JPS645135A - Digital transmission system - Google Patents
Digital transmission systemInfo
- 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
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.
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)
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 |
-
1987
- 1987-06-29 JP JP62159612A patent/JP2515809B2/en not_active Expired - Lifetime
Cited By (11)
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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