KR920004943Y1 - Viewing distance limit tv receiver - Google Patents

Abstract

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Description

Voice alarm for TV receiver with limited viewing distance

1 is a block diagram of the device of the present invention.

2 is a circuit diagram of the device of the present invention.

3a is a base input waveform diagram of the transistor Q2 in the inventive device, (b) is an emitter output waveform diagram of the transistor Q2 in the inventive device, and (c) is a base of the transistor Q3 in the inventive device. The input waveform diagram (d) is the collector output waveform diagram of transistor Q3 in the inventive device, (e) the output waveform diagram of the end gate 8 in the inventive device, and (f) is the voice alarm in the inventive device. Waveform diagram of the signal.

* Explanation of symbols for main parts of the drawings

3: pulse selector 4: discrimination unit

5: first delay unit 6: control unit

7: second delay unit 8: AND gate

9: Voice memory for alarm 10: Switching unit

The present invention relates to a voice alarm device for a viewing distance limited TV receiver, and more particularly, to a voice alarm device in which an alarm sound such as "get out" is stored, and the screen turns off after a double delay.

In the related art, as shown in FIG. 4, the viewing distance detecting signal reflected by the viewer after being emitted by the transmitting unit 51 is received by the receiving unit 52 to receive the viewing distance detecting signal from the comparing unit 53. After the determination, the delay unit 54 generates an alarm sound composed of the oscillation sound immediately after a predetermined time delay from the oscillator 55 to the separate speaker 57 and simultaneously turns off the screen of the TV receiver in the luminance controller 56. However, this conventional configuration is because the speaker 57 of the oscillator 55 is installed separately even though the speaker is already installed in the TV receiver, so there are problems such as an increase in parts and securing an installation area, as well as an alarm. There was a drawback of giving a psychological pressure to the viewer by generating sound.

The present invention provides a softer alarm to the user by broadcasting a voice output of "step out" when the viewer enters within the viewing limit distance by installing a voice memory that stores the alarm sound to solve this conventional disadvantage. At the same time, the object of the present invention is to provide a voice alarm device that does not need to install a separate speaker by generating a voice alarm through the speaker already installed in the TV receiver, the configuration and effect of the present invention with reference to the accompanying drawings When described as follows.

1 and 2, the construction of the present invention includes a viewing distance detecting signal generator (A), a receiving amplifier (2), a receiving pulse selector (3), a discriminator (4), and a first delay unit ( 5) and a viewing distance limiting device composed of a control unit 6, wherein the output of the discriminating unit 4 is composed of a diode D2, a transistor Q3, a delay capacitor C2, and a resistor R6-R9. And the output of the second delay unit 7 to the entrance input of the AND gate 8 composed of the transistors Q4 and Q5 and the voice memory 9 for alarm. The other input of 8) is connected to the output of the first delay unit 5, and the output of the AND gate 8 is a reset terminal of the voice memory 9 for alarm. And a transistor (Q6) and diodes (D4, D5) connected to the control terminal of the switching unit 10, the output of the switching unit 10 is connected to the audio output terminal (11). The effect of the operation will be described with reference to FIGS. 3A to 3F. When there is no person within the viewing limit distance in front of the screen of the TV receiver, the output of the determination unit 4 becomes low and the diode D1 is turned on. Since the voltage applied through becomes "high", the capacitor C1 in the first delay unit 5 is charged. In this case, the resistor R1 has a very small resistance value so that the charging time is very short.

Therefore, when there is no person within the viewing limitation distance from the front of the TV receiver, the base potential of the transistor Q2 is kept high as shown in part A of FIG. 3A.

That is, part A is a state when there is no person within a certain distance in front of the TV.

In this state, if a person enters within the parental control distance, the output of the discriminating unit 4 becomes "high" so that the transistor Q1 is kept on, and thus the potential of the capacitor C1 is mainly discharged through the resistor R2. Done.

This discharge curve is as shown in part B of FIG. 3A.

When discharged to some extent (ie, at the beginning of the B '' 'portion), the transistor Q2 is turned off as shown in the 3b diagram so that one input of the AND gate 8 is in a "low" state and the second delay portion 7 The potential charged in the capacitor C2 is discharged through the resistor R6 to turn on the PNP type transistor Q3 earlier than the off time of the transistor Q2 in FIG. 3A as shown in part B of FIG. 3B. In other words, the other input of the AND gate 8 is in the "high" state.

Accordingly, the output of the transistor Q2 (Fig. 3b) is input to one input of the AND gate 8, and the output of the transistor Q3 (Fig. 3d) is input to the other input.

Therefore, the output of the AND gate 8 is the same as the 3e diagram, and as shown in FIG. 3f, the alarm voice memory 9 has the " high " only while the output of the AND gate 8 is " high " Generates a voice signal.

That is, in FIG. 3, part B has a person within a predetermined distance in front of the TV, where part B 'corresponds to a first delay time, part B' is an alarm sound generating time, part B '' is a time when the TV screen disappears.

However, since the output of the AND gate 8 is applied to the base of the PNP transistor Q6 through the diode D4 in the switching unit 10, the TV audio signal is output while the output of the AND gate 8 is "high". It is turned off and the output signal of the voice memory 9 for alarm is applied to the voice output stage 11, so that the speaker of the TV receiver produces a "beep off" alarm sound.

After that, if a person deviates within a certain distance of the front of the TV, as shown in FIG.

As described above, according to the present invention, before the TV screen is blocked, the TV voice signal is cut off and an alarm sound is generated so that the viewer can be warned smoothly without creating anxiety. In particular, the speaker built in the TV receiver is used. Therefore, if you do not install a separate speaker and at the same time the TV screen is blocked it can be seen by the TV sound output that the TV receiver is in operation.

Claims (1)

A second delay unit 7 for determining a start time of the output of the alarm sound signal by delaying the output of the determination unit 4 for outputting a signal for determining whether a person exists within the TV viewing restriction distance for a predetermined time; The first delay unit 5 which determines the output end time of the alarm audio signal by delaying the output of the unit 4 by a predetermined time, and the alarm sound signal of the voice memory 9 according to the output of the delay unit 5 and 7. And gate (8) performing switching control of the output unit and the switching unit 10, and when the output of the alarm audio signal is controlled by the output gate of the gate 8 and shuts off the TV voice signal and outputs the alarm audio signal to the audio output stage A voice alarm device for a viewing distance limiting TV receiver comprising a switching unit 10 which is supplied to 11 to output to a TV speaker.