CN101221241A - Television watching alarm system and method - Google Patents

Abstract

The invention discloses a television watching alarm system and a method, wherein the system comprises an alarm device, a detection device, a signal processing device and a controller; the detection device respectively scans different areas under the control of the controller and sends scanning results to the signal processing device; the signal processing device processes the scanning result and then sends the processed scanning result to the controller; and the controller judges according to the scanning result and indicates the alarm device to alarm when finding that an obstacle exists in the forbidden zone. The method comprises the following steps: dividing a detection area; scanning different areas in sequence; judging whether an obstacle exists in the forbidden zone according to the scanning result; and if so, alarming. By adopting the technical scheme of the invention, the bad watching modes including bad watching visual angle can be alarmed, so that the bad habit of watching TV can be more comprehensively prevented, and the eyesight of audiences is protected.

Description

A kind of TV watch alarm system and method

technical field

The invention relates to an alarm system and method, in particular to a TV watching alarm system and method.

Background technique

Ultrasonic detection device is used in TV to protect the eyesight of viewers. The prior art patent CN01261157, the application date is September 10, 2001, discloses a TV eye protection warning device, which can not only watch TV at close range The viewer can give a timely alarm prompt, and can turn off the TV set if the viewer still does not adjust the distance after the alarm is issued. It specifically discloses the following technical features: in the insulating casing, it is composed of an integrated ultrasonic transmitting head and ultrasonic receiving head, alarm horn, indicator light, power switch, and TV socket. On the top of the TV set, when watching TV, if the viewer is close to 1 meter from the TV, the health of the eyes will be affected, and the device will immediately send out an alarm prompt to keep the viewer away from the TV.

However, the existing TV viewing reminding device is only a reminding device for watching at a close distance, and in actual viewing, a poor viewing angle will also have a bad impact on people's vision, and there is currently a lack of reminders for poor viewing angles. installation.

Contents of the invention

In view of the above shortcomings, the present invention provides a TV viewing alarm system and method, which can warn viewers who watch TV at a close distance or at an unfavorable angle, thereby achieving the purpose of protecting the viewers' eyesight.

The technical scheme adopted in the present invention is:

A TV watching alarm system, including an alarm device, a detection device and a signal processing device, is characterized in that it also includes a controller, wherein:

The detection device scans different areas under the control of the controller and sends the scanning results to the signal processing device; the areas at least include an area A with a suitable TV viewing angle and an area B with an inappropriate viewing TV angle;

The signal processing device processes the scan result and sends it to the controller;

A minimum viewing distance is stored in the controller; the controller judges whether there is an obstacle in the scanned area according to the scanning result; , the controller instructs the alarm device to alarm.

Further, the signal processing device is a gain controller;

When the detection device scans, it first emits a detection wave, and when receiving the reflected wave, generates a corresponding signal and sends it to the gain controller;

The gain controller provides the controller with gain after gaining the signal output by the detection device according to the gain coefficient stored in the controller;

When scanning area B, if the controller receives the signal indicating that the reflected wave is received, the alarm device will be instructed to alarm; when scanning area A, if the controller receives the signal indicating that the reflected wave is received The signal calculates the distance between the obstacle and the TV, and when the distance is less than the minimum viewing distance, it instructs the alarm device to give an alarm.

Further, the detection device includes three ultrasonic transmitters and an ultrasonic receiver; by adjusting the reflection equipment in the ultrasonic transmitter to set the angle range of the ultrasonic emission, so that the ultrasonic waves emitted by the three ultrasonic transmitters cover the area respectively A, the left half of area B and the right half of area B; the receiving range of the ultrasonic receiver includes area A and area B;

Under the control of the controller, the detection device turns on the emitter corresponding to the area to be scanned and turns off other emitters, so as to respectively emit ultrasonic waves to different areas.

Further, the detection device includes an ultrasonic transmitter and an ultrasonic receiver; the ultrasonic transmitter transmits ultrasonic waves to area A and area B respectively under the control of the controller; the receiving range of the ultrasonic receiver includes Area A and Area B.

Further, the system also includes an input device;

The oscillation period of the ultrasonic transmitter is divided into different time periods; the input device is used to divide the scanned area into area A and area B by setting the length of the time periods.

