Audio signal quality

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  • Today, digital audio applications are part of our everyday lives. Popular examples include audio CDs, MP3 audio players, radio broadcasts, TV or video DVDs, video games, digital cameras with sound track, digital camcorders, telephones, telephone answering machines and telephone enquiries using speech or word recognition.

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  • Typical audio signal classes are telephone speech, wideband speech, and wideband audio, all of which differ in bandwidth, dynamic range, and in listener expectation of offered quality. The quality of telephone-bandwidth speech is acceptable for telephony and for some videotelephony and video-conferencing services.

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  • Overview In order to more efficiently transmit or store high-quality audio signals, it is often desirable to reduce the amount of information required to represent them. In the case of digital audio signals, the amount of binary information needed to accurately reproduce the original pulse code modulation (PCM) samples may be reduced by applying

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  • PCM Bit Rates Typical audio signal classes are telephone speech, wideband speech, and wideband audio, all of which differ in bandwidth, dynamic range, and in listener expectation of offered quality. The quality of

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  • In order to more efficiently transmit or store high-quality audio signals, it is often desirable to reduce the amount of information required to represent them.

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  • ADC proudly offers a full series of precision Balun products: three XLR to BNC Inline Baluns; plus numerous Multi-Circuit Baluns that can be used in our UniPatch® system or in throwdown applications. For over 50 years ADC has been the leader in audio and video patching products with unsurpassed quality, reliability and innovation. To complement its full line of connectors, ADC has introduced a series of 110 Ω to 75 Ω AES impedance matching Baluns.

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  • With the advent of multimedia, digital signal processing (DSP) of sound has emerged from the shadow of bandwidth-limited speech processing. Today, the main applications of audio DSP are high quality audio coding and the digital generation and manipulation of music signals. They share common research topics including perceptual measurement techniques and analysis/synthesis methods. Smaller but nonetheless very important topics are hearing aids using signal processing technology and hardware architectures for digital signal processing of audio.

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  • EURASIP Journal on Applied Signal Processing 2003:10, 993–1000 c 2003 Hindawi Publishing Corporation Time-Scale Invariant Audio Data Embedding Mohamed F. Mansour Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55414, USA Email: mmansour@ece.umn.edu Ahmed H. Tewfik Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55414, USA Email: tewfik@ece.umn.edu Received 31 May 2002 and in revised form 22 December 2002 We propose a novel algorithm for high-quality data embedding in audio.

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  • IMPULSIVE NOISE 12.1 12.2 12.3 12.4 12.5 12.6 12.7 Impulsive Noise Statistical Models for Impulsive Noise Median Filters Impulsive Noise Removal Using Linear Prediction Models Robust Parameter Estimation Restoration of Archived Gramophone Records Summary I mpulsive noise consists of relatively short duration “on/off” noise pulses, caused by a variety of sources, such as switching noise, adverse channel environments in a communication system, dropouts or surface degradation of audio recordings, clicks from computer keyboards, etc.

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  • Existing AM and FM broadcasting have remained relatively unchanged since the 1960s when FM stereo transmission was introduced. Meanwhile, audio recording techniques have undergone tremendous change from traditional analog to high quality digital recording with the introduction of compact disc, and most recently MP3 compressed audio recording to permit music be transmitted via the Internet. Traditional analog broadcasts were originally designed for stationary receivers and suffer from degradation of the received signal when used in a mobile environment with weak signal strength and multipath...

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