Showing papers on "Audio signal processing published in 1968"
Patent•
14 Mar 1968
TL;DR: In this paper, a sound viewer is described, including means for receiving an audio signal and converting it into an electrical signal, at least one amplifier for adjusting the intensity level of the electrical signal; a plurality of filters, each having a band-pass corresponding to the major frequency components of the audio signal produced by a particular device (viz a car engine, train whistle, horn or emergency vehicle siren); indicator means, such as lamps, connected to the output of the filters.
Abstract: A sound viewer apparatus is described, including means for receiving an audio signal and converting it into an electrical signal, at least one amplifier for adjusting the intensity level of the electrical signal; a plurality of filters, each having a band-pass corresponding to the major frequency components of the audio signal produced by a particular device (viz a car engine, train whistle, horn or emergency vehicle siren); indicator means, such as lamps, connected to the output of the filters; and automatic gain control means responsive to the output of each filter for adjusting the electrical signal input to the amplifier for maintaining the input to the indicators at a level whereby the indicator means (lamps) can clearly show, by relative brightness, which type of device produced the audio sound and its relative intensity.
24 citations
Patent•
IBM1
TL;DR: In this article, the authors proposed a method for converting binary coded digital signals into analog signals, in which the initial digital signal is at first converted into a pulse whose duration is representative of said digital signal, then integrated.
Abstract: Apparatus for converting binary coded digital signals into analog signals, in which the initial digital signal is at first converted into a pulse whose duration is representative of said digital signal, then integrated. Also disclosed are some improvements allowing harmonics to be reduced, more particularly by combining a first pulse whose duration is representative of the binary value of the digital signal with a second pulse whose duration is representative of the binary complement of the value of said digital signal.
12 citations
01 Jan 1968
TL;DR: The final author version and the galley proof are versions of the publication after peer review that features the final layout of the paper including the volume, issue and page numbers.
Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.