JPH07184140A - Channel selection device - Google Patents

Abstract

PURPOSE:To freely preset a master screen channel and a slave screen channel in the case of operation of dual-screen function. CONSTITUTION:When a master slave screen function is operated, a master screen tuner 2 and a slave screen tuner 12 receive a signal and apply frequency conversion to the signal respectively and use a channel selection circuit 7 based on an AFT signal from video intermediate frequency circuits 3, 13 to control the tuners 2, 12 to be tuned to a regular television channel. Then channel number data desired by the user for the master screen and the slave screen is set respectively to at least two memory areas 9a, 9b provided to a memory circuit 9 connecting to the channel selection circuit 7. Then the master screen or the slave screen desired by the user is preset separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color television receiver, and more particularly to a television receiver capable of displaying a parent-child screen by digitizing a video signal and performing signal processing, for example, a channel for a parent screen or The present invention relates to a channel selection device capable of presetting each sub-screen channel as a channel desired by a user.

[0002]

2. Description of the Related Art In recent years, pulse modulation (Pulse Code Module) has been performed along with the multi-functionalization of television receivers.
(hereinafter, abbreviated as PCM) and has a function of receiving satellite broadcasting and a function of converting a video signal which is an analog signal into a digital signal and performing a video signal processing to display a parent-child screen. The number of color television receivers has been increasing.

On the other hand, along with the digitization of video technology, as is well known, a digital television receiver for performing video signal processing using digital signals has been adopted. This digital television receiver has improved image quality by digitizing a video processing circuit. Therefore, it is possible to apply a memory to display parent-child screens, multi-screens, still images, and other screens. It is possible.

By the way, among such various functions, a parent-child screen function (called picture-in-picture,
Hereinafter, abbreviated as PIP function) is an on / off function, a channel up / down function according to a user's request, an input source switching function that can be switched according to an input source, a parent-child screen replacement function, and further adjusts the position of the child screen Various functions such as a position movement function that can be used are adopted.

Generally, in the color television receiver having the PIP function, the conventional VHF / UH
In addition to the tuner capable of receiving the F band, a sub-screen tuner for receiving the sub-screen channel associated with the PIP function is provided. For this sub-screen, the VHF / U is also used as described above.
There is a so-called double tuner PIP capable of receiving the HF band.

A PIP having such two tuners
The TV receiver having the function receives the high frequency signals of the main screen and the sub screen in each tuner using the tuning circuit,
In order to insert the received small screen into the main screen, the video signal of the small screen is compressed and reproduced in synchronization with the main screen.

On the other hand, in a color television receiver having a PIP function for North America, since there are many channels that can be received, there is a channel program function as a means for memorizing an available signal.

This channel program function receives, for example, a channel as a parent screen using a tuner and a tuning circuit, that is, stores a signal channel of the parent screen in a memory means using a microcomputer. At this time, a channel desired by the user can be arbitrarily set using an input circuit (keyboard), and can be stored as a memory channel. In other words, by executing from the stored channels, the channels desired by the user can be easily selected in sequence from a large number of channels, and the selected channels can be displayed on the screen. I am trying.

Further, when activating the PIP function,
From the channels arbitrarily stored in the memory means as the parent screen, for example, a channel for the child screen is selected, and a channel selection device is used to select a channel based on the data of the selected channel. Display the selected channel for the sub screen. In other words, it is used for selecting a sub-screen channel from any parent screen channel stored in the memory means, that is, in a conventional color television receiver having a PIP function, The channel that can be received on the screen is shared with the memory channel of the parent screen.

A block diagram of a color television receiver having such a PIP function is shown in FIG.

FIG. 2 is a block diagram showing an example of a color television receiver having a PIP function. In particular, memory means connected to a channel selection circuit is provided, and a channel number as a main screen is preset in this memory means. It is characterized by doing so.

As shown in FIG. 2, a signal received by the antenna 1 is converted into an intermediate frequency signal by the tuner circuit 1 for the main screen and the tuner circuit 12 for the sub screen of the color television receiver, respectively. Video signals are taken out by the video intermediate frequency circuits 3 and 13 configured with a video detection circuit, and the luminance signal Y and the color difference signal (R-
Y, B-Y). Further, the video intermediate frequency circuits 3 and 13 also separate the sync signal.

The video signal of the main screen demodulated by the main screen video intermediate frequency amplifier circuit 3 is supplied to the video amplifier circuit 10, which amplifies the input video signal and supplies it to the synthesis output circuit 11. The audio signal extracted by the video intermediate frequency circuit 3 is amplified by the audio amplifier circuit 4 and output through the speaker 5.

