JPH0731648Y2 - Additional information display control system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a video equipment system including a television receiver, a VTR and the like having an OSD circuit for outputting additional information on a screen.

2. Description of the Related Art In recent years, the functions of video equipment such as television receivers and video tape recorders have become rich, and the conventional method using individual indicators such as LEDs complicates the display mechanism and is not sufficiently explained. There was a problem that it was difficult to understand because it was not there. Therefore, superimpose additional information related to mode display and function explanation on the video signal, and output them on the screen (called on-screen display = OSD).
Methods are being widely adopted.

Problems to be Solved by the Invention In a system in which a plurality of video devices equipped with such an OSD circuit are connected, each device independently outputs such additional information, so that two or more additional information are displayed on the screen. It will be displayed superimposed. For example, when a satellite broadcast tuner is connected to the television receiver, the OSD of the reception status of the satellite broadcast tuner and the OSD of the reception channel number in the television receiver are superimposed on the video signal,
As shown in FIG. 3A, both OSDs overlap each other on the screen, which makes it difficult to read any information.

An object of the present invention is to solve such a problem and to provide a system for appropriately controlling the OSD display on the screen even when a plurality of video devices having an OSD circuit are connected.

In order to achieve the above object, in the additional information display control system according to the present invention, an OSD circuit for superimposing additional information on a video signal is provided, and a television signal including a video signal and an audio signal is externally output. In a system including a TV signal output device that outputs to a device and a video output device that also has an OSD circuit and that visually outputs a video signal from the TV signal output device, a video signal is output to the TV signal output device. When superimposing additional information on the signal, a means for changing the amplitude of the carrier for FM modulation of the audio signal is provided, and the video output device changes the OSD output according to the change in the amplitude of the carrier of the audio signal in the received TV signal. It is characterized in that means for performing is provided.

Action On the television signal output device side, when the additional information is superimposed on the video signal (OSD display is performed), the amplitude (or the state of change of the amplitude) of the FM modulation carrier wave of the audio signal is changed.
In this case, the amplitude (or the state of the amplitude change) may be simply changed between the period in which the OSD is displayed and the period in which the OSD is not displayed, or the area on the screen where the OSD is to be displayed (for example, upper and lower areas). ), The amplitude (or how the amplitude changes) may be changed. Television signals including these video signals and audio signals are output to the outside.

The video output device that has received this television signal separates the audio signal carrier therein and detects its amplitude. Then, the OSD output of the video output device itself is changed according to the change of the amplitude (or the state of the change of the amplitude) of the audio signal carrier. For example, in the case of the former example (the amplitude is changed between the period in which the OSD display is performed and the period in which the OSD display is not performed), when the OSD display is performed on the TV signal output device side, the OSD output is completely output on the video output device side. To stop, or
In the latter example (changing the amplitude according to the OSD display position on the screen), the OSD is output at a position different from the OSD display position on the TV signal output device side. This prevents the confusion of two or more OSDs overlapping on the screen.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows a video tape recorder (V
FIG. 1 is a block configuration diagram of a system in which a TR) 10 and a television receiver (TV) 12 are connected.

On the VTR10, the video signal (Video) 16 reproduced from the tape
After passing through the OSD circuit 18, is input to the mixer circuit (MIX) 20 of the RF modulator unit 14. In the OSD circuit 18, a microcomputer (μ-COM) 40 that controls the VTR 10 adds video information such as a tape counter and a program reservation table to the video signal 16 reproduced from the tape, if necessary. The audio signal (Audio) 26 reproduced from the tape is input to the FM modulation circuit 28 of the RF modulator unit 14. In the RF modulator section 14, the video signal and FM reproduced by the mixer circuit 20
The modulated audio signals are mixed, converted into an RF signal by the RF converter 22, and output to the TV 12.