Further, the detection device also includes an infrared remote sensor; the controller first controls the infrared remote sensor to perform infrared remote sensing on the scanned obstacle before instructing the alarm device to alarm, and when the obstacle is a person, the controller indicates The alarm device gives an alarm.

Further, the system also includes an input device, which is used to set the minimum viewing distance stored in the controller, and is also used to set the ultrasonic scanning distance; the input device can set the gain coefficient stored in the controller or ultrasonic detection The threshold sets the ultrasonic scanning distance.

Further, the system also includes an input device for setting the infrared detection distance; the input device sets the infrared detection distance by setting the gain coefficient or the infrared detection threshold stored in the controller.

Further, the alarm device also includes a timer to count the time of this power-on; a predetermined viewing time length is stored in the controller; when the timing in the timer exceeds the viewing time length, the control The indicator instructs the alarm device to alarm.

The present invention also provides a TV watching alarm method, characterized in that it comprises the following steps:

(a) The detection area is divided into a suitable area A for viewing a TV angle, and an inappropriate area B for viewing a TV angle; the minimum viewing distance and the scanning distance are set; in the area A, the part with the TV distance less than the minimum viewing distance is area C;

(b) Scanning different areas sequentially;

(c) Judging whether there is an obstacle in the area C and area B according to the scanning results; if there is an obstacle in at least one area, then perform step (d); if there is no obstacle, then return to step (b);

(d) report to the police; return to (b).

Further, in the step (a), the infrared detection distance is set; in the step (c), when it is judged that there is an obstacle, infrared remote sensing is performed to judge whether the obstacle is a person, and if so, step (d) is executed; otherwise Return to step (b).

Further, in the step (b), the specific steps of scanning are: transmitting ultrasonic waves; generating a corresponding signal if a reflected wave is received.

Further, in the step (c):

The method of judging whether there is an obstacle in area B is: if a reflected wave is received when scanning area B, there is an obstacle in area B;

The method of judging whether there is an obstacle in the area C is: if the reflected wave is received when scanning the area C, the distance between the obstacle and the TV is calculated according to the time of transmitting the ultrasonic wave and receiving the reflected wave, if the distance is less than the minimum viewing distance, then There are obstacles in area C.

After adopting the technical solution of the present invention, in the process of watching TV, viewers can find their unfavorable viewing methods at any time - including watching at close range, watching at an unsuitable angle and watching for a long time, and remind the viewer or watch after finding out Compulsory interruption of TV programs, so that the bad habit of watching TV can be prevented more comprehensively, so as to protect the eyesight of the audience.

Description of drawings

Fig. 1 is the schematic diagram of TV viewing alarm system among the present invention;

Fig. 2 is a schematic diagram of area division in the present invention;

Fig. 3 is the flow chart of TV watching alarm method among the present invention;

Fig. 4 is the schematic diagram of distance parameter in the present invention;

Fig. 5 is a flowchart of Embodiment 1 of the present invention;

Fig. 6 is a flowchart of Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, a kind of TV watching warning system, this warning system can be installed in TV inside or outside TV, comprises at least one detection device 108, gain controller 106, controller 102 and at least one alarm device 104; Can also comprise input device 110.

The detection device 108 divides the detection area, and scans each area under the control of the controller 102 to sense the existence of obstacles therein. The signal is sent to gain controller 106 .

The detection device 108 includes three ultrasonic generators and an ultrasonic receiver. As shown in Figure 2, the three ultrasonic transmitters 1, 2, and 3 are placed in such a way that the emitted ultrasonic waves cover three different areas—the front, left, and right fronts centered on the TV screen. A fan-shaped area, so that the detection area is divided into three blocks, which are area one in Figure 2 where TV can be watched at a suitable angle, and restricted areas two and three that can only watch TV at an inappropriate angle of view. In practical applications, the three ultrasonic transmitters can be placed horizontally or stacked together, as long as they can emit ultrasonic waves to different areas.

