公开(公告)号：EP1113604A3

公开(公告)日：2003-10-29

申请号：EP00309328.3

申请日：2000-10-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Nease, Greg Alan

IPC: H04H1/00

CPC classification number: H04H40/18 ,  H03G3/3068 ,  H04H2201/183 ,  H04H2201/20

Abstract: A digital receiver for receiving an analog host signal with one or more digital sidebands includes a bandreject filter arranged at least in part in an intermediate frequency (IF) processing stage of the receiver. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of a frequency modulated (FM) analog host signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The received composite signal is filtered in the IF processing stage of the receiver by the bandreject filter in order to substantially attenuate the analog host signal while passing the digital sidebands. The bandreject filter may be arranged in the IF processing stage so as to filter the analog host signal from the composite signal at a point prior to an input of an automatic gain control (AGC) circuit, such that the AGC operating point is determined primarily by the digital sidebands. The bandreject filter may have a group delay characteristic for a portion of a frequency spectrum associated with the digital sidebands that is selected to equalize a corresponding group delay characteristic for a signal path of the receiver.

公开(公告)号：EP1125384A2

公开(公告)日：2001-08-22

申请号：EP99965739.8

申请日：1999-10-28

Applicant: IBIQUITY DIGITAL CORPORATION

Inventor： KROEGER, Brian, William ,  BAIRD, Jeffrey, Scott

IPC: H04H1/00 ,  H04B1/10

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：EP1113604A2

公开(公告)日：2001-07-04

申请号：EP00309328.3

申请日：2000-10-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Nease, Greg Alan

IPC: H04H1/00

CPC classification number: H04H40/18 ,  H03G3/3068 ,  H04H2201/183 ,  H04H2201/20

Abstract: A digital receiver for receiving an analog host signal with one or more digital sidebands includes a bandreject filter arranged at least in part in an intermediate frequency (IF) processing stage of the receiver. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of a frequency modulated (FM) analog host signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The received composite signal is filtered in the IF processing stage of the receiver by the bandreject filter in order to substantially attenuate the analog host signal while passing the digital sidebands. The bandreject filter may be arranged in the IF processing stage so as to filter the analog host signal from the composite signal at a point prior to an input of an automatic gain control (AGC) circuit, such that the AGC operating point is determined primarily by the digital sidebands. The bandreject filter may have a group delay characteristic for a portion of a frequency spectrum associated with the digital sidebands that is selected to equalize a corresponding group delay characteristic for a signal path of the receiver.

Abstract translation: 用于与一个或多个数字边带模拟宿主信号的接收的数字接收机包括在中频（IF）部分至少设置在过滤带阻接收机的处理阶段。 在一个说明性的实施方式中，第一和第二数字边带都在调频（FM）中的带内同频混合模拟宿主信号的频率的任意一侧反mitted（HIBOC）数字音频广播（DAB）系统，该接收的复合信号是 过滤在接收机由带阻滤波器的IF处理阶段为了显着地衰减的模拟宿主信号在经过数字边带。 该带阻滤波器可以在IF处理级被布置为在一个点上的自动增益控制的输入之前过滤来自复合信号的模拟主机信号（AGC）电路，检查并在AGC操作点确定性主要通过开采 数字边带。 该带阻滤波器可以具有群延迟用于与数字边带相关联的频谱的一部分特性没有被选择，以均衡一个相应的群延迟特性为接收器的信号路径。

公开(公告)号：EP1041756A2

公开(公告)日：2000-10-04

申请号：EP00302601.0

申请日：2000-03-29

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Mansour, David ,  Sinha, Deepen ,  Sundberg, Carl-Erik Wilhelm

IPC: H04H1/00

CPC classification number: H04H20/30 ,  H04H60/07 ,  H04H2201/183 ,  H04H2201/186 ,  H04L5/023

Abstract: Methods and apparatus for processing information, e.g., audio, speech, video or image information, for transmission in a communication system. In an illustrative embodiment, a set of bit streams are generated from an audio information signal. The set of bit streams may be, e.g., a total of four bit streams generated by separating each of two multiple description bit streams, corresponding to separate representations of the audio information signal, into first and second class bit streams. The first and second class bit streams associated with the first multiple description bit stream may then be transmitted in respective first and second subbands of a first sideband of an FM host carrier, while the first and second class bit streams associated with the second multiple description bit stream are transmitted in respective first and second subbands of a second sideband of the FM host carrier. The first class bit streams may be provided with a different level of error protection than the second class bit streams, e.g., by utilizing different portions of a non-uniform power profile for the corresponding subbands, or by placement of the bit streams in subbands having different susceptibility to interference. Delay may be introduced between at least a subset of the bit streams in order to provide improved performance, e.g., in the presence of fading.

Abstract translation: 的方法和设备，用于处理信息，E. G.，音频，语音，视频或图像的信息，用于在通信系统中的传输。在说明性实施例中，一组位流被从音频信息信号中产生。 该组位流的可以是E. G.，总共由每两个多描述比特流的分离，对应于音频信息信号，的表示分离成第一和第二类比特流生成4个比特流。 然后与第一多描述比特流相关联的第一和第二类比特流可以是在FM主载波的第一边带的respectivement第一和第二子带反mitted，而与第二多描述比特相关联的第一和第二类的比特流 流是在FM主载波的第二边带的respectivement第一和第二子带反mitted。 第一类比特流可以通过利用为相应的子带的非均匀功率分布的不同部分被提供有不同电平的差错保护比第二类比特流，例如，或通过在具有子带的比特流的位置 不同的易受干扰。 延迟可能至少比特流的子集之间，以提供改进的性能，E. G.，在衰落的存在而引入。

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.

