公开(公告)号：CA2295283C

公开(公告)日：2004-08-17

申请号：CA2295283

申请日：2000-01-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUNDBERG CARL-ERIK WILHELM ,  SINHA DEEPEN

IPC: G10L19/00 ,  H03M7/30 ,  H04H20/00 ,  H04L1/00 ,  H04L29/04 ,  H04H1/00

Abstract: The invention provides methods and apparatus for processing information, e.g ., audio, video or image information, for transmission in a communication syste m. In an illustrative embodiment, a joint multiple program coder determines the value of a single-bit or multiple-bit criticality measure, e.g., criticality flag, in a designated interval, e.g., the duration of an audio frame, for each of the programs in a set of multiple programs to be transmitted in the system. The joint multiple program coder allocates a pool of available bits to the programs based at least in part on the determined values of the criticality measures, such that a program with a higher-valued criticality measure in the designat ed time interval is allocated a greater percentage of the available bits for that interval th an another one of the programs with a lower-valued criticality measure. The joint multiple program coder repeats the determination and allocation operations for each of a number of time intervals, e.g., frames, such that the bit allocation can vary from interval to interval.

公开(公告)号：CA2300579C

公开(公告)日：2004-02-10

申请号：CA2300579

申请日：2000-03-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM ,  LOU HUI-LING

IPC: H04L27/00 ,  H04B1/04 ,  H04B1/16 ,  H04B15/00 ,  H04H20/30 ,  H04H60/07 ,  H04J1/00 ,  H04B14/08 ,  H04L27/26

Abstract: In a communications system implementing, e.g., an in- band on channel AM (IBOC-AM) (also known as "hybrid IBOC- AM") scheme, multiple bit streams are used to represent an audio signal to be transmitted over one or more frequency bands including, e.g., parts of an AM frequency band for radio broadcast. These bit streams contain various and/or equivalent amounts of audio information. In an illustrative embodiment, at least one of the bit streams is a core bit stream containing core audio information. The remaining bit streams are enhancement bit streams containing enhancement audio information. The core bit stream is necessary for recovering the audio signal with minimal acceptable quality. Such quality is enhanced when the core bit stream, together with one or more of the enhancement bit streams, is used to recover the audio signal. In accordance with the invention, the AM frequency band is divided. into subbands. Each of the core and enhancement bit streams is assigned to a respective one of the subbands for transmission. The assignment is conducive to an effective treatment of interference affecting the IBOC-AM system. Other embodiments may include, e.g., communications of the multiple bit streams in accordance with the invention in an IBOC-FM system, a satellite broadcasting system, etc.

公开(公告)号：CA2295281C

公开(公告)日：2003-11-04

申请号：CA2295281

申请日：2000-01-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM

IPC: G10L19/00 ,  H03M7/30 ,  H04H20/00 ,  H04L1/00 ,  H04L1/08 ,  H04H1/00

Abstract: The invention provides methods and apparatus for decoding multiple program information, e.g., audio, video or image information, in a communication system. In an illustrative embodiment, a multiple program decoder includes a deinterleaver for deinterleaving information corresponding to a set of frames, using a specifi ed deinterleaving length. A given one of the frames includes information from each of at least a subset of the programs, and the frames are encoded using an outer code, e.g., a CRC code, RS code, BCH code or other type of linear block code, and an inner code, e.g., a convolutional code, turbo code or trellis coded modulation. The multiple program decoder include s an inner code decoder for decoding the inner code over one or more of the programs, a nd an outer code decoder for decoding the outer code for a selected one of the programs. The deinterleaving length of the deinterleaver and operating rate of the inner code decoder can be configured such that the multiple program decoder provides substantially instantaneous tuning within a given cluster of programs, or within a set of clusters each including multiple programs. The programs may, but need not, include jointly-coded audio programs. The invention may be implemented in numerous applications, such as simultaneous multiple program listening and/or recording, simultaneous delivery of audio and data, etc.