Ultrasonic generator 1 emits ultrasonic waves to area 1, ultrasonic transmitter 2 emits ultrasonic waves to restricted area 2 that is likely to cause strabismus, ultrasonic transmitter 3 emits ultrasonic waves to restricted area 3 that is likely to cause strabismus, and ultrasonic receiver 4 is placed on the ultrasonic wave above or below the transmitter. Under the control of the controller 102 , the detection device 108 scans and detects obstacles in different areas by turning on the emitter corresponding to the area to be scanned and turning off other emitters. The user can limit the angle of ultrasonic emission by adjusting the reflector in the ultrasonic transmitter, thereby adjusting the angle range of the area that the ultrasonic transmitter can detect, so that the ultrasonic waves emitted by the three ultrasonic transmitters cover different areas respectively; then use Adjust the gain controller 106 or adjust the ultrasonic detection threshold to set the scanning distance—that is, the range of the area that can be detected by the ultrasonic transmitter, that is, its effective working range.

Referring to Fig. 2, we can set area 1 as the area scanned for the first time, set a minimum viewing distance, and then calculate the distance between the obstacle and the detection device 108 according to the time difference between the time of receiving the reflected wave and the time of emission, Since the TV viewing alarm system is installed inside or outside the TV, this distance is the distance from the TV; compare whether the distance is less than the preset minimum viewing distance, and give a warning if it is within the distance; The restricted area 3 is the second and third scanning emission areas, as long as obstacles are detected in these two areas, a warning will be given.

The detection device 108 may also have another implementation. In this implementation, the detection device 108 includes an ultrasonic receiver and a unique ultrasonic generator, and the controller 102 controls the ultrasonic generator at a fixed angular velocity Swing horizontally to make it emit ultrasonic waves to different areas, and the ultrasonic receiver can receive the reflected waves of each area, so that the detection device 108 can scan and inspect each area block by block. In this implementation, each swing cycle can be divided into three different time periods, and the angles of the three areas are set by setting the lengths of the three time periods, so that the detection area is divided into: Area 1 , restricted areas two and three.

In practical applications, the detecting device 108 may be any device capable of measuring distance by using the time difference of the transmitted wave and reflected wave, such as an infrared transmitting and receiving device.

The detection device 108 may also include a human body infrared remote sensor, which receives infrared rays under the control of the controller 102 and generates an electrical signal that is sent to the controller 102 through the gain controller 106, and the controller 102 compares the signal and the infrared detection threshold to more accurately detect whether the obstacle detected by the ultrasonic wave is a person; the infrared detection distance of the infrared remote sensor can be preset to be equal to the scanning distance. Because the intensity of the infrared light emitted by the human body is relatively fixed, the light intensity that can be captured by the infrared remote sensor is also relatively fixed; if the infrared detection threshold in the controller 102 is fixed, then it is adjusted by the controller 102 The gain coefficient of the gain controller 106 is relatively equal to adjusting the sensitivity of the infrared remote sensor, so that the required infrared detection distance can be set as required.

The gain controller 106 receives the control of the controller 102, and according to the gain coefficient stored in the controller 102, the electrical signal provided by the detection device 108 and the infrared remote sensor is subjected to gain control and then provided to the controller 102; the gain controller device 106 is digitally controllable.

Controller 102 judges whether there is an obstacle in the restricted area according to the signal provided by gain controller 106; Instruct alarm device 104 to report to the police after finding obstacle; The part of the range of the set minimum viewing distance is the restricted zone 1 in Figure 2. The controller 102 is a microcontroller (MCU) SPF series single-chip microcomputer of Sunplus Technology Co., Ltd. Of course, the microcontroller can also be replaced by other single-chip microcomputers or embedded chips that can realize similar functions.

Described alarm device 104, alarms under the control of controller 102; This alarm device 104 can be a voice prompting device, such as when detecting people in the restricted area, carry out voice broadcast prompt; It can also be a display device, such as on a TV Display prompts on the screen, that is, adopt OSD (superimposed display on the normal display screen); it can also be a control device, such as forcing the TV to stand by for one minute, or cutting off the antenna and power input of the TV; or several methods The combination. This warning device 104 also can comprise a RTC (real time clock), and this RTC receives the control of controller 102, counts how much time has been turned on, and shows the already turned on time by OSD; When controller 102 judges the time of this turn on When the predetermined viewing time has been exceeded, the alarm device 104 will be reminded in a timely manner by means of voice, OSD, or the like.

