JPS62183628A - Receiver - Google Patents

Abstract

PURPOSE:To sufficiently enhance the reception inhibiting function by narrowing the width of a frequency shift of a minute adjusting means when the adjacent channel of a reception channel is set to the output inhibition mode at the channel selection so as to inhibit the watching of the broadcast program of the inhibited channel. CONSTITUTION:In a reception inhibiting function to set a prescribed channel as the object of the reception inhibition, an identification signal representing the reception inhibition channel corresponding to the prescribed channel is stored in a nonvolatile memory 50. In depressing a fine tuning key 166, the center frequency of the turning is deviated. In depressing an up-key 161, whether or not the adjacent channel is inhibited for the reception in the direction to increase the frequency is discriminated based on an identification signal stored in the memory 50 and when the reception is inhibited, the deviation DELTAf is narrowed. On the other hand, in depressing a down-key 162, whether or not the adjacent channel is inhibited for the reception in the direction lowering the frequency is discriminated based on the identification signal stored in the memory 50 and when the reception is inhibited, the deviation DELTAf is narrowed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a reception device for satellite broadcasting, etc., which has a reception prohibition function that can prohibit the output of a broadcast signal of a predetermined channel.

[Summary of the invention]

The present invention provides a receiving device that has a function of prohibiting the output of a broadcast signal of a predetermined channel and also has forced fine tuning means (fine tuning function) to avoid interference with terrestrial waves. When setting a target for reception prohibition, an identification signal is stored in memory in a form corresponding to a predetermined channel, and when performing fine tuning during tuning, the adjacent channel of the receiving channel is selected based on the stored identification signal. If it is a prohibited channel, by narrowing the frequency deviation width of the fine adjustment means, it is possible to ensure that the channel whose reception is prohibited is broadcast. This prohibits the output of signals.

[Conventional technology]

2. Description of the Related Art Conventionally, for example, in a television device, a receiving device has been proposed that has a reception prohibition function that can prohibit the output of a broadcast signal of a certain channel for educational or other reasons. As a receiving device having such a function, for example, Japanese Patent Application No. 60-234, which was proposed earlier by the applicant of the present application,
There is a receiving device shown in No. 975.

This receiving device has an index signal input means, an index signal storage means, an index signal comparison means, and a broadcast signal reception means. For example, by making it possible to set or cancel the reception prohibition of a predetermined channel only when inputting , and also to enable the registration of a new index signal, for example, the reception prohibition setting is prevented from being canceled easily. It is something.

Further, the above-mentioned receiving device is equipped with a function (fine tuning function) as a countermeasure against terrestrial interference. This fine tuning function is activated when the broadcast signal of the channel you are trying to receive and the terrestrial wave in the band close to the broadcast signal interfere with each other, making it impossible to receive good reception.It stops the AFT operation. The user himself/herself forcibly shifts the tuning frequency within the range of, for example, :mlOMHz to make fine adjustments, thereby avoiding interference with terrestrial waves and ensuring good reception.

[Problem that the invention seeks to solve]

However, in a receiving device that has a reception prohibition function as well as a fine tuning function, even though a predetermined channel is set to receive reception prohibition, reception of channels adjacent to the prohibited channel is prohibited. There was a problem in that it was possible to view videos of channels whose reception was prohibited by setting the channels that were not in the receiving state and shifting the tuning frequency using the fine tuning function.

Therefore, an object of the present invention is to provide a receiving device that uses a fine tuning function to prevent viewing of video of an adjacent channel when the adjacent channel is a channel whose reception is prohibited. .

[Means for resolving the problem] The present invention provides a receiving device capable of prohibiting the output of a broadcast signal of a predetermined channel, which includes a fine adjustment means for shifting a tuned frequency and a method for identifying a predetermined channel. By referring to the memory in which the identification signal stored in the memory is stored and the identification signal stored in the memory at the time of channel selection, it is determined whether or not the adjacent channel of the receiving channel is set to output prohibition. The receiving device is characterized by comprising means for narrowing the width of the frequency \l deviation of the fine adjustment means when the output of a channel is set to be prohibited.