公开(公告)号：CA2266114C

公开(公告)日：2002-08-20

申请号：CA2266114

申请日：1999-03-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUNDBERG CARL-ERIK WILHELM ,  CHEN BRIAN

IPC: H04L27/00 ,  H04B1/04 ,  H04H20/00 ,  H04J11/00 ,  H04L5/02 ,  H04L27/36 ,  H04B3/06 ,  H04B7/005 ,  H04L27/04

Abstract: In a communications system implementing an in-band on channel AM (IBOC-AM) (also known as "hybrid IBOC-AM") scheme, digitally modulated signals are transmitted in a 30 kHz digital band centered at an analog host AM carrier frequency f c. The host AM carrier is assigned to the geographic area served by the communications system for AM radio broadcast. It is likely that a similar IBOC-AM scheme is implemented in an adjacent area which is assigned a second analog host AM carrier having a frequency which is either 20 kHz higher or lower than f c. In that case, the transmission of the digitally modulated signals are interfered by a similar transmission in the adjacent area. The interference is known as "second adjacent channel interference." To reduce such interference, selected power profiles in accordance with the invention are used to allocate the relative transmission power to the digitally modulated signals in the digital band.

公开(公告)号：CA2327681A1

公开(公告)日：2001-06-15

申请号：CA2327681

申请日：2000-12-06

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM ,  LANEMAN JERRY NICHOLAS

IPC: H04N7/26 ,  G10L19/00 ,  H03M13/09 ,  H03M13/15 ,  H04L1/00 ,  H04H1/00 ,  H04L1/22

Abstract: Improved channel code configurations for use in transmission of digital audi o or other types of information in a digital communication system. The channel code may include an outer channel code, e.g., a cyclic redundancy code (CRC), and an inner chann el code, e.g., a complementary punctured pair convolutional (CPPC) code. In accordance with the invention, multiple code words of the outer code are associated with a given packet of the digital information, in accordance with a particular outer code configuratio n, so as to provide partial error flagging for different portions of the given packet. An information encoder, e.g., a PAC encoder, interacts with an outer code encoder to determine a bit allocation for transmission of packets at a particular bit rate, based at least in part on the outer code configuration. The invention is particularly well-suited for use in the transmission of digital audio information in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system, but is also applicable to other types of information and other types of communication systems.

公开(公告)号：CA2308973A1

公开(公告)日：2000-11-28

申请号：CA2308973

申请日：2000-05-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUNDBERG CARL-ERIK WILHELM ,  LANEMAN JERRY NICHOLAS

IPC: H04H20/30 ,  H04H60/11 ,  H04J1/12 ,  H04J11/00 ,  H04L1/00 ,  H04L27/26 ,  H04B1/10

Abstract: Techniques for processing received information in a communication system, such that performance is significantly improved in the presence of certain types of interference. In an illustrative embodiment, first and second digital sidebands are transmitted on either side of an FM or AM host carrier signal in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The compressed digital audio information in the sidebands is encoded using an outer code, e.g., a cyclic redundancy code (CRC), and an inner code, e.g., a complementary punctured pair convolutional (CPPC) code. A receiver generates an error indicator based at least in part on a first decoding of the received information. The error indicator characterizes interference associated with at least one of the digital sidebands. The receiver then generates at least one alternative decoding of the received information if the error indicator has a designated characteristic. For example, the receiver may generate the alternative decoding by eliminating from consideration in the receiver decoding process a designated portion of at least one of the digital sidebands. The error indicator may be indicative of the presence or absence of a first adjacent interference signal of a particular level within a frequency band associated with one of the sidebands, and may be based on, e.g., a signal-to-noise ratio measurement generated from a pilot tone associated with a given sideband, and/or an error flag generated using the CRC outer code. Portions of the given sideband may be eliminated from consideration via successive erasures of sideband components, i.e., subbands, thereby resulting in an increase in the effective code rate of the inner code.