JP3350985B2 - Receiving machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an auto-tuning system based on, for example, a frequency synthesizer system or a voltage synthesizer system. In particular, the present invention relates to a receiver such as a television receiver which is moved and carried like a vehicle-mounted television or a portable television. About.

[0002]

2. Description of the Related Art Hitherto, there has been known an automatic tuning system which automatically tunes to a broadcasting station by a frequency synthesizer system or a voltage synthesizer system. For example, a voltage synthesizer system is disclosed in US Pat. No. 4,398,303. The frequency synthesizer system is USP4,3
17, 227.

According to these techniques, the operation of an "up / down" key for instructing a tuning direction causes a broadcast station having a higher frequency or a lower frequency to be broadcast from a currently received broadcast station. It is possible to automatically search and receive, or preset the broadcast station corresponding to the channel key, such as the first broadcast station A to the channel key 1, the second broadcast station B to the channel key 3, and so on. The channel can be selected with one touch by operating a channel key.

[0004] Recently, portable liquid crystal televisions and on-vehicle televisions have become widespread. This type of television receiver is used over a wide area without fixing the use area at one place. For this reason, the radio wave condition changes drastically, and the receivable broadcast stations change with the movement of the area, and there is a problem that the above-mentioned auto tuning system cannot cope with the problem.

That is, even if a specific channel (broadcasting station) is preset in advance, if the area moves, the channel cannot be received. This is because the receivable broadcast station may fluctuate due to the influence of the above.

[0006] Some television broadcasting stations have their own service areas in cities throughout the country. Each of these television broadcast stations is configured to operate a television broadcast by configuring a network system using each broadcast station as a key station.

[0007] For this reason, if only a channel number is displayed at the time of channel selection as in a conventional television receiver, if the user goes to an unknown area on a trip or a business trip, there are several types of televisions in that area. It is impossible to know at all whether there is a broadcast station, on what channel the broadcast station exists, or which TV broadcast station is in a network relationship with a TV broadcast station in your area of residence. There was a problem that it took a lot of trouble and time to find a channel.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a receiver such as a liquid crystal television receiver which is carried and carried by a broadcasting station in a destination area. It is an object of the present invention to provide a receiver whose state can be understood at a glance.

[0009]

According to the first aspect of the present invention, a plurality of channels of a television wave are automatically tuned.
And display the broadcast of the channel received sequentially
Broadcasts on the sequentially received channel
Are displayed for a predetermined period of time.
Displays the channel number of the channel and is currently being displayed.
Displayed so that the channel number of the channel can be identified
The display means is provided.

[0010]

[0011]

[0012]

According to the first aspect of the present invention, which channel is currently
Channel is available and what is actually released on that channel.
You can easily know if it has been sent.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment in which the present invention is applied to a liquid crystal television receiver will be described below with reference to the drawings.

FIG. 1 is a front view showing the external structure.
Reference numeral 10 denotes a receiver body. On the front of the receiver body 10, a display section 12 composed of a color liquid crystal display panel with a backlight, a guide (GUIDE) key 13, a preset (PRESET) key 14, and an intro (INTRO) key
15, Pause (PAUSE) key 16, Channel (CH)
Key 17, volume (VOLUME) key 18, bright (BRIGHT) key 19, auto (AUTO) key 20,
Various operation keys including an area (AREA) key 21 are provided.

The details of the guide key 13 will be described later.
It is a key for performing a guide display of channel selection, such as a list display for displaying a list of receivable channels by searching the radio wave state of the area and a network display for displaying the status of affiliated stations in each area of the country. . The preset key 14 is a key for performing an auto preset for searching for a receivable channel in the area and automatically presetting it in a memory.

The intro key 15 is a key for receiving receivable channels sequentially for a predetermined time and introducing and displaying them. Such a display operation is hereinafter referred to as intro scan. The pause key 16 is a key for temporarily stopping the displayed channel when the above intro scan is performed. The channel key 17 is a key for designating channel selection by auto tuning, and includes two keys, a "+" key and a "-" key, corresponding to the channel selection direction. The volume key 18 is a key for adjusting the volume level, and also includes two keys, a "+" key and a "-" key, according to the adjustment direction.

The bright key 19 is a key for adjusting the brightness level of the television image displayed on the display unit 12, and is also a "+" key and a "-" key corresponding to the adjustment direction.
It consists of two keys.

An auto key 20 is a key for designating an auto tuning mode for executing the auto tuning, and an area key 21 is a key for designating an area tuning mode for performing the network display or the like according to the area.

FIG. 2 is a block diagram showing the overall circuit configuration. In the figure, a television broadcast wave received from an antenna 31 is sent to a tuner 32. This tuner 32 will be described later with reference to FIG.
In accordance with the tuning signal TS from the control unit 39 described in detail below, a TV broadcast radio wave of a specified channel is selected, converted into an intermediate frequency signal and transmitted to the intermediate frequency amplifier circuit 33, and a local oscillation frequency signal is Send fOSC.

The intermediate frequency amplifying circuit 33 amplifies the intermediate frequency signal from the display unit 12 and outputs the amplified signal to the video detecting circuit 34.
The video detection circuit 34 performs video detection on the amplified intermediate frequency signal from the intermediate frequency amplification circuit 33 and returns it to a composite video signal including a composite audio signal, and converts the composite video signal into a chroma signal processing circuit 35 and a synchronous signal processing circuit. Circuit 38 and voice detection circuit 40
And outputs the automatic frequency tuning signal AFT to the control unit 39.

The audio detection circuit 40 performs audio detection on the composite video signal from the video detection circuit 34 to obtain an audio signal, and sends this audio signal to the volume adjustment circuit 41. The volume adjustment circuit 41 adjusts the volume level of the audio signal from the audio detection circuit 40 according to the audio control signal VS input from the control section 39, and outputs the audio signal to the audio amplification circuit 42. The audio amplifier circuit 42 amplifies the audio signal from the volume adjustment circuit 41 at an appropriate constant amplification factor, and drives the speaker 43 with the obtained audio signal to reproduce and output audio.

