JP2001136052A - On-vehicle receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle receiver that stores frequencies corresponding to a channel selection switch so as to receive a broadcast wave at a frequency selected among the stored frequencies. SOLUTION: A microcomputer 12 reads a frequency stored in a frequency storage area 1 in a memory 13 corresponding to a channel selection switch 4 and sets a receiving frequency to a reception section 11. The reception section 11 receives a broadcast wave with a set frequency from an antenna 15, demodulates the received broadcast wave into a video signal and an audio signal and provides an output, and detects reception sensitivity of the broadcast wave and provides an output to the microcomputer 12. When the frequency switching by automatic selection is allowed for the microcomputer 12, the microcomputer 12 reads a frequency stored in a frequency storage area 2 in the memory 13 in the case that the reception sensitivity of the broadcast wave being received is lower than a prescribed value and sets a received frequency to the reception section 11. The microcomputer 12 reads a frequency stored in a frequency storage area 3 and then 4 in the case that the reception sensitivity of the broadcast wave being received is furthermore lower than the prescribed value and sets the read frequency to the reception section 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle receiver for receiving television and radio broadcasts.

[0002]

2. Description of the Related Art An in-vehicle receiver for receiving a broadcast wave transmitted from a broadcasting station has a function of selecting one of the broadcasting stations to be received so that the driver can also perform a tuning operation. A tuning operation is performed by a simple operation such as a button operation.
In such a receiver, the frequency of a broadcast wave transmitted from a broadcasting station is stored in advance in a memory or the like provided in the receiver, and the stored frequency is operated by operating a predetermined channel selection switch. Is read from the memory and set as the reception frequency of the receiver, and a broadcast wave of this frequency is received.

[0003] In the above-described in-vehicle receiver, the frequency of a broadcast wave transmitted from a desired broadcast station is stored in a memory in the receiver, and the operation panel of the receiver is read in order to read out the frequency stored in the memory. For example, four tuning push-button switches are provided. One frequency is stored in the memory in the receiver corresponding to each of the switches, so that a maximum of four broadcast wave frequencies are stored. Therefore, by pressing any one of the four channel selection push-button switches, the frequency stored in the memory in the receiver corresponding to this switch is read out and set as the reception frequency of the receiver. You. 4
If the frequencies of the broadcast waves transmitted from different broadcast stations are stored in the memory corresponding to the respective push button switches, any one of the four broadcast stations can be selected by one-button operation.

[0004]

However, in the case of an in-vehicle receiver, the receiving condition of the broadcast wave being received changes as the vehicle travels. For example, when traveling on a mountainous terrain road, the broadcast wave being received cannot be clearly received because the main broadcast wave transmitted from the transmission antenna of the broadcast station is blocked by the mountain. In these areas,
A relay antenna is appropriately arranged according to the reception state of the broadcast wave, and is relayed and transmitted at a transmission frequency different from that of the main broadcast wave. For this reason, when the reception condition due to the main broadcast wave during reception deteriorates, the driver has to search for a broadcast wave of a different frequency relayed by the relay antenna and reselect the station. In particular, the reach of broadcast waves is relatively short,
This is likely to be a problem when receiving FM broadcasts and television broadcasts, which have strong broadcast wave straightness.

An object of the present invention is to provide an on-vehicle receiver which stores a plurality of frequencies corresponding to one tuning switch and receives at a frequency selected from the stored plurality of frequencies. It is in.

[0006]

