KR20220166547A - Apparatus for Improving IR Reception Distance and Sensitivity of Invisible Set-Top Box using Two IR Receiver - Google Patents

Abstract

An invisible set-top box for improving IR reception distance and sensitivity is proposed. An invisible set-top box for improving IR reception distance and sensitivity proposed in the present invention includes: an IR receiving part including a plurality of IR receivers disposed at an angle to maximize the reception range of an IR signal to receive an IR signal transmitted from an external device and reducing the interference of a Wi-fi signal; and a Wi-fi antenna disposed with a maximum separation distance from the IR receiving part.

Description

Apparatus for Improving IR Reception Distance and Sensitivity of Invisible Set-Top Box using Two IR Receiver}

The present invention relates to an apparatus for improving IR reception distance and sensitivity of an invisible set-top box using an IR receiver.

In general, a remote controller refers to a device capable of remotely controlling a specific device, for example, a home appliance, a sensor, a lighting device, and the like. The remote controller includes a plurality of input keys and applies a radio signal capable of controlling the device according to a user's manipulation of the input keys. It is common to use an infrared (Infra Red; IR) signal as the wireless signal.

Meanwhile, as high-speed Internet services have recently become common, various services using the Internet are being provided. In particular, demand for an Internet Protocol Television (IPTV) service, which provides a broadcasting service through the Internet, is rapidly increasing. The IPTV service allows even those who are not familiar with computers to use a variety of contents and supplementary services, such as movie viewing, home shopping, home banking, and online games, as well as Internet search through a TV set.

In order to watch such an IPTV service, a TV set and an IP set-top box are required. At this time, the IP set-top box is connected to the Internet, receives a broadcast signal transmitted from a service provider, converts it into a standard TV signal, and transmits it to a TV receiver.

Conventional set-top boxes are mostly large-sized products that are mounted in front of a TV, and in recent years, smaller and smaller dongle-type products with a small form factor (SFF) structure are being released.

In a conventional set-top box, there are no obstacles even when a single IR receiver is used, so the user uses the IR remote control without any inconvenience.

However, in the case of recent dongle-type products, the TV is a structure that becomes an obstacle to the IR signal, and when one IR receiver is used, all incoming signals reflected from the IR remote controller cannot be received, which causes inconvenience to the user and affects the completeness of the product. Crazy.

In addition, the IR receiver is a component that is easily affected by Wi-Fi signals, and in particular, in small-sized dongle-type products, Wi-Fi and IR receiver are close, so they are more vulnerable to interference.

Korean Patent Registration No. 10-0752523 (2007.08.21)

An object of the present invention is to provide a method and apparatus for improving IR reception distance and sensitivity by using a plurality of IR receivers to receive an IR signal transmitted from an external device.

In one aspect, the invisible set-top box (ie, Dongle-type product) for improving the IR reception distance and sensitivity proposed in the present invention increases the reception range of the IR signal in order to receive an IR signal transmitted from an external device. An IR receiver including a plurality of IR receivers disposed at an angle to maximize Wi-Fi signal interference and a Wi-fi antenna disposed with a maximum separation distance from the IR receiver.

Each of the plurality of IR receivers of the IR receiver according to an embodiment of the present invention is disposed at different angles from each other.

Each of the plurality of IR receivers of the IR receiver according to an embodiment of the present invention is disposed with an inclination of a predetermined angle that is not vertical or horizontal to the HDMI cable connector portion of the invisible set-top box.

The predetermined angle of each of the plurality of IR receivers according to an embodiment of the present invention is an angle at which a set of reception ranges of each of the plurality of IR receivers maximizes a reception range of an IR signal transmitted from an external device.

The IR receiver according to an embodiment of the present invention includes a first IR receiver and a second IR receiver, and the first IR receiver and the second IR receiver are HDMI cable connectors at different angles that are not vertical or horizontal. It is disposed on both sides of the cable connector portion, and a set of reception ranges of the first IR receiver and the second IR receiver are disposed at an angle of 30 to 45 degrees to maximize the reception range of the IR signal transmitted from the external device.

