JP3481024B2 - Video playback device having BS tuner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video reproducing apparatus having a BS tuner, and more particularly, to a video reproducing apparatus having no dedicated BS decoder input terminal, but having a BS decoder input terminal and an external input. The present invention relates to a video reproducing device such as a television or a video tape recorder having a BS tuner and also serving as a terminal. 2. Description of the Related Art Conventionally, in a video tape recorder having a BS tuner, when a scrambled BS channel is received, a decoder is connected to a dedicated decoder input terminal (see FIG. 7). Thus, a desired channel is selected from video signals (channels) descrambled and output to a screen. At this time, the channel of the program desired to be viewed in the BS broadcast is stored in the memory of the microcomputer in advance,
The microcomputer can automatically select the decoder output (BS tuner) and select the program to be watched simply by operating the channel switching key to set the desired channel.
In the case of a low-cost VTR in which a dedicated decoder input terminal is eliminated and the decoder input terminal is also used as an external input terminal, a return input from a BS decoder is connected to the external input terminal, as in the case where a dedicated decoder input terminal is provided. Then, an input signal from the decoder is output. [0004] However, in a VTR in which a decoder input terminal and an external input terminal are shared,
The channel switching operation (UP /
DOWN) or an external input (tuner / external input), a problem as shown in FIG. 9 occurred. That is, for example, in a VTR having only one external input terminal, for example, BS5ch is set (stored in a memory) as a decoder input in FIG.
When the channel switching operation is performed as shown in (A), the external input is selected after the maximum channel (12 ch) is selected, and the input signal from the external input terminal, that is, the output signal (BS5ch) from the decoder. Is output to the screen. When the channels are further switched, the smallest channel among the decoder input signals, that is, BS5ch is selected. Therefore, as shown by the underlined portion in FIG.
ch) is output to the screen. When the switching operation of the external input (tuner / external input) is performed from the state where BS5ch (tuner side) is selected, the microcomputer selects the input from the external input terminal and performs the same operation as the above-described channel switching. And the output signal (BS5ch) from the decoder is output to the screen. Therefore, as shown in FIG. 9B, the same image is displayed even when the tuner and the external input are switched. In a VTR having two external inputs (a decoder input is connected to a first external input terminal), when the channel switching operation is performed as shown in FIG. As in the case where there is only one input, when the first external input is selected, the smallest (BS5) channel is selected. Further, even when the external input is switched, there is a disadvantage that the same video is output at the location indicated by the underline in FIG. 9D. SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a video reproducing apparatus having a BS tuner which can operate channel switching and external input switching without a sense of incongruity even when the decoder input terminal and the external input terminal are shared. It is. According to the present invention, there is provided a tuner circuit (12) including a television tuner (12a) and a BS tuner (12b), and a selection means (16) for receiving an output of a television tuner as a first input. ), An external input terminal (22) that receives an output from a decoder that receives an output from the BS tuner and provides it to a second input of the selection means, and a video / audio circuit that receives the output of the selection means and outputs a video / audio signal ( 20) first determining means (S3, S1) for determining in response to the operation of the channel up key or the channel down key whether the external input is selected at that time;
7) In response to the negative determination result in the first determination unit, the second determination unit (S7) determines whether the channel is the maximum channel in the case of a channel up key or the minimum channel in the case of a channel down key. , S19), in response to the affirmative determination result in the first determining means, the channel setting means (S5, S23) for setting the minimum channel for the channel up key and setting the maximum channel for the channel down key. ), And in response to the negative determination result of the second determination means, a channel change means (S9, S9) for performing a channel up operation in the case of a channel up key and performing a channel down operation in the case of a channel down key. In the video playback device including S27),
A memory (18a) for storing decoder input setting information for determining whether or not to receive an output from the decoder; and a decoder for referring to the decoder input setting information in response to a positive determination result in the second determining means. A third determining means (S11, S21) for determining whether or not reception of an output from the third means is set, and making the selecting means select an external input in response to a negative determination result in the third determining means. B in which the minimum channel or the maximum channel is set by the channel setting means in response to a positive judgment result in the third judgment means.