The synchronizing signal processing circuit 38 includes a video detecting circuit.
The horizontal synchronizing signal and the vertical synchronizing signal are extracted from the composite video signal from the
Output to

In accordance with the horizontal and vertical synchronizing signals from the synchronizing signal processing circuit 38 and the color control signal VC input from the control section 39, the chroma signal processing circuit 35 generates a chroma signal for the composite video signal from the video detecting circuit 34. Processing is performed to obtain R, G, B color signals, and these color signals are sent to the display drive circuit 36. The display drive circuit 36 controls the R, G, B color signals from the chroma signal processing circuit 35 and the control unit 39.
And superimposes the character data signal CD input from the PC, and drives the display unit 12 to display a television broadcast or the like by using the superimposed signal.

However, the control unit 39 controls the guide key 13
Preset key 14, Intro key 15, Pause key 16, Channel key 17, Volume key 18, Bright key 19,
A control operation is performed in response to a key operation signal KD from a key input unit 44 composed of an auto key 20 and an area key 21. The control signal is sent to each of the circuits while appropriately rewriting the contents of the memory unit 45. The memory unit 45 is configured by a non-volatile memory, for example, an EEPROM, and stores reception channel information, mode information, volume level information, bright level information, and the like at the time of power stop.

FIG. 3 shows a detailed circuit configuration of the control section 39. As shown in the figure, a control unit 39 is constituted by a microcomputer, and a central CPU 51 is connected to a ROM 52 storing an operation program, a RAM 53 having various registers for performing data processing, and the memory unit 45. At the same time, the key operation signal KD from the key input unit 44, the vertical synchronization signal (Vsync) from the synchronization signal processing circuit 38, and the operation clock fREF from the oscillator 54
Is directly input.

However, the local oscillation frequency signal fOSC from the tuner 32 is input to the frequency divider 56 after being frequency-divided by the prescaler 55 to, for example, about 1/8. This divider 56
The CPU 51 sets a frequency division ratio corresponding to the designated channel, thereby performing frequency division.
Output to The phase comparator 57 compares the phase of the signal with the frequency-divided signal of the frequency divider 56 based on the operation clock fREF from the oscillator 54, smoothes the error signal EO via a low-pass filter (LPF) 58, and smoothes the error signal EO. A tuning signal TS is generated and output to the tuner 32. That is, the frequency divider 56, the phase comparator 57, and the low-pass filter
A PLL circuit is constituted by 58, and the CPU 51 controls the operation of this PLL circuit and outputs a tuning signal T.
Generate S.

An automatic frequency tuning signal AFT from the video detection circuit 34 is digitized by an A / D converter 59 and input to the CPU 51, and the color of the digital value corresponding to the operation of the bright key 19 is input from the CPU 51. Control signal is PWM
An audio control signal of a digital value corresponding to the operation of the volume key 18 is output to the PWM circuit 61 to the circuit 60.

The PWM circuit 60 performs pulse width modulation of the digital color control signal, smoothes the obtained pulse width signal through a low-pass filter (LPF) 62, and generates the color control signal VC which is a voltage signal. , To the chroma signal processing circuit 35. That is, the PWM circuit 60 and the low-pass filter
62 constitutes a D / A converter.

Similarly, the PWM circuit 61 performs pulse width modulation on the digital audio control signal, smoothes the obtained pulse width signal via a low-pass filter (LPF) 63, and generates a voltage signal as the audio control signal. VS is generated and output to the volume adjustment circuit 41. That is, the PWM circuit 61 and the low-pass filter 63 constitute a D / A converter.

Further, the CPU 51 outputs display data in character codes to a character generator (CG) 65. Based on the horizontal synchronization signal Hsync and the vertical synchronization signal (Vsync) input from the synchronization signal processing circuit 38, the character generator 65 uses the display data to display R, G, and R for displaying a list of reception channels, network display, and the like. A character data signal CD based on each dot pattern B is generated and output to the display drive circuit 36. Next, the operation of the first embodiment will be described. <Description of overall operation>

FIG. 4 mainly shows the overall operation processing after the power is turned on, which is performed by the CPU 51 of the control section 39 in accordance with the operation program stored in the ROM 52. At the beginning of operation,
First, the reception channel information, the mode information, the volume level information, and the brightness level information at the time of the previous power stop stored in the memory unit 45 are read out as the last mode information (step A1). The receiving operation is executed (step A2). afterwards,
It is determined whether the mode is the auto tuning mode or the area tuning mode (step A3).
). If the mode is the auto-tuning mode, a key operation is waited for next, and when the key is actually operated, it is determined what key was operated (step A4).

Here, the operated key is a channel key.
If it is determined to be 17, auto-tuning is performed according to the “+” or “−” direction corresponding to the operation, and
The receiving channel is updated and set (step A5). The detailed operation of the automatic tuning operation will be described later. Then, after the receiving channel is updated by the automatic tuning, the process proceeds to step A4 in FIG. 4 to be in a standby state for key operation.

If it is determined in step A4 that the key operated is the guide key 13, then the display unit 12
To determine whether or not the list is being displayed (step A).
6). If the list is being displayed, the operation of the guide key 13 determines that any of the receivable channels displayed in the list has been designated by auto tuning, and proceeds to step A5 to execute auto tuning. I do. Thereafter, the flow advances to step A4 to enter a key operation standby state.

If it is determined in step A6 that the operation of the guide key 13 has been performed when the display unit 12 is not displaying the list, a process for displaying the list is executed again. The detailed operation of this list display operation will be described later. Then, after the list display processing, the above step A
Proceed to step 4 to wait for key operation.

If it is determined in step A4 that the key operated is the preset key 14, then an auto preset process is executed. The detailed operation of the auto preset operation will be described later. Then, after the auto-preset processing, the process proceeds to step A4 to be in a standby state for key operation.

If it is determined in step A4 that the key operated is the intro key 15, an intro scan process is executed (step A9). The detailed operation of the intro scan will be described later. Then, after the intro scan processing, the process proceeds to step A4 to be in a standby state for key operation.

If it is determined in step A4 that the area key 21 has been operated, the automatic tuning mode is released and the mode is shifted to the area tuning mode. A decision is made (step A10).

However, if it is determined that the key operated in step A10 is the "+" key or "-" key of the channel key 17, the receivable channel stored and set in the memory unit 45 by the processing in step A8 is executed. The data is read, up-tuning or down-tuning is performed in the direction corresponding to the "+" key or the "-" key from the currently received and displayed channel, and the television broadcast of the corresponding channel is received (step A).
11). Thereafter, the process returns to the key operation waiting in step A10.

When it is determined that the key operated in step A10 is the guide key 13, a network display process is executed (step A12). The detailed operation of this network display operation will be described later. Then, after the network display processing, the process returns to waiting for key operation in step A10.