Each of the plurality of IR receivers of the IR receiver according to an embodiment of the present invention performs a charge/discharge operation on a signal formed in the form of a pulse train by filtering and comparing through an integrator to reduce interference and noise of a Wi-fi signal And receiving the output of the integrator through the Schmitt trigger, performing the Schmitt triggering operation according to the set two threshold voltages, receiving the output of the Schmitt trigger through the output stage, forming the output signal through a switching operation, , the output signal is received through the integrator initialization circuit and the output of the integrator is initialized.

According to the embodiments of the present invention, it is possible to improve the IR reception distance and sensitivity of an invisible set-top box (ie, a Dongle-type product) mounted behind a TV using a plurality of IR receivers, so that VoC (Voice of Customer) ) can be reduced, and it is effective in improving the quality and completeness of the product.

1 is a diagram illustrating a reception angle of an IR signal transmitted from an external device and an invisible set-top box (ie, a Dongle-type product) according to an embodiment of the present invention.
2 is a diagram illustrating an invisible set-top box mounted behind a TV with an HDMI cable according to an embodiment of the present invention.
3 is a diagram showing the configuration of an invisible set-top box for improving IR reception distance and sensitivity according to an embodiment of the present invention.
4 is a block diagram showing an IR receiver according to an embodiment of the present invention.
5 is a timing diagram for explaining the operation of an IR receiver according to an embodiment of the present invention.
6 is a circuit diagram illustrating a reset control unit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a reception angle of an IR signal transmitted from an external device and an invisible set-top box (ie, a Dongle-type product) according to an embodiment of the present invention.

A set-top box according to the prior art has a built-in IR receiver capable of receiving an output signal from an IR remote controller.

Since the IR (Infra Red) method uses infrared rays, signals cannot be properly transmitted and received if there are obstacles that are affected by the straightness of light.

A set-top box according to the prior art is mounted in front of a TV and can directly receive reception from an output signal of an external device (ie, an IR remote controller) without interference from an object.

However, recently, an invisible set-top box (in other words, a dongle-type product) product 110, which is a small form factor (SFF) structure mounted behind a TV with an HDMI cable, has been released, and when mounted behind a TV 120, the TV ( 120) interferes with reception from the output signal of the IR remote controller 130, resulting in a decrease in reception distance and sensitivity, resulting in user inconvenience. This shows the limitations of IR receiving distance and sensitivity of Dongle-type products mounted behind the TV.

In order to overcome this limitation, the present invention proposes a solution capable of improving the reception distance and sensitivity of an IR signal by using a plurality of IR receivers in an invisible set-top box.

2 is a diagram illustrating an invisible set-top box mounted behind a TV with an HDMI cable according to an embodiment of the present invention.

Most of the conventional set-top boxes are large-sized products that are mounted in front of the TV, and in recent years, the size has gradually decreased, and as shown in FIG. An invisible set-top box (ie, Dongle-type product) 210 is being released. The invisible set-top box 210 may be mounted behind the TV 220 to prevent the TV from receiving an output signal from an external device (ie, an IR remote controller). Accordingly, the receiving distance and sensitivity are lowered, resulting in user inconvenience.

In addition, in the case of a conventional set-top box mounted in front of a TV, there are no obstacles even when one IR receiver is used, so that the user can use the IR remote control without any inconvenience. However, in the case of recent Dongle-type products, the TV is a structure that becomes an obstacle to the IR signal, and when one IR receiver is used, all incoming signals reflected from the IR remote control cannot be received, which causes inconvenience to the user and the completeness of the product. It affects.

In addition, the IR receiver is a component that is easily affected by Wi-Fi signals, and in particular, in a small dongle-type product, the Wi-Fi and IR receiver are close, so they are more vulnerable to interference.

Therefore, the present invention proposes an invisible set-top box to improve IR reception distance and sensitivity by using a plurality of IR receivers and to reduce interference of Wi-fi signals.

3 is a diagram showing the configuration of an invisible set-top box for improving IR reception distance and sensitivity according to an embodiment of the present invention.

When one IR receiver according to the prior art is placed in an invisible set-top box (that is, a Dongle-type product), the IR reception distance and sensitivity are limited due to the transmission and reception direction and angle as shown in FIG. 1.

IR signals output when a user uses an external device (ie, an IR remote control) are reflected to the back wall and ceiling of the TV, and in order to receive all of these IR signals, the present invention places two IR receivers at the top as shown in FIG. 3 It can overcome the limitations of IR receiving distance and sensitivity of Dongle-type products. Here, the two IR receivers are only one embodiment and are not limited thereto, and a larger number of IR receivers may be used.

