JPS6157136A - Pcm signal transmission system for catv - Google Patents

Pcm signal transmission system for catv

Info

Publication number
JPS6157136A
JPS6157136A JP17968884A JP17968884A JPS6157136A JP S6157136 A JPS6157136 A JP S6157136A JP 17968884 A JP17968884 A JP 17968884A JP 17968884 A JP17968884 A JP 17968884A JP S6157136 A JPS6157136 A JP S6157136A
Authority
JP
Japan
Prior art keywords
signal
circuit
outputs
frequency
division multiplexed
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
JP17968884A
Other languages
Japanese (ja)
Other versions
JPH0439813B2 (en
Inventor
Keiji Ito
啓二 伊藤
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP17968884A priority Critical patent/JPS6157136A/en
Publication of JPS6157136A publication Critical patent/JPS6157136A/en
Publication of JPH0439813B2 publication Critical patent/JPH0439813B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J4/00Combined time-division and frequency-division multiplex systems
    • H04J4/005Transmultiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To attain high quality and multi-channel transmission of a PCM music signal using a CATV line by transmitting plural signals subject to time division multiplex from plural analog signals while they are subject to frequency division multiplex. CONSTITUTION:for example, 20-channel CH analog signals lil-li4 (i=1-5) are inputted to multiplex sections 1-1-1-5 by 4-CH each. The input signal is subject to A/D conversion, coding, time division multiplex, a 4-phase DPSK modulation and amplitude modulation at each multiplex section and an amplitude modulation signal 3il subject to frequency conversion corresponding to different local oscillation frequency is inputted to a coupling circuit 41. The circuit 41 couples the signal 3il and outputs it to a television signal and of a CATV line as a frequency division multiplex signal 411. The signal 411 is fed to a distribution circuit 51, where the signal is distributed, fed to multiplex separation sections 2-1-2-5 as an output signal 6il. The input analog signal is subject to amplitude modulation, 4-phase DPSK demodulation, multiplex separation, decoding and D/A conversion at each multiplex separation section and the signal is outputted as analog signals 8il 8i4.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はCATV用PCM信号伝送方式に関し、特にC
ATV回at用いてPCM音楽信号を伝送する場合等に
用いるのに好適なCATV用PCM信号伝送方式に関す
る。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a PCM signal transmission system for CATV, and particularly to a PCM signal transmission system for CATV.
The present invention relates to a PCM signal transmission system for CATV that is suitable for use when transmitting PCM music signals using ATV circuits.

〔従来の技術〕 昨今のディジタル技術とIC化技術の進歩は目覚しく、
これらの技術に裏付けられた複雑なディジタル処理機能
金有する装置が安価に一般家庭にも導入される傾向が強
まっている。そのために、テレビ衛星放送に付随する音
声の伝送についても、高品質化・多チャンネル化を図っ
たディジタル伝送方式の検討が急速に進展してきている
(例えばテレビジ冒ン学会誌37[”1l)(1983
)P935〜P94L  テレビジlン術星放送ディジ
タル音声伝送方式)。このテレビジ冒ン衛星放送ディジ
タル音声伝送方式では、4チヤンネルのディジタル音声
信号を時分割多重化し、副搬送波を4相差動位相(以下
4相DP SKと言う)変調して4相DPSK変調信号
を得るように構成されている。この4相I)PSK変調
信号は、副搬送波を選定することによって映像信号の上
側に周波数分割多重化される。この多重化信号によって
主搬送波を周波数変調(以下、FM変調と云う)する。
[Conventional technology] Recent advances in digital technology and IC technology are remarkable.
There is a growing tendency for devices with complex digital processing functions supported by these technologies to be introduced into ordinary households at low cost. For this reason, studies are rapidly progressing on digital transmission methods that aim to improve quality and increase the number of channels for the transmission of audio accompanying television satellite broadcasting (for example, Journal of the Television Broadcasting Society 37 ["1l]"). 1983
)P935-P94L Televising Star Broadcasting Digital Audio Transmission System). In this television satellite broadcasting digital audio transmission system, four-channel digital audio signals are time-division multiplexed, and subcarriers are modulated using four-phase differential phase (hereinafter referred to as four-phase DPSK) to obtain a four-phase DPSK modulated signal. It is configured as follows. This four-phase I)PSK modulated signal is frequency division multiplexed onto the video signal by selecting subcarriers. The main carrier wave is frequency modulated (hereinafter referred to as FM modulation) using this multiplexed signal.

このFM変調信号はl 、2 GHz帯衛星放送回線を
使用して27M Hz の周波数帯域幅で伝送される。
This FM modulated signal is transmitted with a frequency bandwidth of 27 MHz using a 2 GHz band satellite broadcasting line.

ところでこのようなディジタル信号はピットレートが高
く、すなわち周波数帯域幅が広く、従って広帯域周波数
を使用できる衛星放送等では伝送可能であるが、使用で
きる周波数帯域幅が6MHzと狭いCATV回線では、
ディジタル信号の伝送シ困難であるとされている。
By the way, such digital signals have a high pit rate, that is, a wide frequency bandwidth, and therefore can be transmitted by satellite broadcasting, etc., which can use wideband frequencies, but with CATV lines, where the usable frequency bandwidth is as narrow as 6MHz,
Transmission of digital signals is said to be difficult.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明が解決しようとする問題点は5MHzの周波帯域
幅のCATV回線を用いて例えば20チャンネル以上の
多数チャンネルの高品質のPCM音楽信号等を伝送する
ことを可能にすることInす、本発明の目的は上記の問
題点を解決したCATV用PCM信号伝送方式を提供す
φことにある。
The problem to be solved by the present invention is to make it possible to transmit high-quality PCM music signals of multiple channels, for example, 20 channels or more, using a CATV line with a frequency bandwidth of 5 MHz. The purpose of this invention is to provide a PCM signal transmission system for CATV that solves the above problems.

〔問題点を解決するための手段〕[Means for solving problems]

本発明のCATV用PCM信号伝送方式は第一のアナロ
グ信号を入力して第一のディジタル信夛≦変換して出力
する複数個のアナログ・ディジタル変換器と、前記アナ
ログ・ディジタル変換器に対応して設けられ前記第一の
ディジタル信号を入力して第一のPCM信号に符号化し
て出力する複数個の符号化回路と、前記第一のPCM信
号を入力。
The PCM signal transmission system for CATV of the present invention includes a plurality of analog-to-digital converters that input a first analog signal, convert it into a first digital signal, and output the converted signal, and the analog-to-digital converter. a plurality of encoding circuits that are provided to input the first digital signal, encode it into a first PCM signal, and output the encoded signal; and input the first PCM signal.