If it is determined in step A10 that the auto key 20 has been operated, the area tuning mode is released and the mode shifts to the auto tuning mode. A decision is made (step A10). <Description of auto tuning operation>

First, the control operation of the automatic tuning will be described with reference to FIGS. FIG. 5 shows the reception frequency and AF
FIG. 6 is a flowchart showing an auto-tuning control operation at the time of up-tuning by operating a “+” key of the channel keys 17.

Assuming that the "+" key of the channel keys 17 is operated in the state where the n channel is being received, the CPU 51 in the control unit 39 executes the tuning control operation shown in FIG. First, the CPU 51 sets the frequency divider so that the tuner 32 tunes to a frequency obtained by adding P (kHz) to the center frequency fi of the next channel, that is, the “n + 1” channel (this is the i channel).
The frequency division ratio is set to 56, and the tuning signal TS is transmitted to the tuner 32 (step B1). The above P (kH
The frequency z) is set to, for example, about 200 (kHz).

When a broadcast wave is present on the i channel, at the reception frequency of "fi + P (kHz)", the voltage level of the AFT is lower than the lower limit reference voltage VL as shown in FIG. It falls below. At this time, the voltage value of the AFT signal is stable without being affected by the modulation degree of the video signal. Then, the above-mentioned “fi + P (kH
z)) to check whether the AFT voltage at the tuning frequency is equal to or lower than a preset threshold value VTH (step B2).
), It is determined whether or not the i-channel broadcast wave exists.

In step B2, if it is determined that the AFT voltage is not lower than the threshold value VTH,
Since there is no broadcast wave in the channel, the reception channel i at that time is updated and set to "+1" (step B3). Thereafter, the flow returns to step B1, and the next "i +
The presence / absence of a broadcast wave is checked for channel "1" in the same manner as described above.

On the other hand, in step B2, the AFT
When it is determined that the voltage is equal to or lower than the threshold value VTH, there is a broadcast wave for the reception channel (i-channel) at that time, and the CPU 51 sets the tuning frequency of the tuner 32 to the i-channel. The frequency division ratio for the frequency divider 56 is set, and the tuning signal TS is supplied to the tuner 32.
(Step B4). Thus, the tuning operation by the control unit 39 is completed.

In the flowchart of FIG. 6, the auto tuning operation when the "+" key of the channel keys 17 is operated is shown. However, when the "-" key is operated, "i + 1" in step B3 is executed. By performing the process of "i-1" in place of the process of "", the auto-tuning operation at the time of down-tuning can be performed in the same manner as in the above case.

According to the above auto-tuning operation, the AFT voltage value at a frequency higher by P (kHz) from the center frequency of the broadcast wave maintains a stable value without being affected by the video signal. Even if it is a broadcast wave, it is possible to select a station without fail.

In the operation of FIGS. 5 and 6,
While tuning to "fi + P (kHz)" during the tuning operation, the frequency is slightly deviated from the normal tuning frequency. By eliminating, it is possible to prevent the screen from becoming unsightly.

Also, instead of the processing of FIG. 6, the following processing is performed to select the next channel without receiving a broadcast wave whose electric field strength is particularly weak and the screen is disturbed. Is also good. That is, the vertical synchronizing signal Vsync from the synchronizing signal processing circuit 38 is input to the CPU 51, and after the CPU 51 makes a determination based on the AFT voltage as shown in FIG. 6, the number of pulses of the vertical synchronizing signal Vsync is counted. Try to avoid receiving poorly lit stations.

FIG. 7 is a flowchart showing this auto tuning operation. The processing of steps B1 to B4 is the same as that of FIG. 6, but the processing of step B5 is added after step B4. That is, step B
After the reception frequency is tuned to the center frequency fi of the broadcast wave by the processes of 1 to B4, it is determined in step B5 whether the number of pulses of the vertical synchronization signal Vsync from the synchronization signal processing circuit 38 is a specified number. For example, it is checked a plurality of times whether or not the number of pulses of the vertical synchronization signal Vsync received in a certain period is a specified number, and the degree of screen disturbance is determined based on the result. In step B5, the vertical synchronizing signal Vsy
If it is determined that the number of pulses of nc is not the prescribed number, and therefore the image is poor, the process returns to step B3 to select the next channel and perform the same processing as described above. If it is determined that the number of pulses of the signal Vsync is the specified number, the reception state is good, and the tuning operation ends. <Description of list display and auto preset operation>

Here, the list display in step A7 and the automatic presetting process in step A8 will be described with reference to FIG. In the figure, first, the minimum value N of the channel number and "1" in Japan are input and set to the i register provided in the RAM 53 (step C1). Next, RAM53
The initial value "0" is input and set to the j register provided in (step C2).

Next, the channel of the one-channel television signal is selected and received in accordance with the value "1" of the i register (step C).
3). Then, it is determined whether or not there is a broadcast station on the channel as a result of the reception based on the voltage level of the AFT signal from the video detection circuit 34 input via the A / D converter 59 (step C4).

If it is determined that there is no broadcast station,
After confirming that the maximum value M of the channel number and “62” in Japan are not set in the i register (step C10), the value of the i register is updated and set to “+1”. Repeat the process.

If it is determined in step C4 that there is a broadcasting station, after the value of the j register is updated and set to "+1" (step C5), the reception level exceeds a predetermined level. It is determined whether or not the reception level is strong depending on whether or not there is (step C6).

Regarding the judgment of the level of the reception level,
Although not shown, A from the AGC circuit for controlling the gain of the reception signal provided in the video detection circuit 34 is used.
A method of detecting by the signal level of the GC signal and determining whether or not the threshold value exceeds a preset threshold value, or counting the number of pulses of the vertical synchronization signal Vsync as shown in FIG. A method of making a determination based on whether or not the value is obtained can be considered.

If it is determined in step C6 that the reception level is high, the flag "1" is set in the K flag register provided in the RAM 53 (step C7), and if it is determined that the reception level is low, the K flag is set. The flag "0" is set in the register (step C8).

Thereafter, the value of the i register and the value of the K flag register are set and stored in the j-th storage area according to the value of the j register in the register for storing the search result in the RAM 53.

