JPH03125578A - Tv broadcast receiver with rf input automatic switching function - Google Patents

Abstract

PURPOSE:To switch an input channel automatically in response to a signal fed to an RF signal input terminal by selecting 2 systems of RF inputs or over automatically by means of a microcomputer. CONSTITUTION:A video output changeover switch 10 selects a video signal received by a TV tuner 4 and a reproduced video signal from a video recording and reproducing circuit 9 based on the control of a microcomputer 5 and outputs the selected signal to an RF modulator 12. An RF signal input changeover switch 3 selects an input commanded by an RF input switching signal 7 from the microcomputer 5 and gives an RF signal 11 to the TV tuner 4. Thus, the microcomputer 5 selects the RF input switch at the setting mode of TV channels in advance and stores channels with programs broadcast to them and the mode of the RF input switch, then the RF mode is selected automatically by the microcomputer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a TV broadcast receiving device, and in particular, to a TV broadcast receiving device.
A TV with an RF input automatic switching function that allows automatic switching between V broadcast reception channels and cable TV broadcast reception channels.
The present invention relates to a broadcast receiving device.

[Conventional technology]

With the expansion of TV broadcasting services, in addition to conventional spatial broadcasting, cable TV broadcasting using cable as a medium has come to be widely used by general viewers.

On the other hand, the received TV broadcast signal is recorded by a magnetic recording and reproducing device (VT).
R), there are many opportunities to record and play back not only regular TV broadcasts, but also receive the above cable TV broadcasts and transmit them to VT.
Recordings using R have become rarer.

For information on the external RF input function of conventional VTRs, see, for example, the June 1987 issue of Monthly Videocom, published by Gakushu Kenkyusha.
Examples include those described on pages 44 to 45.

[Problem to be solved by the invention]

In the conventional VTR mentioned above, the RF input terminal (VHF).

UHF) is provided on each back panel,
VTR users must switch the RF double signal using a manual switch, etc., depending on the usage of the connection to the input terminal for normal TV broadcasting (hereinafter simply referred to as TV broadcasting) and cable TV broadcasting. However, there is a problem in that it is complicated to handle.

SUMMARY OF THE INVENTION An object of the present invention is to provide a TV broadcast receiving device with an RF signal automatic switching function that eliminates the problems in the prior art described above and automatically switches input channels according to the signal supplied to the RF signal input terminal. It's about doing.

[Means to solve problems]

The above object is achieved by providing a controller (microcomputer 2 or less, microcomputer) for controlling the TV tuner, and configuring automatic switching by the microcomputer having two or more systems of large RF inputs.

[Effect]

In the automatic channel setting mode, the TV tuner detects the presence or absence of broadcasting on each channel under control from the microcomputer, and then sequentially switches the large RF inputs to set the channels.

Based on the result of this channel setting, the above microcontroller
Automatically controls large F input to select a broadcasting channel.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating an embodiment of a TV broadcast receiving device with an RF input automatic switching function according to the present invention,
1 is the antenna input for receiving TV broadcasts, 2 is the cable input for receiving table TV broadcasts, 3 is RF
Signal input changeover switch, 4 is a TV tuner, 5 is a microcomputer as a TV tuner controller, 6 is a magnetic head of a video recording and reproducing device (Vo3゛TR), 7 is an RF signal manual switching signal, 8 is a tuner control signal, 9 10 is a video output changeover switch; 11 is an RF multiplied signal 12 is an RF modulator; and 13 is an RF signal output terminal.

In the figure, two systems of RF signal inputs, an antenna input 1 and a cable input 2, are connected to the RF signal input changeover switch 3. The RF signal input changeover switch 3 is given an RF signal input changeover signal 7 in advance and set to a specific input side.

The TV tuner 4 is given a tuner control signal 4 in advance to receive a specific broadcast.

The received signal is sent to the video recording and reproducing circuit 9 and the video output changeover switch 10.

Further, the magnetic head 6 records the received signal from the video recording/reproducing circuit on the magnetic tape and reproduces it.

On the other hand, in the video output changeover switch 10, the TV tuner 4
The received video signal and the reproduced video signal from the video recording and reproducing circuit 9 are selected and switched under the control of the microcomputer 5, and the RF
Output to modulator 12. The RF signal input changeover switch 3 is switched to the input side designated by the RF input changeover signal 7 from the microcomputer 5, and connects the RF signal 11 to the TV tuner 4.

The channel detection means can be configured to detect the carrier wave of the input RF signal, or to detect whether there is a TV broadcast on the channel based on the presence or absence of a synchronization signal.

As described above, according to this embodiment, the microcomputer 5 switches the RF input switch in the TV channel setting mode, memorizes the broadcasting channel and the mode of the RF input switch, and sets the RF mode. Microcomputer 5 can be automatically selected.

〔Effect of the invention〕

As explained above, according to the present invention, since the controller that controls the TV tuner stores in advance the channels of TV broadcasting, the VTR user does not have to perform a switching operation every time an RF signal is input. It is possible to eliminate the drawbacks of the prior art and provide a TV broadcast receiving apparatus with an RF input automatic switching function having excellent functions.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an embodiment of a TV broadcast receiving apparatus with an RF input automatic switching function according to the present invention. 1... Antenna input, 2 ・Cable input, 3...R
F signal input selector switch, 4...TV tuner, 5.
・・Microcontroller as TV tuner controller, 6・
Magnetic head, 7...RF signal input switching signal, 8. Tuner control signal, 9... Video recording and reproducing circuit, 10...
Video output selector switch, 11...RF double signal 12...
・RF modulator, 13...RF signal output terminal.

Claims (1)

[Claims] 1. A TV broadcast receiving device with an RF input automatic switching function, which has a TV tuner and two or more systems of RF signal input terminals, and is equipped with a channel selection function and an RF signal input switching function. The tuner is equipped with a channel detection means, the RF signal input switching means has at least two systems of RF signal input switching means, and the RF signal input switching means is automatically switched based on the detection result of the channel detection means. A TV broadcast receiving device with an RF input automatic switching function. 2. The TV broadcast receiving apparatus with an RF signal automatic switching function according to claim 1, wherein the TV tuner includes means for selectively receiving a spatial TV broadcast signal and a cable TV broadcast signal. 3. The TV broadcast receiving apparatus with an RF signal automatic switching function according to claim 1, wherein the channel detection means of the TV tuner includes synchronization signal detection means for detecting a synchronization signal of a received TV signal.