On the other hand, on the sub-screen side, the video signal demodulated by the video intermediate frequency circuit 13 is digitized (not shown), then compressed by the compression means and written in a memory (not shown). Then, it is read based on a timing signal generated from the sync signal of the parent screen and the child screen, and the read compressed signal for the child screen is image-processed by the image amplification circuit 14 for the child screen, and the composite output is obtained. This combined output circuit 1 is supplied to the circuit 11 and
The image signal of the parent screen and the image signal for the child screen are combined by 1 and displayed on the cathode ray tube 15 (hereinafter abbreviated as CRT).

By the way, when receiving the channel of the parent screen or the child screen, it is well known that the intermediate frequency signal from the tuner 2 for the parent screen or the tuner 13 for the child screen is output as a regular frequency. , AFT (Automatic Fain T)
A) from this AFT circuit is provided.
By supplying the FT signal to the tuning circuit 7, the local oscillation frequency applied to the tuner 2 for the main screen or the tuner 12 for the sub screen is varied to select a regular channel. Further, the tuning circuit 7 has a microcomputer 8 for adjusting a deflecting means (not shown) in accordance with the synchronizing signals from the parent screen intermediate frequency circuit and the child screen image intermediate frequency circuits 3 and 13, for example. The microcomputer 8 is used for control.

Further, the channel selection device 7 is connected with a memory circuit 9 as a memory means which is a feature of the present embodiment. For example, in the color television receiver for North America as described above, there are many A channel number desired by the user is arbitrarily set from the number of channels and is temporarily stored in the memory circuit 9. That is, a desired channel number can be preset. In this preset operation, a desired channel signal is input using an input circuit 6 (made up of a keyboard) connected to the channel selection circuit 7, and a channel based on the input channel signal is input to a microcomputer. Data is stored in the memory circuit under the control of 7.

The memory circuit 9 as the memory means is
A channel number area 9a for storing a signal channel number at the time of presetting is provided, and when, for example, the PIP function is operated, the channel number area 9a of the memory circuit 9 is stored (preset). The child screen channels are sequentially selected and selected from the channel numbers as the parent screen channels (which have been selected).

However, in the color television receiver having the channel selection device having such a configuration, when the PIP function is operated as described above, the memory channel of the parent screen stored in the memory circuit and the child screen are stored. Since it is the same as the memory channel of, the memory channel as the sub-screen cannot be set to the channel number desired by the user, that is, the channel for the sub-screen cannot be preset, which causes inconvenience to the user. I need it.

[0019]

As described above, in the conventional channel selecting apparatus, when the two-screen function such as picture-in-picture is operated, the channel of the parent screen in the memory circuit is the channel desired by the user. If you want to store a number and perform presetting to select a sub-screen channel, recall the memory channel data from the main screen memory channels stored in the memory circuit and select it with the sub-screen tuner. Was. That is, the memory channel of the child screen is the same as the memory channel of the parent screen, so that the user cannot freely preset the channel as the child screen,
There is a problem that it is inconvenient.

Therefore, the present invention has been made in view of the above problems. Therefore, even when a two-screen function such as picture-in-picture is operated, the preset setting of the sub-screen channel is not limited and the main screen is not limited. It is an object of the present invention to provide a channel selection device that allows a user to freely set presets for channels and sub-screen channels and to satisfy the preset operation for the user.

[0021]

According to a first aspect of the present invention, there is provided a channel selecting apparatus which comprises a tuner for frequency-converting a television high frequency signal received by an antenna and an intermediate frequency signal from the tuner. A video intermediate frequency circuit that performs detection and extracts and outputs a composite video signal, which includes at least an AFT circuit.
A T circuit is used to detect the deviation of the local oscillation frequency of the tuner, and an AFT voltage is generated based on a video intermediate frequency circuit that outputs this AFT signal and the AFT signal from the video intermediate frequency circuit. AFT
A tuning circuit that controls a local oscillation frequency of the tuner by using a voltage to select a specific television channel, and a tuning circuit that is provided to select a desired television channel. Input means for supplying desired channel data to the tuning circuit by using a key, and a television channel connected to the tuning circuit and based on the channel data supplied from the input means. A memory circuit having at least two or more memory areas for storing numbers, and a predetermined channel number from the memory area having at least two or more of the memory circuits are read, and the tuning circuit is based on the read channel numbers. And a control means for controlling to execute.

