Sound Recording Solutions
Sound Card Recorder
Powerful voice activated microphone recorder for Windows. Click here to learn more.Bitrate Peeling
Bitrate Peeling is a technique used in Ogg Vorbis audio encoded streams, wherein a stream can be encoded at one bitrate but can be served at that or any lower bitrate. Bitrate Peeling is similar in overall effect to Real Networks' technology called "SureStream", which basically creates a single media clip that contains multiple bitrates. The purpose is provide access to the clip for people with slower Internet connections, and yet still allow people with faster connection to enjoy the higher quality content. The server automatically chooses which stream to deliver to the user, depending on user's connection speed. The difference between SureStream and Bitrate Peeling is that SureStream is limited to only a handful of pre-defined bitrates, with significant difference between them, and SureStream encoded files are big because they contain all of the bitrates used, while Bitrate Peeling uses much smaller steps to change the available bitrate and quality, and only the highest bitrate is used to encode the file/stream, which results in smaller files on servers. A SureStream encoded file is encoded at bitrates of 16 kbit/s, 32 kbit/s and 96 kbit/s. The file will be about the same in size as three separate files encoded at those bitrates and put together, or one file encoded at the sum of those bitrates, which is about 144 kbit/s (16+32+96). When a dial-up user has only about 28 kbit/s of bandwidth available, the Real server will serve the 16 kbit/s stream. If the dial-up connection is of higher quality, and maybe about 42 kbit/s is available, the server will automatically switch to the 32 kbit/s stream. A DSL or Cable Internet user will be served the 96 kbit/s stream. This looks good, but even though the user with 28 kbit/s can use a higher bitrate/higher quality stream (maybe 22 to 24 kbit/s), such thing can't be done with SureStream, unless the encoded file contains such a bitrate. This is where Bitrate Peeling comes into play. Contrary to SureStream, Bitrate Peeling requires only the highest bitrate to be used when encoding a file/stream, which is 96 kbit/s in this case. The obvious benefit is much smaller space on a server required by such a file. An additional feature of Bitrate Peeling is a much finer tuning of available bitrate/quality. Now, if a dial-up user with 28 kbit/s available bandwidth connects to an Ogg Vorbis file/stream, the server will "peel" the original 96 kbit/s file/stream down to the available bandwidth, the full 28 kbit/s (or 20 to 24 kbit/s, overhead reduces the effective bandwidth). This "peeling" process is different than transcoding because transcoding uncompresses the file and recompresses it (a computing-intensive process), whereas the peeling process "cuts the fat" by removing excess bits from the stream without using much processor time. If 42 kbit/s is available, the server will peel the 96 kbit/s down to the maximum available bandwidth, maybe about 36 to 40 kbit/s. The benefit of Bitrate Peeling, besides space savings / smaller files, is smaller steps in bitrate and quality, which means that whatever the currently available bandwidth, the streamed file will be of highest bitrate and quality possible for that bandwidth. These benefits are only theoretical, as the only Vorbis peeler available is still in experimental state and produces file qualities inferior to what transcoding the higher bitrate file to a lower bitrate would.
Phone Call Recorder
Must have software for voice modem. Record all phone calls automatically, watch Caller ID information, create you own powerful answering machine. Perfect sound quality. Click here to learn more.3d audio effect - 3gp - a-law - aac - acm - adc - aiff - aliasing - amplifier - amr-wb - amr-wb plus - amr - apev2 tag - asf - atrac - audio codec - audio compression - avi - bitrate - bitrate peeling - chord - codec - comfort noise - compact audio cassette - compact disc - compression - compression artifact - compression ratio - contact microphone - container format - dab - data compression - digital audio - digital camera - divx - dolby digital - dolby digital plus - dsp - dvd-audio - dvd - effects unit - equalization - ffmpeg - flanging - fourcc - frequency spectrum - hi-fi - high-end audio - hiln - id3 - joint stereo - laser microphone - line level - lossy - loudspeaker - matroska - mcf - microphone - midi - mixing console - mp2 - mp3 - mp3 surround - mp3 sx - mp3pro - mp4 - mpeg-1 - mpeg-21 - mpeg-3 - mpeg-4 - mpeg-7 - mpeg - mu-law - musepack - music - mxf - nut - osm - parabolic microphone - pcm - perception - phonograph - pink noise - pqf - psychoacoustics - qdesign - quadraphonic - radio receiver - ratdvd - realaudio - red noise - reverberation - rhythm - ribbon microphone - riff - rmvb - sbr - signal processing - sound - sound card - sound effects - sound recording - spdif - speech encoding - speech recognition - speex - stereo - subwoofer - surround sound - synthesizer - tape recorder - tdm - tweeter - video - video compression - vob - voice analysis - vorbis - wav - white noise - wma - woofer