公开(公告)号：EP2051391A1

公开(公告)日：2009-04-22

申请号：EP07806377.3

申请日：2007-08-30

Applicant: Clarion CO., LTD.

Inventor： INAKO, Kazuyoshi ,  KOYAMA, Kazuo ,  ISHIDA, Masanori ,  NAKAJIMA, Naoki

IPC: H04B1/16 ,  H04H1/00

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; 用于确定广播信号是否包括数字广播信号的数字确定装置; 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：EP1550224A4

公开(公告)日：2008-08-27

申请号：EP03754953

申请日：2003-09-26

Applicant: IBIQUITY DIGITAL CORP

Inventor： MILBAR MAREK

IPC: H03M13/00 ,  H03M13/27 ,  H04H20/00

CPC classification number: H03M13/2789 ,  H03M13/271 ,  H03M13/2732 ,  H03M13/276 ,  H04H2201/183 ,  H04H2201/186

Abstract: This invention provides a method for interleaving bits of a digital signal representative of data and/or audio in a digital audio broadcasting system, the method comprising the step of: writing a plurality of bits of the digital signal to a matrix (Fig.22); and reading the bits from the matrix, wherein at least one of the writing and reading steps follows a non-sequential addressing scheme. Apparatus for transmitting the interleaved bits, and apparatus for receiving and deinterleaving the bits are also provided.

公开(公告)号：EP1073222A3

公开(公告)日：2005-06-08

申请号：EP00306081.1

申请日：2000-07-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Norr, William M.

IPC: H04H1/00

CPC classification number: H04H60/23 ,  H04H60/07 ,  H04H2201/183 ,  H04H2201/20 ,  H04K1/00 ,  H04L9/0827 ,  H04L2209/56 ,  H04L2209/80

Abstract: Audio or other information is delivered to a user via a multi-stream digital broadcasting system in a partially-encrypted form. The information is encoded and separated into multiple bitstreams, at least a subset of which are left unencrypted. Both the encrypted and unencrypted bitstreams are received and stored by the user. A user is able, for at least a limited period of time, to access the information at a first quality level, e.g., an FM-quality level for audio information, without having the corresponding decryption key, by utilizing only the unencrypted bitstreams. The user can then access an electronic-commerce web site to purchase the decryption key. The key may be downloaded from the site to an information processing device of the user, and may be utilized to decrypt the partially-encrypted format, such that the user is provided with access to the information at a second quality level higher than the first quality level, e.g., a CD-quality level for audio information. The multiple bitstreams may correspond, e.g., to subbands of at least first and second digital sidebands of a host carrier signal in an FM in-band on-channel (FM-IBOC) digital audio broadcasting system.

公开(公告)号：EP0825736A3

公开(公告)日：2001-03-07

申请号：EP97306133.6

申请日：1997-08-12

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Papadopoulos, Haralabos C. ,  Sundberg, Carl-Erik Wilhelm

IPC: H04J9/00 ,  H04H1/00 ,  H04J1/20 ,  H04L27/233

CPC classification number: H04H20/30 ,  H04H2201/183

Abstract: In a system for simulcasting digitally modulated and analog FM signals over the same FM frequency band, the effect of the analog FM signal on the digitally modulated signal in the simulcast is calculated and canceled from the latter signal before its transmission. As a result, the digital transmission is free from interference from the analog FM signal. Moreover, the digital transmission is designed in such a manner that the interference caused thereby to the analog FM signal is kept at a minimal level.

公开(公告)号：EP1025663A1

公开(公告)日：2000-08-09

申请号：EP98953529.9

申请日：1998-10-06

Applicant: USA Digital Radio, Inc.

Inventor： KROEGER, Brian, William ,  STEHLIK, Roy, Ronald

IPC: H04H1/00 ,  H04L1/02 ,  H04L27/26 ,  H04B7/12

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

Abstract: A system (100) for mitigating intermittent interruptions in an audio radio broadcast system 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 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).