According to a second aspect of the present invention, there is provided a channel selection device according to the first aspect of the present invention, which is provided with at least two main screens and sub-screens for frequency-converting a television high frequency signal received by an antenna. A video intermediate frequency circuit for amplifying and detecting the intermediate frequency signals from the second tuner and the first and second tuners respectively, and extracting and outputting a composite video signal, which is at least an AFT.
And a circuit for detecting the deviation of the local oscillation frequency of the tuner by using the AFT circuit.
The AFT voltage is generated based on the AFT signal from the first and second video intermediate frequency circuits that output signals and the first or second video intermediate frequency circuit, and the AFT voltage is generated.
A tuning circuit that controls a local oscillation frequency of the tuner by using a voltage to select a specific television channel, and a tuning circuit that is used to select a desired television channel Input means for supplying desired channel data to the tuning circuit by using a key, and a television channel connected to the tuning circuit and based on the channel data supplied from the input means. A memory circuit having at least two memory areas for storing numbers, one of the memory areas storing a channel number as a parent screen and the other memory area storing a channel number of a child screen; Read out the predetermined channel number from the memory area which has at least two circuits, and Based on the channel number issued seen,
And a control means for controlling the tuning circuit to be executed.

[0023]

According to the present invention, the television channel of a signal which is received from the antenna is normally tuned by the tuner using the intermediate frequency circuit and the tuning circuit, and the tuned television channel of the signal is stored in the memory circuit. To do. At this time, a desired TV channel number is input using the input circuit, and the channel selection circuit selects the desired channel number based on the input TV channel number. The data is stored in either one of the two memory areas provided in the memory circuit. In this way, desired television channel numbers can be set in sequence. Further, the other memory area can be set in the same manner as described above, that is, it can be freely set so that a channel number group different from that of the memory area can be stored.

Further, when the picture-in-picture function is operated, the two memory areas of the memory circuit are allocated and used for the parent screen and the child screen, so that arbitrary channel numbers can be freely set. Can be set.

[0025]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

The constituent elements having the same elements as those shown in FIG. 2 are designated by the same reference numerals. In the color television receiver including the channel selection device according to the present embodiment, for example, even when used in an area where the number of receivable channels is large, signal channels can be preset in the memory circuit 9 as desired. A color television receiver having a channel program function and a picture-in-picture function (PIP function) capable of displaying two screens (parent-child screen display), the memory being used in the channel program function. By providing the circuit 9 with separate memory areas 9a and 9b for storing the memory channel of the parent screen and the memory channel of the child screen, respectively, it is possible to freely preset the channel desired by the user on the parent screen or the child screen. It has a feature.

As shown in FIG. 1, a signal received by an antenna 1 is converted into an intermediate frequency signal by a tuner circuit 1 for a main screen and a tuner circuit 12 for a child screen of a color television receiver, respectively. Video signals are taken out by the video intermediate frequency circuits 3 and 13 configured with a video detection circuit, and the luminance signal Y and the color difference signal (R-
Y, B-Y). Further, the video intermediate frequency circuits 3 and 13 also separate the sync signal.

The video signal of the parent screen demodulated by the parent screen video intermediate frequency amplifier circuit 3 is supplied to the video amplifier circuit 10, which amplifies the input video signal and supplies it to the synthesis output circuit 11. The audio signal extracted by the video intermediate frequency circuit 3 is amplified by the audio amplifier circuit 4 and output through the speaker 5.

On the other hand, on the sub-screen side, the video signal demodulated by the video intermediate frequency circuit 13 is digitized, though not shown, and then compressed by compression means and written in a memory (not shown). Then, it is read based on a timing signal generated from the sync signal of the parent screen and the child screen, and the read compressed signal for the child screen is image-processed by the image amplification circuit 14 for the child screen, and the composite output is obtained. This combined output circuit 1 is supplied to the circuit 11 and
By 1, the video signal of the main screen and the video signal for the sub screen are combined and displayed on the CRT 15.

By the way, when the channel of the parent screen or the child screen is received, the intermediate frequency signal from the tuner 2 for the parent screen or the tuner 13 for the child screen is normal as in the conventional apparatus shown in FIG. An AFT circuit (not shown) is provided to output the frequency of the AFT signal from the AFT circuit.
Is supplied to the main screen tuner 2 or the sub screen tuner 12 so that the local oscillation frequency is changed to select a regular channel. Further, the tuning circuit 7 has a microcomputer 8 for adjusting a deflecting means (not shown) in accordance with the synchronizing signals from the parent screen intermediate frequency circuit and the child screen image intermediate frequency circuits 3 and 13, for example. This microcomputer 8
It is controlled by using.

