KR0119482Y1 - User terminal control circuit for recording/reproducing equipments - Google Patents

Abstract

A recording and reproducing apparatus having a television signal tuner and an RF modulator, wherein the subscriber terminal device control circuit is capable of recording a signal from a cable box provided on a commercial CATV and an air television signal, respectively, on a recorder and watching a different channel with a television receiver. Is disclosed.

Description

Subscriber terminal device control circuit of the recording and playback device

1 is a detailed circuit diagram of a subscriber station device control circuit according to the present invention.

FIG. 2 is a circuit diagram of the distributor shown in FIG.

* Explanation of symbols for main parts of the drawings

10: RF amplifier 12, 14: distributor

16: Recording unit SW_A, SW_B, SW_C: RF switch

The present invention relates to a recording and reproducing apparatus (VCR) having a tuner for a television signal and an RF modulator, and more particularly, to a descrambled signal and antenna in a cable box provided in a commercial CATV. The present invention relates to a subscriber station device control circuit for recording a channel multiplexed signal with a recorder and receiving a television receiver.

CATV (cable TV) is a TV that provides a variety of services by transmitting a high-quality channel multiplexed aerial TV signal received by a high-sensitivity antenna to a plurality of subscribers or adding a two-way transmission function by using the broadband of coaxial cable. Say the system. The operator of CATV supplies a regular public television signal that can be received or a separately designed program. The signal transmitted over the cable is scrambled. The subscriber may have an appropriate subscriber box (cable box) to receive the transmitted signal.

On the other hand, a conventional recording / reproducing apparatus such as V-Cal has an air television signal received with a lip force terminal for a subscriber terminal device, an input terminal for receiving a signal from an antenna / cable, an output terminal and a splitter connected to a television, and the like. Alternatively, CATV signals can be recorded or viewed on a television.

The VR supplies the signal from the divider to the TV tuner or the subscriber station and selects each processed signal as a switch and supplies the signal to the signal processor. The signal processing unit modulates the input signal into a recording signal, records it through a recorder, or RF modulates the signal to a television receiver.

In such a control device, it is not possible to record a signal from a subscriber station device through a recorder while simultaneously watching a broadcast of another channel or vice versa. In order to solve this disadvantage, US Patent 4,630,133 discloses a subscriber station device control circuit consisting of five switches. However, this has the disadvantage that the configuration of the switch is complicated and very difficult to operate.

Accordingly, an object of the present invention is to provide a subscriber station control circuit capable of recording a signal from a subscriber station with a simple configuration and at the same time watching a broadcast of another channel or vice versa.

The subscriber terminal device control circuit of the present invention suitable for the above object comprises: a first terminal and a second terminal respectively connected to an input terminal and an output terminal of a subscriber terminal device (CABLE BOX) provided in a commercial CATV;

A third terminal for inputting a signal multiplexed or scrambled from an antenna / cable;

A fourth terminal connected to the input terminal of the television receiver;

A first divider having an input terminal connected to the third terminal and having a first output terminal and a second output terminal connected to the second terminal;

A second divider having an input terminal connected to the second output terminal of the first divider and having first and second output terminals;

And first, second and third RF switches for controlling the signal flow between the divider, subscriber station, recorder and television receiver. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a subscriber station device control circuit according to the present invention. The subscriber station control circuit shown in FIG. 1 has four connection terminals. The first terminal 2 and the second terminal 4 are respectively connected to the output and input terminals of the subscriber station, the third terminal receives a signal from the antenna / cable and the fourth terminal is connected to the input terminal of the television receiver. Connected. Two dividers 12 and 14 distribute the RF signal input thereto. The recording unit 16 includes a tuner 16-a, a signal processing unit 16-b, and an RF modulator 16-c. The first second and third switchers SW_A (SW_B) SW_C control the signal flow between the divider 14, the subscriber station, the recorder 16 and the television receiver.

