daptive ifferential ulse ode odulation; a method for digitizing and compressing speech data.

ADPCM-32 is a 32-bit voice compression method that converts analog signals to digital data, thus allowing voice transmission over digital lines.

Adapted Differential Pulse Code Modulation. A technique for converting a voice into digital signals.

(Adaptive Differential Pulse Code Mode): ADPCM is a compression standard that allows the encoding of PCM data at rates of 40, 32, 24 and 16 kbps. Defined by the ITU standard G.726. ADPCM running at 32 kbps is often used as the definition of "toll" quality, or quality that is comparable or superior to that of the PSTN today.

(Adaptive Digital Pulse Code Modulation) An A/D conversion that produces a digital signal with a lower bit-rate than standard PCM. ADPCM produces a lower bit-rate by recording only the difference between samples and adjusting the coding scale dynamically to accommodate large and small differences.

Acronym for Adaptive Delta Pulse Code Modulation. A type of Codec that typically offers about 4:1 audio data compression with relatively high audio quality. Various versions of ADPCM algorithms are generally and freely available. ADPCM2 is not the same as standard ADPCM. This 4 bit compressed format is proprietary and is included as an option in Sigtuna recording software. It is recommended that this codec not be used. Only DAISY playback devices can play this format.

An ITU standard technique for encoding analog voice signals into a digital form at 32 kbps (half the standard PCM rate).

Adaptive Differential Pulse Code Modulation. High quality audio compression algorithm. Used in CD-ROM XA and CD-I standards. The compression is obtained by not storing the full sample values (16 bit), but only the difference (4 or 8 bit) between consecutive samples. Three (quality-) levels are defined:- Level A: 8 bit per sample, 37.8kHz samplerate (bandwidth: 18kHz)- Level B: 4 bit per sample, 37.8kHz samplerate (bandwidth: 18kHz)- Level C: 4 bit per sample, 18.9kHz samplerate (bandwidth: 9kHz) Bandwidth of a uncompressed (linear) PCM signal, as used with e.g. the audio (CD-DA, 44.1kHz, 16bit) is 20kHz. Use of ADPCM provides a reduction of up to 16 times (Level C), compared to linear PCM.

Adaptive Differential Pulse Code Modulation. A form for the digital coding voice signals, typically at 32 Kbps.

Adaptive Differential PCM (codec)

Adaptive Differential Pulse Code Modulation. Encoding technique (ITU-T) that allows analog voice signals to be carried on a 32K bps digital channel. Sampling is done at 8 kHz with 3 or 4 bits used to describe the difference between adjacent samples.

Adaptive Differential Pulse Code Modulation compression technique that encodes only the difference between sequential samples.

Adaptive Differential Pulse Code Modulation. A ITU-TS standard technique for voice encoding and compression. It allows an analog to be carried within a 32Kbit/s digital channel.

Adaptive Differential Pulse Code Modulation. A form of PCM that produces a digital signal with a lower bit rate than standard PCM.

ADPCM is a technique for converting sound or analog information to binary information (a string of 0s and 1s) by taking frequent samples of the sound and expressing the value of the sampled sound modulation in binary terms. ADPCM is used to send sound on fiber optic long distance lines as well as to store sound along with text, images, and code on a CDROM.

Adaptive Differential Pulse Code Modulation; a form of voice compression that typically uses 32kbit/s Advice of charge

Adaptive Differential Pulsation Code Modulation more...

Adaptive Differential Pulse Code Modulation. A sophisticated compression algorithm for digitizing audio that stores the differences between successive samples rather than the absolute value of each sample. This method of digitization also reduces storage requirements from 64K bits/second to as low as 24K bits/second.

Adaptive delta pulse code modulation. An audio compression algorithm for digital audio based on describing level differences between adjacent samples.

Adaptive Differential Pulse Code Modulation is an audio encoding procedure (often referred to as compression algorithm) that takes about half the space of standard PCM, and involves different sampling rates and bits per sample, algorithms and chips to produce up to 20 hours of Level C, monaural audio in one CD. 'Differential' (often called 'Delta') refers to the way the algorithms determine and record only the differences between one signal and the next, using 4-bit numbers--thus reducing the total length of code. It is implemented with interleaving in CD-I and CD-ROM-XA applications.

Adaptive differential pulse code modulation. A compression technique which encodes the difference between one sample and the next. Variations are lossy and lossless.

Adaptive Differential Pulse Code Modulation is an audio encoding compression technique that encodes the difference between the predicted value of the signal instead of the absolute value of the original waveform so that the compression efficiency is improved. This difference is usually small and can thus be encoded in fewer bits than the sample itself. ADPCM is used in PC sound cards, on CD-i and CD-ROM XA discs.

Adaptive Differential Pulse Code Modulation: An encoding format for storing audio information in a digital format.

An encoding technique, standardized by the ITU-T, that allows analog voice signals to be carried on a 32Kbps digital channel. The voice input is samples at 8KHz with 4 bits used to describe the difference between adjacent samples.

This method of encoding sound data files takes up less storage space than the regular PCM format used by WAV and AIFF files--and CD audio for that matter. ADPCM comes in more than one flavor: IMA's ADPCM, for example, is used on the Sony MiniDisc to cram more data onto a smaller platter; Microsoft's ADPCM is used as part of Windows canon of audio codecs. Many MP3 players use ADPCM for their voice-recording feature.

A more efficient form of pulse code modulation, in which the previous sample is used to predict the value of the current sample

If you buy a portable digital audio player and it has a voice recording feature, the recordings you make will be encoded in the ADPCM format. ADPCM encoding creates much smaller files than MP3 does because it's best suited to spoken audio that doesn't have complex sound.

Adaptive Differential Pulse Code modulation. A technique used to transmit data with a rate of 32Kbps

Adaptive Differential Pulse Code Modulation. A method of sampling and converting analog signals to digital signals. Similar to DPCM except that when a wide difference occurs between two successive samples of a signal, it uses a sophisticated algorithm to code the difference.

Compressed WAV format. ADPCM (Adaptive Differential Pulse Code Modulation) is an audio compression scheme which compresses from 16-bit to 4-bit for a 4:1 compression ratio.

Adaptive Differential Pulse Code Modulation. A compression technique that records only the difference between samples and adjusts the coding scale dynamically to accommodate large and small differences. ADPCM is simple to implement, but introduces much white noise.

Adaptive Differential Pulse Code Modulation. A PCM encoding technique that uses only 4 bits to encode an analog sample. By adapting the quantizing range to the difference between the two samples, it achieves the same voice quality as 8-bit PCM, but with 32 Kbps instead of 64 Kbps.

Adaptive differential pulse code modulation. Process by which analog voice samples are encoded into high-quality digital signals.

Adaptive Differential Pulse Coded Modulation

Adaptive Differential Pulse Code Modulation; coding of speech at 32 Kbps