A memory circuit 9 as a memory means, which is a feature of this embodiment, is connected to the channel selection device 7.
For example, like a color television receiver for North America,
A channel number of a signal having a signal desired by a user is arbitrarily set from a large number of channels, that is, a desired channel number in a normal single screen display can be preset by using the memory circuit 9. There is. In this preset operation, a desired channel signal is input using an input circuit 6 (made up of a keyboard) connected to the channel selection circuit 7, and a channel based on the input channel signal is input to a microcomputer. Data is stored in the memory circuit under the control of 7. Also in the present embodiment, the input circuit causes the main screen and the sub screen to be displayed when the PIP function is activated or the channel up / down function that is sequentially switched from the preset channel number group is executed. These functions can be operated in order to operate a parent-child replacement function for switching or a position moving function capable of moving the position of the child screen.

The memory circuit 9 as the memory means is
At the time of presetting, for example, when a PIP function is operated, a parent channel number memory area 9a (hereinafter, abbreviated as parent channel memory area) for storing a signal channel number, that is, a channel number as a parent screen, and a child screen At least two channel memory areas, that is, a child channel number memory area (hereinafter, abbreviated as child channel memory area) for storing a channel signal are provided.

The operation of the channel selecting device having such a configuration will be described. It should be noted that only the main part of the channel selection device will be described, and description of other different operations will be omitted.

First, the color television receiver is turned on, the input circuit 6 is used to activate the PIP function, and first, the channel of the main screen is arbitrarily preset.

At this stage, the channel program function is being executed by the input circuit 6 shown in FIG.
AFT circuit (not shown) for main screen tuner 2
The channel desired by the user is received at the regular frequency by using the AFT voltage from the channel A, and the channel as the present signal is sequentially selected by the tuning circuit 7 and the microcomputer 8.
By using the parent memory channel area 9a of the memory circuit 9
Remember.

Next, the sub-screen channel is preset in the same manner as the main-screen channel preset operation.

In this case, first, the input circuit 6 is used to perform a switching operation so that the sub-picture signal channel tuned by the sub-screen tuner 12 is supplied to the memory circuit 9, and the user desires. Channels as child screen channels are sequentially stored in the child channel memory area 9b of the memory circuit 9. At this time, for example, an ADD / ERASE function is provided, and using this function, presetting is performed so that the channel to be memorized by the input circuit 6 or the channel to be skipped is recorded.

Further, in this way, the channels for the parent screen and the child screen are arbitrarily preset,
When the screen is displayed on the CRT 15, for example, the input circuit 6
When a key (not shown) for switching between the parent screen and the child screen provided on the screen is used to switch to one of the parent screen and the child screen desired by the user and the mode indicating the parent screen is selected, Is read out sequentially from the channel number group set in the parent channel memory area 9a of the memory circuit 9 by operating the keyboard of the input circuit 6 to execute synchronization with the read memory channel. The microcomputer 8 of the station device 7
Controls the main screen tuner 2. As a result, CRT15
The preset channel will be displayed on the screen as the main screen. On the other hand, when the mode showing the child screen is selected, the reading operation is sequentially performed from the channel number group set in the child channel memory area 9b of the memory circuit 9 by operating the keyboard of the input circuit 6 to execute the reading. In order to tune to the read memory channel, the microcomputer 8 of the channel selection device 7 controls the small screen tuner 12. As a result, the channels preset in the CRT 15 are displayed on the screen as a child screen.

Further, by replacing the parent screen memory channel information and the child screen memory channel information stored in the memory circuit 9 by using the parent-child screen switching function (PIPSWAP function) capable of switching the parent-child screen, for example, The user can select a wide range of channels on the parent screen or the child screen.

Therefore, according to this embodiment, the memory circuit connected to the channel selection circuit is provided with the parent channel memory area for storing the channel as the parent screen and the child memory channel area for storing the channel as the child screen. As a result, it is of course possible for the user to preset the channel as the main screen, and also to freely set the channel as the sub screen. As a result, it is possible to switch between the main screen and the sub screen while the PIP function is operating and the screen is displayed, and it is apparent that a channel selection device that is extremely convenient for the user can be provided. Is.

Although the color television receiver having the picture-in-picture function has been described in this embodiment, for example, in a color television receiver not having the picture-in-picture function, A plurality of channel memory areas of the memory circuit may be provided so that at least two or more users can preset desired channel numbers when used in an area having a large number of signals.

In the present embodiment, the picture
When operating the in-picture function, it may be configured to switch using a microcomputer so that the sound of the channel displayed on the screen as a child screen is output to the main. In this case, the parent-child screen replacement function You can enjoy the sub-screen video without using.

Further, in the present embodiment, a BS tuner capable of receiving the satellite broadcast is separately provided, and the satellite broadcast from the BS tuner is configured to be switched to the parent screen or the child screen for screen display. It is also possible to newly provide a memory area for storing the channel as a preset in the memory circuit. In this case, the input circuit is used to switch from the current broadcast.
For the S tuner, the channel of the sanitary broadcasting is selected from the preset information.

[0044]

As described above, according to the present invention, by providing the memory circuit connected to the channel selection circuit with two memory areas, that is, the main screen memory area and the child screen memory area, As a matter of course, the channel number can be preset arbitrarily, and the channel number as the sub-screen can be freely preset as the channel number desired by the user.

Further, the present invention can be easily implemented with the simple structure as described above, and it is needless to say that the effect can be obtained at a low cost.

[Brief description of drawings]

FIG. 1 shows an embodiment of a channel selection apparatus according to the present invention, in which a picture
The block diagram which shows the color television receiver provided with the in picture function.

FIG. 2 is a block diagram showing an example of a conventional channel selection device, showing a color television receiver having a picture-in-picture function, which is configured by using this device.

[Explanation of symbols]

 1 ... Antenna 2 ... Parent screen tuner 3 ... Video intermediate frequency circuit (for parent screen) 4 ... Audio amplification circuit 5 ... Speaker 6 ... Input circuit 7 ... Channel selection circuit 8 ... Microcomputer 9 ... Memory circuit 9a ... Parent channel memory Area 9b ... Child channel memory area 10 ... Video amplification circuit (for parent screen) 11 ... Synthesis output circuit 12 ... Child screen tuner 13 ... Video intermediate frequency circuit (for child screen) 14 ... Video amplification circuit (for child screen) 15 … Cathode ray tube (CRT)

Claims (2)

[Claims] 1. A tuner for frequency-converting a television high-frequency signal received by an antenna, and a video intermediate-frequency circuit for amplifying and detecting an intermediate-frequency signal from the tuner and extracting and outputting a composite video signal. A video intermediate frequency circuit that includes at least an AFT circuit, detects a deviation of the local oscillation frequency of the tuner using the AFT circuit, and outputs the AFT signal, and based on the AFT signal from the video intermediate frequency circuit , AF
A tuning circuit for generating a T voltage and controlling the frequency of the local oscillation of the tuner by using the AFT voltage to select a specific television channel, and a television desired by the tuning circuit. An input circuit provided for selecting a John channel, the input circuit supplying desired channel data to the tuning circuit by using a key, and the input circuit connected to the tuning circuit and supplied from the input circuit. Memory circuit having at least two or more memory areas for storing television channel numbers based on channel data to be stored, and a predetermined channel number from the memory area having at least two or more of the memory circuits is read out and read out. Control means for controlling the tuning circuit to be executed based on the channel number. A channel tuning device characterized in that 2. A first and a second tuner provided for at least two for a main screen and a sub screen for frequency-converting a television high frequency signal received by an antenna, and the first and second tuners. A video intermediate frequency circuit for amplifying and detecting an intermediate frequency signal from a tuner, and extracting and outputting a composite video signal.
A T circuit is provided, and the AFT circuit is used to detect the deviation of the local oscillation frequency of the tuner and
A first and a second video intermediate frequency circuit that outputs a T signal, and an AFT voltage is generated based on the AFT signal from the first or second video intermediate frequency circuit.
A tuning circuit for controlling a frequency of local oscillation of the tuner by using a T voltage to select a specific television channel, and for selecting a desired television channel by the tuning circuit. Input means provided, the input means supplying desired channel data to the tuning circuit by using a key, and the television based on the channel data supplied from the input means and connected to the tuning circuit. A memory circuit for storing at least two memory areas for storing channel numbers, wherein one memory area stores a channel number as a parent screen and the other memory area stores a channel number as a child screen; While reading out a predetermined channel number from the memory area having at least two of the memory circuits, Based on the channel number read in, channel selection apparatus characterized by comprising a control means for controlling so as to execute the tuning circuit.