公开(公告)号：EP3281316A1

公开(公告)日：2018-02-14

申请号：EP16775985.1

申请日：2016-04-08

Applicant: Nautel Limited

Inventor： SCHMID, Philipp ,  WALKER, Brian

IPC: H04H20/95 ,  H04H20/30 ,  H04H20/46 ,  H04H60/27 ,  H04J11/00

CPC classification number: H04L27/2621 ,  H04H20/00 ,  H04H2201/12 ,  H04H2201/183 ,  H04L27/2623 ,  H04L27/2624

Abstract: A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.

公开(公告)号：EP2051392A4

公开(公告)日：2012-09-05

申请号：EP07806379

申请日：2007-08-30

Applicant: CLARION CO LTD

Inventor： KOYAMA KAZUO ,  ISHIDA MASANORI ,  INAKO KAZUYOSHI ,  NAKAJIMA NAOKI

IPC: H04B1/16 ,  H03J1/00 ,  H03J5/02 ,  H04H20/30 ,  H04H40/18

CPC classification number: H03J1/0091 ,  H04H20/30 ,  H04H20/89 ,  H04H40/18 ,  H04H60/41 ,  H04H2201/183

Abstract: A broadcasting receiver suitable for receiving a broadcasting signal transmitted in an IBOC signal format, comprises: a channel seek directing means for directing to start a channel seeking operation that selects selectable channel in an order of frequency; a channel seek controlling means for starting and controlling the channel seeking operation in accordance with the direction of the channel seek directing means; and a multichannel determining means for determining whether a selected frequency channel is providing multichannel digital broadcasting or not; and wherein the channel seek controlling means selects a next subchannel in an order of identification code before searching for the next frequency channel, if it is determined by the multichannel determining means that the selected frequency channel is providing the multichannel digital broadcasting.

公开(公告)号：EP1552630A4

公开(公告)日：2010-11-03

申请号：EP03809103

申请日：2003-10-16

Applicant: IBIQUITY DIGITAL CORP

Inventor： MILBAR MAREK ,  STEKAS JAMES C

IPC: H04L27/04 ,  H04H20/30 ,  H04L25/03 ,  H04L27/26 ,  H04H1/00

CPC classification number: H04L25/03866 ,  H04H20/30 ,  H04H20/95 ,  H04H2201/183 ,  H04H2201/20 ,  H04L27/2601

公开(公告)号：EP2058949A4

公开(公告)日：2009-12-09

申请号：EP07806378

申请日：2007-08-30

Applicant: CLARION CO LTD

Inventor： ISHIDA MASANORI ,  KOYAMA KAZUO ,  INAKO KAZUYOSHI ,  NAKAJIMA NAOKI

IPC: H04H20/30 ,  H04B1/16 ,  H04H20/31

CPC classification number: H04H40/18 ,  H04H20/30 ,  H04H60/43 ,  H04H2201/183

公开(公告)号：EP2058949A1

公开(公告)日：2009-05-13

申请号：EP07806378.1

申请日：2007-08-30

Applicant: CLARION Co., Ltd.

Inventor： ISHIDA, Masanori ,  KOYAMA, Kazuo ,  INAKO, Kazuyoshi ,  NAKAJIMA, Naoki

IPC: H04B1/16

CPC classification number: H04H40/18 ,  H04H20/30 ,  H04H60/43 ,  H04H2201/183

Abstract: A broadcasting receiver suitable for receiving broadcasting signal transmitted with signal format is provided in which carrier wave is allocated in a frequency channel with certain frequency offset and signal intensity, which comprises: an information acquiring means for acquiring information related to the frequency channel in seek; and a station existence determining means for determining whether the frequency channel is station-existent or not based on information acquired by the information acquiring means; and wherein, the information acquiring means acquires information for receiving intensity of carrier wave and information for frequency offset.

Abstract translation: 提供一种适用于接收以信号格式发送的广播信号的广播接收机，其中载波在具有特定频率偏移和信号强度的频道中分配，其包括：信息获取装置，用于获取与寻道中的频道相关的信息; 以及站存在确定装置，用于基于由所述信息获取装置获取的信息来确定所述频道是否是站点存在的; 并且其中，所述信息获取装置获取用于接收载波强度的信息和用于频偏的信息。