Further, after confirming that the maximum value M of the channel number is not set in the i register and "62" is set in Japan (step C10), the value of the i register is set to "+".
(1) Update setting and repeat the process from step C3. In the same manner, the operations of steps C3 to C11 are repeatedly executed while updating and setting the value of the i register until the value M is set in the i register.

At the point when the process of the step C1 is started, the display unit 12 displays a normal television screen as shown in FIG.
From 71, the screen shifts to a search screen 72 using the characters "SEARCH", and the display of the search screen 72 is continued while the processing of steps C3 to C11 is repeated.

While the search screen 72 is being displayed, the control unit 39 sends the audio control signal VS to the volume adjustment circuit 41.
Is set to the “0 (zero)” level, the output of the sound from the speaker 43 is temporarily stopped, and the input of the key operation signal KD from the key input unit 44 is not accepted.

When it is determined in step C10 that the maximum value M of the channel number is set in the i register,
Since the search from channel N to channel M has been completed, the receivable j channel numbers stored in RAM 53 are read out together with the value of K indicating the reception level, and a character code for displaying a list is used. The display data is created and sent to the character generator 65. The character generator 65 includes a synchronization signal processing circuit 38
Based on the horizontal synchronizing signal Hsync and the vertical synchronizing signal (Vsync) input from the base station, a character data signal CD in R, G, B dot patterns for displaying a list of reception channels is generated from the display data.
Output to the display drive circuit 36. The display drive circuit 36 drives the display unit 12 in accordance with the character data signal CD, and displays receivable channels as a list display screen 74 as shown in FIG. 11 (step C12).

Here, the display form of each channel number displayed in a list may be changed corresponding to the value of K indicating the strength of the reception level. For example, a channel number having a high reception level and a channel number having a low reception level may be color-coded, or one of a channel number having a high reception level and a channel number having a low reception level may be displayed by blinking. Alternatively, the display area on the screen may be divided into a display area with a high reception level and a reception area with a low reception level, and the corresponding channel number may be displayed in the display area on the corresponding side.

If there is no receivable channel even after the search is executed, a no-signal area screen 73 is displayed with the characters "NO SIGNAL AREA" as shown in FIG.

After executing the above list display, the CP
U51 determines whether this processing is due to the operation of the preset key 14 or the guide key 13 (step C13).

If the operation is based on the operation of the guide key 13, the process ends. In the case of the operation of the preset key 14, subsequently, the receivable j channel numbers stored in the RAM 53 are read out together with the value of K indicating the reception level, transferred to the memory unit 45 and stored and set ( Step C14), and thereafter, this processing ends. Note that, in FIG.
Although the example described above is performed only once, the search may be repeatedly performed a plurality of times. In this case, a list display screen 74 or a no-signal area screen 73 is displayed as shown in FIG.
After a minute, the search is executed again, and thereafter, the display of the list display screen 74 or the no signal area screen 73 is repeated a predetermined number of times.

By repeating the search a plurality of times in this manner, the change can be easily recognized even in a mobile object such as an automobile in which the reception status is easily changed. Also, if this list is displayed when the channel you want to watch cannot be received,
It is possible to know when the mobile terminal can receive the signal while moving. This concludes the description of the list display and the operation of the auto preset. <Description of Intro Scan Operation> FIGS. 9 and 10 show an intro scan process, and FIG. 12 shows each display screen on the display unit 12 during the process.

That is, the normal television screen shown in FIG.
When the intro key 15 is operated while 81 is displayed,
The process of FIG. 9 is started. In FIG. 9, “SE
A search screen 82 using the characters "ARCH" is displayed on the display unit 12 (step D1), and thereafter a search process by auto-tuning is executed (step D2). Since this search process is the same as steps C1 to C11 in FIG. 8 and the description thereof is omitted, the total number of channels determined to be receivable is simultaneously stored in the JO register provided in the RAM 53.

After executing the search processing, the CPU 51
The presence / absence of a receivable channel is determined based on the presence / absence of the channel number stored in step (D3). When it is determined that there is no receivable channel, a no signal area screen 83 in the form of "NO SIGNALAREA" is displayed on the display unit 12 as shown in FIG. 12 (step D4), and the introscan processing is completed. I do.

If it is determined that there is a receivable channel, the key operation is awaited for a predetermined time (step D5). If there is no key operation, one intro processing shown in FIG. 10 is executed (step D6).

That is, in FIG.
The initial value "1" is set in the j register (step E1).
), The display screen of the display unit 12 is scrolled sequentially from the right side using the black image from the character generator 65 to execute a display in which the display screen is filled in black (step E2). Then j
According to the value of the register, the j-th channel number i stored in the RAM 53 is read together with the value of K indicating the reception state (step E3).

With the read channel number i, the tuner 32 actually receives the i-channel television broadcast (step E4). Then the character generator
The display screen of the display unit 12, which is painted black with the black image from step 65, is sequentially released from the right side by scrolling (step E).
Five ). When the entire screen is released, the screen starts as shown in FIG. 12, for example, a television screen 84 of one channel is displayed.

At this time, the CPU 51 simultaneously reads out all the values indicating the other channel numbers from the storage area of the RAM 53, and displays a list of the receivable channel numbers searched therebelow as shown on the television screen 84 of FIG. Then, of the channel numbers displayed in the list, only the channel numbers read out in step E3 are displayed as those corresponding to the currently displayed television screen, for example, by blinking or color coding.

When the entire television screen 84 is displayed, it is determined whether or not the value of K indicating the reception state read out together with the channel number i in step E3 is "1". It is determined whether the reception level is high (step E6).

If the value of K is "1", the reception level of the channel being displayed is high, and the display of the television screen 84 is continued for a predetermined time, for example, 5 seconds (step E7). .

If the value of K is "0" instead of "1", the reception level of the displayed channel is low. Therefore, a predetermined time which is clearly shorter than the predetermined time, for example, 3 seconds Only, the display of the television screen 84 is continued (step E8).

After elapse of 5 seconds or 3 seconds, j
When the value of the register is stored in the RAM at the time of the search in
It is confirmed that the currently displayed channel is not the last receivable channel obtained by the search by checking whether or not the value is equal to the value JO stored in the JO register 53 (step E9). Set the value of the j register to “+
1) Update setting (step E10).

Thereafter, similarly, the value of the j register is sequentially updated and the processing of steps E2 to E10 is repeatedly executed until the value becomes equal to the value stored in the JO register, thereby searching as shown in the television screens 85 to 88. The receivable channels are scrolled through the black image to switch the screen, and are sequentially displayed at intervals according to the reception level.