In the FM modulation circuit 28, the audio signal is generated by the oscillator (4.5MHz-Osc) 54
The FM modulation is performed by the 4.5 MHz carrier generated by the above. At this time, two kinds of carriers, that is, the carrier A having the amplitude of the normal level and the carrier B whose amplitude is expanded by the amplifier 50 are selectively used according to the instruction of the microcomputer 40. The switch S1 (42) switches between these two types of carrier waves A and B. Microcomputer 40 is OSD
When outputting the OSD information to the circuit 18, a pulse-shaped switch changeover signal (Fig. 2 (a)) with a constant cycle is selected.
It is sent to S1 (42), and the amplitude of the sound carrier wave is changed in pulse form. On the other hand, when the OSD output is not performed, the changeover switch S1 (42) is held on the A side, and the carrier A having a constant amplitude is sent to the FM modulation circuit 28. F when OSD display appears
The waveform of the sound carrier wave (carrier) sent to the M modulation circuit 28 is shown in FIG.

In the TV12, the RF composite signal generated in this way is received by the tuner (Tuner) 24, and the intermediate frequency detection circuit (PIF DE
T) 30 separates video signal and audio signal. Of these, the video signal is output to the screen after passing through the video amplifier circuit (Video) 32 and the OSD circuit 56. In the OSD circuit 56 on the TV 12 side as well, as in the VTR 10, the microcomputer (μ-COM) 52 superimposes information such as a channel number on the video signal as necessary.

One of the voice signals in the form of FIG. 2 (b) separated by the detection circuit 30 is a voice bandpass filter (Soun) as usual.
After passing through d-BP) 34 and limiter (Limiter) 36, a detection circuit (Sound-DT) 38 outputs an acoustic signal. In the present embodiment, the OSD prohibition pulse detection circuit 44 further compares the amplitude of the subcarrier in FIG. 2B with a predetermined threshold value V _TH to detect the presence or absence of a pulse. Here, the threshold value V _TH is the R of the output side device (VTR) 10.
The amplitude of the two types of audio carriers A and B used in the F modulator unit 14 is set to an intermediate value. The output of the detection circuit 44 is sampled and held by the sample and hold circuit 46. When a pulse is detected, a pulse that becomes High during the OSD display period on the VTR side (this pulse is shown in FIG. 2D). When it is detected, the OSD output is prohibited on the TV side, so an OSD prohibition pulse) is obtained. This OSD prohibition pulse (FIG. 2 (e)) is output from the OSD prohibition pulse generator 48 to the OSD circuit 56, and the OSD circuit 56 does not display the OSD while this pulse is being input. That is, while the video signal with OSD display is being input from the VTR10, the TV
On the side, the OSD display is not performed, and the OSD displays are prevented from overlapping each other on the screen (Fig. 3 (b)).

In the above example, while the OSD display is being performed on the VTR side, the
The OSD display was prohibited on the front, but the screen was divided appropriately in the upper left, upper right, lower left, and lower right beforehand, and the switch switching pulse (Fig. 2 (a)) pulse depending on the area where the OSD display is performed. The width and the like may be changed. In this case,
When performing OSD display on the receiving side (TV side), the transmitting side (VTR
By displaying in a different area from (on the side), the OSD displays do not overlap with each other, and the necessary information from both devices can be obtained without omission.

Effect of the Invention As described above, according to the present invention, in a system including a plurality of video devices having an OSD circuit, OSDs (on-screen displays) from the respective devices do not overlap each other on the screen and are easy to read. OSD display is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a VTR-TV connection system which is an embodiment of the present invention, FIG. 2 is a timing chart showing signals at each stage of the system of the embodiment, and FIGS. 3 (a) and 3 (b).
Is the OSD on the screen by the conventional system and the example system
It is a figure which compares the example of a display.

Claims (1)

[Scope of utility model registration request] 1. An OSD circuit for superimposing additional information on a video signal, a TV signal output device for outputting a TV signal including a video signal and an audio signal to an external device, and an OSD circuit for the TV signal output device. In a system that includes a video output device that visually outputs a video signal from the device, change the amplitude of the carrier wave for audio signal FM modulation when superimposing additional information on the video signal to the TV signal output device. An additional information display control system, characterized in that means is provided, and the video output device is provided with means for changing the OSD output in accordance with a change in the amplitude of the audio signal carrier in the received television signal.