JP3000898U - TV with integrated video - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a video-integrated television with no screen distortion during conversion playback. A television receiver 1A and a video unit 17 for recording and / or reproducing a video signal and an audio signal of a received television signal on a magnetic tape are provided in one housing, and the video unit has a speed different from that at the time of recording. When the tape is run to reproduce the video signal, the vertical sync pulse of the reproduced video signal is replaced with a pseudo vertical sync pulse having a wider width than this.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a video-integrated television, and more particularly to a video-integrated television capable of still and slow motion playback.

[0002]

[Prior art]

 In a conventional video tape recorder used in a video-integrated type, during variable speed reproduction, the scanning locus of the head becomes oblique with respect to the tape track, so that the number of horizontal sync pulses in one field period is normal. It changes from the value. Therefore, depending on the model of the TV receiver for reproduction, there is a drawback that the vertical synchronization of the reproduction screen is disturbed during variable speed reproduction.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above points, and an object of the present invention is to provide a novel video-integrated television in which the screen is not disturbed during conversion and reproduction.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a television receiver in one housing, and a video unit for recording and / or reproducing a video signal and an audio signal of a received television signal on a magnetic tape, and the video unit. Is to replace the vertical sync pulse of the reproduced video signal with a pseudo vertical sync pulse of a wider width when the video signal is played back by running the tape at a speed different from that during recording. It is a feature.

[0005]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 10 is a tuner section of the television receiver 1A, and the tuner section 10 of the present invention is provided with a tuner for audio multiplexing, and is configured to reproduce sub-audio or stereo broadcasting. The output of the tuner section 10 is led to the video amplification section 12 via the changeover switch 11 so that an image can be displayed on the cathode ray tube 13. The output signal of the tuner section 10 is guided to the audio amplification section 14 to drive the speaker 15.

The input side of the video tape recorder 17 is connected to the output terminal of the tuner unit 10 via the changeover switch 16, and the reproduction output signal of the video tape recorder 17 is input to the video amplification unit 12 via the changeover switch 11. It is configured to be done. Reference numeral 19 is a power supply, and the power supply 19 supplies a required voltage to the tuner unit 10, the video amplification unit 12, the audio amplification unit 14, and the video tape recorder 17.

In the apparatus of the present invention thus constructed, when the terminals 16b and 16c of the changeover switch 16 are connected, the video tape recorder 17 can record the broadcast being received. Further, when the terminals 11b and 11c of the changeover switch 11 are connected, the reproduction output signal of the video tape recorder 17 is guided to the image amplification section 12, and the signal reproduced by the video tape recorder 17 can be seen through the cathode ray tube 13. . Reference numeral 18 is an external signal input terminal for the video tape recorder 17, and 17a is an external output terminal of the video tape recorder 17. By using the external signal input terminal 18 and the external output terminal 17a, a single video tape can be used. It can also be used as a recorder.

Reference numeral 10 a is a terminal for connecting the antenna 19, 10 b is a terminal for connecting the whip antenna 20, and 10 c is a terminal for extracting a signal from the tuner section 10. The tuner unit 10 may be configured as a tuner unit having a front end for giga band for receiving satellite broadcasting.

In FIG. 2, a video signal (luminance signal) is recorded on the tape 1 of the video tape recorder 17 in the state of an FM signal, and one field thereof is sequentially recorded as one oblique magnetic track. In this case, the tracks are formed close to each other or adjacent to each other, and the so-called azimuth angle is different between every other track and every other track.

Reference numerals A and B denote rotary magnetic heads, which have azimuth angles corresponding to the tracks on the tape and have an angular interval of 180 ° with each other and are rotated at a frame frequency by a motor through a rotation axis. Has been.

Then, the tape is slanted around the rotational peripheral surfaces of the heads A and B over an angular range of slightly over 180 °, and is driven at a predetermined speed by the capstan 35 and the pinch roller 36. . Further, 37 is a capstan motor, 38 is a capstan servo circuit, 39 is a system control circuit, and when a mode switch of this control circuit 39 is operated, the tape is made to run at a speed corresponding to the mode. There is.

Then, the video signals (FM signals) are alternately reproduced from the heads A and B every one field period, and the signals are supplied to the switch circuit 43 through the reproduction amplifiers 42A and 42B.

