An audio-frequency sweep-generator
department or school: Applied Science, Faculty of
department or school: Electrical Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Bennett, William Frederick
issued: 2012-02-09T17:50:32Z
issued: 1959
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The determination of the amplitude-response characteristic is an important means of checking a network design. However, this measurement is usually a time-consuming procedure and at best does not yield a continuous curve. A device which would produce a continuous curve corresponding to the amplitude-response characteristic would be extremely useful in network design and development. It is shown that the system response to a frequency-modulated signal can be made to approximate the amplitude-response characteristic if the frequency is varied slowly enough so that the "quasi-stationary" conditions exist. The physical realization of this slowly varying frequency requires an oscillator with an extremely large frequency range, controllable by one circuit parameter. The greatest difficulties involved in the design of this oscillator were the development of a simple and stable subtractor and the synthesis of the frequency-determining networks. A mathematical analysis was made to determine the characteristics of the network necessary to produce a logarithmic relation between the oscillator frequency and the control position. The audio-frequency sweep generator was constructed using networks designed to approximate the required characteristics and when tested proved to have a satisfactory output waveform. Any improvement in the oscillator performance would require a better approximation to the specified network characteristics.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/40587
note: AN AUDIO-FREQUENCY SWEEP-GENERATOR by WILLIAM FREDERICK BENNETT B.A.Sc., U n i v e r s i t y o f B r i t i s h C o l u m b i a , 19^2 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE -REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE i n t h e De p a r t m e n t o f o f E l e c t r i c a l E n g i n e e r i n g We a c c e p t t h i s t h e s i s as c o n f o r m i n g t o t h e s t a n d a r d r e q u i r e d f o r c a n d i d a t e s f o r t h e d e g r e e o f MASTER OF APPLIED SCIENCE THE UNIVERSITY OF BRITISH COLUMBIA J a n u a r y , 19f>9 i ABSTRACT The d e t e r m i n a t i o n o f t h e a m p l i t u d e - r e s p o n s e c h a r a c t e r -i s t i c i s an i m p o r t a n t means o f c h e c k i n g a n e t w o r k d e s i g n . How-e v e r , t h i s measurement i s u s u a l l y a t i m e - c o n s u m i n g p r o c e d u r e and at b e s t does n o t y i e l d a c o n t i n u o u s c u r v e . A d e v i c e w h i c h would p r o d u c e a c o n t i n u o u s c u r v e c o r r e s p o n d i n g t o t h e a m p l i t u d e -r e s p o n s e c h a r a c t e r i s t i c w o u l d be e x t r e m e l y u s e f u l i n n e t w o r k d e s i g n and d e v e l o p m e n t . I t i s shown t h a t t h e s y s t e m r e s p o n s e t o a f r e q u e n c y -m o d u l a t e d s i g n a l c a n be made t o a p p r o x i m a t e t h e a m p l i t u d e -r e s p o n s e c h a r a c t e r i s t i c i f t h e f r e q u e n c y i s v a r i e d s l o w l y enough so t h a t t h e " q u a s i - s t a t l o n a r y " c o n d i t i o n s e x i s t . The p h y s i c a l r e a l i z a t i o n o f t h i s s l o w l y v a r y i n g f r e q u e n c y r e q u i r e s an o s c i l l a t o r w i t h an e x t r e m e l y l a r g e f r e q u e n c y r a n g e , c o n t r o l l a b l e b y one c i r c u i t p a r a m e t e r . The g r e a t e s t d i f f i c u l t i e s i n v o l v e d i n t h e d e s i g n o f t h i s o s c i l l a t o r were t h e d e v e l o p m e n t o f a s i m p …
has type: Thesis/Dissertation
is shown at: 10.14288/1.0103232
language: eng
degree discipline: Electrical and Computer Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/40587