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1. 发明授权

US06067332A Frequency searching method and digital audio broadcast receiver 失效
标题翻译：频率搜索方法和数字音频广播接收机
公开(公告)号：US06067332A
公开(公告)日：2000-05-23
申请号：US73353
申请日：1998-05-06
申请人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Masakazu Morita
发明人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Masakazu Morita
IPC分类号： H04J11/00 , H03J1/00 , H03J7/02 , H03J7/28 , H04L27/06
CPC分类号： H03J7/285 , H03J1/0041 , H03J1/0066 , H04H60/43 , H04H2201/20
摘要： A digital audio broadcast receiver searches for a receivable digital audio broadcast signal by first searching for a signal, having at least a predetermined power level, in which frame synchronization symbols can be detected. This stage of the search is made by searching a known frequency grid, or by scanning in steps approximately equal to the bandwidth of the digital audio broadcast signal. After frame synchronization symbols have been detected, the receiver attempts to find the center frequency of the received signal, changing the receiving frequency in steps less than the bandwidth of the digital audio broadcast signal, if necessary. A prompt indication that a receivable digital audio broadcast signal has been found is given when frame synchronization symbols are detected, or when the center frequency is found.
摘要翻译：数字音频广播接收机通过首先搜索具有至少预定功率电平的信号来搜索可接收数字音频广播信号，其中可以检测帧同步符号。通过搜索已知的频率网格或通过大致等于数字音频广播信号的带宽的步骤的扫描来进行搜索的这个阶段。在检测到帧同步符号之后，如果需要，接收机尝试找到接收信号的中心频率，以小于数字音频广播信号的带宽改变接收频率。当检测到帧同步符号时，或当发现中心频率时，给出已经发现可接收的数字音频广播信号的提示。

2. 发明授权

US06341123B1 Digital audio broadcasting receiver 失效
标题翻译：数字音频广播接收机
公开(公告)号：US06341123B1
公开(公告)日：2002-01-22
申请号：US09015768
申请日：1998-01-29
申请人： Masahiro Tsujishita , Masayuki Ishida , Kenichi Taura , Tadatoshi Ohkubo , Masakazu Morita
发明人： Masahiro Tsujishita , Masayuki Ishida , Kenichi Taura , Tadatoshi Ohkubo , Masakazu Morita
IPC分类号： H04L2706
CPC分类号： H04L27/2657 , H04H40/18 , H04H2201/20 , H04L27/2679
摘要： A digital audio broadcasting receiver comprises a phase error detector for detecting a phase error from data from a differential demodulator, an average value processing unit for determining the average value of phase errors, a memory for storing the phase errors of the carriers outputted from the phase error detector, and a phase error correcting unit which excludes a phase error whose sign is opposite to that of the average value among the phase errors stored in the memory, and determined the average value of phase errors again, thereby making it possible to obtain a phase error signal which is less affected by leakage from other carriers.
摘要翻译：数字音频广播接收机包括：相位误差检测器，用于从差分解调器的数据中检测相位误差;平均值处理单元，用于确定相位误差的平均值;存储器，用于存储从相位输出的载波的相位误差误差检测器和相位误差校正单元，其排除与存储在存储器中的相位误差中的平均值相反的相位误差，并且再次确定相位误差的平均值，从而可以获得相位误差信号受到其他载波泄漏的影响较小。