The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment. (1) The invention of claim 1 is a receiving means 11 for receiving a broadcast of a set frequency, a storing means 13 for storing an arbitrary receiving frequency, and a receiving means 11 for reading out the stored receiving frequency.
This is applied to an in-vehicle receiver provided with a frequency setting means 12 for setting the frequency. The storage means 13 has a storage area for storing reception frequencies corresponding to one tuning switch, and the storage area stores a plurality of reception frequencies, thereby achieving the above object. (2) According to a second aspect of the present invention, in the receiver according to the first aspect, one receiving frequency is automatically selected from a plurality of receiving frequencies stored in the storage area and set to the receiving means 11. It is characterized by comprising a control means 12 for controlling the frequency setting means 12. (3) The invention according to claim 3 is the receiver according to claim 2, wherein the signal strength detection means 112 for detecting the signal strength received by the reception means 11 and the reception frequency set by the frequency setting means 12 While receiving the radio wave of
When the signal strength detected at the time becomes lower than the predetermined value, another receiving frequency stored in the storage area is set in the receiving means 11, and a frequency having a higher signal strength is automatically selected from among them. A control unit for controlling the frequency setting unit. (4) In the receiver according to the third aspect, when all of the signal strengths of the radio waves respectively received at the plurality of reception frequencies stored in the storage area are lower than a predetermined value, the control means may be used. 12 stops automatic selection operation. (5) According to a fifth aspect of the present invention, in the receiver according to the fourth aspect, when the control means 12 stops the operation of the automatic selection, the control unit 12 selects the reception frequency selected before performing the operation of the automatic selection. After that, the operation of the automatic selection is stopped. (6) The receiver according to claim 6, further comprising a time measuring means 12 for measuring the time after the operation of the automatic selection is stopped, wherein the control means 12 controls the time measured by the time measuring means 12. Is automatically restarted when the value becomes equal to or more than a predetermined value. (7) The invention according to claim 7 is characterized in that, in the receiver according to claim 3, there is provided a prohibition unit 12 for prohibiting an automatic selection operation by setting of an operator. (8) According to the invention of claim 8, in the receiver according to claim 3, when only one reception frequency is stored in the storage area, the control means 12 inhibits the operation of automatic selection. I do. (9) The invention of claim 9 is a receiving means 11 for receiving a broadcast of a set frequency, a storage means 13 for storing an arbitrary receiving frequency, and a receiving means 11 for reading out the stored receiving frequency.
This is applied to an in-vehicle receiver provided with a frequency setting means 12 for setting the frequency. The storage area has a storage area for storing reception frequencies corresponding to one tuning switch, and a first storage means 13 for storing a plurality of reception frequencies in this storage area; Second storage means 13 for storing the last read reception frequency from the plurality of reception frequencies
Selecting means 14 for selecting a storage area; and when the storage area is selected by the selecting means 14, the reception frequency read last in the selected storage area is read from the second storage means 13 and The above-described object is achieved by providing the control unit 12 that controls the frequency setting unit 12 so that the frequency is set to.

In the section of the means for solving the above-mentioned problems, the description is made in correspondence with the drawings of the embodiment for easy understanding of the description, but the present invention is not limited to the embodiment. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS -First Embodiment- An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a system configuration of an on-vehicle television tuner according to the first embodiment of the present invention. The in-vehicle television tuner 10 shown in FIG. 1 receives a broadcast wave, demodulates the broadcast wave into a video signal and an audio signal, and detects a reception signal level of the received broadcast wave.
A microcomputer 12 to which a reception frequency of a broadcast wave is set and a reception signal level detected by the reception unit 11 is input, and a memory 13 which stores the frequency of the broadcast wave and reads out the stored frequency. An operation member 14 for performing an input operation of inputting a reception frequency to the on-vehicle TV tuner 10 and a selection operation of selecting an arbitrary frequency from the input reception frequencies;
1 is connected to the antenna 15.

[0009] The receiving unit 11 receives a broadcast wave of a frequency set by the microcomputer 12 from the antenna 15. The received broadcast wave is demodulated and separated into a video signal and an audio signal to output a video signal to an external display device and output an audio signal to an external playback device. When the received broadcast is a stereo broadcast, the audio signal is separated into an R signal and an L signal. The receiving unit 11 detects the reception sensitivity of the received broadcast wave, that is, a reception signal level proportional to the electric field strength of the broadcast wave, and outputs the detected reception sensitivity to the microcomputer 12.

FIG. 2 is a block diagram showing the configuration of the receiving section 11. The antenna 15 receives the broadcast wave and sends a high-frequency current to the front end unit 111. The front end 111
A high-frequency current having a frequency set by the microcomputer 12 is selected and amplified from the high-frequency current input from the antenna 15, and the amplified high-frequency signal is converted into an intermediate frequency signal and output to the intermediate frequency amplifier 112. In the intermediate frequency signal, the video signal is converted to the intermediate frequency = 22.25 (MHz), and the audio signal is converted to the intermediate frequency = 26.75 (MHz). Intermediate frequency amplifying section 112 amplifies the input intermediate frequency signal including the video signal and the audio signal, and outputs the amplified intermediate frequency signal to video detecting section 113 and audio intermediate frequency amplifying section 115. Further, the signal level of the amplified intermediate frequency signal is detected, and the detected signal level is output to the microcomputer 12 as the reception sensitivity.

