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Siren is a family of patented, transform-based, wideband audio coding formats and their audio codec implementations developed and licensed by PictureTel Corporation (acquired by Polycom, Inc. in 2001). [1] There are three Siren codecs: Siren 7, Siren 14 and Siren 22.
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
G.722.1 Annex C (or G.722.1C) is a low-complexity extension mode to G.722.1, which doubles the algorithm to permit 14 kHz audio bandwidth using a 32 kHz audio sample rate, at 24, 32, and 48 kbit/s. It is included in the official ITU-T Recommendation G.722.1. The name of this annex is Annex C – 14 kHz mode at 24, 32, and 48 kbit/s. [5]
10 and 15 HP models were nearly the same, aside from motor used. The P-50 was and still is the loudest dual tone siren in the world. The P-15 (Single-tone) and P-50 were still being produced by ASC until 2002 and 2007, under different names (P-15 being the RM-127 and the P-50 being the RM-135/T-135 AC). The PN-20 was the last siren made by ACA.
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In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
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