KR890000841B1 - Television watch street keeping circuit - Google Patents

Abstract

The circuit for providing synthetic voice alarm and reducing the brightness of CRT when a person comes close to the television has a concave mirror (22) enclosed in a television case as a distance sensor. When a person comes close to the television, his shadow is detected by the mirror, then the circuit operates to provide an alarm.

Description

TV's viewing distance maintenance circuit

1 is an embodiment of a sensor detecting earth mounted on the television of the present invention.

2 is a flowchart showing the driving relationship of the present invention.

3 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

CP ₁ , CP ₂ : Comparator 3,6: Analog Digital Changer

4,7: counter 5,8: delay unit

OR: Oagate 10: human body detection unit

20: voice signal detection unit 30: channel selection detection unit

40: power supply unit 50: relay circuit

45: micom 50: relay circuit

49: TV audio output section 55: speech synthesis circuit

60: TV brightness control unit 11: relay

S ₁ : relay switch 51: buffer

52: voice signal mixing unit S: speaker

1,2: sensor OP ₁ , OP ₂ : amplifier

FF: Flip-flop MT ₁ , MT ₂ : Monostable Multivibrator

ZD ₁ -ZD ₄ : zener diodes R ₁ , R ₂ . … : resistance

C ₁ , C ₂ , C ₃ . : Capacitor 15: Low Pass Filter

The present invention relates to a viewing distance maintaining circuit of a television which protects the viewer's vision by controlling the brightness of the screen while passing through the audio signal when the viewer approaches a distance that may interfere with vision when watching television. will be.

In general, because the proximity distance that can impair vision when watching television is not known to the viewer, it is the main cause of deterioration of vision when viewing by proximity of the X-ray generated from the TV's CRT.

Therefore, it is necessary to watch TV while keeping a certain distance, and there is a difficulty in maintaining the viewing distance by comparing the voltage applied to the light receiving unit by simply configuring the light emitting unit and the light receiving unit like a general controller (door opener, etc.). Was. In other words, home appliances such as televisions are mobile from the point of sale, and the user's position of use is easily changed. It could not be prevented from malfunctioning due to radio waves generated in the CRT.

SUMMARY OF THE INVENTION An object of the present invention is to provide a viewing distance maintaining circuit of a television that can output a voice warning signal and adjust the brightness of a screen if it interferes with vision at close vision. Provides a sensor detector to prevent malfunctions caused by radio waves generated in the CRT when detecting the viewer's approach, and a human body detecting unit that can accurately detect the low level noise level. It is possible to prevent access deterioration due to viewing of the TV by detecting whether the access is changed during the function conversion (voice control and channel selection) and when accessing the television, which will be described in detail with reference to the accompanying drawings. same.

FIG. 1 shows an embodiment of a sensor detector mounted on a television according to the present invention, in which a concave mirror 22 is installed in a television 21, and then light emitting elements are formed on the top, left, and right sides of the concave mirror to reflect light from the light emitting element. Sensor (1) (2), which is a light-receiving element, is installed on the part to be connected to the connected part. When the viewer approaches, the shadow is formed in the concave mirror 22.

2 is a flowchart showing a driving relationship of the present invention, and FIG. 3 is a circuit diagram of the present invention, in which the sensors 1 and 2 are the same as those of the sensor of FIG. The capacitor C ₁ and C ₂ are configured to be applied to an amplifying unit including resistors R ₂ -R ₄ and amplifiers OP ₁ .

Since this signal amplifies the signal of the fine sensors (1) and (2), since the high frequency noise component is included, the low pass filter (15) composed of the resistors (R ₅ -R ₈ ) and the condenser (C ₃ ) It is configured to output only the detected low-frequency signal, and it is configured to be output by comparing the reference voltage set with the zener diode (ZD ₁ ) and the resistors (R ₁₀ -R ₁₃ ) in the comparator (CP ₁ ), and flip-flop (FF). Configure the human body sensing unit 10 to drive the.

The voice signal detecting unit 20 and the channel selection detecting unit 30 for detecting the tuning of the TV audio signal and the TV channel signal are identically configured to detect the change of the status signal with the voltage generated during the voice signal or channel tuning. The voice signal detection unit 20 is configured such that the output of the analog digital conversion unit 3 drives the counter 4 and is applied as a voice signal, and this voice signal is applied to one terminal (+) of the comparator CP ₁ . The other terminal (-) has a monostable multivibrator (MT) that is addressed to the preceding term (R ₁₅ ) and the condenser (C ₄ ) through a zener diode (ZD ₃ ) configured to compare the state signals applied through the delay unit (5). ₁ ) is configured to be applied to the microcomputer 45 through the OA gate (OR) like the output of the channel selection detection unit 30.

