KR20040072571A - Implementation of multifunction USB composite device for presentation - Google Patents

Abstract

PURPOSE: An implementation of a multi-function USB(Universal Serial Bus) complex device for presentation is provided to store presentation data, make the presenter use the device as a wireless microphone, and help the presenter efficiently advance the presentation without a helper through a wireless mouse/keyboard function. CONSTITUTION: A transmitter includes a laser module(31) making a laser pointer irradiate a laser beam by a laser button, and a wireless microphone module converting a voice into an RF(Radio Frequency) signal and transmitting the RF signal. The transmitter includes a function for converting a code of each button(20-24) into the RF signal by a microcontroller(30) receiving the function button information from a human interface device and transmitting the RF signal. A receiver comprises an RF receiver converting the RF signal received from the transmitter into digital data, and a firmware having the function for realizing the human interface device, reading/writing the data to a flash memory, outputting the voice to a speaker by extracting a wireless microphone signal, outputting/storing voice data to a PC through an USB port, and interfacing with the PC through the USB port.

Description

Implementation of multifunctional USB composite device for presentation {Implementation of multifunction USB composite device for presentation}

Existing wireless presentation products add a mouse or keyboard control function to the laser pointer so that the presenter can control the slides by RF remote control. However, the user of such a product has a trouble to use after copying the file where the presentation data is stored to the computer connected to the beam projector through a network or a portable storage device. There is an inconvenience to delete files stored on the computer after the announcement. In addition, if the presenter using a laser pointer with RF remote control is to use a microphone, both hands must be used. A user using a regular laser pointer not only uses both hands but also assists an assistant. You will need to lead a presentation in a very inconvenient environment. In order to perform more than one USB function, you have to connect the devices with the functions to the USB hub device.The device that adds mouse or keyboard control to the laser pointer, removable storage device, and wireless microphone In order to use them together, they must be connected to each USB hub device. However, this is very inconvenient because of the trouble of carrying all the devices separately. To implement a human interface device such as a keyboard / mouse / joystick, a wireless microphone, and portable storage devices as a single device, a device having a human interface device function, a wireless mouse device, and a mobile storage device are respectively connected to a USB hub device. It should be configured in the form That is, there is a disadvantage in that the system can be made light and simple and inexpensive.

In a USB peripheral, it would be more efficient if a device could perform several functions simultaneously rather than just one operation. The present invention provides a USB compound device (USB compound device) configured to integrate controllers having various functions in a USB hub controller and a USB composite device capable of simultaneously performing two or more different functions through one USB controller. ) Is implemented. There are four types of USB interface methods. “Control Transfer”, “Interrupt Transfer”, “Bulk Transfer”, and “Isochronos Transfer” are the “Interrupt Transfers” for human interface devices such as mice and keyboards, “Bulk Transfers” for removable storage devices, The wireless microphone will use "isochronos transfer" respectively. In order to implement such a USB composite device, the "Configuration Descriptor" is expressed in the "Device Descriptor", and the "Interface Descriptor" for the human interface device, the removable storage device, and the wireless microphone device is expressed therein. In the case of an "endpoint descriptor" and a human interface device, additionally required "descriptors" such as "HID descriptor" and "report descriptor" are represented. To develop a device that performs more than one function using a single USB controller, firmware must be efficiently programmed. In addition, to develop as a product, hardware and circuit design must be effective. The program below shows a portion of the source code expressed in the C-language of the device actually implemented.

BYTE Configuration_Descriptor [] = {0x09, // Descriptor length

0x02, // Descriptor type: Configuration

57,0, // Configuration + EndPoints length

0x03, // Number of interfaces

0x01, // Configuration value

0x00, // Configuration string

0xA0, // Attributes

0x32} // Power requirement

The “0x03, // Number of interfaces” shown in the fourth line of the above source code is the setting to perform three or more functions in this unit. Each function is named "interface" and implemented as a program. Here is the source code for the three "interface descriptors":

BYTE HID_Descriptor [] = {0x09, // Descriptor length

0x04, // Descriptor type: Interface

0x00, // Interface Number

.

.

.}

BYTE Mass_storage_Descriptor [] = {0x09, // Descriptor length

0x04, // Descriptor type: Interface

0x01, // Interface Number

.

.

.}

BYTE MIC_Descriptor [] = {0x09, // Descriptor length

0x04, // Descriptor type: Interface

0x02, // Interface Number

.

.

.}

The 0x00, 0x01, and 0x02 shown in the third line of the three source codes above are the indexes for the USB function to be implemented. That is, in both functions, “0x00” represents the first function (interface), human interface device such as keyboard and mouse, and “0x01” represents the second function (interface), removable storage device, “0x02”. Represents the third function (interface), a wireless microphone device. If you want to add additional functions to this, set “Number of Interface” item of Configuration_Descriptor [] to 0x04, and add “Descriptor” for that function and firmware to perform the operation. The present invention can implement a USB composite device by connecting devices having various functions through a USB hub controller, and solve the difficult problems by efficient firmware programming to detect a human interface device (keyboard / mouse) function, It is possible to implement a USB composite device that simultaneously performs a wireless microphone function and a removable storage device function. In the case of the removable storage device function, the flash memory or a small hard disk (HDD) may be used to greatly increase the capacity. In order to interface with various types of memory with one firmware, the USB controller reads the unique ID table of the memory and implements a program suitable for the manufacturer, capacity, and interface of the used memory.

1A and 1B are diagrams illustrating a USB composite device having a human interface device function, a wireless microphone function, and a removable storage device function according to the present invention.

2A and 2B are USB composite device block diagrams having human interface device functionality, wireless microphone functionality, and removable storage functionality in accordance with the present invention;

Figure 3 is a flow chart for the firmware in the receiver of the USB composite device according to the present invention

Figures 4a and 4b is a data frame structure for the RF interface of the radio interface and the human interface device and the transmitter according to the present invention

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

1, 31: laser module; 2, 20: microphone switch; 3, 26: microphone;

4: multi-directional switch; 5, 21: laser button; 6, 22: HID function button;

7, 23: HID function button; 8, 24: HID function button; 9,33: Battery capacity indicator

10: external microphone port 15, 42: speaker port; 16, 47: LED;

17: USB plug; 25: external microphone port 27: codec / compression;

28: an RF transmitter; 29: transmit antenna; 30: microcontroller;

32: battery; 40: PC; 41: USB port of PC; 43: codec / compression restore;

44: an RF receiver; 45: receiving antenna; 46: USB controller; 48: memory;

The present invention is largely divided into two parts, a transmitter and a receiver. The transmitter is equipped with a function button unit for implementing human interface functions such as a laser module for transmitting a laser beam, a mouse and a keyboard, a battery for supplying power to the transmitter, a microphone switch and a microphone for operating the microphone, and the overall operation of the transmitter. It consists of a microcontroller to control and an RF transmitter which modulates and transmits a digital signal. The receiver includes an RF receiver for converting the transmitted RF signal into a digital signal, a USB controller for controlling the RF reception signal processing and a USB interface for a composite device, an LED indicating operation status, a flash memory for storing data, or a small hard disk (HDD). And, characterized in that consisting of a USB connector connected to the USB port of the PC.

Hereinafter, the detailed description of the accompanying drawings are as follows.

1 shows a representative diagram of a transmitter and receiver system of the present invention. The transmitter system diagram of FIG. 1A shows a laser module 1, a microphone module 2 and a microphone operation switch 3, a multi-directional switch 4, a laser button 5, HID function buttons 6, 7, 8 And a battery capacity indicator 9 or the like. The laser module 1 is a module in which the laser beam is radiated by the pressing operation of the laser button 5, and the microphone module 2 is operated by the “ON” state of the microphone operation button 3, The other control buttons can be used to use the functions of the human interface device, and if a position control function such as a mouse is implemented, the trackpoint or touch pad can be used instead of the button or the multi-directional switch (4), otherwise Human interface device function buttons (6,7,8) using buttons or multi-directional switches (4) as wireless keyboard functions such as page up / down functions or arrow keys (arrow keys) wirelessly in applications such as presentations. It has a structure that performs specific functions such as finding a slide in an application such as PowerPoint. . The battery capacity indicator (9) is a part for informing the user of the remaining battery capacity of the transmitter through the LED color, and the external microphone port 10 is less sensitive to the transmitter built-in microphone or to use the transmitter close to the user's mouth It is a port that can be connected to an external microphone when it is difficult. The receiver system configuration diagram of FIG. 1B is composed of a speaker output port 15, an LED 16, and a USB connector 17. The speaker output port 15 is a part that detects a wireless microphone signal of a transmitter and directly connects to a speaker for voice output, and the LED 16 performs an operation of detecting an RF signal and notifying a flash memory or a small HDD access state. The USB connector 17 is a part for connecting with a PC through a USB controller of the receiver.

2 and 3 are block diagrams showing in detail the configuration of the transmitter and the receiver of the present invention.

The microcontroller 30 of FIG. 2 is responsible for the overall control of the transmitter. The microcontroller using the battery power 32 displays the remaining amount of the battery to the user through the remaining capacity indicator 33 of the battery, and checks the pressing state of each of the buttons 21 to 24 in the laser module 31. Emit a laser beam or encode mouse / keyboard values. Also, check the “ON / OFF” state of the microphone switch 20 to encode the audio signal input through the microphone 26 or the external microphone port 25 through the codec (A / D converter) and compression (27). The RF transmitter 28 transmits data to be transmitted wirelessly. Wireless microphone function that transmits voice signal has two methods of transmitting A / D converted data to RF through codec and digital data to RF using A / D conversion and compression. The RF transmitter 28 receives a voice signal from the microphone 26 or an external microphone port 25 or a mouse / keyboard function button signal from the microcontroller 30, modulates the signal into a wireless signal, and transmits the signal to a receiver through the transmission antenna 29. It plays a role. The USB controller of FIG. 3 is also responsible for the overall control of the receiver and the USB interface. Power is supplied from the PC 40 through the USB port 41. The RF receiver 44 which receives the RF signal through the reception antenna 45 and converts the RF signal into digital data performs the function in cooperation with the USB controller 46. The USB controller 46 detects the received RF signal, decodes the signal if it is an audio signal, outputs the audio to the speaker port 42 through the decompression codec 43, or sends the received audio signal to the PC through the USB. Use an audio device (sound card) to output. When using a PC audio device (sound card), software that transmits the audio signal transmitted through USB to the audio device (sound card) of the PC should be interlocked in the PC. In particular, the decompression processing can be performed using a decompression codec, a USB controller, or a PC application program. When the received RF signal is a mouse / keyboard function signal, the USB interface is used according to each command, and the removable storage device function is capable of storing data through the control of the memory 48 in the form of a flash or a small hard disk (HDD). And the LED 47 is turned on to inform each of the above operations.

4 shows a flowchart of the software of the receiver.

When the receiver is connected to the USB port of the PC for the first time (S1), it performs enumeration (S2) to exchange information about the USB composite device. Wireless human interface devices such as a mouse and keyboard, a portable storage device, and a wireless microphone device, which are implemented as a USB composite device, are transferred to a PC and recognized. In particular, this process reads the ID table of a flash memory or a small hard disk (HDD) and transmits the information to the PC, the manufacturer, the memory capacity, and the interface method. Run the appropriate firmware. If there is no problem through this process, the USB composite device is in a state capable of performing a desired operation in conjunction with a PC. The USB controller of the receiver performs most of operations in the interrupt (S3) method. In the main function, input / output and RF reception data signal processing of storage data are performed through various interrupt settings. The first thing to do in the main function is to determine whether there is access to the storage device (S4). If the access request is generated through the interrupt S3, after the read / write operation S9 is performed according to the access command of the requested storage device, the access request enters a state waiting for another interrupt. If an access command to the storage device is not requested, the RF reception data is processed (S5).

5 shows a data frame structure used in the RF interface of the transmitter / receiver.

As shown in Figures 5a and 5b, the data format used in the RF transmission and reception is largely divided into two parts. It is classified according to whether the wireless microphone function is performed. In the absence of voice data, the control signal is referred to as “synchronous signal + ID + data code + (CRC)” because only a relatively small amount of data is transmitted as a control signal of the human interface device. The data frame is achieved only by the command for. However, when voice data is transmitted, the amount of data is so large that it is transmitted in a frame in the form of "synchronization signal + ID + data code + voice data block + (CRC)". The sync signal is a pattern indicating the start of a data frame, and is used at the start of a frame. The ID is used to distinguish each user when multiple users exist or to indicate the physical channel number used when using multiple channels. The data frame is used to indicate whether it is a control command or wireless microphone data for the human interface device, and the voice data block is a voice signal from the wireless microphone. The voice data block is transmitted by dividing the voice signal into predetermined units, and a cyclic redundancy check (CRC) is used to correct an error that may occur in the transmitted data. In order to share the wireless channel with other users, the data should be transmitted using the frequency band only for a short time, and when the voice data gets longer, the synchronization problem occurs. Will have to have. In order to prevent collision with other wireless channel users, when selecting a wireless channel, it can be used after determining whether the channel is in use by another user, and if the channel is bad or has a problem, the channel can be changed automatically. It has a structure. In the structure of the wireless data format, the receiver performs only a command corresponding to the unique ID through the ID. If the ID is continuously input without the ID storage (S6), the receiver stores it (S10) and stores it in the USB port of the PC. Only commands in frames with this ID until detached. If the ID is stored (S6), it is determined whether the received RF data matches the ID (S7). If the ID is matched, the data after the ID is received again to determine whether the data is valid (S8). If the IDs do not match, return to the main function and wait for the interrupt. In addition to the ID, there are various kinds of data codes received. When operated as a mouse it will be the data code for the mouse, when it is operated as a keyboard it will be the data code for the keyboard, and when it is operated as a microphone it will be the voice data code. Because the receiver implements a USB composite device, there can be many kinds of wireless data. Therefore, it is necessary to confirm what kind of data the data received together with the ID is, and thus perform different operations. The method of classifying data codes analyzes the coded values in the data code format and processes them as data corresponding to each operation. If the data code format of the RF signal received in this manner is valid data S8, the process of the data code is performed (S11), and if it is not valid, the process returns to the main function, and if it is not valid, it returns to the main function without data processing. If the data is interpreted from the valid data and the voice data is received, the data is received in a unit of block unit, and the voice is processed through the speaker port or the PC. If the data is not the voice data, the data code is analyzed and the corresponding command is executed. Perform.

The present invention is a device that implements a human interface device such as a USB keyboard / mouse, a removable storage device, and a microphone device using a single controller. The present invention provides a presentation program and a laser pointer for conferences, lectures, and lectures. In this case, not only can the presentation be stored on this unit, but the presenter can also use a wireless microphone, and the mouse and keyboard can be used wirelessly to help the presenter effectively lead the presentation without the assistance of an assistant. In addition, the present invention may use only the functions of the removable storage device when the user does not use it in the presentation using the presentation, and when using a small hard disk (HDD) as a memory, the memory of a larger capacity than the general flash memory is provided. can do. The USB controller reads the unique ID table of the memory used to determine the memory manufacturer, memory capacity, memory interface, etc., and can control various types of memory with a single firmware. In addition, based on the invention of the USB composite device, it is expected that other types of USB composite devices may be implemented by adding functions desired by the users.

Claims (15)

The unique code corresponding to each button is generated by the laser module that emits the laser beam from the laser pointer by the laser button, the wireless microphone module that converts the voice into an RF signal, and the microcontroller that receives the function button input of the human interface device. Implement a human interface device such as a keyboard / mouse that extracts a unique code from the converted digital data, an RF receiver that converts an RF signal transmitted wirelessly into digital data, a transmitter that is modulated by an RF signal, and is transmitted. The ability to simultaneously read / write data to and from the flash memory, extract the wireless microphone signal to the speaker, or transfer it to a PC via the USB interface for voice output or to save as voice data, and Interface with a PC using a USB port System consisting of a firmware implementation of an internal receiver capability The method of claim 1, further comprising: extracting a control command for each button sent by the transmitter and converting it into a function of a human interface device such as a keyboard / mouse to communicate with a PC; and receiving wireless voice data transmitted from a microphone of the transmitter. Receiver structure and system with USB composite device that simultaneously outputs to speaker or outputs voice and data files through USB interface, and also functions as a removable storage device that can read / write data The structure of claim 1, wherein the receiver has a USB composite device structure that can implement a function such as a human interface device / removable storage device / wireless microphone device using a single USB controller, and a USB hub. System that can have two structures of USB Compound Device that implements the above functions by connecting controllers that perform each function. The transmitter of claim 1, wherein the transmitter may implement a position control function such as a mouse by using a trackpoint or a touch pad, and implement a function on a human interface device other than a position control command by using a button or a multi-directional switch. System As shown in FIG. 5, the transmission data frame structure of the transmitter forms a frame structure including a synchronization pattern indicating the start of transmission data, an ID for distinguishing a user, a data code pattern, and a CRC code for error correction. In the case of a wireless microphone, a block of voice data blocks divided into predetermined units are added after the data code pattern, and the transmitter can distinguish which function the data transmitted through the data code means. The receiver analyzes data code patterns and implements mouse functions, keyboard functions, and wireless microphones according to the corresponding functions. A system that can implement other types of USB composite devices by adding code in the interface descriptors for wireless human interface devices such as mice and keyboards, removable storage devices, and other features that you want to add in addition to wireless microphone devices. The transmitter has a built-in wireless microphone function that can transmit voice data, which can be output using the wireless microphone function via the speaker output port using the receiver's USB controller or voice codec, or via the PC's sound card via the USB interface. System for storing voice data The wireless microphone function of the transmitter is a method of compressing data transmitted through a codec (A / D converter) and transmitting the RF signal as an RF signal after the voice signal is converted by the microphone and a codec (A / D converter). There are two ways to transmit voice data as RF signal without compression, and the receiver can distinguish whether or not the voice signal is compressed, and if it is not compressed, restore the voice through D / A converter. System, which uses a decompression codec, USB controller, or a PC application to restore the audio using a D / A converter if compressed. The method of claim 7, wherein when using the human interface device and the wireless microphone function through the assigned wireless channel, the channel is selected after determining whether the channel is used by another user when selecting a wireless channel to avoid collision with other users. The system can automatically switch to another channel if the channel becomes bad or has a problem while in use. 8. A system according to claim 7, wherein the battery remaining capacity of the transmitter can be indicated by two or three LEDs to inform the user that battery consumption is expected to be high due to the transmitter's wireless microphone function. 8. The system of claim 7, wherein an external microphone port is configured in the transmitter to connect and use an external microphone when the transmitter built-in microphone is less sensitive or when the transmitter is difficult to use close to the user's mouth. 8. The type of wireless microphone switch of a transmitter according to claim 7, wherein the type of the wireless microphone switch of the transmitter is placed in the "ON" state by using a switch of the "ON / OFF" type, and at the same time freely using the radio control commands of the human interface device while using the microphone. Configured to help Efficient system not only can use the present invention in presentation applications such as PowerPoint, but also can be used by end users as removable storage devices In the present invention, the memory portion used as a removable storage device is not only a flash type memory but also a system capable of dramatically increasing the storage capacity by using a small hard disk (HDD). The USB controller reads the unique ID table of the used memory (flash memory or small hard disk) and uses a variety of firmware structured so that each program can be executed according to the manufacturer, capacity, and interface information stored therein. System implemented to control kinds of memory