Since the dongle-type product according to the embodiment of the present invention is mounted by an HDMI cable as shown in FIG. 2, the HDMI connector part is at the top, and the IR receiver is installed on both sides of the HDMI connector part to receive all IR signals that are mostly reflected toward the top. Can be placed sideways. In addition, considering the maximum angle of reception from the upper end, it may be arranged with an inclination of about 30 to 45 degrees as shown in FIG. 3 . Through this method, it is possible to solve the quality problem of the remote control of the dongle-type product mounted behind the TV.

In addition, Dongle-type products usually have built-in Wi-Fi, and because the area is small, IR reception sensitivity is weak from Wi-Fi interference when using a general IR receiver. In the embodiment of the present invention, in order to reduce the interference and noise of the Wi-Fi signal, a product resistant to Wi-Fi interference and having a relatively long noise scan time and turn on delay time can be used. For example, an IR receiver made of Vishay's Mneme IC, a part with a part name of TSOP1xxxx, or Opto Electronics' AO-R123C6E-SS can be used.

Referring to FIG. 3, the proposed invisible set-top box 300 for improving IR reception distance and sensitivity is arranged at an angle to maximize the reception range of the IR signal in order to receive an IR signal transmitted from an external device. , IR receiver including a plurality of IR receivers 311 and 312 for reducing interference of Wi-fi signals, and Wi-fi antennas 321 and 322 disposed with a maximum distance from the IR receiver. Although shown as including two IR receivers 311 and 312 in the embodiment of the present invention, it is only an embodiment and is not limited thereto, and a larger number of IR receivers may be used.

Each of the plurality of IR receivers 311 and 312 of the IR receiver may be disposed at different angles 341 and 342 from each other.

Each of the plurality of IR receivers 311 and 312 of the IR receiver may be disposed at an angle 341 and 342 that is not vertical or horizontal to the HDMI cable connector part 300 of the invisible set-top box.

The predetermined angles 341 and 342 of each of the plurality of IR receivers 311 and 312 are transmitted from an external device by a set of reception ranges 351 and 352 of each of the plurality of IR receivers 311 and 312 (351+352). It may be an angle that maximizes the reception range of the IR signal to be.

More specifically, the IR receiver according to an embodiment of the present invention includes a first IR receiver 311 and a second IR receiver 312, and the first IR receiver 311 and the second IR receiver 312 Based on the HDMI cable connector portion 330, they are disposed on both sides of the HDMI cable connector portion at different angles 341 and 342 that are not vertical or horizontal, and the first IR receiver 311 and the second IR receiver 312 Each set of reception ranges 351+352 may be arranged with an inclination 341 of 30 degrees to 45 degrees to maximize the reception range of an IR signal transmitted from an external device. In other words, the first IR receiver 311 may be disposed with an inclination of 30 degrees to 45 degrees, and the second IR receiver 312 may be disposed with an inclination 342 of (180-30) to (180-45) degrees. there is.

Each of the plurality of IR receivers 311 and 312 of the IR receiver according to an embodiment of the present invention is applied to a signal formed in the form of a pulse train by filtering and comparing through an integrator to reduce interference and noise of a Wi-fi signal. A charge/discharge operation is performed, an output of the integrator is received through a Schmitrigger, a Schmitrigging operation is performed according to two set threshold voltages, an output of the Schmiter is received through an output stage, and an output of the integrator is received through a switching operation. An output signal may be formed, the output signal may be received through the integrator initialization circuit, and the output of the integrator may be initialized. An IR receiver according to an embodiment of the present invention will be described in more detail with reference to FIGS. 4 to 6 .

4 is a block diagram showing an IR receiver according to an embodiment of the present invention.

4 is a block diagram showing an IR receiver according to a first embodiment of the present invention. Referring to FIG. 4, the IR receiver according to the present embodiment includes a photodiode 400, a transimpedance 410, an automatic gain amplifier 420, a limiter 430, a band pass filter 440, and a comparator for automatic threshold voltage adjustment. 450, integrator 460, Schmitt trigger 470, output stage 480, auto gain control circuit 490 and integrator initialization circuit 400.

An infrared signal received through the photodiode 400 is input to the impedance amplifier 410 . The impedance amplifier 410 amplifies the current signal detected by the photodiode 400 and converts it into a voltage signal. The converted voltage signal passes through the automatic gain amplifier 420, the limiter 430, and the band pass filter 440 to improve the signal-to-noise ratio and have an increased amplitude. In particular, the automatic gain controller 490 controls the gain factor of the automatic gain amplifier 420. Therefore, the auto-gain amplifier 420 can change its gain factor according to the noise of the output signal of the impedance amplifier 410 and the shape of the signal. In addition, the limiter 430 limits the amplitude within a predetermined range so that overvoltage is not applied to the band pass filter 440 . The signal whose amplitude is limited by the limiter 430 is input to the band pass filter 440. The band pass filter 440 improves selectivity of the IR receiver, and selects and filters only signals within a certain frequency band. The signal filtered through the band pass filter 440 passes through the comparator 150 for automatic threshold voltage regulation and takes the form of a square wave having a predetermined amplitude. After passing through the integrator 460 and the Schmitt trigger 470, it is output in the form of a predetermined pulse wave.

5 is a timing diagram for explaining the operation of an IR receiver according to an embodiment of the present invention.

Referring to FIGS. 4 and 5 , the signal passing through the band pass filter 440 becomes a mixture of a normal signal and a noise level signal. The signal passing through the band pass filter 440 is input to the comparator 450 for automatic threshold voltage regulation. The comparator 450 for automatic threshold voltage regulation is a pulse train or It outputs a signal in the form of a square wave. In the output of the comparator 450 for automatic threshold voltage regulation, a pulse train or square wave signal corresponding to a normal signal and a signal due to the influence of noise are mixed. In FIG. 5, a small pulse train that time-sequentially follows a group of pulse trains corresponds to this. The output of the comparator 450 for automatic threshold voltage regulation is input to the integrator 460. The integrator 460 performs a charging/reversing operation through a capacitor in an internal circuit, and an output level rise and fall operation occurs by the charge/discharge operation using a current source. Subsequently, these signals are input to the Schmitrigger 470. The Schmitt trigger 470 performs a Schmitrigging operation using two threshold voltages. That is, the Schmitt trigger 470 uses the set two threshold voltages Vt1 and Vt2 and transfers them to the output stage 480 . The signal from the output stage 480 is fed back to the integrator initialization circuit 490. The integrator initialization circuit 490 is connected to the output terminal of the integrator 460 and initializes the output signal Cout of the integrator 460 to a ground level. In particular, the integrator initialization circuit 490 delays the output signal Dout of the output stage 480 for a predetermined time and forcibly lowers the output signal Cout of the integrator 460 to the ground level during the delayed time through a logic operation. . The integrator initialization circuit 490 has a reset controller 491 and a reset switch 492 . The reset controller 492 delays the output signal Dout for a predetermined time and outputs the reset control signal Trst through a logical operation on the delayed signal and the output signal Dout. The reset switch 491 performs an on/off operation by the reset control signal Trst, and the output Cout of the integrator 460 is forcibly set to the ground level by the on operation of the reset switch 492. The integrator initialization circuit 490 forcibly resets the output of the integrator 460 according to the aspect of the output signal Dout. That is, in a period in which discharge occurs in the capacitor of the integrator 460 and the output Cout of the integrator 460 is less than the second threshold voltage Vt2, which is the low threshold voltage of the Schmitt trigger 470, the reset control unit 492 operates the reset switch 491 is turned on to reset the output Cout of the integrator 460 to the ground level. Accordingly, the time required for the output level Cout of the integrator 460 to rise to a level sufficient to generate noise increases due to the integration of the noise signal. This means that the Schmitrigger 470 reacts to noise in the signal and more noise must be intervened to reflect the noise to the output. As a result, it means that a normal output signal is mass-produced even against increased noise. Describing this in more detail, the capacitor of the integrator 460 performs a charging operation in section T1 of FIG. 5 . Accordingly, the output level Cout of the integrator 460 gradually rises. When the output level Cout of the integrator 460 exceeds the first threshold voltage Vt1, which is the high threshold voltage of the Schmiter 470, the Schmiter 470 outputs a high level, and the transistor of the output stage 480 is turned on. do. Accordingly, the output signal Dout of the output stage 480 becomes low level. Subsequently, the low level output signal is delayed by the delay time ΔT by the reset control unit 491 and appears in an inverted form. Also, since the reset control signal Trst, which is an output of the reset control unit 492, is not activated, the reset switch 491 is in an off state and the integrator initialization circuit 490 does not affect the operation of the integrator 460. Subsequently, a discharging operation occurs in the capacitor of the integrator in a period T2 in which the charge/discharge control signal exceeds the second reference voltage Vref2 of the integrator. The level Cout of the integrator 460 falls due to the discharging operation. When the output level Cout of the integrator 460 is equal to or less than the second threshold voltage Vt2, which is the low threshold voltage of the Schmitt trigger 470, the Schmitt trigger 470 outputs a low level, and the output stage 480 outputs a high level signal Dout outputs This high level output signal Dout is input to the reset controller 492. The reset control unit 492 performs a logical operation on the output signal Dout of the output stage 480 and the internally delayed signal to form a reset control signal Trst. The reset control signal Trst is activated for a delay time ΔT from the point at which the signal Dout of the output stage 480 transitions to a high level. The activated reset control signal Trst turns on the reset switch 492 and forcibly drops the output signal Cout of the integrator 460 to the ground level. The output Cout of the integrator 460 lowered to the ground level continues for a delay time ΔT. The output signal Cout of the integrator 460 lowered to the ground level extends the charging operation time of the integrator 460 to cause a malfunction due to noise components thereafter. That is, in the conventional case, when noise is input after T1, which is a normal signal period, the output signal Cout of the integrator 460 does not sufficiently descend to the ground level, resulting in malfunction due to the charging operation caused by the noise. to prevent That is, the noise must be continuously applied for a time exceeding the first threshold voltage Vt1 by charging the capacitor of the integrator 460 from the ground level. This aspect of operation makes the IR receiver insensitive to noise.

