A receiving head, infrared receiving head, remote controller and smart home system

Abstract

The present invention provides a receiving head with multi-channel input and single signal output, an infrared receiving head, a remote controller and a smart home system, which include: a signal amplification module, used for amplifying an external signal; a signal recognition module, used for screening out signals within a plurality of different specific frequency ranges from the amplified signal, and used for determining the signals within the plurality of different specific frequency ranges; when the signal recognition module determines that the signal within the specific frequency range contains an interference signal, the signal within the specific frequency range cannot enter the signal output module; when the signal recognition module determines that the signal within the specific frequency range does not contain an interference signal, the signal within the specific frequency range enters the signal output module and is outputted by the signal output module; a simple method is used to solve the problem of multi-band interference, and the cost is low and the applicability is strong, more anti-interference solutions are provided for the infrared remote controller and the smart home system having the same, and the infrared receiving system composed of a plurality of groups of receiving heads can be replaced.

Description

Technical Field

[0001] The present invention relates to the technical field of receiving heads, and in particular to a receiving head with multi-channel input and single signal output, an infrared receiving head, a remote controller and a smart home system. Background Art

[0002] The infrared remote control system of the controller is widely used in the household appliance industry. It is the preferred solution for short-distance control, with the characteristics of low price and stable performance. The infrared remote control transceiver system has a paired transmitter and receiver. The infrared receiver is used to decode the signal transmitted by the transmitter. The receiver has a bandpass filter inside, which can pass infrared spectrum signals of the same frequency band. If the external interference signal and the transmitter signal have similar frequencies, the efficiency of passing through the receiver bandpass filter is the same, and the subsequent circuit of the receiver bandpass filter cannot suppress the interference signal, and then the interference signal and the normal signal are analyzed synchronously, causing signal abnormality.

[0003] To solve the above problems, a multi-channel input and output receiving head disclosed in the prior art is used to control the loads of different frequency bands respectively, which is equivalent to installing multiple receiving heads, or equivalent to packaging multiple receiving head chips on one chip to achieve multi-channel input and output. However, the multi-channel output of this technical solution needs to be connected to the chip IO port at the same time, which wastes the resources of the IO port.

[0004] Therefore, there is an urgent need to provide a new technical solution that can solve the multi-band interference problem in a simple way. Summary of the invention

[0005] In view of this, the present invention provides a receiving head with multi-channel input and single signal output, an infrared receiving head, a remote control and a smart home system. The receiving head is designed to have an infrared frequency band screening function and a signal recognition function, and the signal is output at the signal pin of the receiving head after processing, thereby solving the multi-band interference problem of the current receiving head in a simple way. At the same time, the scheme not only has technical advantages, but also provides more anti-interference schemes for the infrared receiving system in a multi-band input and single output manner, and has advantages in multi-band infrared receiving occasions, and can replace the infrared receiving system composed of multiple groups of receiving heads.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts a technical solution: a receiving head with multi-channel input and single signal output, comprising: a signal amplification module, a signal identification module, and a signal output module, wherein the signal amplification module is used to amplify an external signal to obtain an amplified signal; the signal identification module is used to screen out signals within multiple different specific frequency ranges from the amplified signal, and to determine the signals within the multiple different specific frequency ranges; when the signal identification module determines that the signal within the specific frequency range contains an interference signal, the signal within the specific frequency range cannot enter the signal output module; when the signal identification module determines that the signal within the specific frequency range does not contain an interference signal, the signal within the specific frequency range enters the signal output module and is output by it.

[0007] Further optionally, the signal identification module includes a plurality of bandpass filters with different bandwidths; the signal identification module filters out signals within the plurality of different specific frequency ranges through the plurality of bandpass filters with different bandwidths.

[0008] Further optionally, the signal identification module also includes multiple triggers, each trigger having two signal input terminals: a first signal input terminal and a second signal input terminal, wherein the first signal input terminal of each trigger receives a determination signal, and the determination signal is used to determine whether the second signal input terminal of each trigger is turned on; and the second signal input terminal of each trigger receives a corresponding signal within a different specific frequency range.

[0009] Further optionally, the signal identification module also includes a plurality of determination circuits having the same circuit topology, each determination circuit including a signal input terminal and a signal output terminal, a first input terminal and a first output terminal, wherein the first input terminal of each determination circuit is connected to a bandpass filter of a specific bandwidth, and the first output terminal of each determination circuit is connected to a trigger; each determination circuit includes a square wave signal source, a timer and an adder connected in sequence, the timer controls the square wave signal source to provide a preset signal to the adder; the first input terminal provides the adder with a signal within the specific frequency range, and the signal within the specific frequency range and the preset signal are determined in the adder to determine whether the signal within the specific frequency range contains an interference signal; the first output terminal sends the determination signal to the first signal input terminal of the trigger; the determination signal can determine whether the second signal input terminal of each trigger is turned on.

[0010] Further optionally, the signal amplification module includes a preamplifier circuit and a limiting amplifier circuit, and the signal output module includes a hysteresis comparison circuit and an output circuit connected to the hysteresis comparison circuit, wherein the preamplifier circuit and the limiting amplifier circuit are connected to provide the signal identification module with a signal after preamplification and limiting amplification, the signal identification module is connected to the hysteresis comparison circuit, and the hysteresis comparison circuit is connected to the output circuit, wherein a signal within a specific frequency range that does not include an interference signal is output via the hysteresis comparison circuit and the output circuit.

[0011] The present invention also provides an infrared receiving head, which has any of the above-mentioned receiving heads with multi-channel input and single signal output.

[0012] Further optionally, the number of the plurality of bandpass filters is N, and 2≤N≤5.

[0013] Further optionally, there are three bandpass filters, namely a first bandpass filter, a second bandpass filter and a third bandpass filter, wherein the bandwidth of the first bandpass filter is 20KHZ-30KHZ, the bandwidth of the second bandpass filter is 30KHZ-35KHZ, and the bandwidth of the third bandpass filter is 35KHZ-40KHZ.

[0014] The present invention also provides an infrared remote controller, which has any of the infrared receiving heads described above.

[0015] The present invention also provides a smart home system, which is adapted to any of the infrared receiving heads or infrared remote controllers described above.

[0016] The present invention provides a multi-channel input and single signal output receiving head, which improves the anti-interference performance of the receiving head by designing its circuit, solves the problems of complex solutions, high costs and poor applicability in the prior art, and achieves the following beneficial effects:

[0017] 1. Multiple bandpass filters with different frequencies are preset internally to filter external signals. At the same time, different bandpass filters do not interfere with each other, which improves the anti-interference ability of the receiving head;

[0018] 2. The signal analysis module built into the receiving head analyzes the number of pulses received within a certain period of time of the signal input into the adder and compares it with the preset signal according to the preset signal of the determination circuit. Only when the signal meets the trigger condition of the trigger can it be input into the trigger and output as a single signal through the signal output module, thereby avoiding mutual interference between signals of different bandpass filters and improving the anti-interference ability of the receiving head;

[0019] 3. More importantly, this technical solution is simple and has strong applicability. It provides more anti-interference solutions for the infrared receiving system and can replace the infrared receiving system composed of multiple groups of receiving heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a schematic diagram of the internal circuit structure of a receiving head in one embodiment of the present invention;

[0022] Figure 2 It is a circuit diagram of a signal analysis module and a signal output module inside a receiving head in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Example 1

[0026] like Figure 1As shown, this embodiment provides a receiving head with multi-channel input and single signal output, including: a signal amplification module, a signal identification module, and a signal output module, wherein the signal amplification module is used to amplify the external signal to obtain an amplified signal; the signal identification module is used to screen out multiple signals within different specific frequency ranges from the amplified signal, and to determine the signals within multiple different specific frequency ranges; when the signal identification module determines that the signal within the specific frequency range contains an interference signal, the signal within the specific frequency range cannot enter the signal output module; when the signal identification module determines that the signal within the specific frequency range does not contain an interference signal, the signal within the specific frequency range enters the signal output module and is output by it.

[0027] The receiving head in this embodiment designs its internal circuit so that after the circuit of its signal identification module analyzes and determines the amplified signal, the working signal that does not contain the interference signal, that is, the signal within a specific frequency range, is output as a single signal through the signal output module. This not only improves the anti-interference ability of the receiving head, but also has a simple technical solution and strong applicability.

[0028] The signal recognition module in the receiving head can filter the amplified external signal by the frequency band of the signal and input it into the subsequent circuit accordingly, such as Figure 2As shown, in this embodiment, preferably, the signal identification module includes a plurality of bandpass filters with different bandwidths; the signal identification module screens out signals within a plurality of different specific frequency ranges through a plurality of bandpass filters with different bandwidths. In addition, the signal identification module can also input the signal output module to realize single signal output for the signal within the specific frequency range after screening, excluding the interference signal. In this embodiment, preferably, the signal identification module also includes a plurality of triggers, each trigger having two signal input terminals: a first signal input terminal and a second signal input terminal, wherein the first signal input terminal of each trigger receives a determination signal, and the determination signal is used to determine whether the second signal input terminal of each trigger is turned on; the second signal input terminal of each trigger receives a corresponding signal within a different specific frequency range. The interference signal includes a signal with a frequency equal to or different from that of the working signal. In order to exclude the interference signal with the same frequency as the working signal, it is preferred in this embodiment that the signal identification module also includes a plurality of determination circuits with the same circuit topology, each determination circuit includes a signal input terminal and a signal output terminal, a first input terminal and a first output terminal, wherein the first input terminal of each determination circuit is connected to a bandpass filter with a specific bandwidth, and the first output terminal of each determination circuit is connected to a trigger; each determination circuit includes a square wave signal source, a timer and an adder connected in sequence, and the timer controls the square wave signal source to provide a preset signal to the adder; the first input terminal provides a signal within a specific frequency range to the adder, and the signal within the specific frequency range and the preset signal are judged in the adder to determine whether the signal within the specific frequency range contains an interference signal; the first output terminal sends a determination signal to the first signal input terminal of the trigger; the determination signal can determine whether the second signal input terminal of each trigger is turned on.

[0029] like Figure 2 As shown, after the external signal passes through the signal amplification module, it enters the signal identification module. The multiple bandpass filters with different bandwidths in the signal identification module are used for screening, which can filter out interference signals with different frequencies from the working signal, and obtain signals with multiple frequency bands and the same frequency as the working signal. The signals enter the subsequent circuit, i.e., the determination circuit, respectively, and are analyzed and compared with the preset signal; taking the signal of one of the frequency bands as an example, the work of analyzing and comparing it with the preset signal in the determination circuit is analyzed, specifically:

[0030] The timer controls the square wave signal source to provide a preset signal, i.e., a pulse signal with a fixed period duty cycle, to the adder, which can count the number of pulses received within a certain period of time. A signal of a certain frequency band input into the adder from the first input terminal, i.e., the first input signal, is compared with the frequency of the preset signal. During the high level time of the timer, the adder accumulates 1 only when the frequency of the first input signal is the same as that of the preset signal. The accumulated value M of the adder is compared with the preset value N of the adder, wherein the preset value N of the adder is greater than the number of pulses of the infrared signal with the maximum wavelength in the calculated working signal during the high level time of the timer. Therefore: when M is greater than N, it is considered that the signal in this frequency band is interfered, that is, the first input signal is determined to be an interference signal, and the adder outputs a determination signal, which is not the enable signal of the trigger, and cannot turn on the second signal input terminal of the trigger, so the interference signal is not output; during the high level time of the timer, when the value M accumulated by the adder is less than the preset value N of the adder, that is, the first input signal does not contain the interference signal, the adder outputs a determination signal, which is the enable signal of the trigger, and turns on the second signal input terminal of the trigger, that is, outputs the first output signal to the output of the subsequent circuit. Preferably, the adder is a full adder.

[0031] The external signal needs to be amplified by the signal amplification module before entering the signal analysis module. In this embodiment, the signal amplification module preferably includes a preamplifier circuit and a limiting amplifier circuit, and the signal output module includes a hysteresis comparison circuit and an output circuit connected to the hysteresis comparison circuit, wherein the preamplifier circuit and the limiting amplifier circuit are connected to provide the signal after preamplification and limiting amplification to the signal identification module, the signal identification module is connected to the hysteresis comparison circuit, and the hysteresis comparison circuit is connected to the output circuit, wherein the signal within a specific frequency range that does not contain interference signals is output through the hysteresis comparison circuit and the output circuit.

[0032] The receiving head with multi-channel input and single signal output provided in this embodiment improves the anti-interference performance of the receiving head with a relatively simple technical solution.

[0033] Example 2

[0034] This embodiment provides an infrared remote control and a smart home system, wherein the infrared receiving head used has a multi-channel input and single signal output receiving head in Embodiment 1, which can improve the anti-interference ability of the infrared receiving head. Taking into account the packaging difficulty and cost as well as the working efficiency of the infrared receiving head, it is preferred in this embodiment that the number of the multiple bandpass filters is N, and 2≤N≤5. Figure 2 As shown, further preferably, N is equal to 3.

[0035] Considering the frequency band of interference signals that affect the operation of the infrared receiver, such as Figure 2As shown, in the present embodiment, preferably, there are three bandpass filters, namely, the first bandpass filter - bandpass 1, the second bandpass filter - bandpass 2 and the third bandpass filter - bandpass 3, wherein the bandwidth of bandpass 1 is 20KHZ-30KHZ, the bandwidth of bandpass 2 is 30KHZ-35KHZ, and the bandwidth of bandpass 3 is 35KHZ-40KHZ.

[0036] Generally speaking, the infrared system in the infrared remote control and smart home system includes a transmitting system and a receiving system. The transmitting system can allow the transmission of infrared light signals of multiple frequency bands according to actual conditions. The infrared light signals are filtered by the first, second and third bandpass filters to obtain multiple first signals, second signals and third signals with the same duty cycle and different frequencies. Among them, the bandpass filter is a commonly used wideband pass filter, which is composed of an internal operational amplifier circuit. By adjusting different parameters, bandpass filters of different widths can be realized.

[0037] This multi-bandpass input single-channel output infrared receiving head needs to be used in conjunction with an infrared transmitting source with adjustable transmission frequency. The infrared transmitting source can only be set to one frequency band at the same time, so there will not be a situation where the first, second, and third triggers are output at the same time. The multi-bandpass filter is set only to avoid interference with the same frequency band of the receiving head in special and harsh usage environments, which in turn causes the main control to not receive. The multi-bandpass input single-channel output receiving head system can adjust the frequency of the infrared transmitting source according to the reception situation of the first frequency band signal to solve this same frequency band interference problem.

[0038] Specifically, the infrared receiving head in this embodiment can analyze and pass only one frequency band of the infrared spectra of the first signal, the second signal and the third signal according to the principle of preferential passing, and output it through the signal output module. Taking the first bandpass filter, i.e., the bandpass filter 1, as an example, its bandwidth is 25khz-30khz: when the frequency of the interference source is 30khz-35khz and / or 35khz-40khz, its interference frequency is different from the frequency band of the first bandpass filter, and then the 25khz-30khz frequency band signal can be analyzed and output through the signal pin. When the frequency of the interference source is 25khz-30khz, that is, the interference frequency is the same as the frequency band of the first bandpass filter, during the high level time of the timer, when the accumulated value in the adder is greater than the preset value of the adder, the adder outputs a judgment signal, judging that the signal is an interference signal, not an enable signal of the trigger, and cannot make the second signal input terminal of the trigger conductive, and the signal cannot enter the subsequent circuit, thereby discarding the signal in the 25khz-30khz frequency band, and performing a comparison between the second and third bandpass filters.

[0039] The infrared receiving head provided in this embodiment and the infrared remote control and smart home system having the same can filter the external signal through multiple bandpass filters of different frequencies. The signal output module adopts a single signal output, thereby avoiding mutual interference between signals of different bandpass filters and improving the anti-interference ability of the receiving head. More importantly, the technical solution is simple and has strong applicability. It provides more anti-interference solutions for the infrared receiving system and can replace the infrared receiving system composed of multiple groups of receiving heads.

[0040] In summary, the present invention provides a receiving head with multi-channel input and single signal output, which includes: a signal amplification module, a signal identification module, and a signal output module, wherein the signal amplification module is used to amplify the external signal; the signal identification module is used to screen out signals within multiple different specific frequency ranges from the amplified signal, and is used to determine the signals within multiple different specific frequency ranges; when the signal identification module determines that the signal within the specific frequency range contains an interference signal, the signal within the specific frequency range cannot enter the signal output module; when the signal identification module determines that the signal within the specific frequency range does not contain an interference signal, the signal within the specific frequency range enters the signal output module and is output by it; a simple method is used to solve the problem of multi-band interference, and the cost is low and the applicability is strong, and more anti-interference solutions are provided for infrared remote controllers and smart home systems having the same, and the infrared receiving system composed of multiple groups of receiving heads can be replaced.

[0041] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0042] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0043] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0044] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0045] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0046] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A receiving head with multi-channel input and single signal output, comprising: The signal amplification module, the signal identification module, and the signal output module are characterized by: The signal amplification module is used to amplify the external signal; The signal identification module is used to screen out signals within a plurality of different specific frequency ranges from the amplified signal, and to determine the signals within the plurality of different specific frequency ranges; When the signal identification module determines that the signal within the specific frequency range contains an interference signal, the signal within the specific frequency range cannot enter the signal output module; When the signal identification module determines that the signal within the specific frequency range does not contain an interference signal, the signal within the specific frequency range enters the signal output module and is outputted by the signal output module; The signal identification module includes a plurality of bandpass filters with different bandwidths; the signal identification module filters out signals within the plurality of different specific frequency ranges through the plurality of bandpass filters with different bandwidths; The signal identification module further comprises a plurality of triggers, each of which has two signal input terminals: a first signal input terminal and a second signal input terminal, wherein the first signal input terminal of each trigger receives a determination signal, and the determination signal is used to determine whether the second signal input terminal of each trigger is turned on; and the second signal input terminal of each trigger receives a corresponding signal within a different specific frequency range; The signal identification module further comprises a plurality of determination circuits having the same circuit topology, each determination circuit comprising a signal input terminal and a signal output terminal, a first input terminal and a first output terminal, wherein the first input terminal of each determination circuit is connected to a bandpass filter of a specific bandwidth, and the first output terminal of each determination circuit is connected to a trigger; Each of the determination circuits comprises a square wave signal source, a timer and an adder connected in sequence, wherein the timer controls the square wave signal source to provide a preset signal to the adder; The first input terminal provides the adder with a signal within the specific frequency range, and the signal within the specific frequency range and the preset signal are judged in the adder to determine whether the signal within the specific frequency range contains an interference signal; The first output terminal sends the determination signal to the first signal input terminal of the trigger.

2. A receiving head with multi-channel input and single signal output as claimed in claim 1, characterized in that: The signal amplification module includes a preamplification circuit and a limiting amplifier circuit, and the signal output module includes a hysteresis comparison circuit and an output circuit connected to the hysteresis comparison circuit, wherein: The preamplifier circuit is connected to the limiting amplifier circuit to provide the signal recognition module with the signal after preamplification and limiting amplification. The signal identification module is connected to the hysteresis comparison circuit, and the hysteresis comparison circuit is connected to the output circuit, wherein a signal within a specific frequency range that does not include an interference signal is output via the hysteresis comparison circuit and the output circuit.

3. An infrared receiving head, characterized in that: A receiving head with multi-channel input and single signal output as claimed in any one of claims 1 to 2.

4. An infrared receiving head as claimed in claim 3, characterized in that: There are N bandpass filters, and 2≤N≤5.

5. An infrared receiving head as claimed in claim 4, characterized in that: There are three band-pass filters, namely a first band-pass filter, a second band-pass filter and a third band-pass filter, wherein the bandwidth of the first band-pass filter is 20KHZ-30KHZ, the bandwidth of the second band-pass filter is 30KHZ-35KHZ, and the bandwidth of the third band-pass filter is 35KHZ-40KHZ.

6. An infrared remote controller, characterized in that: An infrared receiving head according to any one of claims 3 to 5.

7. A smart home system, characterized in that: Adaptable to the infrared receiving head described in any one of claims 3-5 or the infrared remote controller described in claim 6.

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