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Implementation of low delay, low bit-rate audio compression for wireless digital audio system (Record no. 58450)

MARC details
000 -LEADER
fixed length control field	03324nas a2200397 a 4500
005 - DATE AND TIME OF LATEST TRANSACTION
control field	20260818134507.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field	090414s2006 th uu\|m rtt 0\| a1eng d
035 ## - SYSTEM CONTROL NUMBER
System control number	.b12052644
099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC)
Classification number	AIT Thesis no.ME-06-07
100 0# - MAIN ENTRY--PERSONAL NAME
Personal name	Jessada Karnjana
245 10 - TITLE STATEMENT
Title	Implementation of low delay, low bit-rate audio compression for wireless digital audio system
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Place of publication, distribution, etc.	Pathum Thani, Thailand :
Name of publisher, distributor, etc.	Asian Institute of Technology,
Date of publication, distribution, etc.	2007
300 ## - PHYSICAL DESCRIPTION
Extent	100 p. :
Other physical details	ill.
490 1# - SERIES STATEMENT
Series statement	Thesis ;
Volume/sequential designation	no. ME-06-07
500 ## - GENERAL NOTE
General note	A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Microelectronics, School of Engineering and Technology
502 ## - DISSERTATION NOTE
Dissertation note	Thesis (M.Eng.) - Asian Institute of Technology, 2006
520 ## - SUMMARY, ETC.
Summary, etc.	The question to increase the compression rate while the reproduction quality to be still acceptable leads to the term of perceptual audio compression. Audio perceptual coding based on a psychoacoustic model which using to eliminate the irrelevant information. Psychoacoustic model is a mathematical model of human perceptual of sound. The goal of model is to develop functions that are related to hearing sensations of human auditory system. For real-time applications, e.g. wireless speaker, headphones, or internet telephony, these applications do not require high audio quality but require low coding delay. To achieve this fashion, I designed a system with low complexity to reduce the computational times but the quality does not much different from audio CD. I used MDCT filter banks as subband coding. The advantage of MDCT is its perfected reconstruction. For quantizing. I compare the coding performance both full-range and narrow-range. A full-range quantization gave poor dequantized signals compare to narrow-range quantization. But full-range is acceptable for a low bit-rate requirement. Adding Huffman coding after quantization improves compression ratio less than 5%. It depends on the nature of data to compress. Huffman coding is useless in the case of less identical data. Thus I designed the system to check the identical data before perform Huffman coding. This codec gave the average compression ratio about 2.71: I or 62.5%. The number of bits per sample reduced to 5.99 bits per sample b'om 16 hits per sample
650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element	Psychoacoustics
650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element	Auditory perception
700 1# - ADDED ENTRY--PERSONAL NAME
Personal name	Afzulpurkar, Nitin V.,
Relator term	Chairperson
700 0# - ADDED ENTRY--PERSONAL NAME
Personal name	Pasin Israsena,
Relator term	Co-chairperson
700 0# - ADDED ENTRY--PERSONAL NAME
Personal name	Chumnarn Punyasai,
Relator term	Examination committee
710 2# - ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element	Thailand Graduate Institute of Science and Technology,
Relator term	Scholarship donor
810 2# - SERIES ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element	Asian Institute of Technology.
Title of a work	Thesis ;
Volume/sequential designation	no. ME-06-07
856 ## - ELECTRONIC LOCATION AND ACCESS
Materials specified	Full-Text
Uniform Resource Identifier	<a href="http://203.159.5.9/ait-thesis/detail.php?q=B11063">http://203.159.5.9/ait-thesis/detail.php?q=B11063</a>
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998 ## - LOCAL CONTROL INFORMATION (RLIN)
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Cataloger's initials, CIN (RLIN)	090414
First date, FD (RLIN)	m
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945 ## - LOCAL PROCESSING INFORMATION (OCLC)
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945 ## - LOCAL PROCESSING INFORMATION (OCLC)
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942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type	22-AIT Thesis (Replacement)
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type	40-Archives
909 ## - LOCAL ITEMS USED
Barcode	Barcode : 30050120657803
CREATED	CREATED : 2014-03-21
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Barcode	Barcode : 30050160027834
CREATED	CREATED : 2016-03-17
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Holdings
Withdrawn status	Lost status	Damaged status	Not for loan	Home library	Current library	Shelving location	Date acquired	Cost, normal purchase price	Total checkouts	Full call number	Barcode	Date last seen	Copy number	Price effective from	Koha item type
			Available for Loans	Asian Institute of Technology Library	Asian Institute of Technology Library	AIT Publications	18/08/2026	50.00		AIT Thesis no.ME-06-07	30050120657803	18/08/2026	3	18/08/2026	22-AIT Thesis (Replacement)
			Available for Loans	Asian Institute of Technology Library	Asian Institute of Technology Library	Archives	18/08/2026			AIT Thesis no.ME-06-07	30050160027834	18/08/2026	1	18/08/2026	40-Archives

Implementation of low delay, low bit-rate audio compression for wireless digital audio system (Record no. 58450)

AIT

Asian Institute of Technology Library