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1. 发明专利

JP2001159969A AUTOSWITCH FOR RISER CARD 失效
公开(公告)号：JP2001159969A
公开(公告)日：2001-06-12
申请号：JP2000299151
申请日：2000-09-29
申请人： PCTEL INC
发明人： MAZZARINI ANTHONY L
IPC分类号： G06F13/00 , G06F3/16 , G06F13/40
摘要： PROBLEM TO BE SOLVED: To provide a circuit to automatically constitute a riser card compatible with AC'97 specification for a computer with or without a main encoder/decoder. SOLUTION: The riser card compatible with the AC'97 specification detects whether the main encoder/decoder exists on an AC-link interface or not and constitutes an encoder/decoder on the riser card according to the detection result. An autoswitch sets the encoder/decoder to be actuated as the main encoder/decoder when no other main encoder/decoder exists and sets the encoder/decoder to be actuated as a sub encoder/decoder when the AC link-interface has the main encoder/decoder. In one kind of embodiment of the autoswitch, a signal PRIMARY-DN# from the AC-link interface is used as a selection signal to select an ID number of the encoder/decoder and a route of a data signal from the encoder/decoder to the AC-link interface.

2. 发明专利

JP2000156739A SYSTEM AND METHOD FOR REMOTELY CONTROLLING/DIAGNOSING MODEM 失效
公开(公告)号：JP2000156739A
公开(公告)日：2000-06-06
申请号：JP22406099
申请日：1999-08-06
申请人： PCTEL INC
发明人： BARRETT RONALD LAURENCE SR
IPC分类号： H04L29/10 , H04L12/26 , H04M11/00 , H04M11/06
摘要： PROBLEM TO BE SOLVED: To remotely control a modem by operating a remote diagnostic unit through using remote control software, which is installed on both of a control computer and the remote diagnostic unit, thereby testing a test modem, comparing the test modem with a reference modem, correcting it and installing new modem software on the remote diagnostic unit. SOLUTION: A modem connection of the remote diagnostic unit RDU 1 with a control modem 11 is formed via a control line 7a, a power control unit 9, a control line 7b by using a control modem 5 of a control computer 3. An instruction for connecting with an outgoing line 19 is given to the RDU 1 by using the reference modem 15 first, a test modem 13 next, and performance of the test modem 13 is monitored by comparing the test modem 13 with the reference modem 15 by an operator. When the test modem 13 is an HST modem, a function of the HST modem is changed by installing the new software on the RDU 1.

3. 发明专利

JPH11340877A ADAPTIVE DC COMPENSATOR 失效
公开(公告)号：JPH11340877A
公开(公告)日：1999-12-10
申请号：JP926299
申请日：1999-01-18
申请人： PCTEL INC
发明人： MIRFAKHRAEI KHASHAYAR
IPC分类号： H03H21/00 , H04B3/04 , H04L25/06
摘要： PROBLEM TO BE SOLVED: To compensate for the drift of a baseline by predicting and compensating the shift amounts of the base line of a received signal by using a multi-tap filter, and changing a filter coefficient in accordance with the error of a preceding predicted result. SOLUTION: An adder 210 adds predicted shift S' from an adaptive DC compensator 138 to a sample Rx' constituted of a transmission signal Tx- baseline shift S, and generates a compensated level Tx'. A slicer 139 converts the compensated level Tx' into a symbol level Tx in a 208 level suited to a protocol and outputs it. An adder 230 calculates the difference between the symbol level Tx equivalent to error amounts ΔS in the case of uncorrected base line shift, that is, predicted shift S' and the corrected level Tx'. An adaptive FIR filter 240 and an integrator 250 generate new predicted shift S' from the previous predicted shift S' by several number of times and the uncorrected shift ΔS.

