公开(公告)号：US20020106987A1

公开(公告)日：2002-08-08

申请号：US09777503

申请日：2001-02-05

Inventor： Thomas M. Linden

IPC: H04B007/185

CPC classification number: H04H20/30 ,  H04H20/42 ,  H04H60/06 ,  H04H2201/183 ,  H04N21/2402 ,  H04N21/26216 ,  H04N21/2665 ,  H04N21/6112 ,  H04N21/8106 ,  H04N21/8126

Abstract: A network datacast system includes a plurality of transmission facilities. Each transmission facility receives primary programs from one or more media studios. Each transmission facility also receives ancillary data programs from a network datacast center. Each transmission facility broadcasts a wireless signal that includes a primary channel and at least one ancillary data channel. The transmission facilities contemporaneously transmit the ancillary programs on the ancillary data channels. A network datacast receiver contemporaneously receives the wireless signals and extracts the datacast programs from each datacast signal. The extracted datacast programs are stored in the receiver for subsequent output to the user.

Abstract translation: 网络数据广播系统包括多个传输设施。 每个传输设施从一个或多个媒体工作室接收主要节目。 每个传输设备还从网络数据中心接收辅助数据程序。 每个传输设备广播包括主要信道和至少一个辅助数据信道的无线信号。 传输设备同时在辅助数据信道上传输辅助节目。 网络数据接收器同时接收无线信号，并从每个数据广播信号中提取数据广播节目。 提取的数据广播节目存储在接收机中以便随后输出给用户。

公开(公告)号：US20010023175A1

公开(公告)日：2001-09-20

申请号：US09860246

申请日：2001-05-18

Inventor： Brian William Kroeger ,  Jeffrey Scott Baird

IPC: H04B001/00

CPC classification number: H04B1/109 ,  H04H40/27 ,  H04H2201/183 ,  H04L25/03006

Abstract: This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a signal of interest and an interfering signal and normalizing the composite signal to produce a normalized composite signal. The composite signal is then multiplied by the complex conjugate of the normalized composite signal to produce a real signal. Then the real signal is filtered and the resulting filtered signal is multiplied by the normalized composite signal to produce an output signal. The adverse effects of the interfering signal in the output signal are reduced with respect to the magnitude of the signal of interest reducing FM interference in an in-band on-channel digital audio broadcasting system, thereby making it easier to detect the signal of interest. The output signal and the composite can be blended in response to the power of the real and filtered signals Radio receivers that utilize the above method are also included.

公开(公告)号：US06259893B1

公开(公告)日：2001-07-10

申请号：US09192555

申请日：1998-11-03

Applicant: Brian William Kroeger ,  Jeffrey Scott Baird

Inventor： Brian William Kroeger ,  Jeffrey Scott Baird

IPC: H04B100

CPC classification number: H04B1/109 ,  H04H40/27 ,  H04H2201/183 ,  H04L25/03006

Abstract: This invention provides a method for reducing FM interference in an in-band on-channel digital audio broadcasting system. The method includes the steps of receiving a composite signal including a signal of interest and an interfering signal and normalizing the composite signal to produce a normalized composite signal. The composite signal is then multiplied by the complex conjugate of the normalized composite signal to produce a real signal. Then the real signal is filtered and the resulting filtered signal is multiplied by the normalized composite signal to produce an output signal. The adverse effects of the interfering signal in the output signal are reduced with respect to the magnitude of the signal of interest reducing FM interference in an in-band on-channel digital audio broadcasting system, thereby making it easier to detect the signal of interest. The output signal and the composite can be blended in response to the power of the real and filtered signals Radio receivers that utilize the above method are also included.

Abstract translation: 本发明提供一种降低带内同频数字音频广播系统中的FM干扰的方法。 该方法包括以下步骤：接收包括感兴趣的信号和干扰信号的复合信号，并对复合信号进行归一化以产生归一化复合信号。 然后将复合信号乘以归一化复合信号的复共轭以产生实信号。 然后对实信号进行滤波，并将得到的滤波信号乘以归一化复合信号以产生输出信号。 输出信号中的干扰信号的不利影响相对于感兴趣的信号的幅度减小，从而降低带内同频数字音频广播系统中的FM干扰，从而使得更容易检测感兴趣的信号。 响应于实际和滤波信号的功率，输出信号和复合可以混合使用上述方法的无线电接收机也包括在内。

