公开(公告)号：WO2012054757A2

公开(公告)日：2012-04-26

申请号：PCT/US2011/057145

申请日：2011-10-20

Applicant: QUALCOMM Incorporated ,  VISHWANATH, Tg ,  BLESSENT, Luca ,  AKHAVAN, Koorosh ,  MASAMOTO, James T.

Inventor： VISHWANATH, Tg ,  BLESSENT, Luca ,  AKHAVAN, Koorosh ,  MASAMOTO, James T.

IPC: H04L27/233 ,  H04L7/00 ,  H04H40/54

CPC classification number: H04L27/2331 ,  H04H20/34 ,  H04L2027/0016 ,  H04L2027/0036 ,  H04L2027/0051 ,  H04L2027/0085

Abstract: A method of switching between Coherent and Non-Coherent demodulation based on computed metrics, in cases where stereo FM broadcasting stations do not adhere to RDS broadcast specifications. Re-utilizes existing hardware to demodulate RDS data in mono. The residual frequency offset is resolved using a Non Coherent demodulator and a time tracking algorithm. RDS data relies on the 57 kHz sub-carrier that is generated using 19 kHz pilot tone. In Mono broadcasting pilot tone is not present. A local 57 kHz free running signal is generated, and this is then used to demodulate the RDS data in Non-Coherent mode.

Abstract translation: 在立体声FM广播电台不遵守RDS广播规范的情况下，基于计算的度量，在相干和非相干解调之间进行切换的方法。 重新利用现有的硬件解调单声道中的RDS数据。 使用非相干解调器和时间跟踪算法来求解剩余频偏。 RDS数据依赖于使用19 kHz导频音生成的57 kHz子载波。 在Mono广播中，导频不存在。 产生一个本地的57 kHz自由运行信号，然后用于解调非相干模式下的RDS数据。

公开(公告)号：WO2012054757A3

公开(公告)日：2012-06-14

申请号：PCT/US2011057145

申请日：2011-10-20

Applicant: QUALCOMM INC ,  VISHWANATH TG ,  BLESSENT LUCA ,  AKHAVAN KOOROSH ,  MASAMOTO JAMES T

Inventor： VISHWANATH TG ,  BLESSENT LUCA ,  AKHAVAN KOOROSH ,  MASAMOTO JAMES T

IPC: H04L27/233 ,  H04H40/54 ,  H04L7/00

CPC classification number: H04L27/2331 ,  H04H20/34 ,  H04L2027/0016 ,  H04L2027/0036 ,  H04L2027/0051 ,  H04L2027/0085

Abstract: A method of switching between Coherent and Non-Coherent demodulation based on computed metrics, in cases where stereo FM broadcasting stations do not adhere to RDS broadcast specifications. Re-utilizes existing hardware to demodulate RDS data in mono. The residual frequency offset is resolved using a Non Coherent demodulator and a time tracking algorithm. RDS data relies on the 57 kHz sub-carrier that is generated using 19 kHz pilot tone. In Mono broadcasting pilot tone is not present. A local 57 kHz free running signal is generated, and this is then used to demodulate the RDS data in Non-Coherent mode.

Abstract translation: 在立体声FM广播电台不遵守RDS广播规范的情况下，基于计算出的度量在相干和非相干解调之间切换的方法。 重新利用现有硬件解调单声道RDS数据。 剩余频率偏移使用非相干解调器和时间跟踪算法解决。 RDS数据依赖于使用19 kHz导频音生成的57 kHz子载波。 在单声道广播中不存在导频音。 生成一个本地57 kHz自由运行信号，然后用它来解调非相干模式下的RDS数据。