The input device 110 is connected with the controller 102, and the distance parameters can be set through the input device 110, including the ultrasonic scanning distance, the minimum viewing distance and the infrared detection distance, and the viewing time length can also be set, and the set parameters are provided to controller 102 . In practical applications, the input device 110 can be realized by a selection switch. For example, the user can select an appropriate scanning distance according to the size of his room or the layout of the house; the user can also input the scanning range through the OSD. The ultrasonic detection threshold and the infrared detection threshold are preset in the controller 102, and the input device 110 converts the ultrasonic scanning distance to be set and the infrared detection distance into the corresponding gain coefficient of the gain controller 106, And provide it to the controller 102 to control the gain controller 106, which is a method of setting the distance in disguise. Of course, the two distances can also be adjusted separately by setting the two thresholds in the controller. In addition, when there is only one ultrasonic transmitter in the detection device 108, the length of three time periods can be set through the input device 110 to divide the scanning area.

The present invention also provides a TV viewing alarm method, as shown in Figure 3, comprising:

The first step is to initialize the system, including dividing the detection area, and may also include setting distance parameters.

Wherein, the division detection area is to divide the area around the TV set into several parts as shown in Figure 2; Figure 2 is a cross-sectional view parallel to the ground after the area division, wherein Area 1 is composed of a safe area and a restricted area , with the center line of the TV screen perpendicular to the ground as the axis, the radius as the scanning distance, and a non-zero included angle as a fan-shaped columnar area; the restricted area 2 is the left side of area 1 with the above center line as the axis, and the radius is arbitrary , you can see the columnar area of the TV screen with a fan-shaped cross section, the restricted area three is the area-the right side takes the above-mentioned center line as the axis, and can see the columnar area with a fan-shaped cross-section of the TV screen.

The included angle of the first area can be preset or adjusted by the user through the input device;

When the detection device is composed of three ultrasonic generators and an ultrasonic receiver, it can be adjusted by adjusting the reflection equipment to limit the emission angle; when the detection device is realized by swinging with a single ultrasonic detection device, each The swing cycle is divided into three different time periods, and the included angles of the three regions are set by setting the lengths of the three time periods, thereby dividing the three regions.

The included angle is preset according to the viewing angle: the included angle of area 1 is set to an angle range suitable for watching TV; restricted area 2 and restricted area 3 can be but not limited to be symmetrical and equal.

The distance parameters include minimum viewing distance, scanning distance, and infrared remote sensing detection distance, as shown in Figure 4:

Minimum viewing distance, the distance set to prevent myopia, when the viewer is less than this distance from the TV, it will alarm;

Scanning distance, the effective working range of the ultrasonic device, the receiving device can only receive the signal generated by the reflected wave when the obstacle is within the scanning distance, and the signal is greater than the ultrasonic threshold after gain.

Infrared detection distance, the effective working range of the infrared remote sensor, if someone watches within this distance, the signal detected by the infrared remote sensor will be greater than the infrared detection threshold, and the infrared detection can be set by setting the infrared detection threshold or gain coefficient Distance, which can be set equal to the scan distance.

By setting the minimum viewing distance, it is also possible to divide the forbidden zone 1 in the area 1: take the center line of the TV screen perpendicular to the ground as the axis, and take the set minimum viewing distance as a section with a non-zero radius as a sector. the columnar area;

The distance parameter can be preset or adjusted by the user through the input device;

The distance parameters and angles in the aforementioned system can be pre-set as follows: the included angle of area 1 is 120 degrees, the included angles of restricted area 2 and restricted area 3 are each 30 degrees; the scanning distance is 5m, the minimum viewing distance is 1.5m, and the infrared remote sensor detects The distance is set to be equal to the scanning distance, which is 5m.

In the second step, scanning, the controller controls the detection device to scan all areas to obtain information;

Wherein, the scanning refers to that the controller controls the detection device to sequentially detect area one, restricted area two and restricted area three to obtain information; the obtained information is the time when the detection device emits ultrasonic waves or other waves for detection; if there is a reflected wave, then It also includes the time when the reflected wave was received, and the signal used to indicate that the reflected wave was received.