[Effect]

When setting a predetermined channel as a reception prohibited target using the reception prohibition function, an identification signal indicating that the reception is prohibited channel is stored in the nonvolatile memory 50 in a form corresponding to the predetermined channel. . When the fine tuning function is used during channel selection, it is determined whether or not the channel adjacent to the receiving channel is prohibited from receiving, based on the identification signal stored in the non-volatile memory 50, and the adjacent channel is prohibited from receiving. If so, the width of the frequency shift is narrowed, and the broadcast signal of the channel whose reception is prohibited will not be output.

C Embodiment] Hereinafter, an embodiment of the present invention will be described in the following order with reference to the drawings.

a. Explanation of the broadcast signal, Explanation of reception channel selection C8 Explanation of the audio system d. Explanation of the fine tuning function e. Ku band, 4GH7 band C
1 shows an embodiment in which the present invention is applied to a satellite broadcast receiving device capable of receiving bands.

In FIG. 1, reference numeral 11 indicates a BS antenna as a human power section for transmitting radio waves from a broadcasting satellite.

KU hand from broadcasting satellite 10 (12GHz band, 11
．． 7-12.2 GHz) or C-band (4 GHz
A satellite broadcast signal of 3.7 to 4.2 GHz) is supplied to the S/U converter 12 via the BS antenna 11 .

In this S/l, converter 12, frequency conversion is performed, and both the ku band and C band are 950 to 1450.
M) lz signal 515. That is, S/l' is fixed at 10.75 GHz when the local frequency for frequency conversion in the converter 12 is ku band,
In the case of C band, it is fixed at 2.75 GHz.

Although FIG. 1 shows only one system of BS antenna and S/U converter, in reality, the BS antenna and S/U converter are separate systems for KU band reception and C band reception.
The U converter is switched and used.

As shown in Fig. 2, the satellite broadcast signal SBS has a video signal SV with the highest frequency 'Ej, 4.2 MHz, and a carrier wave located in the upper frequency band of the video signal SV, for example, in the 5.0 to 8.5 MHz band. The signal S is a signal obtained by multiplexing 34 FM audio signals transmitted in the 12G)lz band or the 4Gtlz band, respectively, and is FM-modulated, so the signal S is also an FM signal.

Here, the audio modes of the single language SBS satellite broadcasting include ∎ monaural, ∎ multiplex, ∎ discrete, and ∎ matrix. FM in monaural mode
The audio signal S, □, is a monaural audio signal SA of 5.0~
A single carrier wave in the 8.5 MHz band is F Si modulated, and its frequency deviation is, for example, 75 Kl (z. Also, in the case of multiplex mode, the F M audio signal S
AF A is the sum signal of the left audio signal R and the right audio signal R (L-
=R) and a signal in which the subcarrier is FM modulated using the difference signal (L-R), a single carrier wave in the 5.0 to 8.5 MHz band is FM modulated, and its frequency deviation is , for example, 100 KHz.

Also, in the case of discrete mode, FM audio signal S
AFM is 5.0 for left audio signal R and right audio signal R, respectively.
The first and second carrier waves in the ~8.5 MHz band are FM modulated, and the frequency shift is, for example, 75 KHz. In this case, the interval between the first and second carrier waves is often set to, for example, 0.18 MHz.

Furthermore, the FM audio signal S A in the matrix mode
FM is obtained by FM modulating first and second carrier waves of 5.0 to 8.5 MHz with a sum signal (L-=R) and a difference signal (L-R), respectively, and the frequency deviation is, for example, 100 KHz.
It is said that In this case, the interval between the first and second carrier waves is
For example, it is often set to 1°OOMHz.

It should be noted that the position of the carrier wave of the F~4 audio signal SAr+< in each of the above-mentioned modes is not uniformly determined, and is 5.0~8.
Optional or most frequent in the 5 MHz band are 6.80 MHz for mono and multiplex modes, and 5.80 MHz for discrete modes.
58 MHz, 5.76 MHz, and 5.808) lz, 6.80 MHz in matrix mode.

The number of channels in the KU band and C band is, for example, 24 channels, and as an example, the channel configuration of the C band is shown in FIG. As shown in Part 3, the required bandwidth per channel is 27!1 Hz, and the frequency interval between each channel is approximately 20 MHz. Also,
The polarization plane of the broadcast signal 5Ils of each channel is different in the adjacent channels, ('1, 3, . . .
Horizontally polarized signals are used in the odd channels of (23), and vertically polarized signals are used in the even channels of (2, 4,...24), so that the broadcast signals S0 of adjacent channels are They are designed not to interfere with each other.