In addition, the relay circuit 50 may be configured by the relay 11 extended to the transistor Q ₁ at one output terminal of the microcomputer 45 to control the TV audio output unit 49 through the relay switch S ₁ . The voice data signal and the output of the voice data memory 53 which are applied to the other output terminal through the buffer 51 are synthesized by the voice signal mixing unit 52 and then passed to the speaker S through the amplifier 54. The speech synthesis circuit 55 is configured to be output, and the TV brightness adjusting unit 60 is speech-composed to the remaining output terminals.

In the drawing, reference numeral 40 denotes a power supply unit configured such that the DC power rectified by the bridge diode through the transformer T can be output as a constant DC power in the constant voltage circuit 13. According to the present invention configured as described above, as shown in FIG. 2, the output of the power supply unit 40 at the time of "start" is applied to each circuit and the microcomputer 45 to operate.

After that, if the viewing distance of the television is kept at a certain distance or more, and the viewer approaches the predetermined distance L, "human detection" is performed. In this case, it is detected by a sensor detector as shown in FIG.

That is, when the viewer 25 approaches the predetermined distance L, the shadow is formed in the concave mirror 22, and when the shadow is formed in the concave mirror 22, the light of the light emitting diodes 23 and 24 is concave mirror ( 22 is less reflected and connected to the sensor (1) (2), so the output of the sensor (1) (2) is a low potential state less than the normal state (maintained over a certain distance and watching TV) Since the signal is applied to one terminal (+) of the amplifier OP ₁ through the DC blocking capacitor C ₁ (C ₂ ), the OP amplifier amplifier OP ₁ is distributed to the resistors R ₂ -R ₄ . An amplifier signal (OP amplifier inversion) is applied to the low pass filter 15.

Here, the sensors 1 and 2 connected to the concave mirror 22 are sensed in double, and the light emitting diodes 23 and 24 mounted on the top and the left and right sides are detected even when the viewer approaches from the side rather than the front side. This prevents malfunction when approaching the television set (which is inversely proportional to the radius of the concave mirror).

의 고전위 상태신호가 인가됨)Since the signal amplified by the fine noise signal includes a lot of noise components, the low pass filter 15 cuts out the high frequency noise component and outputs the detection signal of the sensor which is the low state signal to obtain a stable detection signal. this that can be detected in the (CP ₁₎ detection signal is applied to one terminal (CP ₁₎ of the comparator (CP ₁₎ via the resistor (R _9), the other terminal (-) is a Zener diode (ZD ₁₎ and A constant reference voltage is applied to the resistors R ₁₀ and R ₁₁ so that when a sensing signal of more than the reference voltage is applied, the flip-flop FF is set in the comparator CP ₁ so that the output terminal Q is in a high potential state. The signal is output to the microcomputer 45. (When maintaining a certain distance

High potential signal is applied)

Therefore, depending on the presence or absence of "human detection", when the viewer approaches the receiver, it is necessary to detect the moment passing or to approach the channel for tuning or adjusting the voice. Delay of several seconds during adjustment is not desirable, so after detecting the human body, we detect the presence of channel tuning and voice control. It is necessary to implement "channel tuning and voice control" by detecting that the user is watching television within a certain distance.

In addition, "channel selection and voice control" is performed by the audio signal monitoring unit 20 and the channel selection detection unit 30 shown in FIG. 3, and the analog digital converter according to the amount that changes when the viewer changes the voice (touch type). In step 3), the signal is converted into a digital state signal and applied to the counter 4 so that the counter value is output as a voice signal according to the voltage (voice change amount) applied from the counter 4. (Authorized in TV)

That is, the present invention only needs to detect whether there is a voice signal that is changed (positive or negative) in the set voice signal. The value of the voice signal being changed is changed at one terminal (+) of the comparator CP ₂ . The voice signal is applied to the other terminal (-) just before the delay unit 5.

Therefore, when the value of the sound ray signal is changed, the comparator CP ₂ has a constant positive or negative output value, and the delay unit 5 is applied when the fixed output is applied as a voice signal (the sound change amount stops) at the counter 4. ) is the output of the state signal and a comparator (CP _2), a comparator (CP ₂₎ to equal the value of the status signal which is applied to one terminal (+) of which is presented through blocks.

)가 발생되고 음성신호가 감소되고 있는 동안은 비교기(CP₂)가 차단 상태에서 저전위 상태 신호를 출력시킨 후 다시 차단 상태가 되는 펄스(

)가 발생하게 되는 것으로 단안정 멀티바이브레이터(MT₁)에서 라이징에지시(risingedge)시 트리거시키면 음성 변화에 따른 출력이 음성신호 감지부(20)에서 발생하게 되고 채널선국시에는 채널선택 감지부(30)에서 동일한 출력을 얻을 수가 있게 된다.In this case, when the voice signal is increased, the comparator CP ₂ outputs a high-potential state signal in a cutoff state, and then a pulse which becomes a cutoff state again.

