JPS645135A - Digital transmission system - Google Patents

Digital transmission system

Info

Publication number
JPS645135A
JPS645135A JP62159612A JP15961287A JPS645135A JP S645135 A JPS645135 A JP S645135A JP 62159612 A JP62159612 A JP 62159612A JP 15961287 A JP15961287 A JP 15961287A JP S645135 A JPS645135 A JP S645135A
Authority
JP
Japan
Prior art keywords
value
axis
degree
signal
conversion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62159612A
Other languages
Japanese (ja)
Other versions
JP2515809B2 (en
Inventor
Tsutomu Noda
Nobutaka Amada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62159612A priority Critical patent/JP2515809B2/en
Publication of JPS645135A publication Critical patent/JPS645135A/en
Application granted granted Critical
Publication of JP2515809B2 publication Critical patent/JP2515809B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To attain the reproduction to a degree that the content of sent information is comprehensible even with the deteriorated transmission C/N by sharing a high-order bit of a code subject to A/D conversion as a multi-value signal of an axis with less degree of multi-value processing and sharing the remaining low-order bits of the code subject to A/D conversion as a multi-value signal for an axis of a degree with much multi-value processing. CONSTITUTION:The degree of multi-value processing of a multi-value signal modulating respectively two-axis (Q, I) carrier orthogonal to each other respectively is made different from the Q axis as two-value and for the I axis as 4-value. Then as the multi-value signal for the Q axis with less degree of multi- value processing, the high-order bit of the code subject to A/D conversion into a required bit number is assigned and as the multi-value signal of the I axis with much degree of multi-value processing, the remaining low-order bits are assigned. Thus, even when the C/N of the transmission signal is deteriorated and most of the low-order bits is in error, the error rate of the high-order bit is less and the voice signal of some degree is to be reproduced.
JP62159612A 1987-06-29 1987-06-29 Digital transmission system Expired - Lifetime JP2515809B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62159612A JP2515809B2 (en) 1987-06-29 1987-06-29 Digital transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62159612A JP2515809B2 (en) 1987-06-29 1987-06-29 Digital transmission system

Publications (2)

Publication Number Publication Date
JPS645135A true JPS645135A (en) 1989-01-10
JP2515809B2 JP2515809B2 (en) 1996-07-10

Family

ID=15697516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62159612A Expired - Lifetime JP2515809B2 (en) 1987-06-29 1987-06-29 Digital transmission system

Country Status (1)

Country Link
JP (1) JP2515809B2 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05276211A (en) * 1992-03-26 1993-10-22 Yuseisho Tsushin Sogo Kenkyusho Hierarchized modulation system for digital signal
JP2000244591A (en) * 1999-02-24 2000-09-08 Nec Corp Circuit and method for demodulation and modulation
US6256357B1 (en) 1992-03-26 2001-07-03 Matsushita Electric Industrial Co., Ltd. Communication system
JP2003060608A (en) * 1998-11-06 2003-02-28 Matsushita Electric Ind Co Ltd Transmitter/receiver
US6549716B1 (en) 1992-03-26 2003-04-15 Matsushita Electric Industrial Co., Ltd. Communication system
USRE38483E1 (en) 1992-03-26 2004-03-30 Matsushita Electric Industrial Co., Ltd. Communication system
US6724976B2 (en) 1992-03-26 2004-04-20 Matsushita Electric Industrial Co., Ltd. Communication system
US6728467B2 (en) 1992-03-26 2004-04-27 Matsushita Electric Industrial Co., Ltd. Communication system
US7072416B1 (en) 1998-11-06 2006-07-04 Matsushita Electric Industrial Co., Ltd. Transmitting/receiving device and transmitting/receiving method
JP2017017501A (en) * 2015-06-30 2017-01-19 日本放送協会 Transmitter, receiver and chip

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05276211A (en) * 1992-03-26 1993-10-22 Yuseisho Tsushin Sogo Kenkyusho Hierarchized modulation system for digital signal
US6256357B1 (en) 1992-03-26 2001-07-03 Matsushita Electric Industrial Co., Ltd. Communication system
US6549716B1 (en) 1992-03-26 2003-04-15 Matsushita Electric Industrial Co., Ltd. Communication system
USRE38483E1 (en) 1992-03-26 2004-03-30 Matsushita Electric Industrial Co., Ltd. Communication system
US6724976B2 (en) 1992-03-26 2004-04-20 Matsushita Electric Industrial Co., Ltd. Communication system
US6728467B2 (en) 1992-03-26 2004-04-27 Matsushita Electric Industrial Co., Ltd. Communication system
JP2003060608A (en) * 1998-11-06 2003-02-28 Matsushita Electric Ind Co Ltd Transmitter/receiver
US7072416B1 (en) 1998-11-06 2006-07-04 Matsushita Electric Industrial Co., Ltd. Transmitting/receiving device and transmitting/receiving method
JP2000244591A (en) * 1999-02-24 2000-09-08 Nec Corp Circuit and method for demodulation and modulation
US7110476B1 (en) 1999-02-24 2006-09-19 Nec Corporation Demodulation and modulation circuit and demodulation and modulation method
JP2017017501A (en) * 2015-06-30 2017-01-19 日本放送協会 Transmitter, receiver and chip

Also Published As

Publication number Publication date
JP2515809B2 (en) 1996-07-10

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