Then, the television screen of the last receivable channel searched is displayed, and when the display is determined that the value of the j register is equal to the value stored in the JO register (step E10), this processing is completed. I do.

In FIG. 9, at step D6, the above-mentioned FIG.
0, the intro display is executed, and it is determined whether or not the processing has been completed as appropriate (step D7), and the key operation is kept waiting in step D5. The process of D7 is repeatedly executed, and when it is determined that the process of the intro display is completed (step D7), the intro scan process of FIG. 9 is also completed.

If the "+" key or the "-" key of the channel key 17 is operated during the intro display, it is determined (step D5), and the channel displayed at that time is determined. Up-tuning or down-tuning is performed in the direction corresponding to the "+" key or "-" key (step D8), and thereafter, the process returns to the standby state of the key operation in step D5.

Further, if the pause key 16 is operated while the intro display is being performed, this is determined (step D5), and step E7 of the intro processing of FIG. 10 is determined.
Alternatively, the intro process is temporarily stopped by continuously resetting the display time count in step E8, and the television screen of the channel at that time is continuously displayed (step D9). Thereafter, the pause state is released by operating the pause key 16 again (step D10). When the pause key 16 is actually operated again, the above-described step D is performed.
Return to waiting for key operation at 5.

Although FIGS. 9 and 10 show an example where the searched receivable channel is displayed only once in the intro scan, the intro scan display may be repeatedly executed a plurality of times. . in this case,
As shown in FIG. 12, after the television screen 88 of the last receivable channel searched for is displayed for 5 seconds or 3 seconds in accordance with the reception level, the display returns to the search screen 82 again, and thereafter the introductory screen is repeated a predetermined number of times. The scan display is repeated.

By repeating the intro scan display a plurality of times in this way, the intro scan display is performed again after viewing all the receivable channels on the television screen, and an arbitrary channel or a channel in the vicinity thereof is displayed. By operating the pause key 16 or the channel key 17 at the time, a desired channel can be selected. This concludes the description of the intro scan operation. <Description of network display operation>

FIG. 13 shows the details of the network display processing. At the beginning of the processing, the display data of the area selection screen is first read (step F1), and the character data is generated by the character generator 65 to the display section 12 (step F1).
Is displayed (step F2).

That is, in the ROM 52 of the control unit 39, display data of an area selection screen showing a map obtained by dividing the whole country into each region such as “Hokutodo”, “Tohoku”, “Kantou”. It is memorized.

FIG. 14A shows an area selection screen for the region “Chubu (Chubu)”. As shown in the figure, the map graphic of the whole country is displayed in a simplified dot pattern along with the character of "Chubu", and the part corresponding to the central region is displayed separately from other regions by color coding (indicated by hatching in the figure) Is done.

The key operation is awaited while the area selection screen is displayed. And when key operation is performed,
It is determined whether or not the key is used to designate a region by, for example, the "+" key or "-" key of the channel key 17 (step F3).

If it is determined that a key operation for designating a region has been performed, a region selection screen for another new region is displayed in accordance with the direction of the "+" key or the "-" key. The process from step F1 is repeated in order to cause the above.

For example, when the "+" key of the channel key 17 is operated while the area selection screen of the Chubu region shown in FIG. When the "-" key is operated, an area selection screen for the Kanto region is displayed.

In this manner, the processing of steps F1 to F3 is repeatedly executed, and the key operation for selecting an instruction displays the desired local area selection screen on the display unit 12, and the "+" key of the channel key 17 is displayed. Alternatively, when a key other than the "-" key is operated, the CPU 51 determines this (step F3) and determines whether or not the operation key is an instruction for determining the displayed area, for example, the pause key 16. Is determined (step F4).

In this state, no key operation other than the pause key 16 is accepted, and the apparatus stands by until the pause key 16 is operated. When the pause key 16 is operated, the display data of the city name selection screen is read out (step F5), and the character data is generated by the character generator 65 and displayed on the display unit 12 (step F6). That is, in the ROM 52 of the control unit 39, display data of a city name selection screen indicating a main city belonging to each area is stored in advance corresponding to each area selection screen.

FIG. 14B shows a city name selection screen corresponding to the area selection screen of the central region of FIG. 14A. As shown in the figure, the characters of "Niigata", "Toyama", "Kanazawa", "Nagano", "Shizuoka", and "Nagoya" are displayed as the names of the cities belonging to the Chubu region. Are displayed separately by city name and color coding.

The key operation is waited while the city name selection screen is displayed as described above. Then, when a key operation is performed, it is determined whether or not the key is for selecting and instructing a city name by, for example, a "+" key or a "-" key of the channel key 17 (step F7).

If it is determined that the key operation by the channel key 17 for selecting and instructing the city name has been performed, the city name displayed corresponding to the direction indicated by the "+" key or the "-" key is determined. Of these, the processing from step F6 is repeated in order to move those which are displayed in different colors.

For example, in a state in which the city name selection screen of the Chubu region shown in FIG. 14B is displayed, and in particular, the character “Niigata” is displayed in a color-coded manner with other city names, for example, When the "+" key of the channel key 17 is operated, the character "Toyama" is displayed by color, and when the "-" key is operated, the character "Nagoya" is displayed separately by color coding. Is what you do.

In this way, the processing of steps F6 and F7 is repeatedly executed, and the character of the desired city name is displayed separately by the key operation for the selection instruction, and the "+" key or the "-" key of the channel key 17 is displayed. When a key other than the key is operated, the CPU 51 determines this (step F7).
), It is determined whether or not the operation key is an instruction for determining a city name which is displayed separately, for example, a pause key 16 (step F8).

In this case, the pause key 16 and the auto key 20,
Key operations other than the area key 21 are not accepted, and although not shown, when the auto key 20 or the area key 21 is operated, the operation directly proceeds to the receiving operation. Then, when the pause key 16 is operated, the display data of the network guide screen is read out (step F9), and the character data is generated by the character generator 65 and displayed on the display unit.
It is displayed at 12 (step F10).

That is, in the ROM 52 of the control section 39, the network number indicating the channel number of the broadcasting station belonging to the city name and the name of the key station in the same network series as the broadcasting station are stored in the ROM 52 corresponding to the respective city name selection screens. The display data of the guide screen is stored in advance.