公开(公告)号：US06178317B1

公开(公告)日：2001-01-23

申请号：US08947902

申请日：1997-10-09

Applicant: Brian W. Kroeger ,  Roy R. Stehlik

Inventor： Brian W. Kroeger ,  Roy R. Stehlik

IPC: H04B110

CPC classification number: H04H20/22 ,  H04B7/12 ,  H04H20/30 ,  H04H60/11 ,  H04H2201/183 ,  H04H2201/20 ,  H04L1/02 ,  H04L5/0005

Abstract: A system (100) is provided wherein a primary radio signal and a redundant radio signal are transmitted from a transmitter subsystem (120) and received by a receiver subsystem (140). The output (112) of an audio source (110) is coupled to a modulator (160) for modulating a radio frequency signal (162) for coupling to a transmit antenna (172). A second output (114) of audio source (110) is coupled to a delay circuit (116), for adding a predetermined time delay thereto. The delayed audio source signal is coupled to a modulator (164) for modulating a second radio frequency signal (166) that is also coupled to the transmit antenna (172). The receiver subsystem (140) receives both the primary radio signal and the delayed redundant radio signal and couples each to a respective demodulator (180, 182). At least one demodulator (180) includes a circuit (181) for determining the degradation in the primary radio signal and provides a quality measurement output signal (186) to a blend control circuit (190). The recovered primary audio signal from demodulator (180) is coupled to a second delay circuit (184), the time delay of second delay circuit (184) being substantially equal to the time delay of delay circuit (116). The audio output from delay circuit (184) and the redundant audio output from demodulator (182) are coupled to a blending subsystem (135), wherein each is combined with a weighting factor and then combined together to form a composite audio signal for coupling to the audio output circuit (150).

Abstract translation: 提供了一种系统（100），其中主要无线电信号和冗余无线电信号从发射机子系统（120）发送并由接收机子系统（140）接收。 音频源（110）的输出（112）耦合到调制器（160），用于调制用于耦合到发射天线（172）的射频信号（162）。 音频源（110）的第二输出（114）耦合到延迟电路（116），用于向其添加预定的时间延迟。 延迟的音频源信号耦合到调制器（164），用于调制也耦合到发射天线（172）的第二射频信号（166）。 接收机子系统（140）接收主无线电信号和延迟的冗余无线电信号，并且将每个信号耦合到相应的解调器（180,182）。 至少一个解调器（180）包括用于确定主无线电信号的劣化的电路（181），并向混合控制电路（190）提供质量测量输出信号（186）。 来自解调器（180）的恢复的主音频信号被耦合到第二延迟电路（184），第二延迟电路（184）的时间延迟基本上等于延迟电路（116）的时间延迟。 来自延迟电路（184）的音频输出和从解调器（182）输出的冗余音频耦合到混合子系统（135），其中每个与混合子系统（135）组合，然后组合在一起以形成复合音频信号，以耦合到 音频输出电路（150）。

公开(公告)号：US5949813A

公开(公告)日：1999-09-07

申请号：US914356

申请日：1997-08-19

Applicant: Bill J. Hunsinger ,  Derek D. Kumar

Inventor： Bill J. Hunsinger ,  Derek D. Kumar

IPC: H04B1/40 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/02 ,  H04L5/02 ,  H04L27/26 ,  H04B15/00

CPC classification number: H04L27/2601 ,  H04B1/406 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04L5/023 ,  H04H20/22 ,  H04H2201/183

Abstract: A system and method for transmitting digital information through a medium such as atmospheric free-space includes a transmitter which generates a signal based on a basis set of mutually orthogonal, spectrally-shaped, sequences of substantially equal length and having predetermined autocorrelation values. The sequences may resemble noise in at least some of their characteristics. The orthogonality or cross-correlation characteristics, the autocorrelation characteristics and the resemblance to noise are due to features derived from sequences of pseudo-random numbers which themselves resemble noise in at least some of their characteristics. The waveform set based on the sequences is modulated digitally. The modulated set may be summed together along with a wideband reference signal of reduced amplitude and optionally an FM analog signal to form a composite signal which is broadcast typically through free space to at least one receiver. The receiver separates the analog FM signal from the digital signal and thereafter demodulates the digital data-carrying waveforms and outputs a stream of digital data. It has been determined to be resistant to multipath degradation.