して時分割多重化した第一の時分割多重化信号を出力す
る多重化回路と、前記第一の時分割多重化信号を入力し
て第一の位相変調信号に変調して出力する位相変調回路
と、前記第一の位相変調信号を入力して不要酸、分を除
去した第二の位相変調信号を出力する第一の帯域F波器
と、局部発振周波数を発生する第一の局部発振回路と、
前記第二の位相変調信号を入力し前記局部発振周波数に
よ、って周緯数変換した第一の振幅変調信号を出力する
振幅変調回路と、前記第一の振幅変調信号を入力して不
要成分を除去した第二の振幅変調信号を出力する第二の
帯域F波器とを有する複数個の多重化部と、前記複整個
の多重化部の出力信号を入力して周波数分割多重化した
周波数分割多重化信号をCATV回線に出力する結合回
路とを備える送信装置および、前記周波数分割多重化信
号を入力して複数個の多重化分離部に分配して出力する
分配回路と、前記分配回路の出力信号のうちのいずれ−
か1個の出力信号を入力して所定の周波数帯域信号を選
択し第三の振幅変調信号全出力する第三の帯域F波器と
、局部発振周波数を発生する第二の局部発振回路と、前
記第三の振幅変調信号を入力して前記第二の局部発振回
路が発生する前記局部発振周波数によって周波数逆変換
した振幅復調信号を出力する振幅復調回路と、前記振幅
復調信号を入力して不要成分を除去した第三の位相変調
信号分出力する第四の帯域テ波器と、前記第三の位相変
調信号を入力して第二の時分割多重化信号に復調して出
力する位相復調回路と、前記第二の時分割多重化信号?
入力して複数の第二〇PCM信号に分離して複数個の復
号化回路に出力する多重化分離回路と、前記第二〇PC
M信号を入力して第二のディジタル信号に復号化して出
力する前記複数個の復号化回路と、前記復号化回路に対
応して設けられ前記第二のディジタル信号を入力して第
二のアナログ信号に変換して出力する複数個のディジタ
ル・アナログ変換器とを有する前記複数個の多重化分離
部とを備える受信装置とを具備して構成される。
a multiplexing circuit that outputs a first time-division multiplexed signal that is time-division multiplexed; and a phase modulation circuit that inputs the first time-division multiplexed signal, modulates it into a first phase modulation signal, and outputs the modulated signal. a first band F-wave generator that inputs the first phase modulation signal and outputs a second phase modulation signal from which unnecessary acids and components are removed; and a first local oscillation circuit that generates a local oscillation frequency. circuit and
an amplitude modulation circuit that inputs the second phase modulation signal and outputs a first amplitude modulation signal frequency-converted according to the local oscillation frequency; A plurality of multiplexing units each having a second band F wave generator that outputs a second amplitude modulated signal from which the component has been removed, and the output signals of the plurality of multiplexing units are inputted and frequency division multiplexed. a transmitting device comprising a coupling circuit that outputs a frequency division multiplexed signal to a CATV line; a distribution circuit that receives the frequency division multiplexed signal and distributes it to a plurality of demultiplexing sections for output; and the distribution circuit. Which of the output signals of -
a third band F wave generator which inputs one output signal, selects a predetermined frequency band signal, and outputs a third amplitude modulated signal in its entirety, and a second local oscillation circuit which generates a local oscillation frequency; an amplitude demodulation circuit that inputs the third amplitude modulation signal and outputs an amplitude demodulation signal whose frequency is inversely converted by the local oscillation frequency generated by the second local oscillation circuit; a fourth band modulator that outputs a third phase modulated signal from which components have been removed; and a phase demodulator that receives the third phase modulated signal, demodulates it into a second time division multiplexed signal, and outputs the demodulated signal. And said second time division multiplexed signal?
a multiplexing and demultiplexing circuit that inputs the input, separates it into a plurality of 20th PCM signals, and outputs the same to a plurality of decoding circuits; and the 20th PCM signal.
a plurality of decoding circuits that input the M signal, decode it into a second digital signal, and output it; and a plurality of decoding circuits that input the second digital signal and output the second analog and a receiving device including the plurality of multiplexing and demultiplexing sections having a plurality of digital-to-analog converters that convert the signal into a signal and output the signal.

〔実施例〕〔Example〕

次に、本発明について一実施例を示す図を参照して詳細
に説明する。
Next, the present invention will be described in detail with reference to figures showing one embodiment.

第り図(al 、 fbl 、 (C1および(diは
本発明の一実施例を示すブロック図で、第り図(a)は
送信装置の構成を示し、第り図(b)は受信装置の構成
を示す。第り図(C1は送信装置の多重化部の詳細な構
成を示し、第り図(dlは受信装置の多重化分離部の詳
細な構成を示す。
Figures (al, fbl, (C1 and (di) are block diagrams showing one embodiment of the present invention. Figure (a) shows the configuration of the transmitting device, and Figure (b) shows the configuration of the receiving device. The configuration is shown in Figure 1 (C1 shows the detailed configuration of the multiplexing unit of the transmitting device, and Figure dl shows the detailed configuration of the multiplexing and demultiplexing unit of the receiving device.

まず第り図fatおよび(C1を参照して送信装置につ
いて説明する。
First, the transmitting device will be explained with reference to the diagrams fat and (C1).