3. 发明授权

US6151369A Digital broadcast receiver 失效
标题翻译：数字广播接收机
公开(公告)号：US6151369A
公开(公告)日：2000-11-21
申请号：US44862
申请日：1998-03-20
申请人： Tadatoshi Ohkubo , Masahiro Tsujishita , Kenichi Taura , Masayuki Ishida , Masakazu Morita
发明人： Tadatoshi Ohkubo , Masahiro Tsujishita , Kenichi Taura , Masayuki Ishida , Masakazu Morita
IPC分类号： H04L27/18 , H03J7/04 , H04B1/16 , H04B1/30 , H04H20/00 , H04H40/18 , H04J11/00 , H04L27/26 , H04L27/22
CPC分类号： H04H40/18 , H03J7/04 , H04B1/30 , H04L27/2657 , H04L27/2675
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal to obtain an array of complex values, selects several sets of values from the array, multiplies each selected value by the complex conjugate of a value offset by N positions in the array (where N is a fixed integer that may be equal to zero), averages the results in each set, takes differences between the average values, or between sums of these average values, thereby obtains two difference values, and calculates a frequency offset from the difference values. Each set of values is taken from positions at which the known reference-symbol values satisfy certain conditions in relation to the known values at adjacent positions.
摘要翻译：为了控制本地振荡器的振荡频率，数字广播接收机解调包含在正交频分复用广播信号中的相位参考符号以获得复数值阵列，从阵列中选择若干组值，值由数组偏移N个位置的值的复共轭（其中N是可以等于零的固定整数），对每个集合中的结果进行平均，取平均值之间或这些平均值之和值，从而获得两个差值，并且从差值计算频率偏移。每组值取自已知参考符号值相对于相邻位置处的已知值满足某些条件的位置。

4. 发明授权

US6028900A Digital broadcast receiver 失效
公开(公告)号：US6028900A
公开(公告)日：2000-02-22
申请号：US861072
申请日：1997-05-21
申请人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Yoshiharu Ohsuga
发明人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Yoshiharu Ohsuga
IPC分类号： H04L27/22 , H04J11/00 , H04L1/00 , H04L27/26 , H04L27/06
CPC分类号： H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675 , H04L27/2679 , H04L1/0054
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal, modifies the resulting frequency-domain data by multiplication with complex conjugates of known data encoded in the phase-reference signal, under different assumed frequency offsets, converts the modified data to time-domain data, and thereby detects a first frequency error equal to a multiple of the subcarrier spacing and a second frequency error not exceeding the subcarrier spacing. Differential phase error is also detected. The oscillation frequency is adjusted to correct the first frequency error and differential phase error; then the second frequency error is used to correct for ambiguity in the differential phase error.

5. 发明授权

US6148045A Digital broadcast receiver 失效
标题翻译：数字广播接收机
公开(公告)号：US6148045A
公开(公告)日：2000-11-14
申请号：US395154
申请日：1999-09-14
申请人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Yoshiharu Ohsuga
发明人： Kenichi Taura , Masahiro Tsujishita , Tadatoshi Ohkubo , Masayuki Ishida , Yoshiharu Ohsuga
IPC分类号： H04L27/22 , H04J11/00 , H04L1/00 , H04L27/26 , H04L27/06
CPC分类号： H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675 , H04L27/2679 , H04L1/0054
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal, modifies the resulting frequency-domain data by multiplication with complex conjugates of known data encoded in the phase-reference signal, under different assumed frequency offsets, converts the modified data to time-domain data, and thereby detects a first frequency error equal to a multiple of the subcarrier spacing and a second frequency error not exceeding the subcarrier spacing. Differential phase error is also detected. The oscillation frequency is adjusted to correct the first frequency error and differential phase error; then the second frequency error is used to correct for ambiguity in the differential phase error.
摘要翻译：为了控制本地振荡器的振荡频率，数字广播接收机解调包含在正交频分多路复用广播信号中的相位参考符号，通过与在相位中编码的已知数据的复共轭进行乘法来修改所得到的频域数据 - 参考信号，在不同的假定频率偏移下，将修改的数据转换为时域数据，从而检测等于子载波间隔的倍数的第一频率误差和不超过子载波间隔的第二频率误差。还检测到差分相位误差。调整振荡频率以校正第一频率误差和差分相位误差; 则使用第二频率误差来校正差分相位误差中的歧义。

