- published: 01 Dec 2013
- views: 0
3:06
Weird Facts μ-law algorithm
Facts μ-law algorithm The micro-law algorithm is a companding algorithm primarily used i...
published: 01 Dec 2013
Weird Facts μ-law algorithm
Weird Facts μ-law algorithm
Facts μ-law algorithm The micro-law algorithm is a companding algorithm primarily used in the digital telecommunication systems of North America and JapanCompanding algorithms reduce the dynamic range of an audio signalIn anal μ-law algorithm Source Wikipedia- published: 01 Dec 2013
- views: 0
3:03
Weird Facts Algorithm
Facts Algorithm In mathematics and computer science an algorithm is a step-by-step proce...
published: 04 Dec 2013
Weird Facts Algorithm
Weird Facts Algorithm
Facts Algorithm In mathematics and computer science an algorithm is a step-by-step procedure for calculationsAlgorithms are used for calculation data processing and automated reasoningAn algorithm is an effective me Algorithm Source Wikipedia- published: 04 Dec 2013
- views: 0
4:01
Weird Facts Talk:Coyote
Facts Talk:Coyote Untitled Could you put in the evilutionary chain please and a time line...
published: 01 Dec 2013
Weird Facts Talk:Coyote
Weird Facts Talk:Coyote
Facts Talk:Coyote Untitled Could you put in the evilutionary chain please and a time line with a geo-pattern? Speed "During pursuit a coyote may reach speeds up to 43 mph " This is the same speed given for greyhoun Talk:Coyote Source Wikipedia- published: 01 Dec 2013
- views: 0
1:52
Weird Facts Nissan S-Cargo
Facts Nissan S-Cargo The Nissan S-Cargo is a small retro commercial van manufactured by Ni...
published: 01 Dec 2013
Weird Facts Nissan S-Cargo
Weird Facts Nissan S-Cargo
Facts Nissan S-Cargo The Nissan S-Cargo is a small retro commercial van manufactured by NissanThe styling of the S-Cargo was directly inspired by the appearance of the small postwar French Citroen 2CV Fourgonnette delivery van; i Nissan S-Cargo Source Wikipedia- published: 01 Dec 2013
- views: 2
4:04
Strange Facts .357 SIG
Facts .357 SIG The .357 SIG pistol cartridge is the product of Swiss-German firearms manuf...
published: 01 Dec 2013
Strange Facts .357 SIG
Strange Facts .357 SIG
Facts .357 SIG The .357 SIG pistol cartridge is the product of Swiss-German firearms manufacturer SIG Sauer in cooperation with the American ammunition manufacturer Federal CartridgeWhile it is based on a .40 S&W; case neck .357 SIG Source Wikipedia- published: 01 Dec 2013
- views: 2
7:31
G.729
G.729 is an audio data compression algorithm for voice that compresses digital voice in pa...
published: 05 Dec 2013
G.729
G.729
G.729 is an audio data compression algorithm for voice that compresses digital voice in packets of 10 milliseconds duration. It is officially described as Coding of speech at 8 kbit/s using code-excited linear prediction speech coding . Because of its low bandwidth requirements, G.729 is mostly used in Voice over Internet Protocol (VoIP) applications where bandwidth must be conserved, such as conference calls. Standard G.729 operates at a bit rate of 8 kbit/s, but there are extensions, which provide rates of 6.4 kbit/s (Annex D, F, H, I, C+) and 11.8 kbit/s (Annex E, G, H, I, C+) for worse and better speech quality, respectively. G.729 has been extended with various features, commonly designated as G.729a and G.729b. The differences between these versions are noteworthy because they each have additional properties and thus different use-cases: G729: original codec and uses high complexity algorithm G729A or A annex: medium complexity variant of G.729 and it is compatible with G729. It is less complex but has slightly lower voice quality G729B or B annex: G729 with silence suppression and not compatible with the previous ones. G729AB: G729A with silence suppression and only compatible with G729B. Dual-tone multi-frequency signaling (DTMF), fax transmissions, and high-quality audio cannot be transported reliably with this codec. DTMF requires the use of the RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals as specified in RFC 2833. G.729 Annex A G.729a is a compatible extension of G.729, but requires less computational