The effect of interference on delta modulation encoded video signals

An adaptive delta modulator which encodes composite color video signals was shown to provide a good response when operating at 16 Mb/s and near-commercial quality at 23Mb/s. The ADM was relatively immune to channel errors. The system design is discussed and circuit diagrams are included

Communication system analysis for manned space flight

One- and two-dimensional adaptive delta modulator (ADM) algorithms are discussed and compared. Results are shown for bit rates of two bits/pixel, one bit/pixel and 0.5 bits/pixel. Pictures showing the difference between the encoded-decoded pictures and the original pictures are presented. The effect of channel errors on the reconstructed picture is illustrated. A two-dimensional ADM using interframe encoding is also presented. This system operates at the rate of two bits/pixel and produces excellent quality pictures when there is little motion. The effect of large amounts of motion on the reconstructed picture is described

Optimal space communications techniques Status report, 16 Dec. 1969 - 15 Mar. 1970

All digital phase locked loop FM demodulator, and optimum adaptive delta modulator designed for improving space communicatio

Optimum frequency modulation receivers

Optimization of receivers for demodulating FM SIGNAL corrupted by Gaussian noise, and solution to maximum likelihood equatio

Computer simulator for a mobile telephone system

A software simulator was developed to help in the design of the LMSS. The simulator is used to study the characteristics and implementation requirements of the LMSS' configuration

Computer simulator for a mobile telephone system

A software simulator to help NASA in the design of the LMSS was developed. The simulator will be used to study the characteristics of implementation requirements of the LMSS's configuration with specifications as outlined by NASA

Competence-Oriented Teaching: Combining Theory and Practice in a Future-Oriented Teacher Education

Linking theory and practice in university teacher education is a necessary condition for the development of didactic competence. With this in mind, we developed a seminar to promote competence-oriented teaching through a continuous exchange of practical expertise with current teachers. As a result, all of the participants (students and teachers) should acquire greater pedagogical knowledge as a central element of their teaching expertise. In order to examine the impact of the seminar, we measured the development of the competence-oriented didactic knowledge of 57 participating students and 6 accompanying teachers. To do so, we used a pre–post design with different control groups. The results show a significant increase in didactic knowledge. But they also show that diagnostic competences need significant further development. Hence, in the future, the seminar will be supplemented by video-based learning elements, which in particular address the difficulty of teaching competences in classrooms with a wide variety of pupils

Threshhold analysis of phase locked loops

Computer technique for predicting threshold in phased locked loops with and without frequency modulatio

A space communication study Progress report, 15 Sep. 1966 - 15 Mar. 1967

Space communications studies of optimal signal reception, threshold extension, signal detection against noise, channel simulation, and synchronization technique