KR20000001258U - VSI's RF Modulator Switching Circuit - Google Patents

Abstract

The present invention relates to a device for switching the output of the RF modulator when the playback mode is performed in the VSI, conventionally, the output of the RF modulator is always in the state of the video signal processing such as the playback mode or the channel receiving mode in the VSI The RF modulator continues to be output even when a line connection method that does not require the output of the RF module is connected to the receiver, or when connected to a TV receiver via a scart jack in Europe. There was a problem that was exhausted.

The present invention is to solve the problem of the conventional key input unit 40 having a variety of function keys, including the RF modulator on / off mode key, and if there is an RF modulator off key press in the key input unit 40 to recognize this VMI microcomputer 41 for outputting a control signal for turning off the RF modulator 44, an RF modulator switching unit 43 switched under the control of the VMI microcomputer 41, and the RF modulator switching unit It is characterized by including the RF modulator 44 which is turned on / off by (43).

Description

VSI's RF Modulator Switching Circuit

The present invention relates to a circuit for switching the output of the RF modulator when the playback mode is performed in VSI. In particular, the video and audio signals processed in VSI can be connected to a line connection or a scat jack connection method (in case of European VSI). In the case of transmission to the TV receiver, the output of the RF modulator is turned off under the control of the VMI microcomputer when performing the playback mode or the channel reception mode of the VSI. It is to reduce power consumption.

In general, the RF modulator of VSI is to modulate the video signal and the audio signal from the VSI system into a broadcast signal (TV signal). The broadcast receiving system of VSI having such a conventional RF modulator is shown in FIG.

That is, VHF and UHF antennas 21 and 23 pass through the set distributors 22 and 24 to the VV 2 to 13 channels and the VHF 14 to 83 channels. The signal tuned from the Vial-side tuner 4 is provided to the video head via a record / playback amplifier 28 to record the signal on the loaded video tape 29, At the time of reproduction, the RF modulator 27 is modulated into a three-channel or four-channel channel secured as an empty channel on the television receiver 10 side, and is provided to the television receiver 10 through the switch unit 26 and an external connection jack. will be.

In the above system, a system circuit for modulating a broadcast signal through the RF modulator 27 on the VSI side and providing it to the television tuner side is shown in FIG.

That is, the signal tuned to the tuner 31 from the antenna is processed through the RF modulator 27 which converts the intermediate frequency processing and amplification / demodulation in the IF part 32 into a VSI channel which is an empty channel on the television side. It is to be provided.

At this time, the method of transmitting the video and audio signals processed from VSI to the TV receiver includes an RF connection method for transmitting the modulated video and audio signals by connecting the RF modulator and TV receiver of VSI to the connection jack as described above; There is a line connection method that connects processed video and audio signals to lines.

In general, VSI is used as the line connection method except in special cases because the line connection method is superior in image quality and sound quality than the RF connection method.

However, conventionally, in the state where the video signal processing such as the playback mode or the channel reception mode is performed in VSI, the RF modulator output is always transmitted to the television receiver, so that the line connection method that does not require the RF modulator output is employed, or Even when connected to the TV receiver through the SCAT jack in the EU-oriented VSI, there was a problem that the RF modulator is continuously in the output state and unnecessary power is consumed.

The object of the present invention is to transmit the video and audio signal processed in VSI to the TV receiver by line connection or skajack connection (in case of European VSI) in order to improve the problems of the prior art as described above. The VSI to reduce the power consumption of the RF modulator that is in an output state unnecessarily at the time of use of the VSI by turning off the output of the RF modulator by the control of the VMI microcomputer when performing the playback mode or the channel receiving mode of the AV receiver. To provide an RF modulator switching circuit.

1 is a system schematic diagram illustrating a broadcast receiving system in a conventional VSI system;

FIG. 2 is a reference view of the television / TV switch portion of FIG. 1; FIG.

3 is a circuit block diagram according to the present invention,

4 is a flowchart showing the operation of the present invention.