FIG. 14C shows a network guide screen corresponding to "NIIGATA" which is displayed in different colors in FIG. 14B. As shown in the figure, Niigata has “5 (channel) TBS”, “8 (channel) NHK”, “12 (channel) NHK-Kyoiku”, “21 (channel) TV Asahi”, and “29 (channel). ) NTV system "and" 35 (of channel) Fuji system "are displayed, and the broadcasting station, for example," 5 TBS system "is displayed separately from other broadcasting stations by color coding.

In displaying the network guide screen, steps C1 to C11 in FIG. 8 are executed.
The same automatic search processing as that shown in (1) is executed, and the reception level of each broadcasting station displayed on the network guide screen is detected and stored in the RAM 53. Based on the stored information indicating the reception level, as shown in FIG. 14 (C), a broadcast station having a high reception level in the network guide screen displays a certain mark indicating that, for example, “★”. Let it.

In this manner, key operation is awaited while the network guide screen is displayed. When a key operation is performed, the key is, for example, “+” of the channel key 17.
It is determined whether or not the broadcast station is selected by the key or the "-" key (step F11).

Here, if it is determined that the key operation by the channel key 17 for selecting and instructing the broadcast station has been performed, the broadcast station displayed corresponding to the pointing direction of the "+" key or the "-" key. Of these, the processing from step F10 is repeated in order to move those which are displayed in different colors.

[0104] In this case, for example, the network guide screen of Niigata shown in FIG. 14C is displayed, and in particular, the characters “5 TBS” are displayed separately from other broadcasting stations by color coding. "+" Of channel key 17
When the key is operated, the character "8 NHK" is displayed by color, and when the "-" key is operated, the character "35 Fuji" is displayed by color coding. . Thus, the above steps F10 and F11
Is repeatedly executed, and when a key other than the "+" key or the "-" key of the channel key 17 is operated in a state where the character of the desired broadcast station is displayed in a divided manner by the key operation for the selection instruction. The CPU 51 determines this (step F7), and determines whether or not the operation key is an instruction for determining the broadcast station being displayed in a divided manner, for example, the pause key 16 (step F12).

In this case, no key operation other than the pause key 16 is accepted, and the process waits until the pause key 16 is operated.
Then, when the pause key 16 is operated, the tuning signal TS is transmitted to the tuner 32 based on the information of the determined broadcasting station, and the receiving operation of the broadcasting station is executed (step F13). To end.

In the network guide screen,
As shown in FIG. 14C, an example is shown in which the channel number of the broadcasting station and the name of the key station of the network series corresponding to the city name are displayed for each city name. Whether to correspond to a broadcasting station can be stored in the memory unit 45.

FIG. 15 shows an example of a network guide screen indicating which of the broadcast stations serving as the key stations in “Tokyo (Tokyo)” corresponds to the broadcast station in “Niigata (Niigata)”. By enabling such a network guide screen to be displayed, more users receive television on unknown lands, regardless of users living in urban areas or in rural areas. In case,
It becomes possible to select a station after knowing a desired broadcasting station.

In the first embodiment, as a method of detecting the reception level of each broadcasting station, a method of detecting the signal level of an AFT signal obtained by AFT detection, a method of counting pulses of a vertical synchronizing signal for a predetermined time, and performing a normal operation. Although the method of comparing with the number of pulses has been shown, it is also possible to repeatedly execute a search by auto tuning a plurality of times and determine how many times the broadcast station can be received in the plurality of searches. Conceivable. Hereinafter, this detection method is shown in FIG.
Indicated by 6.

That is, in FIG. 16, the auto search shown in steps C1 to C11 in FIG. 8 is repeatedly executed n times (steps G1 to G4). The RAM53
To be stored. Then, the channel number of each broadcasting station and the number of times of reception thereof, which are stored in the RAM 53, are read out, and a receivable screen 91 as shown in the figure is displayed on the display unit 12 (step G5).

In this receivable screen 91, it is assumed that, for example, “1 (channel)”, “3 (channel)”, “4 (channel)”, and “6 (channel)” can be received, and the reception level is set to “ 5 and are displayed in correspondence with characters "A" to "E".

In this case, of course, the reception level of the broadcast station which could be received n times by n searches is “A”, n
The reception level of the broadcast station that has been received only once by the search is “E”. By knowing the reception level, the user can select and select a broadcasting station having a good reception state.

In the above-described embodiment, an example in which functions such as network display are realized by a television receiver is described. However, the present invention is not limited to a television receiver, and is applicable to a radio receiver having a display unit. Of course, it is. [Second Embodiment] A second embodiment in which the present invention is applied to a liquid crystal television receiver will be described below with reference to the drawings.

FIG. 17 shows the circuit configuration.
In the figure, a television broadcast wave received by an antenna 101 is sent to a tuner 102. The tuner 102 includes a tuning circuit 102a, an amplification circuit 102b, a mixing circuit 102c, and a local oscillation circuit.
It consists of 102d. The television broadcast wave from the antenna 101 is input to the tuning circuit 102a. This tuning circuit 102a
A high-frequency signal of a specified channel is selected from a television broadcast wave on which high-frequency signals of a plurality of channels are superimposed in accordance with a tuning bias signal from a reception state display control circuit 107, which will be described later, and transmitted to an amplifier circuit 102b. Amplifier circuit
102b amplifies the transmitted high frequency signal of the designated channel with an amplification factor in accordance with an AGC signal from an AGC circuit 106, which will be described later, and amplifies the signal to a constant voltage level, and sends the signal to the mixing circuit 102c. The mixing circuit 102c combines the transmitted high-frequency signal with the local oscillation frequency signal input from the local oscillation circuit 102d, converts the signal into an intermediate frequency signal, and outputs the intermediate frequency signal to the video / audio separation circuit 103.

The video / audio separation circuit 103 separates the input intermediate frequency signal into an audio intermediate frequency signal and a video intermediate frequency signal, and converts the audio intermediate frequency signal into an audio signal processing circuit 105.
And outputs the video intermediate frequency signal to the video signal processing circuit 104.

The audio signal processing circuit 105 amplifies the input audio intermediate frequency signal and then performs processing such as FM detection to obtain an original audio signal. The audio signal is supplied to a speaker (not shown) to be driven. , And make a loudspeaker output.

