the signal cannot be received, the process proceeds to step S146 without presetting the tuning frequency. If the maximum frequency has been reached in step S146, it is determined in step S150 whether or not the variable M is 3. If it is determined that the variable M is not 3, it means that the scanning operation has not been performed three times yet.
In step S152, the operation of the variable M = M + 1 is performed, and the operation after step S132 is repeated.

If it is determined in step S150 that the variable M is 3, the tuning frequency temporarily stored in the memory 16 is confirmed, and in step S154, the tuning frequency is stored in all three scanning operations. Only the tuning frequency is finally set as a tuning frequency that can be tuned, and the processing is terminated after presetting in the descending order of the reception intensity level.

FIG. 5 is a flowchart showing an auto-preset operation according to a fourth embodiment of the present invention. In this embodiment, during the auto-preset operation, a change in the reception intensity level is monitored by performing reception confirmation a plurality of times for one tuning frequency, and when it is determined that reception is possible in all reception confirmations, To store the tuning frequency, perform the scanning operation up to the lowest frequency and the highest frequency of the broadcast band multiple times while changing the threshold, and confirm the tuning frequency stored in the reception confirmation in all the scanning operations , The preset frequency is preset in descending order of tuning frequency. In the present embodiment, an example is shown in which the reception confirmation is performed three times for one tuning frequency and the scanning operation is performed three times.

In FIG. 5, when the auto-preset key of the key input section 10 is pressed and the auto-preset operation is started, in step S228, the lowest frequency of the broadcast band (522 kHz for Japanese AM radio broadcast, 522 kHz for FM radio broadcast) (For example, 76 MHz) is set as the tuning frequency. next,
In step S230, a threshold value serving as a preset reference is set. In step S231, a variable M indicating the number of scan operations is set to 1, and in step S232, a variable N indicating the number of reception confirmations is set to 1.

Subsequently, in step S234, a tuning frequency is selected to confirm reception, and in step S236, it is determined whether reception is possible. If it is determined in step S236 that the reception is possible, then in step S238 the variable N
Is 3 or not. If it is determined that the variable N is not 3, it means that the reception confirmation has not been performed three times yet, so that the calculation of N = N + 1 is performed in step S240, and a time interval of about 300 msec is performed in step S242, and step S234 is performed. And confirm the reception again. Here, the time interval is set on the assumption that the preset determination for one tuning frequency is completed in approximately one second.

If it is determined in step S238 that the variable N is 3, it means that it has been determined that all reception is possible in three reception confirmations, so that it is determined that the tuning frequency can be tuned. In step S244, this tuning frequency is temporarily stored in the memory 16. Thereafter, in step S246, it is checked whether or not the currently selected frequency is higher than the highest frequency of the broadcast band (1629 kHz for Japanese AM radio broadcast, 90 MHz for FM radio broadcast), and exceeds the highest frequency. If so, step S250
If the frequency does not exceed the highest frequency in step S246, the next frequency is determined in step S248 (+9 kHz for Japanese AM radio broadcasting, +0.1 M for FM radio broadcasting).
Hz), and the operation after step S232 is repeated.

Step S at least once during three reception confirmations
If it is determined in 236 that the reception is impossible, the process proceeds to step S246 without presetting the tuning frequency. If the maximum frequency has been reached in step S246, it is determined in step S250 whether the variable M is 3. If it is determined that the variable M is not 3, it means that the scanning operation has not been performed three times yet.
In step S252, the calculation of the variable M = M + 1 is performed, and in step S254, the threshold level is changed and step S232 is performed.
The subsequent operation is repeated.

If it is determined in step S250 that the variable M is 3, the tuning frequency temporarily stored in the memory 16 is checked in step S256, and the process is performed by presetting the tuning frequency in descending order of the stored number. finish.

Here, the threshold value to be set may be set relatively low during the first scanning operation, and may be set gradually higher from the second scanning operation. It is also possible to select a certain selected frequency by setting the target frequency to be relatively high, and then slightly lower the threshold level at the time of the third scanning operation to select a selected frequency having a low reception intensity level.

When three scan operations are set to be performed as in the present embodiment, presetting is performed in order from the tuning frequency stored in all three scan operations, and the preset channel becomes empty. If there is, the tuning frequencies stored in two out of three scan operations are sequentially preset.

By performing the auto-preset using each of the above embodiments, it is possible to eliminate the preset of the tuning frequency of only the noise whose reception intensity level is not stable. At a tuning frequency including only noise, the fluctuation of the reception intensity level (noise level) is large, so that the PLL of the tuner 18 is not locked, and there is no continuous tuning in time.
Therefore, by performing reception confirmation a plurality of times at time intervals, it is possible to monitor fluctuations in the reception intensity level, and it is possible to select a frequency selected only for noise and eliminate a preset.

Further, as in the second to fourth embodiments, the preset method is improved and devised based on the auto preset method of the first embodiment, so that the tuning frequency being broadcast can be more reliably determined. It is possible to perform the presetting, and it is possible to more reliably eliminate the presetting of the tuning frequency including only the noise.

Also, by steadily presetting the tuning frequencies that can be reliably received to the smaller preset numbers, it is possible to simplify the operation of calling a preset broadcast station after auto-preset, and to enable reception. It is possible to call a preset station in a short time.

Steps S28, S48, S14
Steps S16, S36, S136, and S236 correspond to determining means, and steps S24, S54, S154, and S25 correspond to the scanning means described in claims.
6 corresponds to the preset means, and steps S44 and S14
4, S145, S244 correspond to the storage means, and steps S50, S52, S150, S152, S250, S2
52 corresponds to the repeat means, step S230 corresponds to the threshold value setting means, and step S254 corresponds to the threshold value change means.

