JPS6376586A - Video tape recorder with av control - Google Patents

Abstract

PURPOSE:To exactly supply an antenna input RF signal from the VTR-side to the TV-side by providing the titled recorder with a switch function to detect the inputting or an AV control signal to an AV control terminal. CONSTITUTION:The terminal of the switch 1' of the Av control terminal 1, is connected to the base of a transistor 3; a control signal is supplied to a control circuit 4 from the emitter of the transistor 3 through resistors 2, 2'. Accordingly in case a connection pin is not inserted in the AV control terminal 1, the emitter of the transistor 3 is at a level L, and no control signals are supplied to the control circuit 4. When a connection pin is inserted, the emitter of the transistor 3 turns to a level H, and a control signal is supplied to the control circuit 4. The change-over switch 7 turns to a connecting point (a) side when the connection pin is inserted in the AV control terminal 1, but to a connecting point (b) side when not inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video tape recorder, and particularly to a so-called A
In a system that has a V control terminal and can control the television receiver side from the video tape recorder side, AV that increases the degree of freedom in channel selection operations on the television receiver.
Relating to a video tape recorder with controls.

[Conventional technology]

This type of AV control terminal is specified in the EIAJ "Interconnection of Television Receivers and Peripheral Devices" T T C-oo3.
As stipulated in It functions so that the

Specifically, the AV control signal is logic (L level)
In other words, when the VTR side is set to PLAY (playback), for example, the input mode on the TV side becomes the video input mode l. Generally, if an operation such as input switching is performed after this operation, the TV side accepts the operation (that is, the last operation is given priority).

Also, after the AV control signal goes from logic 0 (L level) to logic 1 (H level), logic 1 (H level) →
Even if it becomes logic 0 (L level), the input mode on the TV side may not change.

[Problem that the invention seeks to solve]

The problem with conventional VTRs equipped with AV control terminals is that the AV control signal is at logic 0 (
VTR when logic 1 (L level) becomes 2 (H level)
side antenna changeover switch, that is, V f (F R
F signal input and VTR RF converter output (generally, V
When the selector switch for HF (first channel or second channel) is switched to the RF converter output, the VHF RF output of the VTR becomes only the output of the RF converter.

In this state, on the TV side, the VHF antenna is manually operated by RF.
Even if the receiving channel is operated in an attempt to receive a signal, there is a problem that the antenna cannot receive the RF signal because it is not coupled from the VTR side to the TV side.

In the present invention, when the TV side selects video input and audio input with the VTR, TV, and %AV control terminals connected, the TV side can always input VHF antenna human RF signals, and all TV channels can be input. The purpose of the present invention is to provide a video tape recorder with an AV control which is improved so that reception can be performed in the same place.

[Means for solving problems]

The above problem can be solved by installing a switch on the AV control terminal to detect when an AV control signal is input.
When video input or audio input is selected on the TV side by V control signal input, VTR side 0) 'V HF R
Switch the F output signal to the input (7) VHFRF signal and connect it to the TV.
This is achieved by configuring the terminal so that it can receive VHF RF signals.

[Effect]

By providing a switch function to detect the presence of AV control signal input to the AV control terminal,
Antenna human RF signal (VHFR) from the VTR side to the TV side
F signal) can be reliably supplied.

〔Example〕

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

The first section is a block diagram of essential parts showing an embodiment of the uninvented video tape recorder with AV control,
1 is an AV control terminal connected to an AV control terminal (not shown) on the TV side, and a control signal is supplied from the VTR side to the TV side.

In addition, 1' is a switch built into the AV control terminal 1, which is activated when a connection bottle (not shown) is inserted into the AV control terminal, and has a function to detect when an AV control signal is present. has. 2.2' is a resistor, and 6 is a transistor.

4 is a control circuit, 5 is a signal processing circuit that receives the VTR input signal,
A reproduction signal processing circuit 6 is an RF converter which converts the RF signal of the first channel or the second channel of the TV. 7
is a selector switch, 8 is a VHFRF signal input terminal, 9 is a V
) (FRF signal output terminal, 10 is a line output terminal.

In the same figure, switch 1' of AV control terminal 1
Two terminals are connected to the base of the transistor 3, and a control signal is supplied to the control circuit 4 from the emitter of the transistor 2 through resistors 2 and 2'.

That is, when the connection bin is not inserted into the AV control terminal 1, the emitter of the transistor B is at L level, and the control signal is not supplied to the control circuit 4. Furthermore, when the connection bin is inserted, the emitter of the transistor 6 becomes H level, and a control signal is supplied to the control circuit 4.

The control circuit 4 is composed of a microcomputer, etc., and includes a transistor 3.
It receives a control signal caused by the emitter reaching the H level and supplies a switching control signal to the switching switch 7.

Further, V ) (F RF signal input from an antenna or the like is supplied to the signal processing circuit 5 from the input terminal 8 and is connected to the contact a of the changeover switch.

The signal processing circuit 5 includes a recording signal or reproduction signal processing function, and the RF converter 6 converts the input VHF RF signal into a TV.
A converter for supplying a TV with a first channel or a second channel.

Normally, the VHFRF signal input from the input terminal 8 is sent to the signal processing circuit 5. The signal is supplied from the output terminal 9 to the TV side as a signal of an empty channel such as the first channel or second channel of the TV through the RF converter 6 and the contacts of the changeover switch.

The changeover switch 7 outputs the input VHFRF signal from the input terminal 8 as it is to the output terminal 9 from the changeover control signal 1 from the control circuit 4, or outputs the VHFRF signal of the first channel or the second channel through the ELF converter 6. It is possible to switch whether the signal is output to the output terminal 9 or not. This changeover switch 7 is switched to the contact a side when the AV control quad 11 connection pin is inserted, and to the contact a side when the connection pin is not inserted. This switching control is carried out by switch 1' of AV control terminal 1, as described above.
This is performed by a switching control signal outputted from the control circuit 4 based on the operation of the transistor 3 and the ON/OFF state of the transistor 3 accordingly.

Note that the reproduced output of the VTR is output from the signal processing circuit 5 to the TV side from the line output terminal 1o.

With this configuration, it is possible to select a VHFRF signal on the TV side even when the AV control terminal is connected.

〔Effect of the invention〕

As explained above, according to the present invention, when connecting the AV control terminal to watch a TV, it is always possible to select channels on the TV side, which improves the degree of freedom of operation. It is possible to provide a video tape recorder with excellent functions and AV control.

[Brief explanation of the drawing]

Figure e is a block diagram of main parts of a video tape recorder with AV control according to the present invention. 1...AV control terminal 2.2'...Resistor 3...Transistor 4.
...Control circuit 5...Signal processing circuit 6...R
F converter 7-way selector switch 8...VHF RF input 9 -V HF RF output 10...Line output terminal

Claims (1)

[Claims] 1. In a video tape recorder with AV control, which includes at least an RF signal input terminal, an RF signal output terminal, an RF converter, a signal processing circuit, and an AV control terminal, the RF input signal from the RF signal input terminal and the RF converter a changeover switch that selectively connects the output of the RF signal to the RF signal output terminal, a control circuit that provides a changeover control signal to the changeover switch, and a switch provided to the AV control terminal, wherein the switch is connected to the AV control terminal. A video with AV control characterized in that, when a signal is detected, the control circuit switches the changeover switch 1 to a side where an RF input signal from the RF signal input terminal is connected to the RF signal output terminal. Tape recorder.