公开(公告)号：US20180139499A1

公开(公告)日：2018-05-17

申请号：US15842107

申请日：2017-12-14

Applicant: Ibiquity Digital Corporation

Inventor： Russell Iannuzzelli

IPC: H04N21/44 ,  H04N21/439

CPC classification number: H04N21/44004 ,  H04H60/07 ,  H04H2201/183 ,  H04H2201/186 ,  H04N21/23406 ,  H04N21/4392

Abstract: An apparatus for controlling a data rate in a data client for a digital audio broadcasting system includes a buffer for storing data, a codec for coding data, and a control module for controlling a bit rate of the codec in response to a level of the data in the buffer. A method performed by the apparatus is also included.

公开(公告)号：US08891683B2

公开(公告)日：2014-11-18

申请号：US12310578

申请日：2007-08-30

Applicant: Naoki Nakajima ,  Kazuyoshi Inako ,  Masanori Ishida ,  Kazuo Koyama

Inventor： Naoki Nakajima ,  Kazuyoshi Inako ,  Masanori Ishida ,  Kazuo Koyama

IPC: H03K9/00 ,  H03J1/00 ,  H04H20/30 ,  H04H60/73 ,  H04H60/44

CPC classification number: H03J1/0075 ,  H04H20/30 ,  H04H60/44 ,  H04H60/73 ,  H04H2201/183

Abstract: A broadcast receiver suitable for receiving broadcast signals transferred by use of signal format of IBOC system. The broadcast receiver comprises a receiving means that holds information related to channels that can be acquired by a digital signal decoding process. If information related to a channel is to be used and is held by the information holding means, then it is used.

Abstract translation: 适用于接收使用IBOC系统的信号格式传送的广播信号的广播接收机。 广播接收机包括一个接收装置，用于保存与可以通过数字信号解码过程获得的信道有关的信息。 如果要使用与信道相关的信息并由信息保持装置保存，则使用它。

公开(公告)号：US08265585B2

公开(公告)日：2012-09-11

申请号：US12310583

申请日：2007-08-30

Applicant: Kazuyoshi Inako ,  Kazuo Koyama ,  Masanori Ishida ,  Naoki Nakajima

Inventor： Kazuyoshi Inako ,  Kazuo Koyama ,  Masanori Ishida ,  Naoki Nakajima

IPC: H04B1/10

CPC classification number: H04H40/18 ,  H04H20/30 ,  H04H2201/183

Abstract: An broadcasting receiver suitable for receiving a broadcasting signal transmitted in an IBOC signal format, includes: a narrowband filtering means suitable for processing an analog broadcasting signal included in the broadcasting signal; a wideband filtering means suitable for processing a digital broadcasting signal included in the broadcasting signal; a demodulating means for demodulating the broadcasting signal; a signal level detecting means for detecting a level of the broadcasting signal; a digital determining means for determining whether the broadcasting signal includes digital broadcasting signal or not; and a filter switching means for switching filtering means for use in processing the broadcasting signal to be input to the demodulating means between the narrowband filtering means and the wideband filtering means, according to the level of the detected broadcasting signal, when the digital determining means determines that the broadcasting signal does not include the digital broadcasting signal.

Abstract translation: 适用于接收以IBOC信号格式发送的广播信号的广播接收机包括：适用于处理广播信号中包含的模拟广播信号的窄带滤波装置; 适用于处理广播信号中包含的数字广播信号的宽带滤波装置; 解调装置，用于解调广播信号; 信号电平检测装置，用于检测广播信号的电平; 数字确定装置，用于确定广播信号是否包括数字广播信号; 以及滤波器切换装置，用于当数字确定装置确定时，根据检测到的广播信号的电平，将滤波装置切换用于处理要输入到窄带滤波装置和宽带滤波装置之间的解调装置的广播信号 广播信号不包括数字广播信号。

公开(公告)号：US08138915B2

公开(公告)日：2012-03-20

申请号：US11984290

申请日：2007-11-15

Applicant: Marek Milbar

Inventor： Marek Milbar

IPC: G08B1/08

CPC classification number: G08B27/008 ,  H04H20/59 ,  H04H2201/183

Abstract: A method for rendering an alert message on a digital radio broadcast receiver is described. A digital radio broadcast signal is received at the digital radio broadcast receiver. Data corresponding to an alert message comprising type information for identifying a type of the alert message and message information is detected. If the type information satisfies a triggering condition for a type of alert message pre-selected by a user of the digital radio broadcast receiver, the message information is rendered at the digital radio broadcast receiver. A digital radio broadcast receiver that performs the method is also described.

Abstract translation: 描述了一种在数字无线电广播接收机上呈现警报消息的方法。 在数字无线电广播接收机处接收数字无线电广播信号。 检测对应于包括用于识别警报消息的类型的类型信息和消息信息的警报消息的数据。 如果类型信息满足由数字无线电广播接收机的用户预先选择的一种警报消息的触发条件，则在数字无线电广播接收机处呈现消息信息。 还描述了执行该方法的数字无线电广播接收机。