Also, in FIG. 1, signals S, L! from the S/U converter 12! is supplied to the signal processing circuit 14 of the tuner 1 via the terminal 13. In this signal processing circuit 14,
For example, the signal S of 950 to 1450 MHz is 402.7
8 MHz intermediate frequency signal; after this conversion, F M
The video signals 3v and F are modulated and shown in FIG.
A composite signal S0 with the M audio signal SAFO is output from the signal processing circuit 14.

In this case, the reception channel is selected by changing the frequency of the local signal S supplied from the PLL circuit 15 for frequency conversion. The control of this PLL circuit 15 is performed by a microcombinator (hereinafter referred to as microcomputer j) 17 based on the user's operation on the operation panel 16.
This is performed by controlling the frequency division ratio of the frequency divider of the PLL circuit 15 according to the channel. Further, the processing circuit 14 outputs a signal S AFT indicating a change in the intermediate frequency.
is supplied to the microcontroller 17, and the intermediate frequency signal is correct.
The AFT operation is performed so that 402.78 Ml(z).

b. Description of selection of reception channels Here, reception channels are selected randomly using the numeric keys "1" to "O" on the operation panel 16, and the up keys 161. The channels are selected sequentially using the down key 162.

First, random channel selection will be explained. The user presses the number corresponding to the desired channel using the numeric keypad Vl2~"02" on the operation panel 16, and finally presses the enter key, -E\T.
When El'l j is pressed, the microcomputer 17 changes the frequency division ratio of the frequency divider of the PLL circuit 15, and therefore the frequency of the local signal S from the PLL circuit 15 is changed, and the desired channel is selected. Ru.

By the way, as mentioned above (corresponding to each channel, the polarization plane of the broadcast signal 5IIs is determined to be horizontal or vertical. Therefore, when changing the receiving channel, it is necessary to match the receiving polarization plane to that receiving channel. The key 163 on the operation panel 16 is for switching the receiving polarization plane.
A switching signal S, which is output to the terminal 19 via the switch signal S, controls the S/U converter 12 to change the reception plane of polarization. The state of
This key 163 is operated to sequentially change the receiving polarization plane, thereby switching the receiving polarization plane.

Next, sequential channel selection will be explained. When the user presses the amplifier key 161 or down key 162 on the operation panel 16, the microcomputer 17 sequentially changes the frequency division ratio of the frequency divider of the PLL circuit 15, so that the frequency of the local signal SL from the PLL circuit 15 changes. The receiving channels are sequentially switched and selected. In this case, when the up key 161 is pressed, l→3→...→23
→2→4→...→24→1→3... When the down key 162 is pressed, the receiving channel is selected as follows: 23→21→...-1→24→22→・・・
・→2→23-21→... The channels are selected as follows. That is, odd-numbered channels and even-numbered channels are alternately selected.

Also, as mentioned above, for example, the plane of polarization for odd channels is horizontal and the plane of polarization for even channels is vertical, so the receiving polarization plane is switched when moving from an even channel to an odd channel or from an odd channel to an even channel. . That is, at this time, the state of the switching signal SFO from the microcomputer 17 is changed and the reception polarization plane is switched.

The flowchart in FIG. 4 shows the operation during this sequential channel selection. That is, when the up key 161 is pressed (■), the number of channels CH is incremented by 2 (■). next,
It is determined whether the number of channels CH is 25 or more.

When the number of channels is not 25 or more, the channel corresponding to the number of channels is selected. On the other hand, if the number is 25 or more, it is determined whether the number is even or odd. When the number is odd, the number of channels CH is set to 2; when the number is even, the number of channels is set to C.
)1 is considered to be 1■. Then, the receiving plane of polarization is inverted (2), and channels of the number of channels CH are selected (2). The above operations are repeated while the up key 161 is pressed, and the receiving channel when the button is stopped is finally selected.

Also, when the down key 162 is pressed (■), the number of channels CH is subtracted by 2 n [phase]. Next, the number of channels CH
It is determined whether or not is less than or equal to 0. If it is not less than 0, the channel with that number of channels is selected.■
. On the other hand, when it is less than 0, it is determined whether it is an even number or an odd number. When D is an odd number, the number of channels CH is set to 24; and when it is an even number, the number of channels CH is set to 23. Then, the receiving plane of polarization is inverted (2), and channels of the number of channels CH are selected (2). While the down key 162 is pressed, the above operations are repeated, and the receiving channel when the down key 162 is stopped is finally selected.