[0045]

As described above, the first aspect of the present invention provides
Scan sequentially from the lowest frequency to the highest frequency of the broadcast band, perform reception confirmation a plurality of times for each tuning frequency selected by scanning, and determine whether the tuning frequency is receivable. In order to preset a tuning frequency determined to be receivable, it is possible to reliably preset a tuning frequency having a stable reception intensity level, that is, a broadcasting station frequency, and to preset a tuning frequency only for noise having an unstable reception intensity level. Can be eliminated.

According to a second aspect of the present invention, the broadcast station sequentially scans from the lowest frequency to the highest frequency of the broadcast band, and performs a plurality of reception confirmations on each of the selected frequencies selected by the scan. Determine whether or not the frequency is receivable, temporarily store the tuning frequency determined to be receivable, execute the scanning operation a plurality of times, of the tuning frequency stored by the plurality of scanning operations Since the tuning frequency stored in all the scanning operations is preset, the presetting of the tuning frequency of only the noise whose reception intensity level is not stable can be more reliably eliminated.

According to a third aspect of the present invention, the receiving frequency level of the selected frequency is temporarily stored together with the selected frequency,
Of the tuning frequencies stored by the multiple scanning operations, the tuning frequencies stored in all the scanning operations are preset in the order of higher reception intensity level, so that the tuning number with the lower preset number has the higher reception intensity level. The frequency can be preset, and the tuning operation after auto-preset can be simplified.

According to a fourth aspect of the present invention, the scanning is sequentially performed from the lowest frequency to the highest frequency of the broadcast band, a threshold value serving as a preset reference is set, and reception is performed a plurality of times for each selected frequency. Make a check, determine whether the tuning frequency is receivable by comparing the threshold and the reception intensity level of the tuning frequency, temporarily store the tuning frequency determined to be receivable Then, the scan operation is performed a plurality of times, the threshold value is changed for each repeat of the scan operation, and the tuning frequencies stored in all the scan operations are prioritized among the tuning frequencies stored in the plurality of scan operations. Presetting, it is possible to reliably preset a tuning frequency with a stable reception intensity level, and to eliminate a preset of a tuning frequency of only noise with an unstable reception intensity level. In addition, since the tuning frequencies are preset in descending order of the number of times that the reception is determined to be receivable by the reception confirmation, it is possible to preset the tuning frequencies that are broadcast but have a low reception intensity level. Become.

According to a fifth aspect of the present invention, reception confirmation is performed a plurality of times at predetermined time intervals with respect to each tuning frequency to be tuned, and a level fluctuation of the tuning frequency is monitored. Since it is determined whether or not the tuning frequency is receivable, it is possible to eliminate the presetting of the tuning frequency only for the noise whose reception intensity level is not stable.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of an auto-preset receiver according to the present invention.

FIG. 2 is a flowchart of an auto preset operation according to the first embodiment of the present invention.

FIG. 3 is a flowchart of an auto preset operation according to a second embodiment of the present invention.

FIG. 4 is a flowchart of an auto preset operation according to a third embodiment of the present invention.

FIG. 5 is a flowchart of an auto preset operation according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Key input unit 12 Display 14 CPU 16 Memory 18 Tuner

Claims (5)

[Claims] A scanning unit for sequentially scanning from a lowest frequency to a highest frequency of a broadcast band; and a plurality of reception confirmations for each tuning frequency selected by the scanning unit, wherein the tuning frequency is determined. An auto-preset receiver comprising: a determination unit that determines whether reception is possible; and a preset unit that presets a tuning frequency determined to be receivable by the determination unit. 2. A scanning means for sequentially scanning from the lowest frequency to the highest frequency of a broadcast band; and a plurality of reception confirmations are performed for each tuning frequency selected by the scanning means, and the tuning frequency is determined. Determination means for determining whether or not reception is possible; storage means for temporarily storing a tuning frequency determined to be receivable by the determination means; and repeat means for executing a scanning operation by the scanning means a plurality of times. And a preset means for presetting a tuning frequency stored in the storage means in all scanning operations among tuning frequencies stored by a plurality of scanning operations by the repeat means. Preset type receiver. 3. The auto-preset receiver according to claim 2, wherein the storage unit temporarily stores a reception intensity level of the tuning frequency together with the tuning frequency, and the preset unit performs a plurality of scans. An auto-preset type receiver, wherein, among the tuning frequencies stored by the operation, the tuning frequencies stored in the storage means are preset in descending order of the reception intensity level in all the scanning operations. 4. A scanning means for sequentially scanning from a lowest frequency to a highest frequency of a broadcast band; a threshold setting means for setting a threshold serving as a preset reference; and for each tuning frequency selected by the scanning means. A plurality of reception confirmations are performed, a determination unit that determines whether the tuning frequency is receivable by comparing the threshold and a reception intensity level of the tuning frequency, and that the determination unit is capable of receiving. Storage means for temporarily storing the determined tuning frequency; repeat means for executing the scan operation by the scan means a plurality of times; and threshold change means for changing the threshold value for each repeat of the scan operation by the repeat means. Of the tuning frequencies stored by a plurality of scanning operations performed by the repeat unit, all the scanning operations are stored in the storage unit. And a presetting means for preferentially presetting the stored tuning frequency. 5. The auto-preset receiver according to claim 1, wherein the determination unit is configured to perform a plurality of selections at predetermined time intervals with respect to each tuning frequency selected by the scanning unit. An auto-preset type receiver, comprising: performing a number of reception checks; monitoring a level change of the tuning frequency; and determining whether the tuning frequency is receivable.