) Is generated and the voice signal is being reduced, the comparator (CP ₂ ) outputs the low-potential signal in the cutoff state and then goes back to the cutoff state (

When the monostable multivibrator (MT ₁ ) is triggered at the rising edge (rising edge), the output according to the voice change is generated in the voice signal detection unit 20, and the channel selection detection unit ( In 30, the same output can be obtained.

Here, the Zener diodes ZD ₃ and ZD ₄ are configured to prevent the overvoltage from being applied to the monostable multivibrator, and the resistance of the monostable multivibrator MT ₁ is greater than the time when the counter 4 is counted. R ₁₅ ) and the pulse (time constant) triggered as the condenser C ₄ are increased to prevent the generation of a large number of pulse outputs of the monostable multivibrator MT ₁ when the counter changes.

In this way, the presence or absence of channel control and voice control is applied to the microcomputer 45 to prevent malfunctions caused by simple changes in the function of the television during normal viewing (maintaining a certain distance). When it detects 45, "TV voice cutoff, voice synthesis, and brightness control" are performed to drive transistor Q ₁ to one output terminal of the microcomputer 45 so that the relay 11 is excited so that the relay switch S ₁ ) is switched and the TV audio output unit 49 is cut off to cut off the audio signal. When the voice synthesis circuit 55 is driven to the other output terminal of the microcomputer 45, the microcomputer 45 is applied through the buffer 51. The audio status signal and the audio data output from the memory ROM 53 are synthesized by the audio signal mixing unit 52 and output to the spurs S through the amplifier 54. A warning message is output to maintain the distance over a certain distance, and the remaining output terminal of the microcomputer 45 controls the TV brightness adjusting unit 60 to make the CRT overall dark so that the viewer can maintain a certain distance when watching TV. do.

After setting the number of repetitions after "second delay", if the same operation is performed as described above (about 3 times), if it does not maintain more than a certain distance with the TV receiver, the "end" operation is performed after the "second delay". Although not shown here, the power supply switch of the television is opened.

As described above, according to the present invention, the human body detecting unit 10 detects the approach of the viewer within the viewing distance of the television, and then detects the audio signal to determine whether the approach is for changing the function of the television or approaching the television. After detecting by the unit 20 and the channel selection detection unit 30, the TV audio output unit 4 9, the voice synthesis circuit 55, and the TV brightness control unit 60 are sequentially executed in the program order set in the microcomputer 45. It is possible to adjust the brightness of the CRT and then to control the brightness of the CRT after TV sound cutoff, and to provide a viewing distance maintenance circuit of a TV that can install a high contrast device to generate a warning sound as needed.

Claims (3)

The light emitting diodes 23 and 24 and the concave mirror 22 are mounted in the television 21, and the detection signals of the light receiving sensors 1 and 2 that are reflected by the concave mirror 22 and connected to the amplifier OP ₁ . To control the flip-flop (FF) in the comparator (CP ₁ ) through the low pass filter 15 in the human body sensing unit 10 and the output of the analog digital converter 3 drives the counter (4) The voice signal through the (5) and the comparator (CP ₂ ) to be configured to drive the monostable multivibrator (MT ₁ ) through the zener diode (ZD ₃ ) to the voice signal detector 20 and the channel selection detector ( 30 is driven and applied to the microcomputer 45 through the oragate OR, and the TV audio output unit 49, the audio synthesizing circuit 55, and the TV connected to the relay circuit 50 in the microcomputer 45 are configured. A viewing distance maintaining circuit for a television, which is configured to control the brightness adjusting unit 60. The method of claim 1, wherein the output of the area pass filter 15 is applied to one terminal (+) of the comparator (CP ₁ ) of the human body sensing unit 10 through the resistor (R ₉ ) and the other terminal (-). A television viewing distance maintaining circuit configured to apply a reference voltage distributed to a zener diode (ZD ₁ ) and a resistor (R ₁₀ ) (R ₁₁ ) so that an operating level of the sensor (1) (2) is set. The monolithic multivibrator MT ₁ (MT ₂ ) of the voice signal detecting unit 20 and the channel selection detecting unit 30 includes a resistor R ₁₅ (R ₁₆ ) and a capacitor C ₄ . A viewing distance maintenance circuit of a television in which a pulse width composed of (C ₅ ) is made larger than the count pulse width of the counters (4) and (7).

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