Incidentally, at this time of channel selection, the number of selected receiving channels is displayed on the display section 201 of the display panel 20.

In the example of FIG. 1, it is shown that six channels are selected. Further, when the reception polarization plane is switched horizontally or vertically, the display section 20 of the display panel 20
2 or 203 is displayed lit. Here, the display section 204 of the display panel 20 is lit and displayed when broadcasting is received.

Further, the display unit 205 lights up when receiving the KU band or the C band, for example, when receiving the C hand.

In addition, the composite output S0 output from the signal processing circuit 14
(see FIG. 2) is supplied to a de-emphasis circuit 21, and the signal pre-emphasized on the transmitting side is restored to its original state. The output of this de-emphasis circuit 21 is supplied to a low-pass filter 22 to extract a video signal SV, which is amplified by an amplifier 23 and then supplied to an energy spread signal removal circuit 24. In this removal circuit 24, the triangular wave energy diffusion signal superimposed on the video signal S■ on the transmitting side is removed, and the video signal Sv from this removal circuit 24 is outputted to the output terminal 26 via the muting circuit 25. be done. The muting circuit 25 has an intermediate frequency of 402.78 MHz in the signal processing circuit 14.
It is controlled by a control signal SHv formed based on the presence or absence of a carrier wave of 402.78 MHz, and the muting state is set when there is no carrier wave of intermediate frequency 402.78 MHz.

Description of the C9 audio system Further, the synthesized output So output from the signal processing circuit 14 is supplied to the band pass filter 30, and is 5.0 to 8.5
An FM audio signal SAFM whose carrier wave is located in the MHz band is extracted. This FM audio signal S AFN is then supplied to PLL circuits 31 and 32 that include a mixer and constitute a frequency converter. These PLL circuits 31 and 32 are for converting the carrier wave of the FM audio signal SAFH to 10.7 MHz. In this case, as mentioned above, when the audio mode is monaural mode or multiplex mode, a single carrier wave in the 5.0 to 3.5 MHz band is used, so for example, a conversion output is obtained from the PLL circuit 31. Ru. On the other hand, when in discrete mode or matrix mode, 5.0 to 8.
Since the first and second carrier waves in the 5 MHz band are used, conversion outputs can be obtained from both PLL circuits 31 and 32.

Here, as described above, the FM audio signal 5AF of each mode
The position of the I4 carrier wave is not uniformly determined;
．． It is arbitrary in the 0 to 8.5 MHz band. Therefore, the desired F
In order to receive the FM audio signal SAF14, the carrier wave of the FM audio signal SAF14 is set to 10.7 MHz.
The user's operation panel 1
6, the microcomputer 17 sends frequency division ratio control signals SNr and SN to the PLL circuits 31 and 32, respectively.
, and the frequency division ratios of the frequency dividers of the PLL circuits 31 and 32 are controlled to perform so-called tuning.

A key 164 on the operation panel 16 is a key for selecting an audio mode. By pressing this key 164 in sequence, the audio mode changes from monaural to multiplex to discrete to
The selection is made in the following order: matrix → monaural. In this case, when switching to the monaural mode and the multiplex mode, the tuning frequency f in the PLL circuit 31 is automatically tuned to, for example, 6.80 MHz. Further, when switching to the discrete mode, the tuning frequencies f1 and f2 of the PLL circuits 31 and 32 are, for example, 5.58 MFlz and 5.76 Mflz, respectively.
Hz. Furthermore,
When switching to the matrix mode, the tuning frequencies f and r2 of the PLL circuits 31 and 32 are, for example, 5.80.
MHz and 6.80 MHz.

The tuning frequency is assumed to be constant when switching between each mode, but FM
When the position of the carrier wave of the audio signal SAF:4 is not at this tuning frequency, the user operates keys on the operation panel 16 to perform tuning.

Here, the tuning is performed after pressing the voice tuning key 165 on the operation panel 16, and then numeric key rl=~-0.
, ; or Anobukie 61. This is done using the down key 162.