6. 发明授权

US06516039B1 Digital audio broadcast receiver acquiring frame synchronization quickly in the presence of noise 有权
标题翻译：数字音频广播接收机在存在噪声的情况下快速获取帧同步
公开(公告)号：US06516039B1
公开(公告)日：2003-02-04
申请号：US09263796
申请日：1999-03-05
申请人： Kenichi Taura , Tadatoshi Ohkubo , Masayuki Ishida , Masakazu Morita
发明人： Kenichi Taura , Tadatoshi Ohkubo , Masayuki Ishida , Masakazu Morita
IPC分类号： H04L700
CPC分类号： H04H40/18 , H04H2201/20
摘要： A digital audio broadcast receiver detects frame synchronization signals, measures the pulse widths of and intervals between the detected frame synchronization signals, and stores this information in a memory, together with a history of counts of frame synchronization signals, and stores this information in a memory, together with a history of counts of frame synchronization signals of certain widths detected at certain intervals. This information is retained in the memory until frame synchronization is acquired, as determined from the stored count values, enabling frame synchronization to be acquired quickly despite the false detection of frame synchronization signals due to noise.
摘要翻译：数字音频广播接收机检测帧同步信号，测量检测到的帧同步信号的脉冲宽度和间隔，并将该信息与帧同步信号的计数历史一起存储在存储器中，并将该信息存储在存储器中，以及以特定间隔检测到的某些宽度的帧同步信号的计数历史。该信息被保留在存储器中，直到从存储的计数值确定获得帧同步为止，即使由于噪声而错误地检测到帧同步信号，也能够快速获取帧同步。

7. 发明授权

US06795559B1 Impulse noise reducer detecting impulse noise from an audio signal 失效
标题翻译：脉冲降噪器检测来自音频信号的脉冲噪声
公开(公告)号：US06795559B1
公开(公告)日：2004-09-21
申请号：US09723201
申请日：2000-11-28
申请人： Kenichi Taura , Masahiro Tsujishita , Masayuki Tsuji , Masayuki Ishida
发明人： Kenichi Taura , Masahiro Tsujishita , Masayuki Tsuji , Masayuki Ishida
IPC分类号： H04B1500
CPC分类号： H04B1/1027
摘要： An impulse noise reducer detects impulse noise in an audio signal by detecting and smoothing the high-frequency amplitude of the audio signal, attenuating the non-smoothed amplitude according to the smoothed amplitude, and comparing the attenuated amplitude with a threshold. Impulse noise is discriminated from high-frequency audio components because the latter tend to occur in longer-lasting bursts and are therefore attenuated more strongly. The impulse noise reducer is simplified because it does not have to perform intermediate-frequency signal processing, and its sensitivity is not affected by adjacent-channel signals because these signals are substantially absent from the audio signal. The impulse noise reducer can be implemented by digital signal processing, and is suitable for use in a medium-wave AM audio broadcast receiver.
摘要翻译：脉冲噪声降低器通过检测和平滑音频信号的高频振幅来检测音频信号中的脉冲噪声，根据平滑的幅度衰减非平滑幅度，并将衰减幅度与阈值进行比较。脉冲噪声与高频音频分量区分开来，因为后者往往会发生在持续较长的脉冲串中，因此会更强烈地衰减。由于不需要执行中频信号处理，所以脉冲噪声减少器被简化，并且其灵敏度不受相邻信道信号的影响，因为这些信号基本上不存在于音频信号中。脉冲减噪器可以通过数字信号处理实现，适用于中波AM音频广播接收机。

8. 发明授权

US06385261B1 Impulse noise detector and noise reduction system 有权
标题翻译：脉冲噪声检测器和降噪系统
公开(公告)号：US06385261B1
公开(公告)日：2002-05-07
申请号：US09233173
申请日：1999-01-19
申请人： Masayuki Tsuji , Masahiro Tsujishita , Kenichi Taura , Masayuki Ishida
发明人： Masayuki Tsuji , Masahiro Tsujishita , Kenichi Taura , Masayuki Ishida
IPC分类号： H03D104
CPC分类号： H04B1/10
摘要： An impulse noise detector detects impulse noise in an audio signal by filtering out the audio components of the signal, then comparing an envelope of a filtered signal with a threshold obtained as a moving average of the envelope. Short-duration impulse noise is thereby detected without detecting tone bursts and other fast-rising signals of longer duration. The envelope may be taken directly from the filtered signal, or from a difference signal obtained from a preliminary envelope of the filtered signal, to emphasize impulse noise when distorted audio components leak into the filtered signal.
摘要翻译：脉冲噪声检测器通过滤除信号的音频分量来检测音频信号中的脉冲噪声，然后将滤波信号的包络与作为包络的移动平均值获得的阈值进行比较。从而在没有检测到较长持续时间的音调脉冲串和其它快速上升信号的情况下检测短时脉冲噪声。可以从经滤波的信号或从滤波信号的初始包络获得的差分信号直接取包络线，以便在失真的音频分量泄漏到滤波信号中时强调脉冲噪声。

9. 发明授权

US08112780B2 Digital broadcast receiving apparatus 有权
标题翻译：数字广播接收装置
公开(公告)号：US08112780B2
公开(公告)日：2012-02-07
申请号：US11662084
申请日：2005-09-09
申请人： Kenichi Taura , Masayuki Ishida , Nobuyoshi Okumura , Tadatoshi Ohkubo
发明人： Kenichi Taura , Masayuki Ishida , Nobuyoshi Okumura , Tadatoshi Ohkubo
IPC分类号： H04N7/18
CPC分类号： H04B7/0874 , H04N5/4401 , H04N5/50 , H04N21/41422 , H04N21/42202 , H04N21/4263 , H04N21/4345 , H04N21/4382
摘要： A digital broadcast receiving apparatus has two systems as a receiving system: a first receiving demodulation section including a first tuner 2 and the like; and a second receiving demodulation section including a second tuner 5 and the like. A controller 19 establishes either a first receiving mode or second receiving mode. In the first receiving mode, both the receiving systems receive the broadcasting waves of the same station to be viewed according to the signals from a vehicle speed detecting section 15 and receiving level detecting sections 16 and 17. In the second receiving mode, one of the two receiving systems receives the broadcasting wave of the station to be viewed, and the other of them receives the broadcasting wave of another station.
摘要翻译：数字广播接收装置具有作为接收系统的两个系统：包括第一调谐器2等的第一接收解调部分; 以及包括第二调谐器5等的第二接收解调部分。控制器19建立第一接收模式或第二接收模式。在第一接收模式中，两个接收系统都根据来自车速检测部分15和接收电平检测部分16和17的信号接收要观察的同一电台的广播波。在第二接收模式中，两个接收系统接收要观看的台的广播波，另一个接收另一台的广播波。

10. 发明申请

US20070060082A1 Receiving apparatus 审中-公开
标题翻译：接收装置
公开(公告)号：US20070060082A1
公开(公告)日：2007-03-15
申请号：US10573981
申请日：2005-06-06
申请人： Nobuyoshi Okumura , Masayuki Ishida , Kenichi Taura , Tadatoshi Ohkubo
发明人： Nobuyoshi Okumura , Masayuki Ishida , Kenichi Taura , Tadatoshi Ohkubo
IPC分类号： H04B1/18
CPC分类号： H04H40/18 , H03J1/0008 , H04H20/28 , H04H20/57 , H04H60/13 , H04H60/41 , H04H60/51 , H04H60/65 , H04H60/73 , H04N5/4401 , H04N5/50 , H04N21/41422 , H04N21/42218 , H04N21/4345 , H04N21/4383 , H04N21/482
摘要： A receiving apparatus 10 receives a broadcasting wave to which service information indicating at least a channel number, a transmission broadcasting station name, and a broadcast target area are added. A control CPU 20 controls a tuner 11 so as to determine whether the broadcasting wave can be received in a predetermined region while changing the channel number, extracts the service information added to the broadcasting wave which is determined to be able to be received thereby, and registers the service information, as preset information, into one preset group in a memory 19. The control CPU then controls the tuner according to the preset information registered into the preset group so as to select the broadcasting wave.
摘要翻译：接收装置10接收附加了表示至少通道号，发送广播电台名称，广播目的地区域的业务信息的广播电波。控制CPU20控制调谐器11，以便在改变频道号的同时确定是否可以在预定区域中接收广播波，提取添加到被确定为能够接收的广播波的服务信息，以及将服务信息作为预置信息登记在存储器19中的一个预设组中。然后，控制CPU根据登记在预设组中的预设信息来控制调谐器，以便选择广播波。

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