公开(公告)号：US5903598A

公开(公告)日：1999-05-11

申请号：US914355

申请日：1997-08-19

Applicant: Bill J. Hunsinger ,  Derek D. Kumar

Inventor： Bill J. Hunsinger ,  Derek D. Kumar

IPC: H04B1/40 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/02 ,  H04L5/02 ,  H04L27/26 ,  H04K1/00

CPC classification number: H04L27/2601 ,  H04B1/406 ,  H04B1/707 ,  H04B1/7097 ,  H04H20/33 ,  H04J9/00 ,  H04L5/023 ,  H04H20/22 ,  H04H2201/183

Abstract: A system and method for transmitting digital information through a medium such as atmospheric free-space includes a transmitter which generates a signal based on a basis set of mutually orthogonal, spectrally-shaped, sequences of substantially equal length and having predetermined autocorrelation values. The sequences may resemble noise in at least some of their characteristics. The orthogonality or cross-correlation characteristics, the autocorrelation characteristics and the resemblance to noise are due to features derived from sequences of pseudo-random numbers which themselves resemble noise in at least some of their characteristics. The waveform set based on the sequences is modulated digitally. The modulated set may be summed together along with a wideband reference signal of reduced amplitude and optionally an FM analog signal to form a composite signal which is broadcast typically through free space to at least one receiver. The receiver separates the analog FM signal from the digital signal and thereafter demodulates the digital data-carrying waveforms and outputs a stream of digital data. It has been determined to be resistant to multipath degradation.

公开(公告)号：US5465396A

公开(公告)日：1995-11-07

申请号：US3189

申请日：1993-01-12

Applicant: Billie J. Hunsinger ,  A. J. Vigil ,  Leland P. Solie

Inventor： Billie J. Hunsinger ,  A. J. Vigil ,  Leland P. Solie

IPC: H04H20/30 ,  H04H60/11 ,  H04L5/02 ,  H04B1/04 ,  H04B1/12 ,  H04B1/68

CPC classification number: H04L5/023 ,  H04H20/30 ,  H04H2201/183 ,  H04H2201/20 ,  H04H60/11

Abstract: A system for combining AM and FM transmissions. In-band, On-channel, FM Digital Audio Broadcast (IBOC FM-DAB) allows simultaneous transmission of DAB and FM over existing FM allocations without interfering with conventional analog FM signals. The utility of existing FM spectrum allocations is therefore enhanced.

Abstract translation: 用于组合AM和FM传输的系统。 带内，在线，FM数字音频广播（IBOC FM-DAB）允许DAB和FM在现有FM分配上同时传输，而不会干扰传统的模拟FM信号。 因此，现有FM频谱分配的效用得到提高。

公开(公告)号：US5315583A

公开(公告)日：1994-05-24

申请号：US684529

申请日：1991-04-11

Applicant: John L. Murphy ,  Mark J. Rich

Inventor： John L. Murphy ,  Mark J. Rich

IPC: H04H20/31 ,  H04H20/95 ,  H04H40/18 ,  H04H40/54 ,  H04H60/07 ,  H04L1/00 ,  H04L27/26 ,  H04J13/00

CPC classification number: H04L1/0071 ,  H04H20/31 ,  H04H20/95 ,  H04H40/18 ,  H04H60/07 ,  H04L27/2602 ,  H04L27/2657 ,  H04L27/2675 ,  H04H2201/183 ,  H04H40/54 ,  H04L1/0057 ,  H04L2001/0093

Abstract: A radio broadcasting system for a composite signal consisting of a frequency modulated (fm) analog signal and a multicarrier modulated digital signal is provided which is resistive to multipath degradation. The fm signal and the digital multicarrier modulated signal are fully coherent. The digital signal uses a plurality of carriers having a maximum amplitude at least 20 dB below the unmodulated fm signal. The multicarrier modulated signal is phase locked to a recovered analog fm pilot tone in the composite baseband spectrum of the fm signal which is at least 20 dB above the multicarrier modulated signal, which enables rapid and reliable acquisition of signal for coherent detection. In a specific embodiment the multicarrier modulated signal is a synthesized vector-modulated signal which is a quadrature phase shift keyed (QPSK) modulated set of synthesized carriers each occupying 9.5 kHz of spectrum replicated twenty-one times within a 199.5 kHz bandwidth with no more than two bits per vector. An efficient channel coding consisting of high efficiency block coding, such as BCH 255, 239 code, is employed in connection with time interleaving of bits to mitigate the effects of frequency selective multipath and broadband multipath. The broadcast system is designed to be used in support of compressed digital audio programming material. In demodulation, a demodulator is phased-locked to the recovered high-amplitude analog pilot tone to coherently demodulate the digital signal, to deinterleave, to decode the block encoded signal and to format the recovered data stream for source decoding.