This is a video playback device having an S tuner. An image reproducing apparatus having a BS tuner, for example,
In VTR without an external input has only one system, even
The third determining means, which is a microcomputer,
When a positive judgment is made by the second judgment means,
Refer to the decoder input setting information of the
Set the input to receive the output from the decoder
Judge whether it is. Negative in this third determination means
When the result of the objective judgment is obtained, the microcomputer
Therefore, an external input is selected. However, the third judgment means
Therefore, when a positive judgment result is obtained,
Set the minimum or maximum channel by the setting means
Let it. When switching of the external input for switching between the tuner and the external input is performed, the microcomputer determines whether the external input is selected, and when the external input is selected, the tuner is selected. You. If the external input is not selected, it is determined whether or not a decoder input is set in the memory. If the external input is not set, the external input is selected as in the channel switching operation. When the decoder input is set, the video from the tuner is selected without selecting the external input. According to the present invention, when the decoder input is set, the selection of the external input connected to the decoder is prohibited, so that the same video is output continuously or a plurality of times. Operation can be performed without any discomfort. The above and other objects of the present invention,
Features and advantages will become more apparent from the following detailed description of embodiments, which proceeds with reference to the accompanying drawings. Referring to FIG. 1, a video reproducing apparatus 10 according to this embodiment is, for example, a VTR or a TV receiver, and includes a tuner 12, and the tuner 12 includes a VHF band received by an antenna 14a. A television tuner 12a for selecting a signal of a desired channel from a UHF band television high frequency signal and converting the signal to an intermediate frequency, and amplifying a radio wave received by a BS antenna 14b to select a desired channel. And a demodulation BS tuner 12b. An intermediate frequency signal output from the TV tuner 12a or the BS tuner 12b is input to a changeover switch (not shown), and the microcomputer 18 selects one of the tuner outputs. That is, when, for example, a certain channel of the VHF broadcast is selected by the remote controller or the operation keys, a video signal from the television tuner 12 a is output from a changeover switch (not shown), and the video signal is input to the changeover switch 16. On the other hand, when the BS broadcast (tuner 12b) is selected by key input, the output signal from BS tuner 12b is
And the video signal is descrambled. The video reproducing apparatus 10 has an external input terminal 2
2, and an output signal from the decoder 15 is input from the external input terminal 22. That is, the video reproducing apparatus 10 of this embodiment does not have a dedicated decoder input terminal, but also serves as the external input terminal 22 as the decoder input terminal. The output signal from the tuner (television tuner 12a) 12 and the video signal input from the external input terminal 22 are input to the changeover switch 16, and the changeover switch 16 changes the output from the changeover switch 16 according to the mode information based on the key input. Selected. The selected video signal is detected and amplified by the video / audio circuit 20 and then output from the output terminal 26. The microcomputer 18 includes a memory 18a for storing decoder input setting information such as whether or not to receive an output signal from the decoder 15. That is, by selecting a desired channel from the channels of the BS broadcast (decoder input) in advance and storing it in the memory 18a, the descrambled decoder set only by selecting the desired channel by channel switching can be used. Can be displayed on the screen. The decoder input setting can be easily performed because the OSD (On Screen Display) IC 24 displays a list on the screen as shown in FIG. According to the decoder input setting information written in the memory 18a, the microcomputer 18
It is determined whether to select an external input input from the external input terminal 22. More specifically, when the channel is switched by the remote controller or the operation keys, it is determined in step S1 in FIG. 3 whether the "UP" key of the channel has been pressed. If the “UP” key is pressed,
In step S3, it is determined whether an external input has been selected. If the external input is not selected and the output signal of the tuner 12 is selected, it is determined in step S7 whether the channel selected by a channel selection device (not shown) included in the microcomputer 18 is the maximum. If not, the channel is switched to a larger channel in step S9. If it is the maximum channel, it is determined in step S11 whether the above-described decoder input setting has been made. Then, when the setting information for turning off the decoder input for each BS channel shown in FIG. 2 is stored in the memory 18a, that is, when it is set not to select the input from the decoder, in step S13, External input is selected. That is, as shown in FIG.
After selecting the maximum channel 12ch, the external input is selected. A switch (not shown) is provided at the external input terminal 22 so that an input from the decoder 15 and an external input can be switched.
May not be set. On the other hand, when a channel to be tuned is selected from a plurality of BS channels and the decoder input setting information is stored in the memory 18a by the decoder input setting shown in FIG. The smallest channel is selected from the channels. That is,
As shown in FIG. 4B, when the decoder input is set, the microcomputer 18 selects the output of the tuner 12 without selecting the external input. If the "UP" key for switching the channel has not been pressed, at step S15,
It is determined whether the "DOWN" key of the channel has been pressed. When the “DOWN” key is pressed, the “U”
As in the case where the "P" key is pressed, it is determined in step S17 whether an external input is selected. If the tuner 12 is selected, step S19 is performed.
In, it is determined whether or not the selected channel is the minimum. If the smallest channel has been selected, it is determined in step S21 whether or not there is a channel to be input to the decoder from among a plurality of BS channels. If there is a desired channel that has been set (in FIG. 2, the channel is set to the decoder input setting “ON” state), the maximum channel is selected in step S23. If the decoder input has not been set, external input selection is permitted in step S25.