The video signal processing circuit 104 includes a video intermediate frequency amplification circuit 104a, a detection circuit 104b, and a composite video signal processing circuit.
Consists of 104c. The video intermediate frequency signal from the video / audio separation circuit 103 is input to the video intermediate frequency amplification circuit 104a. The video intermediate frequency amplifying circuit 104a amplifies the video intermediate frequency signal with an appropriate amplification factor and sends the amplified signal to the detection circuit 104b.

The detection circuit 104b detects the amplified video intermediate frequency signal and returns it to a composite video signal. The composite video signal processing circuit 104c and the external AGC
Send to circuit 106. The composite video signal processing circuit 104c performs luminance signal processing, color signal processing, synchronization signal processing, and the like on the composite video signal to obtain a video signal based on R, G, and B color signals. Output to

The AGC circuit 106 includes a detection circuit 10
Based on the composite video signal from 4b, an AGC signal for controlling the gain of the received signal to be constant is generated, and this AGC signal is output to the amplifier circuit 102b and the reception state display control circuit 107 of the tuner 102.

The reception state display control circuit 107 has a signal level detection section 107a and a comparison section 107b. The AGC signal from the AGC circuit 106 is input to the signal level detection unit 107a.
The signal level detection unit 107a detects the signal level of the AGC signal in order to detect the reception state of the channel being received, and sends the detected signal level to the comparison unit 107b.
The comparison unit 107b compares the signal level from the signal level detection unit 107a with a preset reference level, and outputs the comparison result to the storage circuit 108 in the form of a video signal.

The storage circuit 108 includes the reception state display control circuit 10
The video signal indicating the comparison result input from the comparison unit 107b of No. 7 is sequentially stored. That is, the storage circuit 108 stores a video signal indicating whether the reception state is good or bad for each reception channel, and the stored content is output to the switching circuit 109.

The switching circuit 109 is connected to the video signal processing circuit 10
One of the video signal of the television broadcast input from the composite video signal processing circuit 104c and the video signal indicating the reception state input from the storage circuit 108 is supplied to the monitor 110 under the control of a control circuit (not shown). The monitor 110 displays the video signal sent via the switching circuit 109 on the screen. Next, the operation of the second embodiment will be described.

After the television broadcast wave is received by the antenna 101 and an arbitrary designated channel is selected by the tuning circuit 102a of the tuner 102 in accordance with the tuning bias signal from the reception state display control circuit 107, the amplifier circuit
Mixing circuit 10 amplified to a certain level via 102b
Sent to 2c. The mixing circuit 102c combines the amplified high-frequency signal and the local oscillation frequency signal sent from the local oscillation circuit 102d, converts the signal into a predetermined intermediate frequency signal, and outputs the signal to the video / audio separation circuit 103.

The video / audio separation circuit 103 separates the intermediate frequency signal into an audio intermediate frequency signal and a video intermediate frequency signal, and outputs the audio intermediate frequency signal to the audio signal processing circuit 105 and the video intermediate frequency signal to the video signal processing circuit. Output to 104. The audio signal processing circuit 105 obtains the original audio signal by the above-described processing,
This is supplied to a speaker (not shown) to output a loudspeaker.

On the other hand, in the video signal processing circuit 104, the video intermediate frequency signal is amplified via the video intermediate frequency amplification circuit 104a and then detected by the detection circuit 104b, and the luminance signal, the carrier chrominance signal and the synchronization signal are combined. A composite video signal is obtained and the composite video signal processing circuit 104c and the video signal
It is sent to the GC circuit 106. Composite video signal processing circuit 104c
Performs a luminance signal process, a color signal process, a synchronization signal process, and the like on the composite video signal to obtain a video signal for displaying a video, and outputs the video signal to the switching circuit 109.

The AGC circuit 106 controls the gain of the received signal based on the composite video signal so that the signal level of the video and audio signals does not fluctuate.
A GC signal is generated, and the AGC signal is transmitted to the tuner 102.
And the signal level detection unit 107a of the reception status display control circuit 107. The signal level detection unit 107a detects the signal level of the AGC signal from the AGC circuit 106, and sends the detection result to the comparison unit 107b.

FIG. 18 shows the relationship between the reception electric field of the television broadcast wave and the signal level of the AGC signal. As shown in the figure, the signal level of the AGC signal decreases as the signal level of the television broadcast wave increases and the receiving electric field increases. This is a natural result that if the receiving electric field is strong (the receiving state is good), a constant signal level can be obtained without increasing the amplification factor in the amplifier circuit 102b. Assuming that the quality of the image quality is divided at the level P point in the figure, the point P is set as a reference voltage in the comparison unit 107b, and the quality of the reception state is compared with the signal level of the AGC signal. can do.

FIG. 20 shows the processing of detecting the reception level for the reception of one channel. At the beginning of the process, it is first determined whether or not the designated channel is receivable based on the presence or absence of a broadcast wave (step S1).
At 7a, the signal level of the AGC signal from the AGC circuit 106 at that time is detected. Then, the signal level detected by the comparing section 107b is compared with the predetermined level P point (reference voltage) (Step S2).

Here, if it is determined that the signal level of the AGC signal is lower than the reference voltage, the reception state is good. Therefore, according to the determination result, the display information indicating the corresponding channel number and the reception state are good. The monitor color indicated, for example, blue display information is set as a set (step S3) and stored in the storage circuit 108 composed of a VRAM (step S5).

If it is determined in step S2 that the signal level of the AGC signal is higher than the reference voltage, the reception state is bad. Therefore, the display information indicating the corresponding channel number and the reception state are changed according to the determination result. For example, display information of a red monitor color indicating a bad condition is set as a set (step S4) and stored in the storage circuit 108 composed of a VRAM (step S5).

Thereafter, the reception of the next channel is set and received by the tuning bias signal from the reception state display control circuit 107 to the tuning circuit 102a, and the process from step S1 is executed again.

As described above, the processing of steps S1 to S5 is repeatedly executed, and the designated channels are sequentially updated and set, so that the reception states of all receivable channels are stored in the storage circuit 108. And
The content stored in the storage circuit 108 is read out and supplied to the switching circuit 109 as a video signal.

Here, when the switching circuit 109 switches and selects the video signal from the storage circuit 108 and sends it to the monitor 110 by a control circuit (not shown), the monitor 110 displays, for example, the number of a receivable channel as shown in FIG. Are displayed in a list in a color-coded state according to the quality of the reception state.

In FIG. 19, the receivable channel numbers are "1,""3,""4,""6,""8,""10," and "12."
This indicates that the reception states of “4”, “6”, “8”, and “10” are particularly good.

