JPS5932034B2 - Television receiver with recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the operability of a television receiver with a recording device.

Conventionally, when switching from the playback screen of a magnetic recording/reproducing device (hereinafter abbreviated as VTR) to the TV broadcast screen, a switch was used to switch the input signal of the television (hereinafter abbreviated to TV) receiver between the TV broadcast signal and the signal from the VTR. (hereinafter T
The operation was complicated because it was necessary to separately operate the V/VTR switch (abbreviated as V/VTR switch), the tuner of the TV receiver, and the stop button of the VTR.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to simplify the operation by switching from the playback screen to the broadcast screen simply by stopping playback.

The configuration of the present invention detects that the reproduction has been stopped when the VTR is stopped from being reproduced, and uses the signal to switch the TV/VTR switch to the TV side, and also uses a specific channel selection circuit to detect that the reproduction has been stopped. Accordingly, the TV tuner is configured to select a specific channel set in advance, which makes switching from the playback screen to the broadcast screen a single operation, making it extremely simple. FIG. 1 shows a block diagram of an embodiment of the present invention.

1 is a circuit for detecting that the reproduction mode of the VTR is stopped; 2 is a circuit for selecting a preset specific channel; 3 is a TV tuner; and 4 is a TV/VTR switch.

The playback stop detection circuit 1 detects that the playback mode of the VTR has been stopped, and the specific channel selection circuit 2 selects the TV
Select a specific channel on tuner 3. When the TV tuner 3 is switched from the playback mode, the TV/VTR switch 4 is switched to the TV side. TV with the above operation
The receiver screen can be switched from the playback screen to the broadcast screen with a single operation. Note that FIGS. 2 and 3 each show a block diagram of another embodiment of the present invention, and the same circuits as in FIG. 1 are given the same numbers.

It is clear that the same effects as in FIG. 1 can be obtained with the configurations shown in FIGS. 2 and 3. FIG. 4 is a detailed circuit diagram of the block diagram in FIG. 1, and a detailed explanation of the block diagram in FIG. 1 will be given with reference to FIG.

In FIG. 4, the same circuits as in FIG. 1 are given the same numbers. In addition, 6 is a capacitor that blocks direct current, and T is VT.
When the reproduction of TR is stopped, the potential of the signal C, which is turned on when the reproduction of R is stopped, is, for example, +B.
voltage, otherwise it is ground potential. 8 is a channel selection transistor.

In the TV tuner 3, 10 is a tuning switch for receiving VTR signals, 11-12 are T receiver tuning switches, 13, 14-15 are input detection circuits, 16, 17-1
8 is a memory circuit, 19, 20 to 21 are voltage setting circuits, 2
2 is the tuner body. Further, in the TV/VTR switch 4, 23 is a buffer circuit, and 24 is a changeover switch. Furthermore, 5 indicates an RF converter. TV here
Tuning switches 11-12 for tuning, input detection circuits 14-
15, the number of pairs of memories 17-18 and voltage setting circuits 20-21 is provided as many as the required number of channels to select. Next, the operation of this circuit will be explained.

The VTR is in playback mode and the VTR is tuned, and a indicates a broadcast reception signal and b indicates a VTR output signal. When a voltage is generated at the output of the memory 16, the buffer circuit 23 connects the changeover switch 24 to the RF converter 5 side, supplies power to the RF converter 5, operates the RF converter 5, and connects the switch 24 to the RF converter 5 side. The reproduction output b is applied to the tuner main body 22. When playback is stopped in this state, the potential with respect to the signal drops from +B to O, so current flows through the capacitor 6, transistor 7 becomes conductive, and therefore transistor 8 becomes conductive, so that an input signal is input to the input detection circuit 14. A voltage that operates the voltage setting circuit 20 is generated at the output of the memory circuit 17.

At the same time, a reset pulse is applied to each memory so that the memory circuit 16 is reset. Therefore, the output of the buffer circuit 23 becomes O, the changeover switch 24 is switched to the broadcast reception signal a side, and the RF converter 5 also stops operating, so the broadcast signal a is applied to the tuner body 22.
A preset channel is selected by the voltage setting circuit 20, and the screen is switched from the playback screen to the broadcast screen. Conventionally, switching from the TR playback screen to the broadcast screen required three operations: a stop button, switching the TV/VTR switch, and selecting a tuner, but with the present invention, only one operation is required: operating the stop button. can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIGS. 2 and 3 are block diagrams showing other embodiments of the present invention, and FIG. 4 is a detailed circuit diagram of the block diagram in FIG. 1. It is a diagram. 1: Playback stop detection circuit, 2: Specific channel selection circuit,
3: T tuner, 4: T/TR switch.

Claims (1)

[Claims] 1. A circuit that detects a stop of playback when a playback stop operation is performed on a magnetic recording/playback device, a circuit that selects a specific channel of a tuner of a television receiver based on a detection signal from this detection circuit, and a TV broadcast signal and a magnetic recording/playback device. A television with a recording device, characterized in that the television receiver is equipped with a changeover switch that has a function of switching either a reproduced output signal from a TV receiver as an input signal to a television receiver, and a changeover switch that switches to a television broadcast signal side in response to the detection signal. Receiving machine.