The third step is to judge. The controller judges whether there are obstacles in the restricted area according to the information obtained by scanning. The specific judgment method is: if the reflected wave is received when scanning the restricted area Once the reflected wave is received in the area, the distance between the obstacle and the TV is calculated according to the time difference between the receiving time and the transmitting time. If the distance is less than the minimum viewing distance, it means that there is an obstacle in the restricted area; if there is no obstacle in the restricted area, return The second step continues to scan; if there is an obstacle in the restricted area, execute the fourth step, or return to the second step after recording, until all areas are scanned and then enter the fourth step.

After the third step, an infrared remote sensing detection step can also be included. When the third step detects that there is an obstacle in the restricted area, enter this step first; the controller controls the infrared remote sensor to open and more accurately judge whether the obstacle is a person. , if yes, then enter the alarm step, if not, return to the second step to continue scanning.

The fourth step is to alarm by voice prompt or OSD; and return to the second step;

It can be set that if the viewer moves to a safe area after the alarm, the alarm will not be stopped; if the viewer ignores it, further processing will be carried out, such as mandatory standby.

The present invention will be described in more detail with two application examples below.

Embodiment 1, the detection device 108 includes three ultrasonic transmitters 1, 2, 3 and an ultrasonic receiver 4; wherein, the ultrasonic waves emitted by the three ultrasonic transmitters respectively cover three areas as shown in Figure 2: area one, restricted area Two and three. The steps of this embodiment are shown in Figure 5, including:

Step 302, the alarm system starts to operate, and the minimum viewing distance is set;

Step 304, the controller 102 clears the alarm flag;

Step 306, scan three areas respectively, as shown in Figure 2;

First scan area 1: the controller 102 controls the ultrasonic transmitters 2 and 3 to turn off, the ultrasonic transmitter 1 is turned on and emits ultrasonic waves, and the controller 102 records the time S1 for emitting ultrasonic waves;

If the ultrasonic receiver 4 receives the reflected ultrasonic wave, it will generate an electrical signal; once the controller 102 detects the electrical signal generated by the receiver 4, it will record the receiving time R1, and then calculate the distance between the system and the obstacle according to S1 and R1— —that is, the distance between the television set and the obstacle, if the distance is less than the minimum viewing distance set in step 302, then set the alarm sign F1, continue to scan the restricted area two; if the ultrasonic receiver 4 does not receive the reflection within a certain period of time If the ultrasonic wave does not generate an electrical signal, it continues to scan the restricted area 2; the "certain time" should be greater than or equal to twice the ratio of the scanning distance to the ultrasonic speed.

Scanning restricted area 2: the controller 102 controls the ultrasonic transmitters 1 and 3 to be turned off, the ultrasonic transmitter 2 is turned on and emits ultrasonic waves, and the time S2 for emitting ultrasonic waves is recorded;

If the ultrasonic receiver 4 receives the reflected ultrasonic wave and then produces an electrical signal, the controller 102 detects that the electrical signal generated by the receiver 4 just sets the alarm sign F2 and continues to scan the restricted area three; if the ultrasonic receiver 4 does not receive the reflection If there is no electrical signal in the returned ultrasonic wave, continue to scan restricted area 3;

Scanning restricted area 3: the controller controls the ultrasonic transmitters 1 and 2 to be turned off, the ultrasonic transmitter 3 is turned on and emits ultrasonic waves, and the time S3 for emitting ultrasonic waves is recorded;

If the ultrasonic receiver 4 receives the reflected ultrasonic wave and then produces an electrical signal, the controller 102 detects that the electrical signal generated by the receiver 4 just sets the alarm sign F3 and enters step 308; if the ultrasonic receiver 4 does not receive the reflected ultrasonic signal If there is no electrical signal, enter step 308;

In this step, the electrical signals sent from the detection device 108 to the controller 102 are all processed by the gain controller 106 .

In step 308, the controller 102 detects the alarm flags, and if none of the three alarm flags is set, then returns to step 306; if one or more of the three alarm flags is set, then enters step 310.

