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Systems and methods for fine alignment of analog and digital signal pathways

By separating and aligning the digital and analog parts of the radio broadcast signal in the radio receiver, delay technology is used to achieve time alignment within +/-3 sample accuracy, solving the problem of insufficient alignment accuracy in the existing technology. problem, achieving high-quality audio signal processing.

Active Publication Date: 2011-08-31
IBIQUITY DIGITAL CORP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is some blocking which sufficiently "takes out" the baseband and thus creates gaps in the reception of the audio signal

Method used

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Embodiment Construction

[0027] Figures 1 to 7 and the accompanying description herein provide a general description of an exemplary IBOC system, an exemplary broadcast device structure and operation, and an exemplary receiver structure and operation. Figures 8 to 11and the accompanying description herein provide a detailed description of an exemplary method for temporally aligning digital and analog signals in a digital radio broadcast receiver. While aspects of the present disclosure are presented in the context of an exemplary IBOC system, it should be understood that the present disclosure is not limited to IBOC systems and that the teachings herein are applicable to other forms of digital and analog radio broadcasting as well. Furthermore, embodiments of the present disclosure can be applied to both AM and FM analog signals.

[0028] See attached picture, figure 1 is a block diagram of an exemplary digital radio broadcast transmitter 10 that broadcasts digital audio broadcast signals. For e...

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Abstract

Methods and systems are disclosed for temporally aligning audio samples of digital and analog portions of a radio broadcast signal. The methods and systems comprise the steps of receiving a radio broadcast signal having analog and digital portions, producing audio samples of the analog and digital portions, retrieving a stored first time interval corresponding to an approximate time for the digital samples to traverse a receiver digital signal path, measuring a second time for data representing the digital portion to travel from a digital signal path input to a digital demodulator, generating temporal alignment of the digital audio samples relative to the analog audio samples by delaying the digital audio samples by the sum of the first and second times, temporally aligning the digital and analog samples to within a predetermined amount, and digitally combining the first and second audio samples to produce a combined audio output.

Description

[0001] This application claims priority to US Patent Application No. 12 / 219,989, filed July 31, 2008, the entire contents of which are hereby incorporated by reference. technical field [0002] The present disclosure relates to radio broadcast receivers and, in particular, to methods and systems for fine alignment of analog and digital signal paths in radio receivers. Background technique [0003] Digital radio broadcasting technology delivers digital audio and data services to mobile, portable and stationary receivers. One type of digital radio known as in-band on-frequency (IBOC) digital radio uses terrestrial transmitters in existing medium frequency (MF) and very high frequency (VHF) radio bands. HD Radio developed by iBiquity Digital TM technology is an example of an IBOC implementation for digital radio broadcast and reception. [0004] IBOC digital radio broadcast signals may be transmitted in a hybrid format comprising an analog modulated carrier combined with mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/00
CPCH04H60/12H04H2201/186H04L5/06H04L27/10H04L27/2601H04L27/02H04H2201/183H04H20/30
Owner IBIQUITY DIGITAL CORP
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