20チヤンネルのアナログ信号111−154の中で、
例えば4チヤンネルのアナログ信号111〜114 は
、多重化部1−1の4個のアナログ・ディジタル変換器
(A/D変換器)11−14にそれぞれ供給される。A
/D変換器tt−14はアナログ信号111〜114を
ディジタル信号201〜204に変換する。このディジ
タル信号201〜204は符号化回路2L〜24に供給
される。符号化回路21〜24はディジタル信号201
〜204を符号化してPCM信号211〜214とし、
PCM信号211〜214は多重化回路31に供給され
る。多重化回路31は供給され7’2−PCM信号21
1〜214を時分割多重化して、高品質化のための誤9
訂正符号を付加するとともに同期信号・制御信号等の付
加信号を付加し、さらにバースト誤1ランダム化するた
めにインターリーブし、後述する受信装置での同期信号
抽出を安定化するためにスクランブルし、ピットレー1
’2.048Kb/Sの時分割多重化信号3【2とする
。この時分割多重化信号312は4相DPSK変調回路
32に供給される。4相D P S K変調回路32は
時分割多重化信号312によってそれ自身の搬送波を4
相DPSK変調してボーレート1.024 Kb/Sの
信号とし、この信号の5チヤ/ネルk 6 MHzの周
波数帯域幅に周波数分包〇多重化するため、信号品質を
落さずに周波数帯域幅を狭めるように20%のロールオ
フ整形した4相DPSK変調信号313とする。この4
相DP SK変調信号313は帯域ヂ波器33に供給さ
れる。帯域F波器33は4相DPSK変調信号313の
不要成分を除去し、その出力信号314は振幅変調回路
34に供給される。
Among the 20 channels of analog signals 111-154,
For example, four channels of analog signals 111-114 are respectively supplied to four analog-to-digital converters (A/D converters) 11-14 of the multiplexer 1-1. A
/D converter tt-14 converts analog signals 111-114 into digital signals 201-204. These digital signals 201-204 are supplied to encoding circuits 2L-24. Encoding circuits 21 to 24 are digital signals 201
~204 are encoded as PCM signals 211~214,
PCM signals 211-214 are supplied to multiplexing circuit 31. The multiplexing circuit 31 is supplied with the 7'2-PCM signal 21
1 to 214 are time-division multiplexed to improve quality.
In addition to adding a correction code, additional signals such as synchronization signals and control signals are added, interleaving is performed to randomize burst errors, scrambling is performed to stabilize synchronization signal extraction in the receiving device, which will be described later, and pit trace processing is performed. 1
'2.048 Kb/S time division multiplexed signal 3 [2. This time division multiplexed signal 312 is supplied to a four-phase DPSK modulation circuit 32. The 4-phase DPSK modulation circuit 32 modulates its own carrier wave by the time division multiplexed signal 312.
A signal with a baud rate of 1.024 Kb/S is obtained by phase DPSK modulation, and the 5 channels/channels of this signal are frequency-wrapped and multiplexed into a frequency bandwidth of 6 MHz. A 4-phase DPSK modulated signal 313 is processed with a 20% roll-off to narrow the width. This 4
The phase DP SK modulated signal 313 is supplied to the band waver 33. The band F wave generator 33 removes unnecessary components from the four-phase DPSK modulated signal 313, and its output signal 314 is supplied to the amplitude modulation circuit 34.

振幅変調回路34はこの出力信号314によって、局部
発信回路35から発生する局部発振周波数316’に振
幅変調し、振幅変調信号315 として出力する。振幅
変調信号315は帯域P波器36に供給される。帯域ろ
波器36は振幅変調信号315の中の不要成分を除去し
、局部発振周波数316によって周波数変換された振幅
変調信号311として出力する。これが多重化部1−1
の出力信号311である。
The amplitude modulation circuit 34 performs amplitude modulation on the output signal 314 to a local oscillation frequency 316' generated from the local oscillation circuit 35, and outputs it as an amplitude modulation signal 315. Amplitude modulated signal 315 is supplied to band P wave generator 36 . Bandpass filter 36 removes unnecessary components from amplitude modulation signal 315 and outputs it as amplitude modulation signal 311 frequency-converted by local oscillation frequency 316 . This is multiplexing section 1-1
This is the output signal 311 of .

