Title:
信号レベルを維持する装置
Document Type and Number:
Japanese Patent JP4012534
Kind Code:
B2
Abstract:
In a broadcast system having a complex waveform of digital and analog segments, frame timing is recovered and the frame synchronous power of the digital portion of the composite AM compatible Digital Audio Broadcast (DAB) waveform is measured by examining a portion of the signal. The frame timing necessary for proper demodulation is recovered from the received signal, and a signal power measurement for scaling is provided. The composite AM compatible DAB waveform is produced by a modulation method in which a digital representation of an audio signal is encoded together with an analog amplitude modulated (AM) signal and transmitted simultaneously in the same frequency channel.
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Inventors:
Carlin, Barry W
Dapper, Mark Jay
Guile, Michael Jay
Dapper, Mark Jay
Guile, Michael Jay
Application Number:
JP2004298584A
Publication Date:
November 21, 2007
Filing Date:
October 13, 2004
Export Citation:
Assignee:
Ibiquity Digital Corporation
International Classes:
H04J11/00; H04H20/36; H04H20/49; H04H40/27; H04L5/02; H04L7/00; H04L27/26
Domestic Patent References:
| JP7226725A | ||||
| JP2246428A |
Foreign References:
| WO1995007576A1 |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa