CN201174169Y - Universal decoding and identification device for universal remote control receiver - Google Patents

Abstract

The utility model discloses a universal decoding and identification device for a universal remote control receiver, which can save the use of microprocessor resources, improve the efficiency of the microprocessor, and further improve the quality of multimedia output. The device includes: a counting unit, used to receive a remote control signal and calculate the number of signal cycles passed between two adjacent signal transitions in the control signal; and a logic unit, used according to the signal The cycle number identifies a plurality of decoded data.

Description

Universal decoding and identification device for universal remote control receiver

technical field

The utility model relates to a device for identifying instructions of a remote controller, in particular to a universal decoding and identifying device for a universal remote control receiver.

Background technique

With the advancement of electronic technology, various electronic devices have become a part of modern social life. Consumable multimedia products such as televisions, CD players, and digital versatile CD players are generally used in the lives of the general public. In order to allow users to conveniently control various functions, many electronic devices are equipped with corresponding remote controls, especially wireless remote controls, so that users can freely control the electronic devices through the remote control.

The well-known infrared remote control system is one-to-one, that is, each electronic device has a dedicated remote control, and each function it can perform will be fixedly corresponding to a remote control signal with specific information. There are multiple buttons on the remote control to control different functions. When the user wants to control the electronic device to perform a certain function, the user can press the button corresponding to the function on the remote control to let the remote control send The remote control signal carries the specific information corresponding to the function. When the electronic device receives the remote control signal, it will interpret the specific information in the remote control signal, and execute related functions according to the correspondence between the specific information and functions.

Generally speaking, the communication technology used by the remote controller is infrared or radio frequency (Radio Frequency) transmission technology. Wireless radio frequency transmission technology does not have the problem of operating orientation, and is bidirectional. It not only sends remote control signals, but also receives status information of home appliances and presents them directly on the remote control. However, the infrared remote controller has the characteristics of small size, low power consumption, powerful functions, and low cost, making the infrared remote controller the most widely used remote control device at present.

FIG. 1 is a schematic diagram of a conventional infrared remote control system 10 . The infrared remote control system 10 includes a transmitter 12 and a receiver 14 . The transmitter 12 includes an input interface 120 , an encoding module 122 and an infrared transmitter 126 . The receiving end 14 includes an infrared receiver 140 , a control module 144 and a function module 146 . In the transmitting end 12 , the input interface 120 includes a plurality of keys corresponding to different functions. The user can press the keys of the input interface 120 to start or end the function of the electronic device. The encoding module 122 can convert the output signal of the input interface 120 into a digital signal composed of 0 and 1 according to a preset principle, and add a header or fill data, etc., encode it into a packet of a specific format, and transmit it through the infrared transmitter 126 transmits the control signal to the receiving end 14 in the form of infrared light. On the contrary, in the receiving end 14, the infrared receiver 140 can convert the signal emitted by the infrared emitter 126 into an electronic signal through photoelectric conversion processing. The control module 144 includes a microcontroller 148 and a storage unit 150, which are used to execute instructions for demodulation, decoding, and identification of the transmitter 12. It can convert the electronic signal from an infrared carrier to a base frequency to identify the output of the transmitter 12. , and execute the corresponding functions F(1) . . . F(n) through the function module 146 .

In the infrared remote control system 10, since only a small amount of data is transmitted from the transmitting end 12 to the receiving end 14, the most important thing in the transmission process is to ensure correctness. The existing technology has developed different coding standards. In Europe, the most common standards are RC-5 code and RECS 80 code; in the Far East, it is NEC code. In addition, many consumer electronics manufacturers (such as Mitsubishi, Panasonic, JVC, etc.) have their own dedicated standards. The modulation methods adopted by the above encoding standards can be broadly classified into: Phase Modulation, Pulse Width Modulation and Pulse Position Modulation. Please refer to FIG. 2 to FIG. 4, which respectively show the schematic diagrams of waveforms of 0 and 1 after phase modulation, pulse width modulation and pulse position modulation. In phase modulation, the falling edge represents "0" and the rising edge represents "1" in the unit time interval. Pulse width modulation is based on the ratio (duty cycle) of transmitting infrared carrier modulation high and low levels to represent "0" and "1"; for example: in the NEC coding standard, "0" is a high level of 0.56 milliseconds (ms, millisecond), the low level is 0.56 milliseconds; "1" means the high level is 0.56 milliseconds, and the low level is 1.68 milliseconds. In pulse position modulation, "0" and "1" are distinguished by the position where the pulse appears.

For the above modulation methods, the control module 144 uses different demodulation and decoding methods to obtain the control commands output by the transmitter 12 . Taking pulse width modulation as an example, the microcontroller 148 in the control module 144 calculates the duration of the high and low levels according to its built-in timer, so as to identify the received signal as 0 or 1. In other words, the decoding process of the control module 144 needs to use the timer of the microcontroller 148 . Generally speaking, in a multimedia device, the microcontroller 148 needs to perform computing functions such as video and audio processing in addition to demodulation and decoding functions. The existing decoding process needs to use the timer of the microcontroller 148, thus occupying important resources of the microcontroller 148, causing the microcontroller 144 to reduce the efficiency of image and sound processing, and affect the quality of multimedia output; in addition, The above-mentioned multiple decoding standards, the existing remote control system uses exclusive one-to-one hardware to implement one of the decoding standards, which is inflexible to the realization of the terminal of the system manufacturer. For example, an infrared receiver is required in an LCD TV, but the LCD TV It needs to be sold all over the world, and the exclusive decoding infrared system is very inconvenient for system manufacturers.

new content

The technical problem to be solved by the utility model is to provide a universal decoding and identification device for a universal remote control receiver, which can save the resource usage of the microprocessor, improve the efficiency of the microprocessor, and then improve the quality of multimedia output .

In order to solve the above technical problems, the utility model provides a universal decoding and identification device for a universal remote control receiver, which includes: a counting unit, used to receive a remote control signal and calculate two adjacent A plurality of signal cycles passed between signal transitions; and a logic unit used to identify a plurality of decoding data according to the signal cycles.

Because the utility model calculates the number of signal cycles between adjacent signal transitions in the control signal sent by the remote controller, such as the number of signal cycles from the falling edge of each waveform to the rising edge of an adjacent waveform, the data To identify the corresponding command of the control signal, according to the disclosure of the utility model, the timer used to calculate the duration of the high and low levels in the microprocessor can be saved, so the resource usage of the microprocessor can be saved, and its efficiency can be improved. The quality of multimedia output. In addition, in addition to the decoding operation through the hardware circuit, the utility model can also perform the original data decoding operation through the microprocessor to meet the needs of different infrared remote control systems and provide system manufacturers with maximum design flexibility and convenience , so as to realize a universal remote control receiver and save production time and cost of system manufacturers.

Description of drawings

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of an existing infrared remote control system.

FIG. 2 is a schematic diagram of a waveform of phase modulation.

FIG. 3 is a schematic diagram of a pulse width modulation waveform.

FIG. 4 is a schematic diagram of a waveform of pulse position modulation.

FIG. 5 is a flow chart of identifying remote control commands according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of an infrared remote control system for an electronic device according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a decoding and identification device.

FIG. 8 shows a schematic diagram of a decoding logic unit according to an embodiment of the present invention.

[Description of main component symbols]

10, 60 infrared remote control system

12, 62 transmitter

14, 64 receiving end

120, 620 input interface

122, 622 encoding module

126, 626 infrared emitters

140, 640 infrared receiver

642 decoding identification device

144, 644 control module

146, 646 function modules

148 microcontrollers

150 storage units

700 receiver

702 counting unit

704 logic unit

800 edge detection units

802 buffer

804 decoding identification unit

806 decoding database

808 FIFO storage unit

810 multitasker

50 processes

500, 502, 504, 506, 508 steps

812 signal

814, 816, 817 signal path

Detailed ways

As shown in FIG. 5 , it is a schematic diagram of a process 50 for identifying remote control commands according to an embodiment of the present invention, which includes the following steps:

Step 500: start.

Step 502: Receive a remote control signal output by the remote controller.

Step 504: Calculate the number of signal cycles from the falling edge of the waveform of the control signal to the rising edge of the adjacent waveform.

Step 506: Identify the command corresponding to the control signal according to the number of signal cycles elapsed from the falling edge of each waveform in the control signal to the rising edge of the adjacent waveform.

Step 508: end.

The utility model calculates the number of signal cycles from the falling edge of the waveform in the control signal to the rising edge of the adjacent waveform, so as to identify the command corresponding to the control signal. Taking pulse width modulation as an example (as shown in Figure 3), the pulse width modulation system represents "0" and "1" by the ratio (duty cycle) of transmitting infrared carrier modulation high and low levels, such as: In the NEC coding standard, it is assumed that the signal period is 1 microsecond (μs, microsecond), "0" is 0.56 milliseconds for high level, 0.56 milliseconds for low level; "1" is 0.56 milliseconds for high level, 1.68 milliseconds for low level. Therefore, when the number of signal cycles from the falling edge of the waveform to the rising edge of the adjacent waveform is about 560 (0.56ms/1μs), the corresponding bit is "0"; when the falling edge of the waveform to the rising edge of the adjacent waveform When the number of signal cycles passed is about 1680 (1.68ms/1μs), the corresponding bit is "1". Preferably, the corresponding bit information can be identified according to the number of signal cycles elapsed from the falling edge of the waveform to the rising edge of the adjacent waveform. After obtaining all the bits of the control signal, the command corresponding to the control signal can be identified accordingly. Preferably, the pulse width modulation is to distinguish the signals of "0" and "1" by the low-level time, and calculate the signal period from the falling edge of the waveform to the rising edge of the adjacent waveform that is behind the falling edge of the waveform in timing. number. Of course, if the pulse width modulation system uses high-level time to distinguish "0" and "1" signals, the utility model can also calculate the passage from the falling edge of the waveform to the rising edge of the adjacent waveform that is ahead of the falling edge of the waveform in timing The number of signal cycles; in terms of signal type, the high and low levels can also be inverted according to the designer's habit; those who are familiar with this technology can make different changes according to the different modulation methods.

In order to identify the command corresponding to the control signal according to the number of signal cycles, a plurality of preset commands can be set first, and each preset command corresponds to a combination of preset signal cycle numbers; then, when each of the control signals is judged in sequence After the combination of the number of signal cycles elapsed from the falling edge of the waveform to the rising edge of an adjacent waveform, it can be compared whether the combination matches a preset number of signal cycles. If yes, it can be identified that the command corresponding to the control signal is the default command corresponding to the preset signal cycle number combination. That is to say, after obtaining the number of signal cycles from the falling edge of each waveform to the rising edge of an adjacent waveform, the commands issued by the remote controller can be identified according to the combination of all signal cycle numbers.

In order to avoid noise or electromagnetic surge interference, the first threshold value and the second threshold value can be set when judging the number of signal cycles. When the judged signal cycle number is greater than the difference between the first value and the first threshold value and When it is less than the sum of the first value and the second threshold value, it is still judged that the number of signal cycles is the first value, and the first threshold value and the second threshold value can be set by the hardware register in the remote control, Therefore, it is very flexible, even the first threshold value and the second threshold value can be set to the same value through a single register to achieve a similar effect, which should be understood by those skilled in the art. In this way, if the control signal is disturbed by noise and the waveform is unstable, the corresponding command can still be correctly identified; The transmission itself is also easily affected by noise interference. Therefore, it is very beneficial for the sensitivity and correctness of the identification control command to have an adjustable reference point for signal judgment.

FIG. 6 shows a schematic diagram of an infrared remote control system 60 for electronic devices according to an embodiment of the present invention. The infrared remote control system 60 includes a transmitter 62 and a receiver 64 . The transmitting end 62 includes an input interface 620 , an encoding module 622 and an infrared transmitter 626 . The receiving end 64 includes an infrared receiver 640 , a decoding and identifying device 642 , a control module 644 and a function module 646 . In the transmitting end 62 , the input interface 620 includes a plurality of buttons corresponding to different functions. The user can activate or end the function of the electronic device by pressing the button of the input interface 620 . The encoding module 622 can convert the output signal of the input interface 620 into a digital signal of 0 and 1 according to a preset principle, and add a header or fill data, etc., encode it into a packet of a specific format, and send it through the infrared transmitter 626 The control signal is transmitted to the receiving end 64 in the form of infrared light. On the contrary, in the receiving end 64, the infrared receiver 640 can convert the signal emitted by the infrared emitter 626 into an electronic signal through photoelectric conversion processing. The decoding and identifying device 642 can implement the process 50 for identifying the command of the control signal output by the transmitter 62 . The control module 644 is used to instruct the function module 646 to execute the corresponding functions F'(1)...F'(n) according to the recognition result of the decoding and recognition device 642 .

FIG. 7 shows a schematic diagram of a decoding and identifying device 642 according to an embodiment of the present invention, including a receiving end 700 , a counting unit 702 and a logic unit 704 . The receiving end 700 is used for receiving the control signal output by the transmitting end 62 through the infrared receiver 640 . The counting unit 702 is used to count the number of signal cycles from the falling edge of the waveform to the rising edge of the adjacent waveform in the control signal received by the receiving end 700 . The logic unit 704 identifies the command corresponding to the control signal according to the calculation result of the counting unit 702 . The decoding and identifying device 642 calculates the number of signal cycles from the falling edge of the waveform in the control signal to the rising edge of the adjacent waveform, so as to identify the command corresponding to the control signal. Taking pulse width modulation as an example (as shown in Figure 3), the pulse width modulation system represents "0" and "1" by the ratio (duty cycle) of the low level and high level of the transmitted infrared carrier, such as: In the NEC coding standard, in this embodiment, it is assumed that the counting unit 702 uses a signal period of 1 microsecond (μs, microsecond), "0" is a high level of 0.56 milliseconds, and a low level of 0.56 milliseconds; "1" is a high level 0.56 milliseconds, low level 1.68 milliseconds. Therefore, when the number of signal cycles calculated by the counting unit 702 from the falling edge is about 560 (0.56ms/1μs), the logic unit 704 can determine that the corresponding bit is “0”; When the calculated signal cycle number is approximately 1680 (1.68ms/1μs), the logic unit 704 can determine that the corresponding bit is "1". In other words, the decoding and identifying device 642 judges the corresponding bit according to the number of signal cycles elapsed from the falling edge of the waveform to the rising edge of the adjacent waveform. After all the bits of the control signal are obtained, the logic unit 704 is used to identify the command corresponding to the control signal. It should be noted that when the pulse width modulation uses the carrier low level time to distinguish the signal of "0" and "1", the counting unit 702 counts the time elapsed from the falling edge of the waveform to the rising edge of the adjacent waveform that is behind the falling edge of the waveform in timing number of signal cycles. Of course, if the pulse width modulation system uses high level time to distinguish "0" and "1" signals, the counting unit 702 can calculate the time elapsed from the falling edge of the waveform to the rising edge of the adjacent waveform that is ahead of the falling edge of the waveform in timing number of signal cycles. Those who are familiar with this technique can make different changes according to different modulation methods, for example, according to the number of signal cycles elapsed from the falling edge of the waveform to the rising edge of the adjacent waveform (behind or ahead in timing) as the basis for judgment.

In the decoding and identification device 642 , a denoising unit (not shown) is preferably provided between the infrared receiver 640 and the receiving end 700 to eliminate electromagnetic glitch interference of the control signal.

In the decoding identification device 642, the logic unit 704 judges the corresponding bit according to the counting result of the counting unit 702, which can be realized by the microprocessor and the program code (not shown in the 6th figure) in the control module 644, Alternatively, it may be implemented with independent hardware circuits or firmware. FIG. 8 shows a schematic diagram of a logic unit 704 according to an embodiment of the present invention, which includes an edge detection unit 800, a register 802, a decoding identification unit 804, a decoding database (code bank) 806 and a first-in-first-out storage unit 808. The register 802 can set a first threshold and a second threshold. According to the first threshold value and the second threshold value, when the number of signal cycles counted by the counting unit 702 is greater than the difference between the first value and the first threshold value and less than the sum of the first value and the second threshold value , the edge detection unit 800 determines that the number of signal cycles is a first value. When the waveform of the control signal is disturbed by noise and the waveform is unstable, the corresponding decoded data can still be correctly judged. The decoding database 806 is used to store a plurality of decoding data. When the combination of the number of signal cycles from the falling edge of each waveform to the rising edge of an adjacent waveform obtained by the edge detection unit 800 is equal to a preset combination of signal cycles, the decoding and identification unit 804 can identify the control signal. The corresponding command is the decoded data or command corresponding to the preset signal cycle number combination. The FIFO storage unit 808 is used to store the decoding data or instruction codes output by the decoding database 806 , and transmit the instructions to the control module 644 in a first-in-first-out transmission manner to execute corresponding functions. After the counting unit 702 obtains the number of signal cycles from the falling edge of each waveform to the rising edge of the adjacent waveform; the edge detection unit 800 can flexibly judge whether the position of the edge is reasonable, and send the correct number of signal cycles judged; The code identification unit 804 can identify the data or instructions represented by the signal sent by the remote controller according to the combination of all signal cycle numbers. The decoding identification unit 804 is preferably a state machine (statemachine), for example, because each received signal There will be headers in the front, and the decoding identification unit 804 first identifies whether the headers of each received signal are correct, and then enters the formal identification of the decoding data, and sends the decoding data to the decoding database 806 through the signal path 816, and further , the decoding identification unit 804 can retrieve the decoding data in the decoding database 806 through the signal path 817, further identify and analyze the represented instruction according to the decoding data, and send the instruction into the decoding database through the signal path 816 again 806 temporary storage; then store the instruction in the FIFO storage unit 808 and then send it to the control module 644 for proper processing. The control module 644 is preferably a microprocessor, such as an 8051 microprocessor.

In addition, in Figure 8, the FIFO storage unit 808 can also be used to directly store the counting result (or called raw data, raw data) of the counting unit 702. In this embodiment, the signal 812 can receive the counting result of the counting unit 702 The counting result is directly stored in the first-in-first-out storage unit 808 through the selection of the signal path 814 and the multiplexer 810; The decoding operation of the data can still achieve the purpose of not occupying the internal timer resource of the microprocessor. That is to say, the counting result of the counting unit 702 can be directly sent to the control module 644 through the first-in-first-out storage unit 808 without being processed by the edge detection unit 800, the decoding identification unit 804, and the decoding database 806, so as to meet other requirements. Special applications, such as the case of non-PWM decoding. Therefore, the utility model can be applied to different types of remote control systems. System manufacturers can flexibly realize the decoding function according to different infrared remote control systems. System manufacturers (such as manufacturers of LCD TVs) can use the infrared remote control of the utility model System, it is very convenient to realize different decoding requirements to save production time and cost.

According to the hardware architecture disclosed in Figure 8 of the present invention, three flexible decoding modes can be supported, including full decoding mode (full decode mode), raw data decoding mode (raw data mode), and software decoding mode (software decode mode). In the full decoding mode, the decoding identification unit 804 sends the decoding data into the decoding database 806 through the signal path 816, and then retrieves the decoding data in the decoding database 806 through the signal path 817, and performs Further identify the command represented by the analysis, and send the command to the decoding database 806 for temporary storage through the signal path 816 again, so that the command represented by the signal can be completely parsed out and temporarily stored in the decoding database 806. Processor to fetch instruction response. In the original data decoding mode, the decoding identification unit 804 sends the decoding data to the decoding database 806 through the signal path 816, and then directly sends an interrupt to request the microprocessor to read the decoding data for processing. In the software decoding mode, the counting result of the counting unit 702 is directly stored in the FIFO storage unit 808 through the selection of the signal path 814 and the multiplexer 810, and an interrupt is directly sent to ask the microprocessor to read the counting result for processing. Therefore, this hardware architecture can provide system designers with maximum design flexibility, realize a universal receiver and achieve the purpose of universal decoding.

In summary, the utility model calculates the number of signal cycles between adjacent signal transitions in the control signal sent by the remote controller, for example, the time from the falling edge of each waveform to the rising edge of an adjacent waveform The number of signal cycles is used to identify the corresponding command of the control signal. According to the disclosure of the utility model, the timer used to calculate the duration of the high and low levels in the microprocessor can be saved, so the resource usage of the microprocessor is saved, and Improve its efficiency and enhance the quality of multimedia output. In addition, in addition to the decoding operation through the hardware circuit, the utility model can also perform the original data decoding operation through the microprocessor to meet the needs of different infrared remote control systems and provide system manufacturers with maximum design flexibility and convenience , so as to realize a universal remote control receiver and save production time and cost of system manufacturers.

Claims (7)

1. A universal decoding and identification device for a universal remote control receiver, characterized in that it includes: A counting unit is used to receive a remote control signal and count the number of signal cycles between two adjacent signal transitions in the control signal; a register for storing and setting the first threshold value and the second threshold value; An edge detection unit, coupled to the register, used for when the signal cycle number of the signal cycle number is greater than the difference between the first value and the first threshold value and smaller than the first value and the second threshold value When the sum of limit values is exceeded, the number of signal cycles is still judged to be the first value; a decoding identification unit, coupled to the edge detection unit, for identifying the decoding data; and A decoding database, coupled to the decoding identification unit, is used for storing the decoding data. 2. The universal decoding and identification device for a universal remote control receiver as claimed in claim 1, further comprising a denoising unit coupled in front of the counting unit to eliminate the electromagnetic shock of the control signal. wave interference. 3. The universal decoding and identifying device for a universal remote control receiver as claimed in claim 1, wherein the decoding and identifying unit identifies the remote control command represented by the remote control control signal according to the combination of the decoded data. 4. The universal decoding identification device for a universal remote control receiver as claimed in claim 1, further comprising a first-in-first-out storage unit for storing said decoding data, and the counting unit sends an interrupt A call is made to the microcontroller so that the microcontroller reads the contents of the FIFO storage unit. 5. The universal decoding and identifying device for a universal remote control receiver according to claim 1, wherein the decoding and identifying unit identifies the remote control command represented by the remote control signal according to the combination of the decoded data , and store the remote control command into the decoding database. 6. The universal decoding identification device for a universal remote control receiver as claimed in claim 1, further comprising a first-in-first-out storage unit coupled to the decoding database for storing said decoding data, and the counting unit sends an interrupt call to the microcontroller, so that the microcontroller reads the content of the FIFO storage unit. 7. The universal decoding and identifying device for a universal remote control receiver according to claim 1, further comprising: a multiplexer, coupled to the decoding database and the counting unit; and A FIFO storage unit is coupled to the multiplexer.

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