The video detector 113 detects the intermediate frequency signal having undergone the intermediate frequency amplification by diode detection, extracts an amplitude-modulated video signal from the intermediate frequency signal, and obtains a video amplifier 114.
Output to The video amplifying unit 114 amplifies the input video signal, further cuts off the intermediate frequency component of the audio signal, and
The video signal is output to a display device such as a CD display.

The audio intermediate frequency amplifying section 115 mixes the audio signal and the video signal included in the intermediate frequency signal which has been subjected to the intermediate frequency amplification, and sets a beat frequency of the intermediate frequency of both signals.
Convert to 5 (MHz) audio intermediate frequency signal. This audio intermediate frequency signal is amplified and output to audio detection section 116. The audio detection unit 116 performs FM detection on the audio intermediate frequency signal, extracts a frequency-modulated audio signal, and performs multiplexing (MPX) /
Output to amplifying section 117. Multiplex (MPX) / Amplifier 11
Numeral 7 separates an audio signal into an R channel and an L channel and amplifies them in the case of stereo broadcast, and outputs the amplified audio signal (R) and audio signal (L) to a reproducing device such as a speaker.

The operating member 14 shown in FIG.
, And a frequency input switch. When the frequency is stored in the memory 13, an operation signal by the frequency input switch and the tuning switch is output to the microcomputer 12, and when the frequency is read from the memory 13, an operation signal of the tuning switch is output to the microcomputer 12. I do.

The memory 13 is operated by an operation member 14.
There are independent storage areas corresponding to ~ 4 tuning switches, and up to four frequencies for each storage area, and which of the four frequencies stored in this storage area are read last. And information indicating whether or not they are stored. These frequencies and information are stored via the microcomputer 12 and read out via the microcomputer 12.

When storing the frequency in the memory 13, the microcomputer 12 detects a tuning switch operated by an operation signal input from the operating member 14, and stores a frequency input switch in a storage area corresponding to the tuning switch. To store the input frequency. Further, when reading the frequency from the memory 13, a tuning switch operated by an operation signal input from the operating member 14 is detected, and from among the frequencies stored in the storage area corresponding to the tuning switch, the following description will be given. One frequency is read out, and information indicating the read out frequency is stored in a storage area. The information indicating the read frequency is overwritten and stored in the same area of the memory 13 every time the frequency data is newly read. When reading the frequency from the memory 13, the microcomputer 12 sets the frequency as the reception frequency of the receiving unit 11.

A reading process for reading one frequency from the frequencies stored in the storage area corresponding to the tuning switch in the memory 13 as described above will be described. FIG. 3 is a table showing an example of correspondence between storage areas provided in the memory 13 corresponding to the tuning switches 1 to 4 and frequencies stored in these storage areas. As described above, since a maximum of four frequencies are stored in each storage area, the stored frequencies are represented by frequency 1 to frequency 4. In FIG. 3, the symbol “x” indicates that the frequency is not stored in that area. For example, if the storage area corresponding to the tuning switch 3 is taken as an example, the frequency corresponding to 54 ch is 1
Indicates that only one is memorized. The frequencies stored in the respective storage areas are stored as frequency 1 and frequency 2 in the order of storage, and the fourth stored frequency is stored as frequency 4.

A flowchart of a receiving operation performed when any one of the tuning switches 1 to 4 is operated, when the tuning switch 4 is operated.
This will be described with reference to FIG. When the tuning switch 4 is operated, the information of the frequency received when the tuning switch 4 was previously operated is read from the memory 13 in step S1 of FIG. This information indicates where the frequency received when the tuning switch was operated last time is stored in the storage area in the memory 13, and is stored in the storage area in the memory 13 in step S10 described later. Is done. Based on this information, the frequency is read from the storage area in the memory 13 and the read frequency is
Is set to In the table of FIG. 3, if the frequency stored in the frequency 1 in the storage area was received when the frequency switch 4 was operated last time, a broadcast wave having a frequency corresponding to 36 ch is received. In step S2,
It is determined whether or not the tuning switch 4 has been operated again. When the determination is affirmative (Y in step S2), the process proceeds to step S3, and when the determination is negative (N in step S2), step S1 is performed.
Go to 0.