6 is a circuit diagram illustrating a reset control unit according to an embodiment of the present invention.

Referring to FIG. 6 , the reset controller includes a delay circuit 611 , an inverter 613 and a comparison logic 615 . The operation of the reset controller shown in FIG. 6 is performed by the reset switch 491 during the delay period ΔT in the delay circuit 611 after the output signal Dout from the output stage 480 of the IR receiver transitions from the low level to the high level. turn on During the period in which the reset switch 491 is turned on, the output Cout of the integrator 460 is initialized to the ground level. This will be described together with the timing diagram of FIG. 5 . First, in a period prior to T1 where a normal signal is applied, the output signal Cout of the integrator 460 is below the first threshold voltage Vt1, so the output of the Schmitt trigger 470 maintains a low level. When the output of the Schmitrigger is at a low level, the output signal Dout of the output stage 480 maintains a high level because the transistor of the output stage 480 is in an off state. At this time, the reset control unit 492 controls the reset switch 491 to maintain the OFF state by a signal that has passed through the delay circuit 611 and the inverter 613 of the reset control unit 492 . Therefore, the integrator initialization circuit 490 does not affect the output signal Cout of the integrator 260. When the output of the comparator 250 for automatic threshold voltage regulation produces a normal signal and the signal is applied in the form of a pulse train, the integrator 260 performs a charging operation. Accordingly, the output level Cout of the integrator 260 rises. This corresponds to section T1 of the charge/discharge control signal of the integrator 260. When the output Cout of the integrator 260 exceeds the high threshold voltage Vt1, the Schmitt trigger 270 outputs a high level. The transistor of the output stage 280 is turned on by the output of the high level Schmitt trigger 270, and the output signal Dout transitions to a low level. The low level output signal Dout is fed back to the reset controller 310 . The low-level output signal passing through the delay circuit 611 and the inverter 613 has a predetermined delay time ΔT, and the output signal Dout has an inverted aspect. The signal passing through the delay circuit 611 and the inverter 613 and the output signal Dout are input to the comparison logic 615. When the comparison logic 615 performs an AND operation, a high level is output only when two input signals are high level. Therefore, in period T1 where a normal signal is input, the reset switch 491 is maintained in an off state by the reset control signal Trst. When the input period T1 of the normal signal ends, the integrator 460 performs a discharge operation. The discharging operation is sufficiently performed until the output Cout of the integrator 460 reaches the ground level, unless each component of the IR receiver produces a noise signal. If the output Cout of the integrator 460 drops below the low threshold voltage Vt2 due to the discharging operation, the Schmitt trigger 470 outputs a low level. The transistor of the output stage 480 is turned off by the low level output of the Schmitt trigger 470, and the output signal Dout transitions to a high level. The high-level output signal Dout is fed back to the integrator initialization circuit 490. The comparison logic 615 forms a high level output signal by the output signal Dout transitioned to a high level and a signal that has passed through the delay circuit 611 and the inverter 613. That is, the output signal Dout transitioned to the high level turns on the reset switch 330 during the delay time ΔT of the delay circuit 311, and forcibly maintains the output Dout of the integrator 260 at the ground level. This is done regardless of the charge/discharge operation of the integrator 260 . If the delay time ΔT of the delay circuit 311 elapses, the reset control unit 610 outputs a low level by the comparison logic 615 and the reset switch 491 is turned off.