Step 310, alarm; return to step 304 after the alarm is over.

Embodiment 2, the detection device 108 includes three ultrasonic transmitters 1, 2, 3, an ultrasonic receiver 4 and an infrared remote sensor; wherein, the ultrasonic waves emitted by the three ultrasonic transmitters cover three areas as shown in Figure 2 respectively: Area 1, Restricted Areas 2 and 3. It can further and more accurately identify whether the detected obstacle is a person, thereby reducing unnecessary alarms and will not affect normal viewing:

The steps of this embodiment are shown in Figure 6, including:

Step 402, the system starts running, and the initial state of the entire system is set: setting the minimum viewing distance and the infrared detection distance; in this embodiment, the setting of the infrared detection distance is realized by setting the infrared detection threshold.

Step 404, the controller 102 clears the alarm flag,

Step 406, scan three areas respectively, as shown in Figure 2;

Scanning area 1: the controller 102 controls the ultrasonic transmitter 1 to turn on, 2 and 3 to turn off, and records the time S1 of ultrasonic emission;

If the ultrasonic receiver 4 receives the reflected ultrasonic wave, it will generate an electrical signal. Once the controller 102 detects the electrical signal generated by the receiver 4, it will record the receiving time R1, and then calculate the distance to the obstacle according to S1 and R1. If the distance is less than the minimum viewing distance, set the alarm flag F1 and continue to scan restricted area 2;

If the ultrasonic receiver does not receive the reflected ultrasonic wave and there is no electrical signal, continue to scan the restricted area 2;

Scanning restricted area 2: the controller controls the ultrasonic transmitter 2 to turn on, 1 and 3 to turn off, and records the time S2 of ultrasonic emission;

If the ultrasonic receiver 4 receives the reflected ultrasonic wave, it generates an electrical signal, and the controller 102 detects the electrical signal generated by the receiver 4 and sets the alarm flag F2;

If the ultrasonic receiver does not receive the reflected ultrasonic wave and there is no electrical signal, continue to scan the restricted area 3;

Scanning restricted area 3: the controller controls the ultrasonic transmitter 3 to be turned on, 1 and 2 to be turned off, and records the time S3 of ultrasonic emission;

If the ultrasonic receiver receives the reflected ultrasonic wave, it generates an electrical signal, and the controller 102 detects the electrical signal generated by the receiver 4 and sets the alarm flag F3;

If the ultrasonic receiver does not receive the reflected ultrasonic wave and there is no electrical signal, then enter step 408;

In this step, the electrical signals sent from the detection device 108 to the controller 102 are all processed by the gain controller 106 .

In step 408, the controller 102 detects the alarm flags. If none of the three alarm flags is set, return to step 406; if one or more of the three alarm flags is set, then enter step 410.

Step 410, turn on the infrared remote sensor, receive infrared rays, generate an electrical signal, transmit it to the microprocessor through the gain controller, and convert it into a value through A/D;

Step 412, judging whether the value in the previous step is greater than the set infrared detection threshold, if it is greater, it means that someone is watching in the restricted area, and enters step 414; if the detected value is smaller than the infrared detection threshold, then it means that there is an obstacle in the restricted area If the object is not a person, return to step 404;

Step 414, alarm, return to step 404 after the alarm is over.

Claims (13)

1. a television view warning system comprises warning device, sniffer and signal processing apparatus, it is characterized in that, also comprises controller, wherein:

Described sniffer scans zones of different respectively and scanning result is sent to signal processing apparatus under the control of controller; Described zone comprises at least to be watched the suitable regional A of TV angle and watches the inappropriate area B of TV angle;

Described signal processing apparatus sends to described controller after described scanning result is handled;

Store minimum viewing distance in the described controller; Controller judges according to described scanning result whether the zone of being scanned exists barrier; When having barrier with TV distance in less than the part of minimum viewing distance and/or area B among the regional A, the controller indicating alarm device is reported to the police.

