KR100784964B1 - The infrared data transmission method for remote control of multimedia devices - Google Patents

Abstract

A remote control infrared data transmission method of a multimedia device is provided to be capable of supplying a wireless data transmission unit necessary for removing lines from various kinds of input devices for the transmission unit to be applied to the various input devices, thereby extending battery life as improving product performance. A preamble section, a start section, an attribute section, and a data section which are selectively omitted are equipped in components of a packet. The data section includes plural bytes. Each byte consists of 4 bit pairs, and each bit pair is composed of 1 carrier section and 1 space section, respectively. The carrier section includes plural carrier frequency pulses. If an idle section exists between packets or the packet is solely transmitted, the preamble section is not omitted. If more than two packets are consecutively transmitted, the preamble section is omitted.

Description

The infrared data transmission method for remote control of multimedia devices}

1 is an infrared packet transmission form

2 is a component of a packet

3 is an infrared transmission signal format

4 is a transmission signal format of a header section;

5 is a bit pair data encoding method

6 is a header section transmission format of a packet when there is a pause section between packets.

7 is a header section transmission format of consecutive packets when there is no idle section between packets.

Table 1 lists the data attribute information.

Table 2 shows allocation device information of packet ID and subpacket ID.

<Explanation of symbols for the main parts of the drawings>

(1): whole packet section including idle section (2): packet section

(2a): front packet section of an adjacent packet (2b): rear packet section of an adjacent packet

(3): idle section (4): header section

(5): data section (6): byte section

(7): preamble section (8): start section

(9): Attribute section (10): Bit pair section

(10a): Bit pair section of binary 00 (10b): Bit pair section of binary 01

(10c): Bit pair section of binary 10 (10d): Bit pair section of binary 11

(11): carrier section (12): space section of the preamble

(13): space section of the start section (14): space section of the attribute section

(15): pulse width (16): pulse period

(17): space section of bit pair 00 (18): space section of bit pair 01

(19): space section of bit pair 10 (20): space section of bit pair 11

The present invention relates to a method for transmitting infrared wireless data, and more particularly, a remote control, a keyboard, a pointing device, a game control device, etc. used as an input tool in various electronic products such as a computer, a game machine, an Internet set-top box, a digital TV, a media player, and the like. It relates to a wireless transmission method of the input information using the infrared medium.

Infrared data transmission means used in conventional remote control products include many infrared transmission protocols such as NEC protocol, Sony SIRC protocol, and Philips RC6 protocol, but they focus on remote control of general home appliances that do not require relatively fast input. As it is designed to be relatively slow in transmission speed and consumes a lot of power, it is suitable for input devices that need to transfer a lot of information such as keyboards, pointing devices, and game control devices, which are the main input tools for information electronic products such as computers, game consoles and Internet set-top boxes. In addition, it was difficult to accommodate all the various input devices due to the limitation of the amount of information that could be accommodated.

The fast transmission protocol includes IrDA infrared data transmission protocol, which is widely used as an international standard for data exchange in information communication devices such as computers, PDAs, and peripherals such as printers, but is mainly designed for fast data transmission between adjacent devices. Is very fast, but the receiving angle is limited to less than 30 degrees and the operating distance is less than 1m, so it is not suitable for remote input devices that require operation from a distance of more than 5m.

There are many other infrared data transmission protocols, but most of them do not overcome the above problems. Some of them are summarized as follows.

The IrDA protocol is an international standard infrared data transmission protocol widely used as a standard for data exchange in information communication devices such as computers, PDAs, and peripherals such as printers. It is mainly designed for fast data transmission between adjacent devices. It uses a very fast and efficient pulse position encoding method that represents two bits in one pulse without using carrier frequencies. Since the position of the pulse is located in one of the four to achieve the effect of transmitting two bits in one pulse, also known as 4PPM (4 Pulse Position Modulation) method. Because the reception angle is limited to up to 30 degrees and the operating distance is short, within 1m, it is not suitable for remote input devices that require operation from a distance of 5m or more.

The NEC protocol uses a carrier frequency of 38 kHz, uses a pulse interval encoding method, has an 8-bit address and an 8-bit command length per message, and transmits the address and command twice to improve data reliability. The transmission packet length is kept constant by inverting and transmitting the bits. The message consists of a header section and a data section. The header section consists of a 9 ms carrier section and a 4.5 ms space section. In the data section, one pulse is 560us wide and uses about 21 cycles of 38 kHz carrier frequency. There is a pulse interval and logic 0 has a pulse interval of 1.12 ms. It takes about 67.42ms to send one message and has a long operation distance and a very reliable protocol. However, there is a weak point in that the transmission speed is relatively slow and the power consumption is high. Since there is no input information in the repeat packet, if the first packet reception fails, the input information is not known even if the repeated packet is repeated.It is not sufficient to replace the existing wired product due to high power consumption and slow transmission speed. There is.

The Sony SIRC protocol uses a pulse width encoding method and is available in 12-, 15- or 20-bit versions per message. The 12-bit version has a 5-bit address and a 7-bit command length. It consists of header part and data part and uses carrier frequency of 40Khz, header part has 2.4ms wide carrier section and 600us wide space section and the pulse representing logic 1 of data section is 1.2ms wide carrier section and 600us wide A pulse representing a logic zero with a space section has a 600us wide carrier section and a 600us wide space section. The 12-bit, 15-bit, and 20-bit versions are available. The 20-bit version has a relatively good data capacity, but there is a limit to replace existing wired products due to its high power consumption and low transmission speed.

The Philips RC6 protocol uses the Manchester coding method, uses a carrier frequency of 36Khz, and consists of a header part and a data part. The header section consists of the reader, start, mode, and trailer sections. The data section consists of 8-bit, 7-bit, or 14-bit custom codes and 24-128 bits of data code. The reader section has a carrier section of 2.666ms width and a space section of 889us width. Logic 0 of the data section is followed by a carrier section of 444us after a space section of 444us, and logic 1 is followed by a space section of 444us after a carrier section of 444us. Logic 0 of the trailer section is followed by a 889us carrier section followed by a 889us space section. Logic 1 is followed by a 889us carrier section followed by a 889us space section. At the end of the packet there is a 2.666 ms idle period to indicate the end of the data. It has very good data capacity, but it also has a slow transmission speed and high power consumption, so there is a limit to replacing existing wired products.

In recent years, information appliances such as computers, game consoles, Internet set-top boxes, digital TVs, DVD players, and the like, are being used at a distance from various types of input devices such as keyboards, pointing devices, and game control devices, which are conventional wired input tools. As the necessity arises, wirelessization is required, and the use of multiple identical devices in one space has required a means of distinguishing between the same devices, and also impedes data transmission between each other when used in close proximity with other devices. There is a need for detection means for transmission errors, and as a device uses several types of wireless input devices, a means for classifying data by input device types is required.

However, the infrared transmission protocols for remote control used in conventional home appliances such as TVs, VCRs and audios are not only able to meet these requirements, but also have slow transmission speeds, high response delays, high power consumption, and limited data capacity. In order to accommodate the existing wired input devices having a large amount of information transmission, there were performance problems such as poor response speed, excessive battery consumption, and reduced control accuracy.

It is an object of the present invention to overcome these problems and to provide a data transmission means for achieving long battery life while maintaining the inherent performance of existing wired input devices. It provides fast transmission speed, low power consumption, sufficient data capacity and flexible expandability, provides transmission error detection means to prevent product malfunction, and provides user ID identification means that can be distinguished from one another among the same devices. In addition, it is an object of the present invention not to require expensive parts, and to be easily applied with a minimum design change when applied to a new product as well as an existing product.

The present invention is similar to the conventional method in that data is transmitted in packet units, but a unique method is used in the format of the transmission signal and the method of encoding and decoding the data.

FIG. 1 shows an infrared packet transmission form of the present invention. In one packet section 1, there is a packet section 2 in which data is transmitted and a pause section 3 in which no data is sent between the packet and the packet.

FIG. 2 shows the components of the packet section 2, which are largely divided into a header section 4 and a data section 5. The header section 4 includes a preamble (7), a start (8), and an attribute (9). The data section 5 is composed of a plurality of bytes 6.

The data section 5 includes packet ID, subpacket ID, message data and checksum value for detecting transmission error, and user ID information for user identification. The packet ID is mainly used to distinguish the types of devices. The subpacket ID is used to identify the characteristics of the device.

The preamble 7 is a signal section for adjusting the sensitivity of the infrared receiving sensor, the start section 8 is a signal section for notifying the start of a packet, and the attribute 9 is composed of one bit pair and the following data area 6 ) Has attribute information and indicates whether the data is inverted or non-inverted. One byte 6 consists of four bit pairs 10 and one bit pair 10 contains two bits. Bit pair 3 corresponds to bits 7 and 6, bit pair 2 corresponds to bits 5 and 4, bit pair 1 corresponds to bits 3 and 2, and bit pair 0 corresponds to bits 1 and 0, respectively. The data transfer order is byte 0, byte 1, byte 2 ... byte n-1, byte n, and the order of transmission of each bit pair within byte is bit pair 3, bit pair 2, bit pair 1, bit Sent in pair 0 order. The last byte of the packet is used for error detection of data and user ID. The sum of byte 0 to byte n-1 of the data is added to the user ID. The result is the sum of 8 or more digits. use.

3 shows the format of an infrared transmission signal, one packet (2) consists of a header section (4) and a data section (5), and the header section includes a preamble (7), a start (8), and an attribute (9). The data section 5 is composed of a plurality of bytes 6, and one byte 6 is composed of four bit pairs 10.

The preamble 7 includes two carrier intervals 11 and one for each bit pair interval 10 of all other unit intervals, that is, the start 8, the attribute 9, and the data interval 5. The carrier section 11 is included. In the present invention, the width of the carrier section 11 becomes a basic unit of timing, and when the width of the carrier section 11 is defined as "t", the time width values of all the unit sections can be expressed as integer multiples of t. For the sake of clarity, the basic unit of timing is defined as "t". There are four bit pairs 10 in each byte section 6, each bit pair 10 includes one carrier section 11, and all carrier sections 11 are equally 1t wide and each carrier The interval between the sections 11 is one of 3t, 4t, 5t or 6t depending on the data value of each bit pair 10. The carrier section 11 includes a plurality of carrier frequency pulses, and the pulse width 15, the pulse period 16, and the number of pulses are determined according to the carrier frequency. In order to unify the decoding methods for a plurality of carrier frequencies into one unit, it is necessary to make the timing of each unit section including the width of the carrier section 11 the same. Thus, in the design of the receiver, only changing the infrared receiver sensor component is necessary. This has the advantage that they can be easily switched between each other. Being able to select one of a plurality of carrier frequencies has the advantage of allowing you to choose a carrier frequency with less interference when there are other devices around you that may interfere with infrared communications, such as electronic fluorescent or tri-wavelength luminaires. to provide.

For example, the carrier frequency of 37.7Khz and 56.3Khz is implemented. For example, when the carrier frequency is 37.7Khz, the pulse period 16 is 26.5us, and when the carrier frequency is 56.3Khz, the pulse period 16 is Since the difference in the period becomes 17.75us to about 3: 2, it can be seen that the width of the carrier section 11 is equal to each other when the number of pulses is 2: 3. If the number of pulses having a carrier frequency of 37.7Khz is eight, the width of the carrier section 11 is 26.5us × 8 = 212us, and the number of pulses at the carrier frequency of 56.3Khz is 3 ÷ 2 × 8 = 12 and the carrier section 11 The width of is 17.75us x 12 = 213us. There is a difference of about 0.47% between the two, because the timing design margin of the present invention is 7% or more, there is no problem in practical use.

Although the number of pulses in the carrier section is set to 8 and 12, the same result can be obtained by using a combination of 6 and 9 or other combinations of 2: 3 ratios such as 10 and 15. When selecting too many pulses, the overall time The longer the delay, the slower the transmission speed and the higher the battery consumption. Also, if the number of pulses less than the threshold value can be detected, the reception performance cannot be guaranteed. You must decide.

By using this principle, it may be easily applied by appropriately adjusting the number of pulses of the carrier section 11 at other carrier frequencies.

4 shows the header section 4 in a subdivided manner, and is composed of a preamble 7, a start 8, and an attribute 9.

The preamble 7 is composed of a carrier section 11 having a width of 1t, a space section 12 having a width of 2t, and another carrier section 11 having a width of 1t with a total length of 4t. The start 8 is composed of a space section 13 of 6t width and a carrier section 11 of 1t width in a total of 7t sections, and the attribute 9 consists of a bit pair of 3t to 6t sections in total. It is the same as the bit pair 10 of the section 5 and consists of a space section 14 having a width of 2t, 3t, 4t or 5t and a carrier section 11 having a width of 1t according to the value of the bit pair. The attribute data represents the attribute of the data section (5) that follows. As shown in Table 1, there are four types of 00, 01, 10, 11, 00 indicates that the transmitted data is normal data, and 01 indicates that the transmitted data is Inverted data indicates that 10 and 11 are unused values for future expansion.

property Data property 00 Normal data (no conversion necessary after data reception) 01 Inverted data (need to invert after receiving data and convert to normal data) 10 unused 11 unused

5 shows a method of encoding a bit pair, wherein each bit pair 10a, 10b, 10c, and 10d includes a space section 17, 18, 19, 20, and a carrier section 11, respectively. As shown in FIG. 3, the carrier section 11 includes a plurality of carrier frequency pulses 15, the width of which is always constant at 1t, and the space sections 17, 18, 19 and 20 are bit pairs. It varies from 2t to 5t according to the data of, and has a width corresponding to the data value of bit pair + 2 times t. In more detail, bit pair data 00 represents a space section 17 of 0 + 2 = 2t width, bit pair data 01 represents a space section 18 of 1 + 2 = 3t width, and bit pair data 10 represents 2 + 2. A space section 19 having a width of 4t and a bit pair data 11 have a space section 20 having a width of 3 + 2 = 5t. Adding the carrier section 11 to the space section results in the width of the entire bit pair section 10. The calculation results in the bit pair data binary 00 being 3t, 01 being 4t, 10 being 5t, and 11 being 6t. In this way, the overall packet width varies according to the data due to the data encoding method that the width of the bit pair is variable. If the bit section data 00 and 01 are large in the data section 5, the overall packet time is shortened. A large number increases the overall packet time. In order to achieve a high data transfer rate, the transmission time of the entire data period is calculated by calculating the width of each bit pair section 10 before the data transmission. If the data is inverted, the transmission time becomes shorter. The attribute value indicates that the transmission data is inverted, and inverts all bits of the data section 5 to transmit.

In this way, if the data transmission time is shortened, the response time of the input device is faster, and smooth operation is possible in the input device that continuously transmits data such as a mouse, so that the control performance of the product can be improved and more data can be sent. There is an advantage.

In the conventional infrared transmission protocol, the width of the carrier section in the header section is generally wider than the carrier section of the data section to distinguish the beginning of the packet. However, in the present invention, unlike the header section 4, the carrier section 11 Since the width is the same as that in the data section 5, the width of the carrier section 11 cannot distinguish the starting point of the packet.

Therefore, the start point of the packet is distinguished by setting the start section in the header section 4 and setting the interval of the carrier section 11 in the start section 8 to 7t different from the carrier section 11 interval 3t to 6t in the data section. . If the width of the carrier section 11 is widened to consume more power to shorten the battery life is to overcome this. In the preamble 7, two carrier sections 11 are used, in which the first carrier section 11 is used to control the sensitivity of the reception sensor, and the second carrier section 11 is the next start section 8. It is used as a reference point to indicate the starting point of.

As shown in FIG. 1, there is a rest period 3 between two adjacent packets 2, and when there is a rest period as shown in FIG. 6, the preamble 7 and the start of the component of the header section 4 are shown. (8) and an attribute section (9).

However, the idle section 3 may be omitted when a plurality of packets are continuously transmitted, and in this case, the preamble section 7 is also omitted in the components of the header section 4. Immediately after the packet is transmitted, the sensitivity of the receiving sensor is already stabilized. Therefore, the preamble section 7 for the sensitivity adjustment is not necessary. Therefore, the preamble section 7 is omitted from the header section 4 of the next packet. The transmission starts from the start section (8).

Therefore, the transmission time and power consumption can be reduced by that much. However, when the preamble section 7 is omitted, as shown in Fig. 7, the end point of the last carrier section 11 of the immediately preceding packet 2a is the starting point of the next packet 2b followed by the start section 8 ) Is followed by the next packet.

There are two types of packets: basic packet and extended packet, basic packet is composed of 32 bit data, and extended packet is composed of 48 bit data. Input devices supported by the basic packet include a button input device such as a keyboard and a remote controller, and a pointing device such as a trackball, a mouse, and a 16-or 8-way pointer. Input devices supported by an extended packet include a game control device and a tablet device.

The data section consists of a 3-bit packet ID, a 1-bit subpacket ID, 20-bit or 36-bit report data, and 8-bit checksum data. The upper 3 bits of the first byte are a packet ID for classifying a packet type, and the next 1 bit is a subpacket ID for classifying a sub packet type.

Table 2 lists the device allocations by packet ID and subpacket ID.

Message data follows the sub-packet ID, and finally checksum data is transmitted. Checksum data is used to detect transmission errors and distinguish between users. If you press and hold a key, repeat packets are generated at regular intervals and continue until you release the pressed key or elapse a certain time. As a means to prevent battery consumption on the sender side, if there is no new key input or no mouse movement after a certain period of time, the input device stops transmitting data and enters sleep mode, which is a low power mode, to reduce battery consumption. . In sleep mode, it preserves the internal memory contents, consumes minimal power to detect external input changes, and immediately wakes up and resumes operation when a new keystroke or mouse movement is detected.

Packet ID Subpacket ID Allocation unit 000 0 Button Input Device (Keyboard) 000 One Button Input Device (Remote Control) 001 0 Relative Coordinate Mode Pointing Device (Mouse) 001 One Relative Coordinate Mode Pointing Device (Preliminary Cost) 010 0 Limited Directional Pointing Device (16-way or 8-way pointer) 010 One Limited Directional Pointing Device (Preliminary Cost) 011 0 Game controls 011 One Game Control Device (Prepaid) 100 0 World coordinate pointing device (digitizer, tablet) 100 One World coordinate pointing device (preliminary cost) 101 - Reserved area 110 - Reserved area 111 - Reserved area for future expansion

As described above, the present invention is a keyboard, a pointing device, and a game control device, which are conventional wired input tools in future information appliances such as computers, game consoles, Internet set-top boxes, digital TVs, DVD players, and home theaters. It can be applied to various input devices by providing the wireless data transmission means necessary to remove the wires from various types of input devices, etc., and extends battery life by providing an alternative means of transmission speed and lower power consumption than the conventional wireless input tools. It has the effect of improving the performance of the product.

Claims (4)

delete In the infrared data transmission method for remote control of a multimedia device, A preamble section, a start section, an attribute section, and a data section, which can be optionally omitted in the component of the packet; The data section comprises a plurality of bytes; Each byte consists of four bit pairs; Each bit pair consists of one carrier section and one space section; The carrier section comprises a plurality of carrier frequency pulses; Each bit pair has a ratio of 3: 4: 5: 6 when the data is binary 00, 01, 10, 11, and has a timing width of each bit pair section corresponding thereto. When there is an idle period between packets or when transmitting a packet alone, the preamble period is not omitted. When transmitting two or more packets in a row, the preamble section is omitted, the infrared data transmission method for remote control of a multimedia device. In the infrared data transmission method for remote control of a multimedia device, A preamble section, a start section, an attribute section, and a data section, which can be optionally omitted in the component of the packet; The data section comprises a plurality of bytes; Each byte consists of four bit pairs; Each bit pair consists of one carrier section and one space section; The carrier section comprises a plurality of carrier frequency pulses; Each bit pair has a ratio of 3: 4: 5: 6 when the data is binary 00, 01, 10, 11, and has a timing width of each bit pair section corresponding thereto. Before transmitting the data, calculate the transmission time of the entire data section by calculating the width of each bit pair section. If the transmission time becomes shorter when the data is inverted, the infrared data transmission method for remote control of a multimedia device, characterized in that the attribute data indicates that the transmission data is inverted and inverts all bits of the data section. The method of claim 3, wherein When the attribute data is binary 00, the transmission data is in a normal state. And when the attribute data is binary 01, the transmission data is inverted.

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