Showing papers on "Speech enhancement published in 1966"
01 May 1966
TL;DR: Techniques for analysis and synthesis of speech signals are reviewed with emphasis on vocoders and related devices for more efficient transmission and storage of speech.
Abstract: Techniques for analysis and synthesis of speech signals are reviewed with emphasis on vocoders and related devices for more efficient transmission and storage of speech. Selected applications of speech coding methods as sensory aids to the handicapped are described.
133 citations
TL;DR: In this paper, it is shown that the variation of the clipped Gaussian noise spectrum is 5 percent, while the normalized cross-correlation function is 0.80; the results are extended to more general cases.
Abstract: The paper is based upon the statistical theory of signals. It is shown that the variation of the clipped Gaussian noise spectrum is 5 percent, while the normalized cross-correlation function is 0.80; the results are extended to more general cases. A property of the conditional mean value of speech signals is derived. A typical value of the normalized intelligibility of clipped speech in the presence of noise is 0.70 for S/N = 3 dB; assuming the ear is a clipper, theoretical results are well in agreement. The existence of an intelligibility threshold is shown. The need for information on the envelope (or dynamics) of the speech wave to meet the requirement of naturalness is underlined.
11 citations
TL;DR: Articulation test results showing a 20 percent improvement in intelligibility are presented, as well as repeaking measurements to show the advantage of this method of processing speech in the type of system considered.
Abstract: The principle of speech clipping at audio and radio frequencies has been fully investigated to determine its advantages in peak-power-limited systems in which the signal is to be transmitted through a noisy channel at radio frequencies. This paper describes the advantages of radio frequency clipping and filtering in systems in which the noise is encountered when transmitting the speech signal at audio frequencies. Articulation test results showing a 20 percent improvement in intelligibility are presented, as well as repeaking measurements to show the advantage of this method of processing speech in the type of system considered.
2 citations
01 Jan 1966
TL;DR: A study of the "average voice" resulting in an electronic synthetic speech signal suitable for testing mobile radio systems in particular and the design outline of a device, which could produce such a signal, is suggested.
Abstract: A report is made on a study, of the "average voice" resulting in an electronic synthetic speech signal suitable for testing mobile radio systems in particular. An analysis of the frequency and level distributions, with respect to time, of a large number of "talkers" precedes a description of the synthetic voice signal. The design outline of a device, which could produce such a signal, is suggested along with comments about its use.