2. television view warning system as claimed in claim 1 is characterized in that described signal processing device is changed to gain controller;

Elder generation's emission detection ripple when described sniffer scans produces corresponding signal and sends to gain controller when receiving reflection wave;

After gaining, the signal that described gain controller is exported sniffer according to the gain coefficient of storing in the described controller offers controller;

When scanning area B, if described controller receives that described expression receives the signal of reflection wave then indicating alarm device is reported to the police; When scanning area A, if described controller receives that described expression receives the signal of reflection wave then the distance of dyscalculia thing and TV, when this distance during less than minimum viewing distance indicating alarm device report to the police.

3. television view warning system as claimed in claim 2 is characterized in that: described sniffer comprises three ultrasonic transmitters and a ultrasonic receiver; By the reflection equipment in the adjustment ultrasonic transmitter it is set and launches hyperacoustic angular range, make three ultrasonic transmitter institute ultrasonic waves transmitted overlay area A respectively, the left-half of area B and the right half part of area B; The range of receiving of described ultrasonic receiver comprises regional A and area B;

Described sniffer opens the transmitter corresponding with wanting scanning area and cuts out other transmitter under the control of controller, respectively to zones of different emission ultrasound wave.

4. television view warning system as claimed in claim 2 is characterized in that: described sniffer comprises a ultrasonic transmitter and a ultrasonic receiver; Described ultrasonic transmitter is launched ultrasound wave to regional A and area B respectively under the control of described controller; The range of receiving of described ultrasonic receiver comprises regional A and area B.

5. television view warning system as claimed in claim 4 is characterized in that: also comprise input media;

Be divided into the different time periods hunting period of described ultrasonic transmitter; Described input media is used for by setting the length of described time period, is regional A and area B with the area dividing that scans.

6. as claim 3 or 4 described television view warning systems, it is characterized in that: described sniffer also comprises infrared remote sensor; Described controller is before indicating alarm device is reported to the police, and the control infrared remote sensor carries out infrared remote sensing to the barrier that scans earlier, and when described barrier is a man-hour, controller indicates described warning device to report to the police.

7. as claim 3 or 4 described television view warning systems, it is characterized in that, also comprise: input media, be used for that setting controller stores minimum viewing distance, also be used to set the ultrasonic scanning distance; Gain coefficient or the ultrasound examination threshold setting ultrasonic scanning distance of described input media by storing in the setting controller.

8. television view warning system as claimed in claim 6 is characterized in that, also comprises: input media is used to set the infrared acquisition distance; Gain coefficient or the infrared detection threshold setting infrared acquisition distance of described input media by storing in the setting controller.

9. as claim 3 or 4 described television view warning systems, it is characterized in that described warning device also comprises a timer, the time of this start is carried out timing; Store predetermined viewing time length in the described controller; When the timing in the timer surpassed described viewing time length, the controller indicating alarm device was reported to the police.

10. a television-viewing alarm method is characterized in that, may further comprise the steps:

(a) surveyed area is divided into watches the suitable regional A of TV angle and watch the inappropriate area B of TV angle; Minimum viewing distance and scanning distance are set; Among the described regional A, with TV distance be zone C less than the part of minimum viewing distance;

(b) zones of different is scanned successively;

(c) judge whether there is barrier in described zone C and the area B according to scanning result; If have at least a zone to have barrier then execution in step (d); Do not exist and then return step (b);

(d) report to the police; Return (b).

11. the described television-viewing alarm method of claim 9 is characterized in that, in the described step (a), the infrared acquisition distance is set; In the described step (c), when there is barrier in judgement, carry out infrared remote sensing, whether the disturbance in judgement thing is the people, is execution in step (d) then; Otherwise return step (b).

12., it is characterized in that in the described step (b), the concrete steps of scanning are: the emission ultrasound wave as claim 9 or 10 described television-viewing alarm methods; If receive reflection wave then produce corresponding signal.

13. television-viewing alarm method as claimed in claim 11 is characterized in that, in the described step (c):

Judge whether exist the method for barrier to be in the area B: if receive reflection wave during scanning area B then have barrier in the area B;

Judge whether exist the method for barrier to be in the zone C: if receive reflection wave during scanning area C, then according to launching ultrasound wave and receiving the Time Calculation barrier of reflection wave and the distance of TV, if less than minimum viewing distance, then there is barrier in this distance in the zone C.

Images