Further, a pulse generation means 51A, 51B is provided on a portion rotatably coupled to the heads A, B, for example, on a rotation axis, and pulses are alternately taken out every half rotation of the heads A, B. This pulse is supplied to the RS flip-flop circuit 33 through the shaping amplifiers 52A and 52B to form a rectangular wave signal S _{1 which} is inverted every field.

In this case, the phase of the signal S ₁ is set so as to be inverted at a time point several horizontal periods before the equalization pulse. Then, this signal S ₁ is supplied to the switch circuit 43 as a control signal.

Therefore, the FM signal is continuously extracted from the switch circuit 43. Then, this FM signal is supplied to the FM demodulation circuit through the limiter 44 to demodulate the image signal S ₂ , and this signal S ₂ is taken out to the terminal 47 through the resistor R ₁ and the buffer amplifier 46.

The present invention is further configured as follows. That is, for example, the signal S ₁ from the RF flip-flop circuit 33 is supplied to the rising and falling trigger type monostable multivibrator 51 and rises due to the inversion of the signal S ₁ , for example, the first A pulse that falls in the vicinity of the equalization pulse is formed, and this pulse is supplied to the falling trigger type monostable Maltese vibrator 52 and falls at the time when the pulse falls, for example, in the vicinity of the last equalization pulse. A rising pulse is formed and this pulse is supplied to the OR circuit 53.

A signal S ₃ which is “1” during normal reproduction and “0” during variable speed reproduction is taken out from the system control circuit 39, and this signal S ₃ is supplied to the OR circuit 53.

Then, when the output of the OR circuit 53 is supplied to the base of the transistor Q ₁ , its emitter is connected to the output side of the resistor R ₁ and its collector is grounded through the capacitor C ₁ . Further, the resistors R ₁ and R ₂ are connected in series between the power supply terminal and the ground, and the connection midpoint is connected to the collector of the transistor Q ₁ . In this way, the clamp circuit 54 is configured. With such a configuration, during normal reproduction, since S ₃ = “1”, the transistor Q ₁ is off, and therefore the video signal S ₂ from the demodulation circuit 45 is directly supplied to the terminal 47 through the amplifier 46. Taken out.

On the other hand, during variable speed reproduction, S ₃ = “0”, but when Pd = “1”, the transistor Q ₁ is off, so that the video signal S ₂ is also taken out to the terminal 47 as it is.

However, when Pd = “0”, the transistor Q₁Is turned on, the signal S₂ Is the transistor Q₁And capacitor C₁Is bypassed through and resistor R ₁ The output side of is resistor R₂, R₃It is clamped to the divided voltage of. Therefore, the resistor R₂ , R₃By selecting the signal S during the period of Pd = “0”.₂Will be clamped to the sync tip level, and this will be taken out to the terminal 47. Therefore, during variable speed reproduction, the video signal S having the pseudo vertical synchronizing pulse corresponding to the pulse Pd₂Will be obtained. Then, the video signal S having such a pseudo vertical synchronizing pulse₂If so, this signal S₂However, even if it is supplied to the TV receiver that divides the sync pulse to form the vertical sync pulse, the vertical sync pulse is formed by integration, and therefore the vertical sync of the playback screen is not disturbed. .

[0021]

[Effect of device]

 According to the present invention, since it is configured as described above, the vertical synchronization of the playback screen is not disturbed even when variable speed playback is performed.

[Brief description of drawings]

FIG. 1 is a block diagram of a video-integrated television of the present invention.

FIG. 2 is a block diagram of an essential part of the present invention.

[Explanation of symbols]

 17 Video Tape Recorder 33 RS Flip-Flop Circuit 51, 52 Monostable Multivibrator 53 OR Circuit 54 Clamp Circuit

Claims (1)

[Scope of utility model registration request] 1. A television receiver is provided in one housing, and a video portion for recording and / or reproducing a video signal and an audio signal of a received television signal on a magnetic tape is provided. When the tape is run at different speeds and the video signal is played back, the vertical sync pulse of the played video signal is replaced with a pseudo vertical sync pulse of a wider width than this. apparatus.