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IEE Colloquium on Digital Audio Signal Processing

22 May 1991

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  • A methodological critique of local room equalization techniques

    Publication Year: 1991, Page(s):6/1 - 6/4
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    A local room equalization scheme for an audio system is desired where the equalization is valid over an area large enough to allow for head movements and ideally for other listeners situated nearby. The authors aim to provide some introductory insight into the size of this area, termed region of equalization (ROE), which depends on many factors-room geometry, boundary treatments, speaker/listener ... View full abstract»

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  • Digital signal processing: technology and marketing for audio systems

    Publication Year: 1991, Page(s):5/1 - 5/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    Compact disc (CD) and digital audio tape (DAT) formats are now widely accepted as being a very reliable and high quality means of reproducing music. With these new systems has come considerable new terminology and technology. A visit to any high street store will confirm that the marketing and advertising strategies for these systems discusses the attributes of digital filters, 4X's oversampling, ... View full abstract»

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  • High quality digital audio

    Publication Year: 1991, Page(s):111 - 112
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    Suggests that in digital-audio systems aspiring to the description `high-quality', an area of major importance is its accuracy in handling low-level signals. To some extent this focus reflects the author's direct experience designing and using digital audio components. The mechanisms of low-level distortions, both static and dynamic have been examined, as has the behaviour of some converter and DS... View full abstract»

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  • Sample rate conversion and bit rate reduction in the studio

    Publication Year: 1991, Page(s):8/1 - 8/3
    Cited by:  Patents (45)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    The standardisation of audio interfaces has enabled a proliferation of digital audio equipment to be used and interconnected to the great benefit of broadcasters and the services they provide. However, it has also introduced additional requirements for sample rate conversion (integer ratio conversion and variable rate conversion) and bit rate reduction processes at many interfaces in the signal ro... View full abstract»

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  • Design limitations for digital audio power amplification

    Publication Year: 1991, Page(s):4/1 - 4/4
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The factors which limit linearity and resolution in digital to analogue conversion (DAC) based on pulse width modulation (PWM) and oversampled noise shaping (ONS) are compared using signal to noise ratio (SNR) and total harmonic distortion (THD) figures. Solutions to each of these factors are suggested, with an indication of the level of effectiveness that can be expected in a practical PWM/ONS di... View full abstract»

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  • IEE Colloquium on `Digital Audio Signal Processing' (Digest No.107)

    Publication Year: 1991
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (20 KB)

    The following topics were dealt with: high quality digital audio; D/A conversion; power amplifiers; DSP technology and marketing; local room equalisation techniques; digital audio in TV studios; and multiprocessor architectures for audio DSP View full abstract»

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  • On the re-allocation of processing resources for digital audio signal processing

    Publication Year: 1991, Page(s):7/1 - 7/4
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    When implemented digitally, large-scale audio processing systems require the realisation of highly parallel architectures. Task scheduling strategies are necessary to distribute the processing algorithms required-termed the taskforce-across such architectures. The results obtained show that good-quality solutions can be expected from simple heuristic methods with minimum scheduling overhead. More ... View full abstract»

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  • Design and performance of a noise shaping, pulse width modulated, digital to analogue converter

    Publication Year: 1991, Page(s):2/1 - 2/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    Describes the implementation of an audio DAC which is based on oversampled, noise shaped pulse width modulation. The basic principles of oversampled noise shaping (ONS) and pulse width modulation (PWM) are outlined, with particular reference to how ONS is used to relax the design specifications of the PWM circuit. The DAC has been tested by measuring its response to digitally generated tones from ... View full abstract»

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  • A scalable hybrid multiprocessor for real-time digital audio signal processing

    Publication Year: 1991, Page(s):9/1 - 9/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The real-time performance requirements of large scale digital audio processing systems demand the use of a computation engine rated in thousands of MIPs. Currently available processors are not capable of operating at these speeds, and so multiprocessor architectures must be constructed in order to implement such systems. The choice of processor, communication scheme and interconnection topology ar... View full abstract»

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  • Improved sampling process for a digital, pulse-width modulated, class D power amplifier

    Publication Year: 1991, Page(s):3/1 - 3/5
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    A pulse-width modulation sampling process has been derived which is suitable for implementation in an entirely digital system, but has a performance comparable with that of natural sampling. The new process introduces negligible distortion to audio bandwidth signals at pulse carrier frequencies of 176 kHz or above. As a result it should be possible to realise a high efficiency, high performance cl... View full abstract»

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