JPS6325432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal switching circuit in a magnetic recording/reproducing device incorporating an imaging device.

In general, a magnetic recording/playback device (hereinafter abbreviated as VTR) with a built-in tuner for broadcast reception usually records the tuner signal and automatically records the external input signal when the signal is input to the external input terminal. It is configured. This situation will be explained using FIG. Note that FIG. 1 is a block diagram showing a signal switching circuit of a conventional VTR. In other words, the VTR 1 with a built-in tuner is provided with an external input terminal 4 with a switch, and normally the signal from the tuner 3 is
It has been added to VTR section 2. The switch is switched only when an external input signal is input, and the external input signal is applied to the VTR section.
The signals described here include video, audio, etc., but for convenience of explanation, they will be treated as one signal.

In Figure 1, a VTR with a configuration in which tuner 3 is replaced with an imaging device such as a video camera is a VTR with a built-in video camera (hereinafter referred to as
It can be thought of as a recording camera (sometimes referred to as a recording camera).

FIG. 2 is a conceptual diagram showing the connection between such a recording camera and external equipment. In the figure, a recording camera 5 has a built-in video camera 6. Note that 7 is an external device, 8 is a connection cable, 9 is an external input signal, and 10 is a built-in camera signal.

Now, in any operation mode other than built-in camera recording, the recording camera 5 must be connected to some external device 7 via a connection cable 8 for external power supply drive and monitoring. When recording from a tuner (not shown) provided in the external device 7, a signal from the tuner is inputted to the external input terminal 4 as an external input signal 9. Of course, the external input signal 9 can be included in the connection cable 8, but in any case, the built-in camera signal 1
To switch between 0 and external input signal 9, use external input terminal 4.
This is done by attaching and detaching the connector.

As mentioned above, in the conventional way of thinking, switching between the built-in camera signal and external input signal cannot be controlled from an external device. In response to user requests,
It was not possible to answer this question without changing the connection to external equipment.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a magnetic recording and reproducing device with good operability, in which switching between a built-in camera signal and an external input signal can be easily performed by operating an external device as intended by the user. An object of the present invention is to provide a signal switching circuit for use in a computer.

In order to achieve the above-mentioned object, this invention:
It is characterized by a signal switching means that selects whether the signal to be recorded is a built-in camera signal or an external input signal using an external control signal, and the built-in camera signal is normally selected and the external input signal is selected only when necessary. It is.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing a signal switching circuit of a magnetic recording/reproducing apparatus according to an embodiment of the present invention.

In the same figure, a recording camera 11 having an external input terminal 17 has an external input terminal 17 for controlling a signal switching circuit 14 for switching between a built-in video camera 13 signal and an external input signal 18 as signals to be recorded in a VTR section 12. It has a control terminal 15. Therefore, signals to be recorded can be freely switched from the external device 20. Of course, the connection between the recording camera 11 and the external device 20 can be integrated here.

The external device 20 has an external input terminal 2 with a switch.
1, and unless an external signal is input to the external device 20, the external control signal 16 is not driven, and the built-in camera signal recording state is normally maintained.

Next, when an external signal is input, the switch of the external input terminal 21 with a switch is operated mechanically, the external control signal 16 is driven by the power supply +B, and the signal switching circuit 14 automatically switches to the external input signal recording state. Switch to .

The above explanation is based on mechanically detecting that an external input signal is input to the external input terminal 21 installed in the external device 20 and outputting the external control signal 1 to the recording camera side.
This is an example in which 6 is driven.

On the other hand, FIG. 4 shows an embodiment in which the presence or absence of the external input signal 18 is detected by a signal detection circuit and the external control signal 16 is driven. In FIG. 4, 23 is such a signal detection circuit. In this case, the external input terminal 22 does not need to be equipped with a switch.

Further, as shown in FIG. 5, when the external device 20 has a built-in tuner 26, the external control signal 16 is driven by a changeover switch 27 provided in the external device 20 and operable from the outside. It is possible to switch between a camera signal, a tuner signal, and an external signal applied to the external input terminal 25. The external input terminal 25 used here is the first
It is the same as the one shown in the figure.

As described above, according to the present invention, it is possible to externally control whether the signal to be recorded is a built-in camera signal or an external input signal.
The signal can be easily switched as intended by the user without changing the connection with external equipment.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional VTR signal switching circuit, Fig. 2 is a conceptual diagram explaining the connection between a recording camera and external equipment, and Fig. 3 is a block diagram showing an embodiment of the present invention. , FIG. 4, and FIG. 5 are block diagrams showing other embodiments of the present invention. Code explanation, 11...Recording camera, 12...VTR section,
13...Video camera, 14...Signal switching circuit,
15...External control terminal, 20...External device, 21...External input terminal with switch.

Claims (1)

[Scope of Claims] 1. In a signal switching circuit in a magnetic recording and reproducing device incorporating an imaging device, a signal to be recorded in the magnetic recording and reproducing device is inputted to the magnetic recording and reproducing device from an image signal from the built-in imaging device and an external source. It has a signal switching means for switching between external input signals, and the switching means is configured to switch between an external input signal and an external device connected to the magnetic recording/playback device under the following three conditions. That is, (a) when instructed by a switch that mechanically operates when an external input signal is input to the external input terminal installed on the external device; and (b) when an external input signal is input to the external input terminal installed on the external device. (c) When an instruction is given by a detection circuit that electrically detects that an input signal has been input, (c) Even if no external input signal is input to the external input terminal installed in the external device, A magnetic recording device characterized in that the signal to be recorded is switched from the imaging signal to the external input signal when receiving an external control signal that is output when any of the following conditions is satisfied: Signal switching circuit in playback equipment.