Showing papers on "Voice activity detection published in 1972"

A survey of digital speech processing techniques

Abstract: Digital signal processing techniques are becoming increasingly important in speech analysis and synthesis. These techniques can be implemented using a general purpose computer facility (often not in real time), or special purpose hardware realizations can be constructed. This paper discusses some recent work in speech processing including design of digital filter bank spectrum analyzers, homorphic analyzers of speech, predictive coding, and hardware realization of a digital formant synthesizer. The survey concentrates on those speech processing techniques relevant to the development of sensory aids for the deaf.

Information Input and Performance in Small Decision-Making Groups.

Abstract: The following research hypothesis was investigated in the present study* Increasing the amount and specificity of information should facilitate group decision-making and enhance subsequent measures. College students were employed in a study of group and individual responses to information input varied by type and amount. Statistics, example, and testimony were varied in minimal and augmented amounts of information to produce six experimental conditions assigned to four groups per condition with four subjects per group. Groups rank-ordered a set of four solutions previously generated and ranked by a panel of experts for solution of a problem in labor economics follow­ ing input of one of the six information conditions and a subsequent twenty minute discussion. No significant differ­ ences were obtained among group decisions as a function of information type or amount or an interaction between the two information variables. A second area of analysis concerned measures of time required by each discussion phase. No significant differences were obtained among treatment conditions on measures of the orientation, evaluation, or control phases of discussion or

Voice privacy system

Abstract: A selected bandwidth of speech frequencies is divided into a plurality of sub-bands and each sub-band is processed in a "Weaver modulator" type of circuit for filtering, frequency translation, and inversion. The sub-bands which have undergone frequency translation are then combined to provide a scrambled output which is transmitted to a receiver where the converse processing of the scrambled signals including filtering, frequency translation, and inversion is accomplished to produce the original speech modulated input.

The Two-Fold Way for Speech.

Abstract: MF-$0.65 HC -$3.29 Child Language; *Cognitive Processes; Deep Structure; Experiments; Kernel Sentences; Language Learning Levels; Language Patterns; *Linguistic Competence; *Linguistic Performance; Pictorial Stimuli; Semantics; Sentence Structure; Serial Ordering; *Speech; Surface Structure; Syntax; Tables (Data); *Time On the basis of experimental data, the author makes the following observations: (1) the basic encoding processes in speech, the schemas of orders first produce elementary underlying sentences; (2) underlying sentence structure is the controlling step in the organization of speech; (3) underlying sentence structure plays a central role in regulating the duration of speech; (4) various processes that relate to speech take widely different amounts of time; (5) therefore, there is a definite correspondence between grammatical structure and linguistic performance. Tables containing data concerning temporal duration and a bibliography of references are included. (DD) FILMED FROM BEST AVAILABLE COPY The Two-Fold Way for Speech

On-Line, Real-Time Multiple Speech Output System and Its System Evaluation.

Abstract: A new multiple speech output system is described. This system is based on a compilation method. Fundamental speech elements used for the synthesis are the speech waves within one cycle at larynx frequency. They are stored on a secondary memory. such as a magnetic drum or disk in the form of digitalized zero-crossing intervals. Speech elements are read out from the secondary memory and are connected in succession according to the connection rules by the computer program. The resulting sequences are transformed into the speech sounds by synthesizers. System evaluation is also performed in real time mode to measure the load of the computer and the maximum number of multiplicity.

A Speech Encoder-Multiplexer Feasibility Study.

Abstract: : The report contains a detailed study of various voice differential PCM systems applicable for digitally encoding 3, 4, 5 and 6 voice channels into a 153.6 kilobit per second digital signal which can be used in a switched telecommunication network. Transmission of both speech and data signals over these voice channels is considered. Included in the report are: Calculations of the performance of differential PCM systems with various data signals; An analysis of the performance of differential PCM systems with speech signals; A description of a differential PCM system constructed using standard T1 technology. The research reported here consists of theoretical studies, computer simulation, subjective testing and hardware construction. (Author)