RealAudio sipr - Revision history

Vitor: - Category:Formats missing in FFmpeg

2010-01-16T05:29:55Z

← Older revision		Revision as of 22:29, 15 January 2010
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	Codebook structure is similar to [[AMR-NB#12.2_kbps_mode_2\|AMR-NB's 12.2k mode]], except that no gray coding is used and each index is extended to 4 bits.		Codebook structure is similar to [[AMR-NB#12.2_kbps_mode_2\|AMR-NB's 12.2k mode]], except that no gray coding is used and each index is extended to 4 bits.

	~~[[Category:Formats missing in FFmpeg]]~~
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Vocoders]]		[[Category:Vocoders]]

Vitor: Have patch => !undiscovered

2009-09-03T04:50:12Z

Have patch => !undiscovered

← Older revision		Revision as of 21:50, 2 September 2009
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	Codebook structure is similar to [[AMR-NB#12.2_kbps_mode_2\|AMR-NB's 12.2k mode]], except that no gray coding is used and each index is extended to 4 bits.		Codebook structure is similar to [[AMR-NB#12.2_kbps_mode_2\|AMR-NB's 12.2k mode]], except that no gray coding is used and each index is extended to 4 bits.

	[[Category:~~Undiscovered Audio Codecs~~]]		[[Category:Formats missing in FFmpeg]]
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Vocoders]]		[[Category:Vocoders]]

Maxpol at 13:13, 4 September 2008

2008-09-04T13:13:32Z

← Older revision		Revision as of 06:13, 4 September 2008
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	Audio codec found in [[RealMedia]] files, not as common as [[RealAudio_cook\|cook]].		Audio codec found in [[RealMedia]] files, not as common as [[RealAudio_cook\|cook]].

	~~Allegedly~~ the same codec as [[ACELP.net]]. May be partly based on G.729, however RealAudio predates the finalization of the G.729 specifications for the 6.5 kbit/s and 11.8 kbit/s variants. [http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-G.729 ITU-T G.729 page]		It is the same codec as [[ACELP.net]]. May be partly based on G.729, however RealAudio predates the finalization of the G.729 specifications for the 6.5 kbit/s and 11.8 kbit/s variants. [http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-G.729 ITU-T G.729 page]

	Codec library with debugging symbols: [http://wwwa2.kph.uni-mainz.de/ftp/pub/machines/linux/multimedia/v50b3_linux20elf.tar.gz v50b3_linux20elf.tar.gz]		Codec library with debugging symbols: [http://wwwa2.kph.uni-mainz.de/ftp/pub/machines/linux/multimedia/v50b3_linux20elf.tar.gz v50b3_linux20elf.tar.gz]

Voroshil: /* Decode of LP filter parameters */

2008-05-02T07:16:09Z

Decode of LP filter parameters

← Older revision		Revision as of 00:16, 2 May 2008
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	=== LSF vectors decoding ===		=== LSF vectors decoding ===
	=== LSF to LSP vector conversion ===		=== LSF to LSP vector conversion ===
	Same as for [[AMR-NB#LSF_to_LSP_vector_conversion\|AMR-NB~~, 12.2k mode~~]], except that coefficients belongs to [0; 8000]Hz range and sampling rate is 16 kHz.		Same as for [[AMR-NB#LSF_to_LSP_vector_conversion\|AMR-NB]], except that coefficients belongs to [0; 8000]Hz range and sampling rate is 16 kHz.

	=== LSP vector interpolation ===		=== LSP vector interpolation ===
	Same as for [[AMR-NB#LSP_vector_interpolation_.28c.f._.C2.A75.2.6.29\|AMR-NB, 12.2k mode]], except that only two subframes are used.		Same as for [[AMR-NB#LSP_vector_interpolation_.28c.f._.C2.A75.2.6.29\|AMR-NB, 12.2k mode]], except that only two subframes are used.
	=== LSP to LP vector conversion ===		=== LSP to LP vector conversion ===
	Same as for [[AMR-NB#LSP_vector_to_LP_filter_coefficient_conversion_.28c.f._.C2.A75.2.4.29\|AMR-NB~~'s 12.2k mode~~]]		Same as for [[AMR-NB#LSP_vector_to_LP_filter_coefficient_conversion_.28c.f._.C2.A75.2.4.29\|AMR-NB ]]

	== Decoding of the pitch (adaptive codebook) vector ==		== Decoding of the pitch (adaptive codebook) vector ==

Voroshil: /* LSP to LP vector conversion */

2008-05-02T07:10:22Z

LSP to LP vector conversion

← Older revision		Revision as of 00:10, 2 May 2008
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	Same as for [[AMR-NB#LSP_vector_interpolation_.28c.f._.C2.A75.2.6.29\|AMR-NB, 12.2k mode]], except that only two subframes are used.		Same as for [[AMR-NB#LSP_vector_interpolation_.28c.f._.C2.A75.2.6.29\|AMR-NB, 12.2k mode]], except that only two subframes are used.
	=== LSP to LP vector conversion ===		=== LSP to LP vector conversion ===
			Same as for [[AMR-NB#LSP_vector_to_LP_filter_coefficient_conversion_.28c.f._.C2.A75.2.4.29\|AMR-NB's 12.2k mode]]

	== Decoding of the pitch (adaptive codebook) vector ==		== Decoding of the pitch (adaptive codebook) vector ==

Voroshil: /* 16 Kbps Voice */

2008-05-02T07:05:19Z

16 Kbps Voice

← Older revision		Revision as of 00:05, 2 May 2008
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	3 16 Kbps Voice		3 16 Kbps Voice

	= 16 Kbps Voice =		= 16 Kbps Voice Format description =
	* Sampling rate is 16000 Hz.		* Sampling rate is 16000 Hz.
	* Each frame is 160 samples long and represents 10ms of speech data.		* Each frame is 160 samples long and represents 10ms of speech data.

Voroshil at 07:04, 2 May 2008

2008-05-02T07:04:55Z

← Older revision		Revision as of 00:04, 2 May 2008
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	3 16 Kbps Voice		3 16 Kbps Voice

	=== 16 Kbps Voice ===		= 16 Kbps Voice =
	* Sampling rate is 16000 Hz.		* Sampling rate is 16000 Hz.
	* Each frame is 160 samples long and represents 10ms of speech data.		* Each frame is 160 samples long and represents 10ms of speech data.
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	== Bit stream frame format ==		== Bit stream frame format ==
	~~=== 16 Kbps Voice ===~~

	{\|border =1		{\|border =1
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	\|}		\|}

	==Decoding of the pitch (adaptive codebook) vector==		== Decode of LP filter parameters ==
			=== LSF vectors decoding ===
			=== LSF to LSP vector conversion ===
			Same as for [[AMR-NB#LSF_to_LSP_vector_conversion\|AMR-NB, 12.2k mode]], except that coefficients belongs to [0; 8000]Hz range and sampling rate is 16 kHz.

			=== LSP vector interpolation ===
			Same as for [[AMR-NB#LSP_vector_interpolation_.28c.f._.C2.A75.2.6.29\|AMR-NB, 12.2k mode]], except that only two subframes are used.
			=== LSP to LP vector conversion ===

			== Decoding of the pitch (adaptive codebook) vector ==
	=== Decode pitch lag ===		=== Decode pitch lag ===
	~~==== 16 Kbps Voice, 1/3 resolution ====~~

	In the first subframe, a fractional pitch lag is used with resolutions:		In the first subframe, a fractional pitch lag is used with resolutions:
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	==Decoding of the innovative (algebraic or fixed codebook) vector==		==Decoding of the innovative (algebraic or fixed codebook) vector==
	=== Decoding the pulse positions ===		=== Decoding the pulse positions ===
	~~==== 16 Kbps Voice ====~~
	The fixed codebook vector is reconstructed using 10 pulses in 5 overlapping tracks.		The fixed codebook vector is reconstructed using 10 pulses in 5 overlapping tracks.
	Pulses in each track are encoded using 9 bits:		Pulses in each track are encoded using 9 bits:

Voroshil: /* 16 Kbps Voice */

2008-05-02T06:43:20Z

16 Kbps Voice

← Older revision		Revision as of 23:43, 1 May 2008
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	<references/>		<references/>

			Codebook structure is similar to [[AMR-NB#12.2_kbps_mode_2\|AMR-NB's 12.2k mode]], except that no gray coding is used and each index is extended to 4 bits.


	[[Category:Undiscovered Audio Codecs]]		[[Category:Undiscovered Audio Codecs]]
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Vocoders]]		[[Category:Vocoders]]

Voroshil at 06:34, 2 May 2008

2008-05-02T06:34:45Z

← Older revision		Revision as of 23:34, 1 May 2008
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			== Summary ==

	* FOURCC: sipr		* FOURCC: sipr
	* Company: [[Real\|RealNetworks]]		* Company: [[Real\|RealNetworks]]
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	3 16 Kbps Voice		3 16 Kbps Voice

	~~== Summary ==~~
	=== 16 Kbps Voice ===		=== 16 Kbps Voice ===
	* Sampling rate is 16000 Hz.		* Sampling rate is 16000 Hz.

Voroshil: /* Bit stream frame format */

2008-05-02T06:31:55Z

Bit stream frame format

← Older revision		Revision as of 23:31, 1 May 2008
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	2 5 Kbps Voice		2 5 Kbps Voice
	3 16 Kbps Voice		3 16 Kbps Voice

			== Summary ==
			=== 16 Kbps Voice ===
			* Sampling rate is 16000 Hz.
			* Each frame is 160 samples long and represents 10ms of speech data.
			* Bitstream rate is 16 Kbps

	== Bit stream frame format ==		== Bit stream frame format ==