In FIG. 1, an audio signal SAI with a carrier wave of 10.7 MHz obtained from a PLL circuit 31 is passed through a narrowband bandpass filter 33 and a wideband bandpass filter 34 to identification terminals on the A side and B side of a changeover switch 35, respectively. is supplied to Furthermore, the audio signal SAt with a carrier wave of 10.7 MHz obtained from the PLL circuit 32 is supplied to fixed terminals on the A side and B side of the changeover switch 38 via a narrowband pend-pass filter 36 and a wideband bandpass filter 37, respectively. Ru. When the audio mode is monaural mode or discrete mode, ``Since the frequency shift is relatively narrow, for example, 75 KHz, the switch notches 35 and 38 are switched to the A side, and narrow band pass signals are output from the changeover switches 35 and 38. Audio signals SAI and SAW that have passed through filters 33 and 36 are obtained. On the other hand, if the audio mode is multiplex mode or matrix mode,
Since the frequency shift is relatively wide, for example, 100 KHz, the changeover switches 35 and 38 provide the audio signals SAI and Sat that have passed through the broadband bandpass filters 34 and 37.

Switching of the changeover switches 35 and 38 is performed as follows. That is, the microcomputer 17 outputs a 2-bit signal CA in response to the selection of the audio mode.

B] is generated. In other words, C1, l] in monaural mode and (0, l) in multiplex mode.
03, C1,0] in the discrete mode, and C0II:i in the matrix mode.

Signal A is 11' in monaural mode and discrete mode, and 0' in multiplex mode and matrix mode, and this signal A is supplied to switching switches 35 and 38 as a switching signal. And signal A
When is "1", it is switched to the A side, and when it is 0, it is switched to the B side.

Audio signal S taken out from changeover switches 35 and 38
0 and S+t are supplied to FM repeaters 39 and 40, respectively. The demodulated outputs from these FMul modulators 39 and 40 are supplied to an audio processing circuit 41.

The audio processing circuit 41 performs processing according to each audio mode. That is, the 2-bit signal CA from the microcomputer 17,
B) is supplied to a decoder 42, which decodes 4
Bit signals [a, b, c.

d] and supplied to the audio processing circuit 41 as a control signal. For example, in monaural mode; 1.13
is C1, 0, O, o], [o, o] in multiplex mode is (0, 1° 0, O], and [1° 0] in discrete mode is Co, 0, 1 .0]
In matrix mode, ro, 1] is [o
, o, O, IF. As a result, the audio processing circuit 41 is controlled, and processing corresponding to each audio mode is performed.

In the case of monaural mode, monaural audio signals are extracted from the first and second outputs of the processing circuit 41, and are output from the amplifiers 43 and 44 and the muting circuits 45 and 4, respectively.
6 to output terminals 47 and 48. Also,
In the case of multiplex mode, discrete mode, and matrix mode, a left audio signal R and a right audio signal R are taken out from the first and second outputs of the processing circuit 41, respectively, and are sent to amplifiers 43 and 44, respectively. Muting circuit 45
and 46 to output terminals 47 and 48.

Further, the F MyL tone circuits 39 and 40 output signals Sl and 3M2, which have a low level "01" when the audio signals SAI and SA2 are present, and a high level "1" when they do not, and are supplied to the AND circuit 49, respectively. .and,
When the output of the AND circuit 49 is at a high level "1", that is, there is no audio signal SAI or SAt, the muting circuit 45
and 46 are put into operation.

In addition, signals Sl and S from the FM demodulation circuits 39 and 40
1 and 2 are supplied to the microcomputer 17 and used for the sweep speed side j1'J when tuning the audio signal using the up key 161 or the down key 162 as described above.

d. Description of Fine Tuning Function Furthermore, the key 166 on the operation panel 16 is a key for fine tuning. That is, the broadcast signal C from the broadcast satellite
This is to prevent beat disturbance due to interference between terrestrial communication signals (SHF waves) and terrestrial communication signals (SHF waves), and it slightly shifts the tuning center frequency for selecting the receiving channel in the signal processing circuit 14. When the fine tuning key 166 is pressed, a display as shown in FIG. 5A is displayed on the display section 201 of the display panel 20. In FIG. 5A, "roo, o" indicates that the center frequency of tuning is not shifted. Next, the up key 161 or the down key 16
If 2 is pressed, the tuning center frequency will be set to 0, for example.
．． Shifted in 2 MHz steps. In other words, in Fig. 6, if fl is the terrestrial interference frequency and ``, is the congruent wave number in the original tuning, then the center l wave number is biased by Δf in steps of 0.2?Itlz, such as f. The shifted frequency is displayed on the display unit 201 as shown in FIG. 5B.This frequency shift amount Δr
is the extent to which the influence of terrestrial waves becomes less noticeable on the screen,
For example = IOM! 1z, and the frequency is set to such an extent that the video output of the adjacent channel whose reception is prohibited is not generated when the polarization plane is switched, for example, about 5 MHz.