4. 发明专利

JPH1155415A FORMATION OF BAND PASS SPECTRUM FOR DATA SIGNAL 失效
公开(公告)号：JPH1155415A
公开(公告)日：1999-02-26
申请号：JP5076398
申请日：1998-03-03
申请人： PCTEL INC
发明人： YEH HAN C
IPC分类号： H04M11/00 , H04L25/49
摘要： PROBLEM TO BE SOLVED: To reduce a distortion problem in a high frequency and a low frequency by processing a sample in a PCM signal and permitting the both of a DC indicator in an analog, that is, PAM signal and a high frequency indicator expressing the highest frequency component to be min. SOLUTION: In a communication system for exchanging a series of data codes, a PCM encoder 126 in a transmitter 124 receives data from a database 110, dissolves the data into a series of multi-bit codes and maps the respective codes to PCM sample values. A sample selecting circuit 128 in the transmitter 124 transmits the PCM sample values of the ones being alternative, that is, substitutive as against the PCM samples from the PCM encoder 126 to the respective PCM sample values from the PCM encoder 126. A class of substitutives being usable for selection depends on an encoding method to be used.

5. 发明专利

JPH0926944A COMMUNICATION INTERFACE USING SOFTWARE SIMULATION OF UART AND PREVENTION OF CONFLICT 失效
公开(公告)号：JPH0926944A
公开(公告)日：1997-01-28
申请号：JP10499896
申请日：1996-04-25
申请人： PCTEL INC
发明人： CHEN PETER C
IPC分类号： G06F13/14 , G06F13/10 , G06F13/36 , G06F15/16 , G06F15/177 , G06F15/163
摘要： PROBLEM TO BE SOLVED: To provide a computer system capable of supplying the merit of a standard UART interface to a non-standard device. SOLUTION: The computer systems is provided with software UART emulation and uses a standard operating system protocol for minimizing the possibility of I/O contention between a serial device 105 provided with the UART and a non-standard serial device 205 for performing communication through the UART emulation. A COM driver capable of replacing a standard COM driver in an operating environment is provided with the UART emulation. The COM driver decides the device address of a COM port I/O slot used by the UART further, sends a prescribed pattern on an ISA bus so as to indicate that the device address is to come, then supplies a value for indicating the device address not used by the UART and thus, sets the device address of the non-standard device on the ISA bus.

6. 发明专利

JP2007288789A Method of detecting predetermined sequence in radio frequency signal using combination of correlation and fft 审中-公开
标题翻译：使用相关和FFT组合检测无线电频率信号中预测序列的方法
公开(公告)号：JP2007288789A
公开(公告)日：2007-11-01
申请号：JP2007109013
申请日：2007-04-18
申请人： Pctel Inc , ピーシーテルインコーポレイテッド
发明人： LU WEI
CPC分类号： G01S19/30 , H04B1/7075 , H04B1/70752 , H04B2201/70715
摘要： PROBLEM TO BE SOLVED: To accomplish techniques for surely recognizing a predetermined synchronous (training) sequence within a radio frequency signal in an environment where it is difficult to accomplish the techniques only with correlation techniques.
SOLUTION: A reference sequence is constituted of the steps of correlating the reference sequence with a sequence of elements of the radio frequency signal received on the Doppler faded radio frequency channel and of detecting the predetermined sequence within the received signal when a cumulative power level of subsequences of the correlated sequence exceeds a predetermined power level threshold.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：为了完成在仅通过相关技术难以完成技术的环境中确定地识别射频信号内的预定同步（训练）序列的技术。解决方案：参考序列由以下步骤组成：将参考序列与在多普勒褪色射频信道上接收的射频信号的元素序列进行相关并且当累积功率检测到接收信号中的预定序列时，相关序列的子序列的级别超过预定功率电平阈值。版权所有（C）2008，JPO＆INPIT

7. 发明专利

JP2001045089A VIRTUAL 16550 UART 失效
公开(公告)号：JP2001045089A
公开(公告)日：2001-02-16
申请号：JP2000167342
申请日：2000-06-05
申请人： PCTEL INC
发明人： LUO XIAOHUA
IPC分类号： G06F13/10 , H04L29/02
摘要： PROBLEM TO BE SOLVED: To emulate a hardware UART through a software program by allowing a callback procedure of a computer system to return a value returned by the hardware UART in response to read of an instruction from an address relating to a communication port. SOLUTION: An operating system 132 calls an I/O callback procedure 138 in response to an access to a COM port corresponding to a MODEM 136. The callback procedure 138 replies the access like a 16550 UART and records a written value (e.g. 0xc1) in response to the write to an FIFO control register(FCR). The callback procedure 138 replies a succeeding read of the FCR and returns the written value (e.g. 0xc1). A program interprets a response of the callback procedure 138 so as to be the response suitable for the 16550 UART and discriminates that the MODEM 136 includes the 16550 UART.

8. 发明专利

JPH11317789A HOST SIGNAL PROCESSING MODEM USING SOFTWARE CIRCULATING BUFFER AND DIRECT SAMPLE TRANSFER FOR MAINTAINING COMMUNICATION SIGNAL 失效
公开(公告)号：JPH11317789A
公开(公告)日：1999-11-16
申请号：JP1435499
申请日：1999-01-22
申请人： PCTEL INC
发明人： YEH HAN C
IPC分类号： G06F13/00 , H04L13/08 , H04L29/08 , H04L29/10 , H04L29/14 , H04M11/06
摘要： PROBLEM TO BE SOLVED: To provide a host signal processing communication system which can maintain a communication link. SOLUTION: The invented host signal processing(HSP) communication system has a host computer 10 which executes the software part of an HSP modem and a device including a digital-analog converter(DAC) 137. In response to an interrupt, the host executes an update routine which generates and writes a sample to a software circulating buffer in a memory of the host computer 110. The sample represents the amplitude of an analog signal based upon a desired communication protocol. Through direct transfer, the sample is moved from the software circulating buffer to a hardware circulating buffer and the DAC 137 converts the sample into an analog communication signal from the hardware circulating buffer.

9. 发明专利

JP2008245253A Iterative pilot aided frequency offset estimation and c/i measurement for tdma signal with offset larger than nyquist frequency of the reference symbol rate 有权
标题翻译：迭代引导频率偏移估计和C / I测量用于TDMA信号的偏移量超过参考符号率的NYQUIS频率
公开(公告)号：JP2008245253A
公开(公告)日：2008-10-09
申请号：JP2008022747
申请日：2008-02-01
申请人： Pctel Inc , ピーシー − テル,インコーポレイテッド
发明人： SRIVASTAVA VIKASH , CHEN MENG
IPC分类号： H04L7/00 , H04B7/005 , H04J3/00
CPC分类号： H04L27/0014 , H04L2027/0034 , H04L2027/0065 , H04L2027/0093
摘要： PROBLEM TO BE SOLVED: To provide a method and apparatus for decoding a wireless signal from a set of samples with an embedded training sequence. SOLUTION: The method includes steps of determining a first frequency offset from the samples where the first frequency offset is assumed to be less than a Nyquist frequency of the training sequence, and calculating a first carrier to interference ratio based on the first frequency offset. The method further includes steps of determining a second frequency offset from the samples by subtracting an absolute value of the first frequency offset from an integer multiple of the Nyquist frequency and giving the second frequency offset a sign opposite to that of the first frequency offset, calculating a second carrier to interference ratio based on the second frequency offset, and selecting one of the first and second frequency offsets based on relative values of the calculated carrier to interference ratios. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于从具有嵌入训练序列的一组样本中解码无线信号的方法和装置。解决方案：该方法包括以下步骤：从假设第一频率偏移小于训练序列的奈奎斯特频率的样本确定第一频率偏移，并且基于第一频率计算第一载波干扰比抵消。该方法还包括以下步骤：通过从奈奎斯特频率的整数倍减去第一频率偏移的绝对值并给出第二频率偏移与第一频率偏移相反的符号来确定来自采样的第二频率偏移，计算基于第二频率偏移的第二载波干扰比，并且基于所计算的载波与干扰比的相对值来选择第一和第二频率偏移中的一个。版权所有（C）2009，JPO＆INPIT

10. 发明专利

JP3759234B2 Communication interface and conflict avoidance using a software simulation of Uart 失效
公开(公告)号：JP3759234B2
公开(公告)日：2006-03-22
申请号：JP10499896
申请日：1996-04-25
申请人：ピーシーテル, インコーポレイテッドPctel, Inc.
发明人：シー．チェンピーター
IPC分类号： G06F13/00 , G06F13/14 , G06F13/10 , G06F13/36 , G06F15/16 , G06F15/177
CPC分类号： G06F13/105

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