** Explanation of symbols on main parts of the drawing **

40: key input section 41: VSI Micom

42: OSD 43: RF modulator switching unit

44: RF modulator

In order to realize the object of the above example, the present invention provides a key input unit having various function keys including an RF modulator on / off mode key, and an RF modulator off key press for recognizing the key input unit to turn off the power of the RF modulator. And a RF modulator switching unit switched under the control of the BC MICOM, and an RF modulator operated on / off by the RF modulator switching unit.

Hereinafter, more specific features of the present invention will be understood by describing the same in detail with the accompanying drawings.

The video signal recorded on the video tape is RF-modulated by the RF modulator via the signal processing circuit of VSI, transmitted through the receiving antenna of the television receiver, and appears as an image on a TV screen. The signal is converted back to the RF channel under the control of BC MICOM and output through 3 or 4 channels of the television.

However, if the video and audio signals are sent to the television receiver through the line connection method in the above process, the RF modulator output is unnecessary. In addition, in case of European VSI, the RF modulator output is unnecessary even when the TV mode of pin 8 is performed when the TV jack is connected to the TV receiver through a scart jack.

Since all RF modulator outputs are unnecessary power consumption in this case, there is a need to control the RF modulator output.

Applying the present invention to control the output of the RF modulator is as shown in FIG. That is, FIG. 3 is a block diagram showing an RF modulator switching device of VSI according to the present invention.

The present invention recognizes a key input unit 40 having various function keys including an RF modulator on / off mode key, and if there is an RF modulator off key press on the key input unit 40, the power of the RF modulator 44 is turned off. On / off operation by the VMI microcomputer 41 which outputs a control signal for making the control signal, the RF modulator switching unit 43 switched under the control of the VMI microcomputer 41, and the RF modulator switching unit 43 The RF modulator 44 is included.

By the above configuration, the present invention operates as shown in FIG. 4.

If the user enters the OFF mode key among the RF modulator ON / OFF mode keys installed on the VSI set side or the key input unit 40 of the remote control, the VMS microcomputer 41 determines that the playback mode is performed. If it is determined that there is an input (step 100), an OFF signal, that is, a "high" signal, is sent to the RF modulator switching unit 43 (step 101).

In this case, the user may select the RF modulator off mode by using the OSD screen output through the OSD unit 42.

That is, when the user presses the RF module on / off mode key of the VSI set side or the remote control key input unit 40, the user selects the on / off of the RF modulator power by the control of the VMI microcomputer 41. The OSD menu screen is displayed.

At this time, the user may move the remote control cursor on the OS menu screen to select the RF modulator off mode. Normally the on mod of the RF modulator defaults, so the user only needs to select the off mode.

Accordingly, when the user selects the RF modulator off mode, the VMI microcomputer 41 recognizes this and outputs a 'high' signal, which is the RF modulator off signal. Accordingly, the switching transistor constituting the RF modulator switching unit 43 is Is off.

When the switching transistor is turned off, M5V, which is a modulator power supply provided to the RF modulator 44, is turned off (step 102). Accordingly, the output of the RF modulator 44 is also stopped.

The RF modulator 44 does not emit any output signal unless the user selects the RF modulator on mode key again by using the key input unit 40 of the remote control or VSI set key.

As described above, the present invention is performed when the playback mode or channel reception mode of VSI is transmitted when the video and audio signals processed by VSI are transmitted to the TV receiver using the line connection method or the skat jack connection method (in case of European VSI). By turning off the output of the RF modulator 44 under the control of the VMI microcomputer 41, there is an advantage that the power consumption of the RF modulator that is continuously in an output state can be reduced unnecessarily when performing the VSI regeneration mode.

Claims (1)

A key input unit 40 having various function keys including an RF modulator on / off mode key, and a control for turning off the power of the RF modulator 44 by recognizing the RF modulator off key press in the key input unit 40. RF modulator 41 for outputting a signal, an RF modulator switching unit 43 switched under control of the BC MICOM 41, and an RF modulator operated on / off by the RF modulator switching unit 43. A BC modulator switching circuit comprising (44).