Further, at this time, the AFT operation is prohibited to prevent the shifted frequency from returning to its original state. When the receiving channel is switched, this prohibition of AFT operation is canceled. Furthermore, AFT
Operation begins at power-on.

The flowchart in FIG. 7 shows the operation related to the above fine tuning. That is, the AFT operation is started when the power is turned on. When the fine tuning key 166 is pressed (2), the tuning center frequency can be shifted (2).

When the up key 161 is pressed, it is determined based on an identification signal stored in the non-volatile memory 50 when setting a channel for which reception is prohibited, which will be described later. ■Be judged. If the adjacent channel is not prohibited from reception, it is determined whether the deviation amount Δf is +10 MHz. If it is not medium IQ MHk, the center frequency f0 of tuning is set to fo = 0.2MHz, and +l
If it is OMHz, the tuning center frequency f0 is tuned as is. In addition, if the adjacent channel is prohibited from receiving, the deviation amount Δ
It is determined whether "is -5MHz■.-5M) IZ
If not, the tuning center frequency f0 is f
O=, 0.2M)lz, and if it is 5MHz, the tuning center frequency f0 is tuned as is.

After tuning is performed at f, the AFT operation is prohibited [phase] and the state is returned to the key sense state. up key 1
The above operations are repeated while 61 is pressed.

In other words, the maximum possible value of the deviation amount Δf is changed depending on whether reception is prohibited on adjacent channels in the direction of increasing the frequency. The maximum value of the quantity Δf is -
1-5MHz, within the narrowed range 0.2
M) The center frequency f0 is forcibly shifted in the IZ step.

On the other hand, when the down key 162 is pressed (■), an identification signal stored in the non-volatile memory 50 is used to determine whether reception of adjacent channels is prohibited in the direction of lowering the frequency when setting reception prohibited channels, which will be described later. Will be judged based on @. If the adjacent channel is prohibited from receiving, it is determined whether the deviation amount Δf is -10Mtlz.If it is not 0°-10MHz, the tuning center frequency f0 is f o -0,2Mtlz. If [phase] is IO1'I)Iz, the tuning center frequency f0 is tuned as is. Further, if reception of an adjacent channel is prohibited, it is determined whether the deviation amount Δf is 15 MHz [phase]. If it is not -5MHz, the tuning center frequency f0 is set to fo 0.2MHz, and -5M
If it is Hz, the tuning center frequency f0 is tuned as is.

After tuning is performed with fo, the AFT operation is prohibited and the key sense state is returned to 0. The above operations are repeated while the down key 162 is pressed.

In other words, the minimum possible value of the deviation Δf is changed depending on whether reception is prohibited on adjacent channels in the direction of lowering the frequency. The minimum value of Δf is set to 15MHz, and within the narrowed range, 0.2M
Force the center frequency f in Hz steps. be shifted.

For example, it is assumed that the total number of channels is 24 and reception prohibited channels are set for each channel as shown in the table below.

In the table, if the channel whose identification signal is, for example, "1" is a channel whose reception is prohibited, (2, 6,
10, 14, 16, 22>The deviation width of the channel is narrowed in the direction of lowering the frequency during fine tuning. Further, the deviation width of the (3, 8, 12, 14° 20) channel is narrowed in the direction of increasing the frequency during fine tuning. In addition, (7, 11, 12, 17, 18, 1
9, 23, 24) For channels, the deviation width is not changed.

Further, when there is a key-in using the numeric keypad "l j-" or Q 4, the prohibition of AF operation is canceled, and then tuning is performed and the receiving channel of the keyed-in number is selected.

e. Description of reception prohibition function The key 167 on the operation panel 16 is a key for setting and canceling reception prohibition (parental lock).

With the specified channel selected, press Operation Panel 1.
When the No. 6 key 167 is pressed, a message is displayed on the display unit 201 indicating that reception prohibition can be set.