The operation of the subscriber station apparatus control circuit according to the configuration of FIG. 1 will be described. The third terminal receives a channel multiplexed or scrambled signal RF from a signal source such as an antenna / cable. The input signal RF is supplied to the first divider 12 through the RF amplifier 10. The input signal RF divided by the first divider 12 is supplied to the second terminal 4 and the second divider 14, respectively. The input signal RF divided by the second divider 14 is supplied to the first switch SW_A and the second switch SW_B, respectively.

2 is a circuit diagram showing a divider. The divider 12, 14 is used to divide the signal input thereto into the same signal and the distribution output decreases in proportion to the number of distribution. The divider shown in Figure 2 uses one wideband transformer. If the leakage magnetic field of this transformer is extremely small, the signal flowing through the input terminal is L ₁ = L ₂ , so it is equally induced to L ₁ and L ₂ , and the power is divided into two, so that the first output and the second output are equal. Will appear on the screen.

The signal flowing out through the second terminal 4 flows into the first terminal 2 through a cable box. The signal transmitted to the subscriber by the CATV operator is scrambled for the purpose of eavesdropping and the like. The subscriber station is a type of decoder that descrambles the scrambled signal into an RF signal that can be viewed with a conventional television receiver.

The descrambled signal PAY flowing through the first terminal 2 is supplied to the first switch SW_A and also to the third switch SW_C.

The first switch SE_A selects an input signal RF from the second distributor 14 or a descrambled signal PAY from the subscriber station and supplies it to the recording unit 16.

The tuner 16-a of the recording unit 16 generates a standard video signal and supplies it to the signal processing unit 16-b. The signal processing unit 16-b modulates a standard video signal into a standard recording signal, for example, a VHS type recording signal, and supplies the same to a recorder (not shown) or demodulates a recording signal from the recorder. c) supplying the same. The RF modulator 16-c forms a standard video signal into a signal VCR suitable for a conventional television receiver, and supplies it to the second switch SW_B.

The second switch SW_B selects the first output signal TV of the second divider 14 or the RF modulated signal VCR of the RF modulator 16-c of the recording unit 16. Supply to ventilation (SW_C).

The third switch SW_C selects the signal TV / VCR from the second switch SW_B or the descrambled signal PAY flowing into the first terminal 2 to the fourth terminal 8. Supply. The signal flowing out of the fourth terminal 8 is supplied to the television receiver.

Table 1 shows the operation according to the selection operation of the switch in the subscriber station control circuit.

As shown in Table 1, when the signals supplied to the recorder and the receiver have different channels, the airborne television signal or the descrambled signal can be selected respectively (four cases on the upper side). In case of having the same channel, the airborne television signal or the descrambled signal can be selected.

As described above, the subscriber station control circuit of the present invention has the advantage of being able to record signals with a VCR and simultaneously watch signals of other channels with a TV with a simple configuration.

In addition, the subscriber station control circuit of the present invention has an advantage that it is easier to use compared to the conventional control circuit because the number of the changers is small.

Claims (2)

1. A recording and reproducing apparatus having a television signal tuner and an RF modulator, comprising: a first terminal and a second terminal respectively connected to an input terminal and an output terminal of a subscriber box provided in a commercial CATV; A third terminal for inputting a channel multiplexed or scrambled signal from the antenna / cable; A fourth terminal connected to the input terminal of the television receiver; A first divider having an input terminal connected to the third terminal and having a first output terminal and a second output terminal connected to the second terminal; A second divider having an input terminal connected to the second output terminal of the first divider and having first and second output terminals; First and second and third switching means, the first switching means being provided to form a conductive path from the tuner to the second output terminal of the second distributor or the first terminal / third switching means. The third switching means is installed to form a conductive path from the first switch or the second switch to the fourth terminal, and the second switching means may include the first output terminal of the second distributor or the like. And a subscriber station apparatus control circuit for forming a conductive path from the RF modulator to the third switching means. The subscriber station apparatus control circuit according to claim 1, wherein the switching means (SW_A) (SW_B) (SW_C) are RF switches.