Patents Assigned to Terax Communication Technologies Inc.
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Patent number: 7509121Abstract: A method of updating firmware using the object push profile in the bluetooth object exchange protocol is proposed. This method first makes use of a bluetooth transmitter to connect a bluetooth electronic device whose firmware is to be updated and a host storing a new program code. Next, the bluetooth transmitter checks parameters in an EEPROM of the bluetooth electronic device to determine whether it is necessary to update the firmware. Through the object push profile (OPP) in the object exchange (OBEX) protocol of the bluetooth technology, this new program code is reprogrammed to a flash memory in the bluetooth electronic device. After the end of the reprogramming action, the bluetooth connection between the bluetooth electronic device and the host is cut off to finish firmware update of the bluetooth electronic device.Type: GrantFiled: April 18, 2005Date of Patent: March 24, 2009Assignee: Terax Communication Technologies Inc.Inventors: Zheng-Liang Lin, Jinn-Ja Chang
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Patent number: 7043513Abstract: The present invention generally relates to provide a clock balanced segmentation digital filter, which is provided with an optimum area of a data path. The digital filter includes a controlling unit, which is connecting with a register, a multiplexer unit, and an arithmetic and logic unit. The present invention utilizes the controlling unit to initialize the filter parameter stored in the register and to segment the whole logic operation procedure to a plurality of operation steps and to arrange the operation procedure. The multiplexer unit is connecting with the register and the arithmetic and logic unit. The multiplexer unit controlled by the controlling unit is choosing the require parameter and data to output into the arithmetic and logic unit to perform the operation. The operation result is stored in the register for using as the following operation parameter. The present is provided with advantages of scaling down the area of logic circuit, low power consumption and rapid operation.Type: GrantFiled: August 9, 2002Date of Patent: May 9, 2006Assignee: Terax Communication Technologies, Inc.Inventor: Ruey-Feng Chen
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Patent number: 7035603Abstract: A wireless transmitter is proposed. First, a ROM having a lookup table therein is provided. The lookup table is used to store a plurality of IF modulation signals so that a state machine can select a corresponding IF modulation signal from the lookup table of the ROM according to loaded data and output a digital IF modulation signal to a DAC, which then converts the digital IF modulation signal into an analog IF modulation signal to be filtered by a low pass filter. Finally, a local oscillator is utilized to modulate the filtered analog IF modulation signal to an emission frequency, hence obtaining an RF signal. The transmitter makes use of a time-sharing way to use a local oscillator together with the receiver. Complexity of device can thus be simplified to meet the requirement of compactness of wireless products.Type: GrantFiled: February 26, 2003Date of Patent: April 25, 2006Assignee: Terax Communication Technologies, Inc.Inventors: Jinn-Ja Chang, Dung-Yun Chen
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Patent number: 6933776Abstract: There is provided a signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator. The method utilizes at least a detect circuit respectively detecting and collecting a positive edge signal and a negative edge signal of an intermediate frequency signal. Then, two n-bit ripple counters are utilized to refer to a threshold value and then receiving the positive and negative edge signal as a switch signal to reset the threshold value as an initial value of counters so as to start to count and compare to output a positive edge data bit and a negative edge data bit. Last, a hard decision logic circuit is used to perform a frequency-descending decision in accordance with the positive and negative edge data bit so as to send a base frequency signal. The method can decrease the logic gate counts, shorten the signal delay time, and increase the resolution of the demodulation.Type: GrantFiled: March 18, 2003Date of Patent: August 23, 2005Assignee: Terax Communication Technologies Inc.Inventors: Jen-Sheng Huang, Yaw-Guang Chang, Li-Cheng Hsu, Jinn-Ja Chang
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Patent number: 6727748Abstract: The present invention discloses a highly efficient constant transconductance power amplifier. an embodiment of the invention comprises a positive error amplifier, a negative error amplifier, four current sources, two differential current controllers, and a constant gm biasing circuit. The amplifiers are used with deliberate offset voltages in order to make two transconductance amplifiers which serve in the positive and negative cycle in order to turn on in the appropriate cycle properly. Positive current sources are current outputs while negative current sources sink the current. The current sources provide current to the current controllers. The differential current controllers control the amount of current from the current source flowing to the load. This is proportional to the differential input signal. The constant transconductance biasing circuit provides the transconductance amplifiers with stable biasing voltage. This eliminates any drift associated with process variation.Type: GrantFiled: May 9, 2002Date of Patent: April 27, 2004Assignee: Terax Communication Technologies Inc.Inventor: Wen-Kai Kuo