Convert THD to SPX (Speex)

FLV MP3 Converter converts THD to SPX (Speex) easily and quickly. Speex is an Open Source/Free codec patent-free audio compression format designed for speech. The Speex codec aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs.

FLV MP3 Converter is also a professional audio conversion software. The software supports almost any video and audio formats such as AC3, DTS, AAC, M4A (MPEG-4 audio), WMA, FLAC, CAF (Core Audio Format), M4R (iPhone ringtone), MKA, AU, etc. It could convert TS to AAC, CAF to SPX, MLP to CAF (Core Audio Format), MPG to AAC for iPod/iPhone/iPad/iTunes/DSi, DVD to FLAC, CAF to OGG, MPA to WMA, SHN to AU, and so on.

FLV MP3 Converter supports batch conversion and, is full compatible with 32-bit and 64-bit editions of Vista and Windows 7.

What is THD?
Dolby TrueHD, it is an advanced lossless multi-channel audio codec developed by Dolby Laboratories which is intended primarily for high-definition home-entertainment equipment such as Blu-ray Disc and HD DVD. It is the successor to the AC-3 Dolby Digital surround sound codec which was used as the audio standard for DVD discs. In this application, Dolby TrueHD competes with DTS-HD Master Audio, another lossless codec from Digital Theater System.

Dolby TrueHD uses Meridian Lossless Packing (MLP) as its mathematical basis for compressing audio samples. MLP was used on the earlier DVD-Audio format, but details of Dolby TrueHD and DVD-Audio differ substantially. A Dolby TrueHD bitstream can carry up to 14 discrete sound channels. Sample depths up to 24 bits/sample and audio sample rates up to 192 kHz are supported. Like the more common legacy codec Dolby Digital, Dolby TrueHD bitstreams carry program metadata. Metadata is separate from the coding format and compressed audio samples, but stores relevant information about the audio waveform. For example, dialog normalization and Dynamic range compression are controlled by metadata embedded in the TrueHD bitstream.

In the Blu-ray specification, Dolby TrueHD is an optional codec. Dolby TrueHD audiotracks may carry up to 24 bit audio in up to 8 discrete audio channels at 96 kHz or up to 2 channels at 192 kHz. The maximum encoded bitrate is 18 Mbit/s (the same as the uncompressed rate). Since TrueHD is an optional codec, a separate (primary) AC-3 audiotrack must be present on Blu-ray discs that contain a TrueHD track.

What is SPX?
Speex is a patent-free audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts. It is based on the CELP speech coding algorithm. Speex claims to be free of any patent restrictions and is licensed under the revised (3-clause) BSD license. It may be used with the Ogg container format or directly transmitted over UDP/RTP. The Speex designers see their project as complementary to the Vorbis general-purpose audio compression project. Speex is a lossy format, meaning quality is permanently degraded to reduce file size. Speex is based on CELP and is designed to compress voice at bitrates ranging from 2 to 44 kbps. Some of Speex's features include:

• Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream
• Intensity stereo encoding
• Packet loss concealment
• Variable bitrate operation (VBR)
• Voice Activity Detection (VAD)
• Discontinuous Transmission (DTX)
• Fixed-point port
• Acoustic echo canceller
• Noise suppression

Note that Speex has a number of features that are not present in other codecs, such as intensity stereo encoding, integration of multiple sampling rates in the same bitstream (embedded coding), and a VBR mode.

Step-by-Step Instructions to Convert THD to SPX (Speex):

1. Click Here to Download FLV MP3 Converter
2. Install the Software by Instructions
3. Launch FLV MP3 Converter by Clicking Start -> All Programs -> FLV MP3 Converter -> FLV MP3 Converter
4. Choose THD Files


Click "Add Files" to choose THD files.


Choose one or more THD files you want to convert and then click Open.

FLV MP3 Converter will open THD files and get file information of the file such as duration, bit rate, sample rate, and channels, and then show the information of THD file at conversion list.



5. Choose Output Format


Choose "to SPX (Speex)" at Output Format combo-box.


6. [Optional, for advanced user] Set SPX Encoding Parameters


If you want to change SPX encoding parameters such as bit rate, sample rate, channels, or volume, please click "Options".


And then, switch to tab "Audio" and choose "SPX (Speex) (*.spx)" at "Output Format", and then set encoding parameters.


7. Convert THD to SPX (Speex)


Click "Convert" to convert THD files to SPX (Speex).


FLV MP3 Converter is converting THD files to SPX (Speex).


8. Play and Browse SPX File


When conversion completes, you can right-click converted item and choose "Play Destination" to play the outputted SPX file; or choose "Browse Destination Folder" to open Windows Explorer to browse the outputted SPX file.


9. Done

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THD to SPX Conversion Software is 100% clean and safe to install. It's certified by major download sites.

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