In step S 3, the frequency corresponding to 56 ch stored in the frequency 2 of the storage area corresponding to the tuning switch 4 in the memory 13 is read out, and this frequency is set in the receiving unit 11. In step S4, it is determined whether or not the tuning switch 4 has been operated again. If an affirmative determination is made (Y in step S4), the process proceeds to step S5.
If a negative determination is made (N in step S4), the process proceeds to step S10. In step S5, the 6ch stored in the frequency 3 of the storage area corresponding to the tuning switch 4 in the memory 13
Is read out, and this frequency is
Is set to

In step S6, it is determined whether or not the tuning switch 4 has been operated again.
(Y in step S6) the process proceeds to step S7, and if a negative determination is made (N in step S6), the process proceeds to step S10. In step S7, the frequency corresponding to 16ch stored in the frequency 4 of the storage area corresponding to the tuning switch 4 in the memory 13 is read out, and this frequency is set in the receiving unit 11. In step S8, it is determined whether or not the tuning switch 4 has been operated again. When the determination is affirmative (Y in step S8), the process proceeds to step S9, and when the determination is negative (N in step S8), the process proceeds to step S10. . In step S9, a frequency corresponding to 36ch stored in frequency 1 is read out again from the storage area corresponding to the tuning switch 4 in the memory 13, and this frequency is set in the receiving unit 11, and step S2 is performed. Return to

In step S 10, information indicating where the frequency set in the receiving unit 11 and being received is stored in the storage area in the memory 13 is stored in the storage area corresponding to the tuning switch 4. . For example, when a frequency corresponding to 56 ch is being received, this frequency is stored in the memory 13.
The information indicating the frequency 2 is stored in the storage area corresponding to the tuning switch 4 in the frequency 2.
When this information is stored in the storage area in the memory 13, the processing in FIG. 4 ends. According to the operation described above, every time the tuning switch 4 is operated, the frequency stored in the storage area corresponding to the tuning switch 4 in the memory 13 is cyclically read, and the read frequency is Receiver 1
1 is set, and a broadcast wave of this frequency is received.

In the above description, the case where the tuning switch 4 has been operated has been described. However, the same applies when any of the other tuning switches 1 to 3 has been operated. However,
If four frequencies are not stored in the storage area provided in the memory 13 corresponding to the operated tuning switch, the steps in FIG. 4 are skipped according to the number of stored frequencies. Taking the case where the tuning switch 2 is operated as an example, three frequencies 1 to 3 are stored in the storage area corresponding to the tuning switch 2 as shown in the table of FIG. Steps S6 and S7, which are processes related to frequency 4 of No. 4, are skipped. That is, the frequency corresponding to 3 ch stored in the frequency 3 is read in step S5, and when the read frequency is set in the receiving unit 11, the process proceeds to step S8.

The features of the first embodiment will be summarized. (1) A storage area is provided in the memory 13 corresponding to each tuning switch, and each storage area stores up to four frequencies (frequency 1, frequency 2, frequency 3, and frequency 4). These four frequencies are cyclically read out in the order of frequency 1, frequency 2, frequency 3, frequency 4, frequency 1,... By repeatedly operating the same tuning switch. When broadcasting at different frequencies, if each frequency is stored in the storage area corresponding to any one of the tuning switches in the memory 13, only one manipulation of the tuning switch will result in the selection of the four frequencies. It becomes possible to select and receive the frequency that can be most clearly received. (2) When the same tuning switch is not operated again (FIG. 4
(No at Steps S2, S4, S6 and S8), the information on the frequency being received is stored in the storage area of the memory 13 (Step S10), so that the tuning switch is newly operated. When the process of FIG. 4 is started, the information of the frequency stored in the memory 13 is read out, and the same frequency as the previously received frequency is selected from the frequencies 1 to 4 and set in the receiving unit 11. , The broadcast wave of this frequency can be received (step S1).

Second Embodiment In the first embodiment, when an operator repeatedly operates the same channel selection switch, the data is stored in a storage area in the memory 13 corresponding to the operated channel selection switch. In the second embodiment, the microcomputer 12 selects one of the frequencies stored in the storage area of the memory 13 according to the reception sensitivity detected by the reception unit 11. Automatically selects the channel from. The automatic tuning operation according to the present embodiment is performed when the operator operates the operating member 14 in advance to permit the automatic tuning operation.