Next, when the 3-digit index signal ID is input using the numeric keypad 71'' to rO'' and the enter key rFsNTER'' is pressed, the input index signal ID and the predetermined channel pre-stored in the non-volatile memory 50 are input. The corresponding index signal [Do] is compared. If the index signals match, a display is displayed on the display unit 201 indicating that the predetermined channel selected at that time is set to be prohibited from receiving, and a message corresponding to the predetermined channel is displayed in the nonvolatile memory 50. An identification signal, for example rlj, is stored in a manner such that reception is prohibited.

In this case, in order to prohibit reception, the frequency division ratio of the PLL circuit 15 is changed to change the frequency of the local signal S, and the center frequency of tuning is set to 950 to 145. OM
The frequency is set to be outside the Hz band, for example, 1480 MHz. Therefore, when the reception is prohibited, there is no carrier wave of 402.78 MHz in the signal processing circuit 14, and the muting circuit 25 operates to enter the video muting state.

Also, at this time, the signal S from the FM demodulation circuits 39 and 40
Since both MI and SH2 become high level "1", muting circuits 45 and 46 operate to enter the audio miniting state.

On the other hand, if the index signal TD does not match the ID, the original display is returned and the selected predetermined channel is not prohibited from receiving.

Furthermore, if a predetermined channel is selected and the key 167 on the operation panel 16 is pressed while this channel is in a reception prohibited state, the display unit 201 will show a message indicating that the reception prohibition can be canceled. A display will be displayed. Next, when a 3-digit index signal ID is input using the numeric keypad r1; %jOj and the enter key 7 ENTERj is pressed, the input index signal ID and the predetermined channel pre-stored in the non-volatile memory 50 are A corresponding index signal IDo is compared. When the index signals match, a display is displayed on the display unit 201 indicating that the predetermined channel whose reception is prohibited at that time has been excluded from the reception prohibition target, and at the same time, the predetermined channel is stored in the nonvolatile memory 50. An identification signal, for example 70-, is stored in a format corresponding to , and the reception inhibited state is released.

In this case, when the reception inhibited state is released, the center frequency of tuning is returned to the correct position, and therefore the operation of the muting circuits 25, 45 and 46 is also stopped, and the muting state is released.

On the other hand, if the index signal ID does not match IDo, the display returns to the original display, and the reception-prohibited predetermined channel is not released from the reception-prohibited state.

Further, when changing the index signal ID corresponding to a predetermined channel stored in the nonvolatile memory 50, the following procedure is performed. That is, when the key 167 of the operation panel 16 is pressed while a predetermined channel is selected, a display is displayed on the display section 201 indicating that the index signal +D can be changed. Next, a 3-digit index signal IDI is entered manually using the numeric keypad 71" to "0", and then a 3-digit index signal ID2 is entered and the enter key rENTERj is pressed. sexual memory 5
0 and an index signal IDo corresponding to a predetermined channel stored in advance. When the index signal fails, the index signal ID2 input later is written in the nonvolatile memory 50 as the index signal IDo.

On the other hand, if the index signals iDI and IDo do not match, the index signal TD stored in the nonvolatile memory 50 cannot be changed and is left as is, and the display section 201 shows, for example, "Mimimi" is displayed.

Incidentally, the non-volatile memory 50 stores an index signal ID common to each cent corresponding to each channel at the time of shipment from the factory.
is memorized.

Also, the index signal T stored in the memory 50
I) If you forget e, a factory code, ie, a master key-like index signal, for example -9995, is prepared, and this is used in the worst case.

The flowchart in FIG. 8 shows the above operation. That is, when the key 167 on the operation panel 16 is pressed while a predetermined reception channel is selected, the display section 20
For example, "VP" is displayed in "1", and reception is set or canceled, or the index signal IDO is registered. Next, an index signal is input using the numeric keypad "12-:0" (■), and when the enter key "ENTER" is pressed (■), it is determined whether there are 3 digits or not. In the case of 3 digits, one index signal [D] has been input using the numeric keypad -12 to -02.Next, this input index signal ID is used as the index stored in advance in the non-volatile memory 50. It is determined whether or not it matches the signal IDo. If they do not match, the display unit 201
■ When the display returns to its original state, the key sense state is established. If they match, it will be determined whether or not reception is prohibited■
. If it is not in the reception prohibited state, it is determined that the operation is to set the reception prohibited state, and the reception is prohibited. and,
The center frequency of tuning is set to be outside the band [phase], and the display section 201 displays, for example, "PL", indicating the key sense state.Also, if reception is prohibited,
It is determined that the operation is for canceling, and the reception prohibition status is canceled @. Then, the tuning center frequency is returned to the original position so that a predetermined channel can be received, rPLj on the display section 201 is turned off, and the key sense state is returned.

In addition, when determining whether or not there are 3 digits, if it is not 3 digits, then a judgment is made as to whether it is 6 digits or not, and if it is not 6 digits, the original display is returned. , is considered to be a key sense state. In the case of 6 digits, this means that the index signals IDI and ID2 were input consecutively using the numeric keypad "11 to 70", so the next input index signal IDI is stored in the non-volatile memory 50 in advance. Index signal I
It is determined whether Oo-s'l matches Do. If not, it is determined whether or not it is a factory code [phase].

If it is not a factory code, for example,
2 is displayed and @, the key sense state is set. On the other hand, index signals ID1 and ID. If it matches,
Alternatively, if the index signal IDI is a factory code, the input index signal ID2 is stored in the memory 50 as the index signal D0 [phase]
. Then, this index signal ID2 is displayed on the display section 201.
■ is displayed, indicating the key sense state.

Note that the key 168 on the operation panel 16 is connected to the output terminal 26.4.
This is a key for using the signal output at 7.48 as an external input signal. In order to simplify the drawing, external input terminals, switching switches, etc. are not shown in FIG. Furthermore, for example, when switching to the external input side, the display section 211 of the display panel 20 is lit up.

In one embodiment of the present invention, the polarization plane of odd-numbered channels is horizontal and the polarization plane of even-numbered channels is vertical. The same thing applies to waves. Also, in order to prohibit reception, it is necessary to
However, it may be set to a value that does not allow reception between stations even within the band. Further, a case will be described in which the deviation amount is set to 5 MHz when reception of the adjacent channel is prohibited, but other deviation amounts may be used to the extent that the broadcast signal of the adjacent channel is not output.

〔Effect of the invention〕

According to the present invention, when a predetermined channel is set as a reception-prohibited target using the reception prohibition function, an identification signal indicating that the reception is prohibited channel is stored in the memory in a form corresponding to the predetermined channel. When the fine tuning function is used when selecting a channel, it is determined whether the channel adjacent to the receiving channel is subject to reception prohibition based on the identification signal stored in the memory.
If reception of adjacent channels is prohibited, the width of the frequency shift is narrowed.

Therefore, according to the present invention, the reception prohibition setting is not easily canceled, and when the adjacent channel is prohibited from reception during fine tuning, the width of the frequency deviation is By making the width narrower, the broadcast signal of the prohibited channel will not be output, and the broadcast number of the prohibited channel will certainly not be seen, and the reception prohibition function can be fully utilized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of this invention, FIGS. 2 and 3 are route maps used to explain an embodiment of this invention, and FIG. 4 is a diagram showing sequential channel selection in an embodiment of this invention. The flowchart used to explain the operation, FIGS. 5 and 6 are used to explain the fine tuning in one embodiment of this invention. The route diagram and FIG. 7 are used to explain the fine tuning function in one embodiment of this invention. flowchart,
FIG. 8 is a flowchart used to explain the reception prohibition function in one embodiment of the present invention. Explanation of main symbols in the drawings 1: tuner, 16: operation panel, 17: microcomputer, 50: nonvolatile memory. Agent Patent Attorney Tadashi Sugiura Tomoichi 20M"1" Takashi Nabe Tamaki C-band δIte 5,000yen γ"JfkA ≧ Figure 3 F01 Figure 4

Claims (1)

[Scope of Claims] A receiving device capable of prohibiting the output of a broadcast signal of a predetermined channel, comprising: fine adjustment means for shifting a tuning frequency; and a memory for storing an identification signal for identifying the predetermined channel. , At the time of channel selection, by referring to the identification signal stored in the memory, it is determined whether the channel adjacent to the receiving channel is set to be output prohibited, and the channel adjacent to the receiving channel is set to be prohibited from outputting. and means for narrowing the width of the frequency shift of the fine adjustment means when the fine adjustment means has a frequency deviation width of the fine adjustment means.