If “NO” in the step S19,
In step S27, a smaller channel is selected.
Further, if the channel switching is not operated, it is determined in step S29 whether or not the "input switching" key for switching between the external input and the tuner is pressed.
When the key is pressed, it is determined in a step S31 whether an external input is selected. If the external input has been selected, the tuner is selected in step S31. If the external input has not been selected, it is determined in step S35 whether or not the decoder input setting described with reference to FIG. 2 has been made. If the decoder input is not set, that is, if the decoder input setting is “OFF” in FIG. 2, in step S37,
Selection of an external input is allowed (see FIG. 4C). However, when the decoder input is set, the tuner is selected in step S33, and the selection of the external input is prohibited as shown in FIG. As described above, even when the decoder input terminal is also used as the external input terminal 22 without having a dedicated decoder input terminal, selection of the external input when the decoder input is set is performed. Is prohibited, so FIG. 9
As described in (A) and (B), the same video is not displayed on the screen continuously (or a plurality of times). The same effect can be obtained not only in the case where there is only one external input but also in the case where there are a plurality of external inputs as shown in FIG. That is, the video reproducing apparatus 10 of another embodiment shown in FIG. 5 has two external input terminals 22a and 22b.
, And external input terminal 22a receives external 1 input and decoder input in common. The microcomputer 18 is configured as shown in FIG.
As in the embodiment shown in (1), whether to select an external input is determined based on the decoder input setting information stored in the memory 18a. That is, when the channel switching and the input switching are operated, the microcomputer 18 operates according to the algorithm described above with reference to FIG. Therefore, for example, as shown in FIG.
5, when the channel input is operated and the decoder input is not set, as shown in FIG.
Each external input is selected. When the decoder input is set, selection of one external input is prohibited as shown in FIG. On the other hand, when input switching for switching between the tuner and the external input is operated, when the decoder input is not set,
As shown in FIG. 6C, when the external 1 input and the external 2 input are selected and the decoder input is set, the external input terminal 22a connected to the decoder is connected to the external input terminal 22a in the same manner as when switching channels. Selection of one external input is prohibited (see FIG. 6D).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is an illustrative view showing one example of a screen output at the time of setting a decoder input in the embodiment of FIG. 1; FIG. 3 is a flowchart showing a part of the operation of the embodiment in FIG. 1; FIG. 4 is an illustrative view showing one example of a screen output when channel switching and input switching are operated in the embodiment of FIG. 1; FIG. 5 is a block diagram showing another embodiment. FIG. 6 is an illustrative view showing one example of a screen output when channel switching and input switching are operated in the embodiment of FIG. 5; FIG. 7 is a block diagram showing a conventional technique. FIG. 8 is a flowchart showing an example of an operation in the related art. FIG. 9 is an illustrative view showing one example of a screen output at the time of operating channel switching and input switching in the prior art. [Description of Signs] 10 ... Video playback device 12 ... Tuner 16 ... Changeover switch 18 ... Microcomputer 22, 22a, 22b ... External input terminal

Claims (1)

(57) Claims: 1. A tuner circuit (12) including a television tuner (12a) and a BS tuner (12b), and a selecting means (1) for receiving an output of the television tuner as a first input.
6) an external input terminal (22) which receives an output from a decoder which receives an output from the BS tuner and provides it to a second input of the selecting means, and a video which receives the output of the selecting means and outputs a video / audio signal An audio circuit (20), first judging means (S3, S17) for judging whether an external input is selected at that time in response to operation of a channel up key or a channel down key, and negative in the first judging means Second determining means (S7, S19) for determining whether the channel is the maximum channel in the case of the channel up key and determining whether the channel is the minimum channel in the case of the channel down key in response to the determination result; Responsive to a positive determination by the means, setting a minimum channel in the case of the channel up key;
In the case of the channel down key, the channel setting means (S5, S23) for setting the maximum channel, and in response to the negative judgment result in the second judgment means, the channel up operation is performed in the case of the channel up key. In the video reproducing apparatus provided with channel changing means (S9, S27) for performing the channel down operation in the case of the channel down key, decoder input setting information for determining whether or not to receive an output from the decoder (18a) storing the following, and in response to the positive determination result in the second determination means,
A third determination unit (S11, S21) for determining whether reception of an output from the decoder is set with reference to the decoder input setting information; and a negative determination in the third determination unit. The selection means selects the external input in response to a result, and the channel setting means sets a minimum channel or a maximum channel in response to a positive determination result in the third determination means. A video playback device having a BS tuner.