speech format definition of speech format in the Free Online Encyclopedia.

codec examples

Following is a list of popular speech, audio and video codecs. A codec is the circuit that performs the conversion from analog to digital or digital to digital (see codec).

Speech is a Subset of Audio
Audio codecs cover all sound whether spoken words or music. However, in order to create the most compressed digital data, speech codecs look for sound patterns commonly heard in a spoken language.

  SPEECH CODECS

  Name            Purpose

  A-Law           PCM telephone circuit (Europe)
  µ-Law           PCM telephone circuit (U.S.)

  DV Audio        MiniDV audio

  GSM 6.10        GSM cellphone

  G.711           A/V conferencing (ITU)
  G.722           A/V conferencing (ITU)
  G.723.1         VoIP, A/V conferencing (ITU)
  G.728           A/V conferencing (ITU)
  G.729           A/V conferencing (ITU)

  AMR-NB          GSM, 3GPP (ETSI narrowband)
  AMR-WB          GSM, 3GPP (ETSI wideband)
  ACELP.net       General speech (VoiceAge)
  ACELP.wide      High quality (VoiceAge)


  AUDIO CODECS

  Name            Purpose

  MP2             Video soundtrack (MPEG)
  MP3             Music (MPEG)

  AAC             Music (MPEG)
  AAC Protected   Music (MPEG with DRM)

  WMA             Music (Windows)
  WMA Protected   Music (Windows with DRM)
  WMA Lossless    Music (Windows lossless)

  RA, RAM         Music (RealNetworks streaming)
  AIFF            Music (Macintosh)
  AU              Music (Sun)
  ACELP.live      Music (VoiceAge)
  Ogg Vorbis      Music (open source)
  FLAC            Music (open source lossless)
  Apple Lossless  Music (lossless)

  DSD             Music (high-resolution SACD)
  DVD-Audio       Music (high-resolution audio)

  Dolby Digital   Movie tracks
  DTS             Movie tracks


  VIDEO CODECS

  Name            Purpose

  MPEG-1          Movies (Video CD)
  MPEG-2          Movies (DVD)
  MPEG-4          Movies (DivX, etc.)
  H.264           Movies (Enhanced MPEG-4)

  FLV             Movies (Flash format)

  VC-1            Movies (SMPTE)

  AVI             Movies (Windows)
  WMV             Movies/Streaming (Windows)
  RM, RV          Movies/Streaming (RealNetworks)
  Indeo           Movies (Intel)
  Cinepak         Movies (SuperMac Technologies)
  Sorenson        Movies (Sorenson Media)

  H.261           Videoconferencing (ITU)
  H.263           Videoconferencing (ITU)

Conversion and Compression

Compressing audio and video is a two-stage process. The first stage converts the signals from the source into an uncompressed digital format. At that point, one of several compression algorithms is used to further compress the digital code.

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No references found	There has been a lot of talk in the music radio industry recently about speech formats not working in commercial terms - but we are proving them wrong. CELEBRITY WATCH : Wogan still best; Radio 2's veteran DJs are setting ... by Daily Post (Liverpool, England) Verizon Business - Produced with the CA Department of Transportation, an automated Interactive Voice Response service updating highway conditions every minute, processing it into speech format and distributing the update to the calling public, thus ensuring up-to-the-minute highway information. "Best Solutions" Awards announced at GTC West's Conference on ... by Business Wire The Micronas MAS 3509F application board handles various audio and speech formats such as MP3, AAC and G. Micronas Next Generation Application Board Will Support SanDisk's ... by Business Wire	speculative builder speculative evaluation speculative execution Speculative Knowledge Speculative Promotion speculum speculum alloy Speculum Ducks specus Spee, Maximilian Von Spee, Maximilian, Graf von Speech speech act theory speech amplifier Speech Application Programming Interface speech bandwidth speech clipper speech clipping speech codec speech coder speech coil speech compression Speech Culture speech day speech defect speech format speech frequency Speech from the Throne speech intelligibility speech interference level speech interpolation speech inverter Speech Mechanisms Speech perception speech recognition Speech Recognition Application Program Interface speech scrambler Speech Sounds speech synthesis speech therapy Speech, Artistic Speech, Dramatic speech, freedom of speed speed buffering speed camera speed circle speed cone speed control speed density metering Speed Doubler	speech defect speech defect speech deficit speech deficit speech deficit speech deficit Speech delay speech device speech device speech device speech device Speech disfluencies speech disorder speech disorder speech disorder speech disorder Speech disorders Speech disorders Speech disturbances Speech disturbances Speech Driven Embodied Interaction Robot Speech Driven Facial Animation Speech Driven Information System Speech Driven Multi-Modal Automatic Directory Assistance speech dysfunction speech dyspraxia Speech Emotion Verification System Speech Enabled Storz Communication Bus Module Speech Enhancement Assessment Resource Speech Facilities for the Reading Disabled speech format speech formats speech frequency Speech from the Throne Speech from the Throne Speech from the Throne Speech Generating Device Speech Handicap Speech Handler Speech Hearing and Language Research Centre Speech impairment Speech impairment Speech impairment Speech impediment Speech impediment Speech impediment Speech impediment speech impediments speech impediments speech impediments speech impediments Speech Importance Noise Detection Threshold Speech in Noise Speech Information Technology and Industry Promotion Center speech intelligibility speech intelligibility Speech Intelligibility Rating Speech Interface for Data Exploitation and Retrieval Speech Interference Level Speech Interference Level speech interpolation

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No references found

There has been a lot of talk in the music radio industry recently about speech formats not working in commercial terms - but we are proving them wrong.

CELEBRITY WATCH : Wogan still best; Radio 2's veteran DJs are setting ... by Daily Post (Liverpool, England)

Verizon Business - Produced with the CA Department of Transportation, an automated Interactive Voice Response service updating highway conditions every minute, processing it into speech format and distributing the update to the calling public, thus ensuring up-to-the-minute highway information.

"Best Solutions" Awards announced at GTC West's Conference on ... by Business Wire

The Micronas MAS 3509F application board handles various audio and speech formats such as MP3, AAC and G.

Micronas Next Generation Application Board Will Support SanDisk's ... by Business Wire

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