FIG. 5 is a flowchart of the receiving operation performed when the automatic tuning operation is permitted. When the tuning switch 4 is operated, in step S51 of FIG.
The information of the frequency received when the tuning switch 4 was operated last time is read from the memory 13, and the frequency read from the storage area in the memory 13 is set in the receiving unit 11 based on this information. If the frequency stored in the frequency 1 of the storage area corresponding to the tuning switch 4 in the memory 13 has been received when the frequency switch 4 was operated last time, a broadcast wave having a frequency corresponding to 36 ch is received. You.

In step S52, it is determined whether or not a plurality of frequencies are stored in the storage area in the memory 13. If an affirmative determination is made (Y in step S52), step S52 is executed.
Proceeding to 53, if a negative determination is made (N in step S52), the processing of FIG. 5 ends. In step S53, it is determined whether or not the automatic channel selection operation is permitted. If the determination is affirmative (Y in step S53), the process proceeds to step S54, and if the determination is negative (N in step S53), the process of FIG. To end. In step S54, it is determined whether or not a timer set in step S60 described below has timed out. If the time is up, affirmative judgment
(Y of step S54) The process proceeds to step S55, and a negative determination is made (N in step S54) before the time is up and when the timer is not set (N in step S54).
Return to 2.

In step S55, it is determined whether the switching of the reception frequency by automatic channel selection has been performed a predetermined number of times, for example, five times, and if an affirmative determination is made (step S55).
(Y) The process proceeds to step S59, and if a negative determination is made (N in step S55), the process proceeds to step S56. Step S59
Then, while resetting the counter C for counting the number of frequency switching by automatic channel selection, the frequency received in step S51 before the frequency switching by automatic channel selection is read from the memory 13,
It is set in the receiving unit 11. In step S60, a timer for determining the time-up in step S54 is set. This timer is used to determine a waiting time until the reception frequency is switched by automatic channel selection for a predetermined number of times and then again to start the reception frequency switching by automatic channel selection. Is set. When the timer is set, the process returns to step S52.

In step S56, it is determined whether or not the receiving sensitivity at the receiving frequency detected by the receiving unit 11 is lower than a predetermined value.
56) It is considered that the receiving sensitivity has decreased, and step S5 is performed.
The process proceeds to 7, and if a negative determination is made (N in step S56), the process returns to step S52. In step S57, the counter C for counting the frequency switching by automatic channel selection is advanced by one, and in step S58, the receiving frequency is switched.
Switching of the reception frequency is performed, for example, by setting the frequency (3) stored in the frequency 1 in the storage area corresponding to the tuning switch 4.
If the signal is received in 6ch), the frequency (56ch) stored in frequency 2 is read out and set in the receiving unit 11.
That is, from among the frequencies stored in the storage area corresponding to the tuning switch, frequency 1 (36 ch) → frequency 2
The receiving frequency is switched in the order of (56 ch) → frequency 3 (6 ch) → frequency 4 (16 ch) → frequency 1 (36 ch). When the reception frequency is switched, the process returns to step S52.

Returning to step S52, the above processing is repeated. That is, while the automatic channel selection operation is permitted, an affirmative determination is made in step S53, and the processing subsequent to step S54 is repeatedly performed. If the automatic tuning operation is prohibited, a negative determination is made in step S53, and the process in FIG. 5 ends.

In the above description, the case where the tuning switch 4 is operated has been described.
The same operation is performed when any one of the operations 3 is operated.
However, when four frequencies are not stored in the storage area corresponding to the operated tuning switch, the order of switching the reception frequency in step S58 in FIG. 5 changes according to the number of stored frequencies. Taking the case where the tuning switch 1 is operated as an example, the frequency 1 (42c) is stored in the storage area corresponding to the tuning switch 1 as shown in the table of FIG.
h) and two frequencies of frequency 2 (52 ch) are stored, so frequency 1 (42 ch) → frequency 2 (52 ch) → frequency 1
The receiving frequencies are switched in the order of (42 ch). When only one frequency is stored in the storage area corresponding to the tuning switch 3 in FIG. 3, a negative determination is made in step S52, and the automatic switching process is not performed.

The features of the second embodiment will be summarized. (1) The receiving sensitivity at the frequency received by the receiving unit 11 is detected, and when the receiving sensitivity is lower than a predetermined value, up to four frequencies (frequency 1, frequency 2, frequency 4) stored in the storage area in the memory 13 3, frequency 4), one frequency is read out in the order of frequency 1 → frequency 2 → frequency 3 → frequency 4 → frequency 1..., And this frequency is set in the receiving unit 11 to receive. Therefore, when the same broadcast content is broadcast at four different frequencies (36 ch, 56 ch, 6 ch, 16 ch), if these frequencies are stored in the storage area in the memory 13 corresponding to the tuning switch 4, the vehicle When the reception state changes due to the movement of the, the reception sensitivity can be automatically switched from the four frequencies to a frequency higher than a predetermined value, and the reception can be performed. (2) At the time of the above (1), the number of frequency switching by automatic channel selection is counted, and when the counted number reaches a predetermined number of five (Y in step S55), the frequency received before performing the automatic switching is determined. Set in the receiving unit 11 (step S5
9) Waiting for 5 minutes (step S60)
Even when the reception state changes successively while the vehicle is traveling in the mountainous area, the reception frequency is frequently switched and the reception content is prevented from being interrupted. Further, the frequency switching by the automatic channel selection is resumed after the standby (Y in step S54), so that the frequency switching by the automatic channel selection is periodically performed every standby time.

(3) Since the above (1) is performed when the frequency switching operation by automatic channel selection is permitted, if it is desired to receive at a desired frequency regardless of the receiving sensitivity, the automatic channel selection is used. The frequency switching operation can be prohibited. (4) When only one frequency is stored in the storage area in the memory 13 corresponding to the tuning switch, the frequency switching operation is prohibited (N in step S52). Useless operation is prevented from being performed.

In the above description, if the reception sensitivity of the frequency being received falls below a predetermined value in step S56, the reception frequency is set to the next frequency stored in the storage area corresponding to the tuning switch in step S58. Although switching is performed, a frequency having the highest reception sensitivity may be selected from other frequencies stored in the storage area corresponding to the tuning switch, and may be set as a new reception frequency.

In the above description, the in-vehicle television tuner has been described. However, the present invention may be applied to a radio tuner that cannot receive video. Further, the present invention is characterized by storing a plurality of frequencies corresponding to one tuning switch, and is not limited to the above embodiment. For example, the number of storage areas, the number of frequencies stored in the storage areas, and the like are appropriately set, and various other channel selection procedures are possible.

The correspondence between each component in the claims and each component in the embodiment of the invention will be described. The receiving section 11 is a receiving section, the memory 13 is a storage section, and the first and second storage sections. The microcomputer 12 corresponds to the frequency setting means, the control means, the timekeeping means and the inhibiting means, the intermediate frequency amplifying section 112 corresponds to the signal strength detecting means, and the operating member 14 corresponds to the selecting means.

[0035]

As described in detail above, in the present invention,
The following effects are obtained. (1) According to the first and ninth aspects of the present invention, a plurality of reception frequencies are stored in the storage area provided in the storage means corresponding to one tuning switch. In the case where the same broadcast content is broadcast at a plurality of different frequencies using a plurality of relay antennas,
If these frequencies are stored in the same storage area,
The reception frequency can be stored for each broadcast content, and the operability at the time of tuning is improved. In particular, according to the ninth aspect of the present invention, the reception frequency read last from a plurality of reception frequencies stored in the same storage area is stored, and when the storage area is selected, the reception frequency is read and received. Therefore, the operator only needs to select the storage area,
Tuning can be performed with simple operation. (2) According to the second and third aspects of the present invention, one receiving frequency is automatically selected from a plurality of receiving frequencies stored in the storage area, so that the operator does not need to select the receiving frequency, thereby improving operability. . In particular, according to the third aspect of the present invention, the signal strength of the received radio wave is detected, and the receiving frequency with the higher signal strength is automatically selected. Is automatically selected.

(3) According to the fourth, fifth and sixth aspects of the present invention, the automatic selection operation is stopped when the signal strength at all the reception frequencies stored in the storage area is lower than a predetermined value. , The automatic selection operation can be prevented from being performed continuously. (4) According to the seventh aspect of the present invention, the automatic selection operation is prohibited by the setting of the operator, so that the automatic selection operation is performed against the operator's will when receiving at a specific reception frequency. Can be prevented. (5) In the invention of claim 8, the automatic selection operation is stopped when only one reception frequency is stored in the storage area, so that the automatic selection operation is not performed when no other reception frequency is stored. The selection operation can be prevented from being performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration of a vehicle-mounted television tuner according to a first embodiment.

FIG. 2 is a block diagram illustrating a configuration of a receiving unit.

FIG. 3 shows a storage area of a memory corresponding to a tuning switch;
FIG. 4 is a diagram illustrating an example of correspondence with frequencies stored in a storage area.

FIG. 4 is a flowchart of a reception operation performed when a tuning switch is operated.

FIG. 5 is a flowchart of a reception operation performed when an automatic tuning operation is permitted.

[Explanation of symbols]

10 ... car-mounted TV tuner 11 ... receiving unit
12: microcomputer, 13: memory,
14 operation member, 15 antenna, 111 front end unit, 112 intermediate frequency amplification unit, 113 image detection unit, 11
4… Video amplifier, 115… Audio intermediate frequency amplifier,
116: Voice detection unit, 117: MPX / amplification unit

Continued on front page F-term (reference) 5C025 AA23 BA12 BA22 BA27 CB08 DA07 5J103 AA13 CB04 CB05 FA03 GA11 GB03 HC02 JA09 MA09 5K061 AA09 BB01 BB07 GG09 GG10 JJ06 JJ07

Claims (9)

[Claims] 1. A receiving means for receiving a broadcast of a set frequency, a storing means for storing an arbitrary receiving frequency, and a frequency setting means for reading out the stored receiving frequency and setting the read receiving frequency in the receiving means. In the in-vehicle receiver, the storage means has a storage area for storing the reception frequency corresponding to one tuning switch, and the storage area stores a plurality of reception frequencies. In-vehicle receiver. 2. The receiver according to claim 1, wherein one of a plurality of reception frequencies stored in the storage area is selected.
A receiver for controlling the frequency setting means so as to automatically select one of the receiving frequencies and set the receiving frequency in the receiving means. 3. The receiver according to claim 2, wherein a signal strength detecting means for detecting a signal strength received by said receiving means, and a radio wave of a receiving frequency set by said frequency setting means is being received. When the signal strength detected by the signal strength detection means is lower than a predetermined value, another reception frequency stored in the storage area is set in the reception means, and the signal strength is higher among the other reception frequencies. Control means for controlling the frequency setting means so as to automatically select a frequency. 4. The receiver according to claim 3, wherein when all signal strengths of radio waves respectively received at the plurality of reception frequencies stored in the storage area are lower than a predetermined value,
The in-vehicle receiver, wherein the control means stops the operation of the automatic selection. 5. The receiver according to claim 4, wherein when the control means stops the operation of the automatic selection, the control means selects a reception frequency selected before performing the operation of the automatic selection, and then selects the reception frequency. An in-vehicle receiver that stops the operation of automatic selection. 6. The receiver according to claim 4, further comprising timing means for measuring a time after the operation of the automatic selection is stopped, wherein said control means controls a time measured by said timing means to be a predetermined value or more. The vehicle-mounted receiver restarts the operation of the automatic selection when it becomes. 7. The on-vehicle receiver according to claim 3, further comprising a prohibition unit for prohibiting the automatic selection operation according to an operator setting. 8. The on-vehicle receiver according to claim 3, wherein when only one reception frequency is stored in the storage area, the control means prohibits the automatic selection operation. Receiving machine. 9. A receiving means for receiving a broadcast of a set frequency, a storing means for storing an arbitrary receiving frequency, and a frequency setting means for reading out the stored receiving frequency and setting the read receiving frequency in the receiving means. A receiver for storing the reception frequency corresponding to one tuning switch; a first storage unit for storing a plurality of reception frequencies in the storage area; A second storage unit that stores a reception frequency read last from a plurality of reception frequencies stored in the storage unit, a selection unit that selects the storage region, and a storage region that is selected by the selection unit Control means for controlling the frequency setting means so that the last read reception frequency in the selected storage area is read from the second storage means and set in the reception means. And a receiver for a vehicle.