power. This lower complexity, however, bears the cost of marginally reduced speech quality. G.729a was developed by a consortium of organizations: France Telecom, Mitsubishi Electric Corporation, Nippon Telegraph and Telephone Corporation (NTT) The features of G.729a are: Sampling frequency 8 kHz/16-bit (80 samples for 10 ms frames) Fixed bit rate (8 kbit/s 10 ms frames) Fixed frame size (10 bytes for 10 ms frame) Algorithmic delay is 15 ms per frame, with 5 ms look-ahead delay G.729a is a hybrid speech coder which uses Algebraic Code Excited Linear Prediction (ACELP) The complexity of the algorithm is rated at 15, using a relative scale where G.711 is 1 and G.723.1 is 25. PSQM testing under ideal conditions yields Mean Opinion Scores of 4.04 for G.729a, compared to 4.45 for G.711 (μ-law) PSQM testing under network stress yields Mean Opinion Scores of 3.51 for G.729a, compared to 4.13 for G.711 (μ-law) Some VoIP phones incorrectly use the description "G729a/8000" in SDP (eg this affects some Cisco and Linksys phones). This is incorrect as G729a is an alternative method of encoding the audio, but still generates data decodable by either G729 or G729a - i.e. there is no difference in terms of codec negotiation. Since the SDP RFC allows static payload types to be overridden by the textual rtpmap description this can cause problems calling from these phones to endpoints adherring to the RFC unless the codec is renamed in their settings since they will not recognise 'G729a' as 'G729' without a specific workaround in place for the bug. G.729 Annex B G.729 has been extended in Annex B (G.729b) which provides a silence compression method that enables a voice activity detection (VAD) module. It is used to detect voice activity in the signal. It also includes a discontinuous transmission (DTX) module which decides on updating the background noise parameters for non speech (noisy frames). It uses 2-byte Silence Insertion Descriptor (SID) frames transmitted to initiate comfort noise generation (CNG). If transmission is stopped, and the link goes quiet because of no speech, the receiving side might assume that the link has been cut. By inserting comfort noise, analog hiss is simulated digitally during silence to assure the receiver that the link is active and operational. Other extensions Recently, G.729 has been extended (with Annex J) to provide support for wideband speech and audio coding, i.e., the transmitted acoustic frequency range is extended to 50 Hz - 7 kHz. The respective extension to G.729 is referred to as G.729.1. The G.729.1 codec is hierarchically organized: Its bit rate and the obtained quality are adjustable by simple bitstream truncation. Licensing G.729 includes patents from several companies and is licensed by Sipro Lab Telecom. Sipro Lab Telecom is the authorized Intellectual Property Licensing Administrator for G.729 technology and patent pool. In a number of countries, the use of G.729 may require a license fee and/or royalty fee. RTP Payload G.729 is assigned the static payload type 18 for RTP by IANA. The correct rtpmap description for this payload type is "G729/8000". Attribution: Article text available under CC-BY-SA- published: 05 Dec 2013
- views: 0
3:19
Weird Facts Ōgon Bat
Facts Ōgon Bat ogon Bat is a seminal Japanese superhero created by writer Ichiro Suzuki a...
published: 01 Dec 2013
Weird Facts Ōgon Bat
Weird Facts Ōgon Bat
Facts Ōgon Bat ogon Bat is a seminal Japanese superhero created by writer Ichiro Suzuki and illustrator Takeo Nagamatsu in 1930ogon Bat is considered to be the first Japanese superheroCharacter history The characte Ōgon Bat Source Wikipedia- published: 01 Dec 2013
- views: 0
3:05
Weird Facts Dynamin
Facts Dynamin Dynamin is a GTPase responsible for endocytosis in the eukaryotic cellDynami...
published: 04 Dec 2013
Weird Facts Dynamin
Weird Facts Dynamin
Facts Dynamin Dynamin is a GTPase responsible for endocytosis in the eukaryotic cellDynamins are principally involved in the scission of newly formed vesicles from the membrane of one cellular compartment and their targeti Dynamin Source Wikipedia- published: 04 Dec 2013
- views: 0