Abstract translation: 提供了一种用于由频率调制（fm）模拟信号和多载波调制数字信号组成的复合信号的无线电广播系统，其对多径降级具有阻力。 fm信号和数字多载波调制信号是完全相干的。 数字信号使用具有比未调制的fm信号低至少20dB的最大幅度的多个载波。 多载波调制信号被锁定到fm信号的复合基带频谱中的恢复的模拟fm导频音，其在多载波调制信号之上至少20dB，这使得能够快速可靠地获取用于相干检测的信号。 在具体实施例中，多载波调制信号是合成矢量调制信号，它是一个合成载波的正交相移键控（QPSK）调制集合，每个合成载波在199.5kHz带宽内占据复制二十一次频谱的9.5kHz频谱，不超过 每个矢量两位。 与诸如BCH 255,239码之类的高效率块编码组合的有效信道编码被用于与时间交织比特相结合以减轻频率选择性多路径和宽带多径的影响。 广播系统设计用于支持压缩数字音频编程材料。 在解调中，解调器被锁相到恢复的高幅度模拟导频音，以相干地解调数字信号，去交织，解码块编码信号，并格式化恢复的数据流以进行源解码。

公开(公告)号：US20180308499A1

公开(公告)日：2018-10-25

申请号：US15926536

申请日：2018-03-20

Applicant: Ibiquity Digital Corporation

Inventor： Gabriel Olochwoszcz ,  Ashwini Pahuja

IPC: G10L19/16 ,  H04H60/12 ,  H04H20/30 ,  G10L19/008 ,  G10L19/24 ,  H04B1/16

CPC classification number: G10L19/167 ,  G10L19/008 ,  G10L19/24 ,  H04B1/16 ,  H04H20/30 ,  H04H60/12 ,  H04H2201/183

Abstract: A method of processing a digital radio broadcast signal includes: (a) determining a plurality of current correlation sample values representative of a time delay between samples in an analog audio sample stream and samples in a digital audio sample stream; (b) determining a current inversion status; (c) updating a delay history and an inversion status history; (d) checking the current correlation sample values for consistency with a first confidence threshold; (e) if consistency is found in step (d), determining if each of a first plurality of values in the delay history is consistent within a predetermined range of the current correlation sample values; (f) if consistency is found in step (e), determining if a value in the inversion status history is consistent with the current inversion status; and (g) if the consistency is found in step (f), allowing blending of an output to the digital audio sample stream.

公开(公告)号：US10015439B1

公开(公告)日：2018-07-03

申请号：US15831516

申请日：2017-12-05

Applicant: Scientronic Inc.

Inventor： Cheng-Ta Fan ,  Shiang-Joe Lee

IPC: H04N5/38 ,  H04N5/40 ,  H04N5/44 ,  H04N5/455 ,  H04N7/01 ,  H04N7/045 ,  H04L27/00 ,  H04L27/14 ,  H04L27/12 ,  H04H20/71 ,  H03F1/26

CPC classification number: H04N7/0125 ,  H03F1/26 ,  H04H20/71 ,  H04H2201/183 ,  H04L27/0002 ,  H04L27/12 ,  H04L27/14 ,  H04N7/045 ,  H04N21/4223 ,  H04N21/42676 ,  H04N21/43637 ,  H04N21/6112

Abstract: The present invention provides a system for frequency modulation of high definition composite video broadcast signals in a wireless transmission environment and a method thereof, comprising: a transmitting unit and a receiving unit. An image sensor of the transmitting unit converts an image to a digital signal. A signal processor converts the digital signal to a composite video broadcast signal. A frequency modulator modulates the composite video broadcast signal to a first modulated signal. The receiving unit receives the first modulated signal. A low noise amplifier converts the first modulated signal to a second modulated signal. A frequency demodulator restores the second modulated signal to the composite video broadcast signal. After an image decoder decodes the composite video broadcast signal, the image decoder outputs a digital signal in a specific format.