JPH04284070A - Ghost removal tuner provided with reserving function - Google Patents

Abstract

PURPOSE:To provide the device enabling reserved recording by automatically switching and connecting a video signal eliminating a ghost signal eliminated by a built-in tuner and a video signal inputted from an outside video equipment to one system of a VTR with input terminal without changing the connection between the equipments. CONSTITUTION:This tuner has a means provided to switch and output the video signal and audio signal received by a built-in tuner 1 and eliminated the ghost signal by a ghost eliminating circuit 3 and the video signal inputted from the outside equipment at a switching circuit 9, and the switching circuit 9 is constituted to be controlled by a detection circuit 7 and a signal switching control circuit 10 according to an ON/OFF signal applied from the outside VTR to an interlocked power supply input terminal 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ghost removal tuner with a reservation function used in a television receiver or a video tape recorder.

0002

2. Description of the Related Art In recent years, a new type of color television broadcasting, EDTV (referred to as clear vision), has begun, and tuners equipped with ghost removal devices have therefore been commercialized. Nowadays, television receivers compatible with clear vision are more expensive than conventional ones, so ghost removal devices are often commercialized separately as television tuners rather than being incorporated into television receivers. The ghost removal tuner can be connected to a television receiver to receive images from which ghosts have been removed, or can be connected to a video tape recorder (hereinafter abbreviated as VTR) to record video signals from which ghosts have been removed. ing. Today's VTRs are generally equipped with a recording reservation function, and ghost removal tuners are also required to support recording reservations.

The recording reservation function of the conventional ghost removal tuner will be explained below with reference to FIG.

As shown in FIG. 2, a ghost removal circuit 3 is provided on the output side of a VIF detector 2 following a tuner 1 incorporating an intermediate frequency amplification circuit, and outputs a video signal from a video output terminal 12. An audio multiplex decoder 5 is provided following the SIF detector 4, and an audio signal is output from an audio output terminal 13.

Further, a detection circuit 7 detects whether or not power is being supplied from the VTR to the interlocking power input terminal 11, and a power supply control circuit 6 that controls the power supply for the signal processing circuit and a tuner 1 detect the result. The channel selection circuit 8 is configured to output the signal to the channel selection circuit 8 which selects the channel.

The ghost removal tuner is constructed as described above, and its reservation function will be explained below.

As for signal processing, first, the television signal input to the tuner 1 is converted to an intermediate frequency and outputted, the video signal is detected by the VIF detector 2, and the ghost signal contained in the output signal is sent to the ghost removal circuit 3. The signal is removed by the video signal output terminal 12 and output to the video signal output terminal 12. The audio signal is detected by the SIF detector 4, and the output is processed by the audio multiplex decoder 5 and output from the audio signal output terminal 13.

[0008] The reservation function of the ghost removal tuner is
It works in conjunction with the timer reservation as follows.

[0009] A VTR for which a timer reservation has been made starts recording operation when the reserved time comes. At this time, power is supplied to the interlocking power input terminal 11. The ghost removal tuner detects that power is supplied from the VTR to the interlocking power input terminal 11 by the detection circuit 7, and the equipment is controlled by the tuning circuit 8 and the power control circuit 6, and the video signal output terminal 12 and the audio signal are controlled by the tuning circuit 8 and the power control circuit 6. A signal is output to the output terminal 13. Although this signal is not shown in FIG. 2, by inputting it to the external input terminal of the VTR and recording it, the signal from which the ghost has been removed can be scheduled for recording using the timer function of the VTR.

0010

[Problems to be Solved by the Invention] However, in the above-mentioned conventional configuration, when recording on a VTR, one input terminal is used.
VTRs that have only one system have a problem in that only the output of the ghost removal tuner is connected, and the output from other devices such as a BS tuner cannot be scheduled for recording at the same time.

[0011] The present invention solves the above problems, and has the following features:
To provide a device which enables scheduled recording of a television signal from which ghosts have been removed and an output signal of other equipment such as a BS tuner, even in a VTR equipped with a system input terminal, without changing the connection between the equipment.

0012

[Means for Solving the Problems] In order to achieve the above object, the ghost removal tuner of the present invention includes a switching circuit that switches between a signal from another device such as a BS tuner and a signal received by the built-in tuner and from which ghosts have been removed. This device simultaneously includes a detection circuit connected to an interlocking power input terminal from a VTR and a signal switching control circuit that controls signal switching according to an output signal from the detection circuit. Therefore, at the scheduled recording time, power is supplied from the VTR to the interlocking power input terminal. It detects the input of the interlocking power supply and selects and outputs either a ghost removal signal or a signal from another device.

[0013]

According to the present invention, with the above-described configuration, it is possible to switch between the output signal from the ghost removal tuner and the signal from other equipment and perform scheduled recording on the VTR.

[0014]

Embodiment An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the components from the tuner 1 to the channel selection circuit 8 are the same as those shown in the conventional example shown in FIG. 2, so their explanation will be omitted. In the embodiment of the present invention, a switching circuit 9 is provided before the video signal output terminal 12 and the audio signal output terminal 13, and a signal switching control circuit 10 is provided on the output side of the detection circuit 7 connected to the interlocking power input terminal 11. This is a newly established configuration.

To explain the operation of the above configuration, the video signal processed by the ghost removal tuner is output from the ghost removal circuit 3, while the audio signal is output from the audio multiplex decoder 5. The video signal and audio signal from the ghost removal tuner and the video signal and audio signal from other devices inputted from the video signal input terminal 14 and the audio signal input terminal 15 are input to the switching circuit 9. Here, the switching circuit 9 is operated by a signal from a signal switching control circuit 10, and is connected to a VTR not shown in FIG.
Based on the ON/OFF signal applied to the interlocking power supply input 11 from the detection circuit 7, the input state of the interlocking power supply is known, and the switching circuit 9 is controlled by the signal switching control circuit 10. The order in which the switching circuits 9 are switched can be freely set.

As described above, according to the present embodiment, video signals and audio signals are controlled in accordance with the control signals from the signal switching control circuit 10 that is controlled in a reserved order in conjunction with the detection output from the detection circuit 7 that detects the state of the external power supply. By providing a switching circuit 9 designed to switch signals, and providing these at the same time in the ghost removal tuner, the video and audio signals received by the built-in tuner and the video and audio signals received by the built-in tuner and from which ghosts have been removed can be connected to the external power source. It can be outputted in conjunction with the ON/OFF signal.

[0018]

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, although it is a ghost removal tuner,
By providing an audio signal input terminal, an external power supply detection circuit, a video/audio signal switching circuit, and a control circuit that controls the switching circuit in conjunction with the output of the detection circuit, ghost removal signals and signals from other devices such as a BS tuner can be removed. Accordingly, it is possible to realize a ghost removal tuner with a reservation function, which has better operability and enables reservation recording of signals and signals on a VTR.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a ghost removal tuner in an embodiment of the present invention.

[Figure 2] Block diagram of a conventional ghost removal tuner

[Explanation of symbols]

1 Tuner 3 Ghost removal circuit 5 Audio multiplex decoder 6 Power control circuit 7 Detection circuit 8 Tuning circuit 9 Switching circuit 10 Signal switching control circuit

Claims (1)

[Claims] Claim 1: A video/audio input terminal for inputting a video/audio signal from an external device, the video/audio signal applied to the input terminal, and the video signal and audio received by a built-in tuner and ghost removed. Turn on the signal from an external power supply
2. A ghost removal tuner with a reservation function, comprising means for switching in conjunction with a /OFF signal, and outputting the switched video signal and audio signal to an output terminal.