In the above-described embodiment, an example is shown in which the receivable channel numbers are displayed in that order, and are displayed in different colors according to the quality of the reception state. However, the present invention is not limited to this. One of the number of the channel with good reception and the number of the channel with poor reception may be displayed in a blinking manner, or the display area on the screen may be divided into two parts depending on whether the reception is good or not. It may be displayed in the area, and various other display modes can be considered.

[0135]

As described in detail above,

[0136]

According to the first aspect of the present invention, it is possible to reproduce
Number of channels received by auto tuning,
On the receiver that displays the broadcast of the next received channel
Display the broadcasts of the channels received sequentially for a predetermined time.
Channels of multiple channels that can be received while
Channel number and the channel of the currently displayed channel.
Display means for displaying channel numbers so that they can be identified
Because of the digits, it is possible to easily know which channel is currently receivable and what is actually being broadcast on that channel.

[0138]

[0139]

[Brief description of the drawings]

FIG. 1 is a front view showing an external configuration according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the overall circuit configuration according to the embodiment.

FIG. 3 is a block diagram showing a detailed circuit configuration in a control unit of FIG. 2;

FIG. 4 is a flowchart showing the entire processing content according to the embodiment.

FIG. 5 is a view showing an AFT voltage waveform according to the embodiment.

FIG. 6 is an exemplary flowchart showing processing contents of auto tuning according to the embodiment.

FIG. 7 is a flowchart showing another processing content of the auto tuning according to the embodiment.

FIG. 8 is a flowchart showing processing contents of a list display and an auto preset in FIG. 4;

FIG. 9 is a flowchart showing processing contents of the intro scan of FIG. 4;

FIG. 10 is a flowchart showing processing contents of an intro display of FIG. 9;

FIG. 11 is an exemplary view showing a state of a television screen displayed in the list display processing of FIG. 8;

FIG. 12 is an exemplary view showing a state of a television screen displayed in the intro display processing of FIG. 10;

FIG. 13 is a flowchart showing processing contents of the network display of FIG. 4;

FIG. 14 is an exemplary view showing a state of a television screen displayed in the network processing of FIG. 13;

FIG. 15 is an exemplary view showing a state of another television screen displayed in the network processing of FIG. 13;

FIG. 16 is an exemplary view showing another method of detecting and displaying a reception level according to the embodiment.

FIG. 17 is a block diagram showing an overall circuit configuration according to a second embodiment of the present invention.

FIG. 18 is a diagram showing a relationship between a reception electric field and an AGC signal voltage according to the embodiment.

FIG. 19 is an exemplary view showing a list display state of receivable channels according to the embodiment.

FIG. 20 is an exemplary flowchart showing the processing contents of display control of a reception state according to the embodiment.

[Explanation of symbols]

10 ... Receiver body, 12 ... Display unit, 13 ... Guide (GUID)
E) key, 14 ... Preset key, 15 ...
Intro scan (INTRO) key, 16 ... Pause (P
AUSE) key, 17 ... channel (CH) key, 18 ... volume (VOLUME) key, 19 ... bright (BRI)
GHT) key, 20: AUTO key, 21: Area key, 31: Antenna, 32: Tuner, 33
... Intermediate frequency amplifier circuit, 34 ... Video detection circuit, 35 ... Chroma signal processing circuit, 36 ... Display drive circuit, 38 ... Synchronous signal processing circuit, 39 ... Control unit, 40 ... Audio detection circuit, 41 ... Volume adjustment circuit, 42 ... Sound amplification circuit, 43 ... Speaker, 45 ... Memory, 51 ... CPU, 52 ... ROM, 53 ... RAM, 54 ... Oscillator, 55 ... Prescaler, 56 ... Divider, 57 ... Phase comparator,
58, 62, 63: Low-pass filter (LPF), 59: A / D
Converter, 60, 61: PWM circuit, 65: Character generator (CG), 101: Antenna, 102: Tuner, 102a
... Tuning circuit, 102b ... Amplifying circuit, 102c ... Mixing circuit, 102d ...
Local oscillation circuit, 103: Video / audio separation circuit, 104: Video signal processing circuit, 104a: Video intermediate frequency amplification circuit, 104b: Detection circuit, 104c: Composite video signal processing circuit, 105: Audio signal processing circuit, 106: AGC Circuit, 107 ... Reception state display control circuit, 107a ... Signal level detector, 107b ... Comparator, 108 ...
Storage circuit, 109 ... switching circuit, 110 ... monitor.

──────────────────────────────────────────────────続 き Continuation of the front page (31) Priority claim number Japanese Patent Application No. 4-36368 (32) Priority date February 24, 1992 (199.2.2.24) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-170496 (32) Priority date June 29, 1992 (1992.6.29) (33) Priority claim country Japan (JP) (72) Inventor Masanobu Sato 2-229 Sakuragaoka, Higashiyamato-shi, Tokyo Casio Computer Co., Ltd., Tokyo office (72) Inventor Kazuyuki Kurosawa 2-229 Sakuragaoka, Higashiyamato-shi, Tokyo Casio Computer Co., Ltd. Tokyo office (56) References JP Sho 59 -5731 (JP, A) JP-A-56-166621 (JP, A) JP-A-59-126314 (JP, A) JP-A-57-69924 (JP, A) JP-A-2-1944781 (JP, A) JP-A-4-77110 (JP, A) JP-A-3-121724 (JP U) (58) investigated the field (Int.Cl. ^7, DB name) H03J 7/18 H03J 5/00 - 5/02 H04B 1/16 H04N 5/44 - 5/50

Claims (2)

(57) [Claims] 1. Automatically control a plurality of channels of a television signal.
Channels received by tuning and sequentially received
A receiver for displaying broadcasts displays broadcasts of channels received sequentially for a predetermined time.
Channel numbers of multiple channels that can be received while
Number and the channel of the currently displayed channel.
Display means is provided to display the panel number so that it can be identified.
A receiver characterized in that: 2. The receiving channel according to the auto-tuning.
Detecting means for detecting the reception intensity for each channel and the reception channel obtained by the above auto tuning
The reception strength of the reception channel obtained by the detection means.
And storage means for storing together to information provided, the reception strength of the reception channels stored in the memory means
Received by changing the time sequentially according to the information indicating the degree, introduction table
The receiver according to claim 1, wherein the receiver indicates: