1. Field of the Invention
This invention relates to a wireless network device provided with two functional mode and method of switching for the same, and more particularly to a switching determination according to a source of the power received by the wireless network device.
2. Description of Related Art
Thanks to a public wireless network gradually being created everywhere, users have increasing chances to use wireless local area network (WLAN) in public places. Users do not, however, actually carry out wireless networking at all times, everywhere. They must turn on devices provided with a wireless networking function, such as, for example, a PDA or a portable computer, to determine whether a wireless network signal is present through a wireless network utility working with an internal or external wireless network device prior to use of the wireless networking service.
A general external wireless network device, as shown in U.S. Pat. No. 6,633,583, is a wireless communication receiver using a universal serial bus (USB) as an interface, in which a signal conversion circuit is used to convert a wireless signal received from an RF module into a signal based on USB protocol, or convert and transfer a digital signal based on USB protocol to the RF module, and then send out the signal through an antenna.
As shown in
However, in view of the single function and structure provided in the wireless module and the lack of a full layout of wireless network, it is complicated and inefficient to detect the network signals.
The object of the invention is to provide a wireless network device which is able to switch into a first functional mode or a second functional mode according the source of the power.
In order to achieve the above object, a wireless network device is provided for switching into a first and a second functional mode according to the source of received power. The wireless network device includes a wireless network communication module, a processor, a power module, and a voltage regulator. The wireless network communication module is utilized for transceiving wireless network signal, and the processor is connected to the wireless network communication module. The power module selectively receives a power from one of a battery and a computer. The voltage regulator is connected to the processor, for selectively switching into the first functional mode when receiving the power form the battery, or switching into the second functional mode when receiving the power from the computer.
For example, in a preferred embodiment, the first functional mode is a wireless network signal detection mode, while the second functional mode is a wireless NIC mode. When the wireless network device receives the power from the battery, the wireless network device switches into wireless network signal detection mode, to scan the wireless network signals independently without being connected to a computer and finally gives a result.
The foregoing aspects and many of the attendant advantages of this invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
In this invention, a wireless network device provided with a first functional mode and a second functional mode is disclosed. The first functional mode is wireless signal detection mode, while the second functional mode is wireless NIC mode. A detection module for detecting wireless signals is provided in addition to the conventional wireless device, and the device is designed with a voltage determination mechanism to switch the device functions according to different load voltage types.
As shown in
When the wireless network device 20 is connected to a PC 27 through a USB interface port 21, as shown in
Referring to
Further, in order to detect the wireless network signal, the detection module 34 is connected to the baseband module 303 of the wireless network communication module 30, and after the antenna module 301 receives the wireless signal, the detection module 34 eliminates background noise and ambient interference accompanying the signal and meanwhile adjusts the detection range to determine the source of the signal.
The wireless network communication module 30 is connected to the processor 36 to convert the wireless signal received by the wireless network communication module 30 into a digital signal and then transmit the same to the PC or transmit the digital signal to the wireless network device 20 from the PC through the interface unit 33. The processor 36 then converts the signal into an RF signal and transmits the same from the wireless network communication module 30. The indication unit 37 is connected to the processor 36, and the processor 36 converts the detection result into electric power to drive the indication unit 37 in the embodiment, such as the indicating lamp in
The voltage regulator 31 is connected to the processor 36 and the power module 32 to receive the message of load voltage and then determine the functions of switching with the load voltage passing through the device, such as a wireless network mode or a wireless network signal detection mode. The power module 32 is connected to an internal or external battery 35 or an interface unit 33 to manage the power of device, in which the interface unit 33 is a USB, IEEE1394, or PCMCIA (Personal Computer Memory Card International Association) interface to the PC. When the wireless network device 20 according to this invention works independently, the battery 35 is the power source; at this time the voltage regulator 31 determines the load voltage of the device and then switches to the wireless network signal detection mode. When the device is connected to the PC through the interface unit 33, it switches to the wireless NIC mode. At this time the PC supplies electric power. With the switching mechanism, the versatile wireless network device that detects the network signal without the PC's help is achieved.
After the device is turned on by the switch, the signal indicating device shows the wireless network signal, strength thereof, or the wireless network identification message. The signal indicating device is, for example, an LED-based indicating lamp or an LCD, or is implemented as a sound, a vibration, or a combination of the implementations mentioned above.
In a flow chart shown in
In step S505, if the power is received from the PC, the load voltage is not less than the determination value, switching to the wireless NIC mode (the first functional mode) is implemented (step S507). And if the power is received from the battery, the load voltage is less than the determination value, switching to the wireless network signal detection mode is implemented (step S509). At this time, the wireless network device is supplied with less voltage by the battery, and works independently to detect the wireless network signal. The scale of voltage, however, is determined mainly by actual operation, so it is not limited by the embodiment.
Next, the processor asks the baseband module to detect the wireless network signal (step S511). The wireless network communication module especially scans the wireless network signal (step S513), and receives feedback packets in a specified time to detect and then determine upon the received signals whether the wireless network signal exists (step S515). A result is submitted (step S517), and the feedback packets sent from the baseband module are returned to the processor to eliminate background noise and ambient interference accompanying the signal and detect the range for determination of the source of the signal and the wireless network signal (step S519). Finally, the processor shows the result on the indication unit to inform a user of the status of wireless network signal (step S521).
The accompanying drawings in the embodiments are provided for reference and illustration only and not intended to limit the terms or scope of this invention.
To sum up, this invention is a wireless network device provided with a signal detection function and method of switching for the same. The device switches the wireless network module upon the load voltage to the general wireless NIC mode or the wireless network signal detection mode for achievement of multiple functions. However, in the description mentioned above, only the preferred embodiments according to this invention are provided without limit to claims of this invention; all those skilled in the art without exception should include the equivalent changes and modifications as falling within the true scope and spirit of the present invention.
Number | Date | Country | Kind |
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094113321 | Apr 2005 | TW | national |
The present application is a continuation-in-part application of U.S. patent application Ser. No. 11/195,710, filed on Aug. 3, 2005, which is hereby incorporated by reference.
Number | Date | Country | |
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Parent | 11195710 | Aug 2005 | US |
Child | 12176579 | US |