If, during the discharging operation, noise intervenes following the input period T1 of the normal signal and the rest period T2, the automatic threshold voltage control comparator 450 produces noise in the form of a pulse train. Therefore, during a period Tn in which noise is applied, the integrator 460 performs a charging operation. However, since the integrator 460 has sufficiently dropped to the ground level in the previous section, it takes a considerable amount of time for the output Cout of the integrator 260 to rise to the first threshold voltage Vt1 of the Schmitt trigger 470, which is a level that causes a malfunction. It takes This means that a malfunction occurs only when noise is applied for a very long time, and that the IR receiver according to an embodiment of the present invention has characteristics that are insensitive to noise.

The devices described above may be implemented as hardware components, software components, and/or a combination of hardware components and software components. For example, devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. A processing device may run an operating system (OS) and one or more software applications running on the operating system. A processing device may also access, store, manipulate, process, and generate data in response to execution of software. For convenience of understanding, there are cases in which one processing device is used, but those skilled in the art will understand that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it can include. For example, a processing device may include a plurality of processors or a processor and a controller. Other processing configurations are also possible, such as parallel processors.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device. Software and/or data may be any tangible machine, component, physical device, virtual equipment, computer storage medium or device, intended to be interpreted by or provide instructions or data to a processing device. can be embodied in Software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer readable media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (6)

An IR receiving unit including a plurality of IR receivers disposed at an angle to maximize a reception range of the IR signal to receive an IR signal transmitted from an external device and reducing interference of a Wi-fi signal; and
Wi-fi antenna disposed with the maximum distance from the IR receiver
Invisible set-top box for improving IR reception distance and sensitivity. According to claim 1,
Each of the plurality of IR receivers of the IR receiver,
placed at different angles
Invisible set-top box to improve IR reception distance and sensitivity. According to claim 2,
Each of the plurality of IR receivers of the IR receiver,
Arranged at an inclination of a predetermined angle that is not vertical or horizontal with the HDMI cable connector part of the invisible set-top box
Invisible set-top box to improve IR reception distance and sensitivity. According to claim 3,
The predetermined angle of each of the plurality of IR receivers is an angle at which a set of reception ranges of each of the plurality of IR receivers maximizes the reception range of an IR signal transmitted from an external device.
Invisible set-top box to improve IR reception distance and sensitivity. According to claim 1,
The IR receiver includes a first IR receiver and a second IR receiver,
The first IR receiver and the second IR receiver are respectively disposed on both sides of the HDMI cable connector part at different angles that are not vertical or horizontal based on the HDMI cable connector part, and the reception range of each of the first IR receiver and the second IR receiver The set of is arranged with an inclination of 30 degrees to 45 degrees to maximize the reception range of the IR signal transmitted from the external device
Invisible set-top box to improve IR reception distance and sensitivity. According to claim 1,
Each of the plurality of IR receivers of the IR receiver,
In order to reduce interference and noise of the Wi-fi signal, charge and discharge operations are performed on signals formed in the form of pulse trains by filtering and comparison operations through an integrator, and the output of the integrator is received through a Schmitt trigger, and two set Schmitrigging operation according to threshold voltages is performed, Schmitt trigger output is received through an output stage, the output signal is formed through a switching operation, the output signal is received through an integrator initialization circuit, and an integrator output is initialized. to let
Invisible set-top box to improve IR reception distance and sensitivity.

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