他の4個の多重化部L−2〜l−5の各4チヤンネルの
入力信号すなわち4X4=16チヤンネル(20−4=
16チヤネル)のアナログ信号121〜L24.・・・
、151〜154 についても、上述と同様である。多
重化部L−2〜L−5はアナログ信号121−124.
・・・、151−154を入力しA/D変換・符号化・
時分割多重化、4相DPSK変調および振偏変調し、そ
れぞれの局部発振回路が発生する異りた局部発振周波数
に対応して周波数変換された振幅変調信号321〜35
1として出力する。これら周波数変換された振幅変調信
号311〜351は、互に相異なる局部発振周波数を設
定することによって相互に符号間の干渉がないように周
波数が配置されてお夛、結合回路41に供給される。結
合回路41は振幅変調信号311〜351を結合して周
波数分割多重化信号411  としてCATV回線のテ
レビ信号帯域に出力する。
The input signals of each of the four channels of the other four multiplexers L-2 to L-5 are 4×4=16 channels (20-4=
16 channels) analog signals 121 to L24. ...
, 151 to 154 are also the same as above. The multiplexing units L-2 to L-5 output analog signals 121-124.
..., input 151-154 and perform A/D conversion/encoding/
Amplitude modulated signals 321 to 35 are subjected to time division multiplexing, four-phase DPSK modulation and polarization modulation, and frequency converted in accordance with different local oscillation frequencies generated by each local oscillation circuit.
Output as 1. These frequency-converted amplitude modulation signals 311 to 351 are arranged in frequency so that there is no interference between symbols by setting different local oscillation frequencies, and then supplied to the coupling circuit 41. . The combining circuit 41 combines the amplitude modulated signals 311 to 351 and outputs it as a frequency division multiplexed signal 411 to the television signal band of the CATV line.

第2図は、 CATV回線のテレビ信号帯域(周波数帯
域幅としては5 MHz ) における本実施例の周波
数分割多重化信号4110周波数スペクトル図である。
FIG. 2 is a frequency spectrum diagram of the frequency division multiplexed signal 4110 of this embodiment in the TV signal band of the CATV line (frequency bandwidth is 5 MHz).

ロールオフ率20%の整形にニジ各4相DPSK変調信
号の周波数帯域幅は1.024X1.2中1.2 MH
zとなシ、各多重化部t−t〜t−sに1      
 おけるそれぞれの局部発振周波数11〜f5は周波数
間隔が1.2 MHz IIC!るように配置されてい
る。
The frequency bandwidth of each 4-phase DPSK modulated signal is 1.2 MH in 1.024 x 1.2 with a roll-off rate of 20%.
z and Nashi, 1 for each multiplexing section t-t to t-s
The frequency interval of each local oscillation frequency 11 to f5 in IIC! is 1.2 MHz. It is arranged so that

次に、第1図(b)および(d) t−参照して受信装
置について説明する。
Next, the receiving apparatus will be explained with reference to FIGS. 1(b) and 1(d).

CATV回恕を介して伝送さ九てくる周波数分割多重化
信号411は、分配回路5Lに供給される。
The frequency division multiplexed signal 411 transmitted via the CATV signal is supplied to the distribution circuit 5L.

分配回路5Lは周波数多重化信号411を分配出力し、
出力信号611〜651としてそれぞれ多重化分離部2
−L〜2−5に供給する。この出力信号611〜651
の各々は、それぞれ多重化分離部2−L〜2−5の帯域
デ波器に供給される。例えは出力信号611は多重化分
離部2−1の帯域戸波器6Lに供給される。帯域戸波器
6Lは出力信号6110所定の周波数帯域の信号を選択
して出力する。この選択して送出される出力信号616
は送信装置において周波数変換された振幅変調信号31
1 と同一の信号であシ、振幅復調回路62に供給され
る。振幅復調回路62は局部発振回路63において発生
さ゛れで送出される局部発振周波数614によシ出力信
号6L6t−周波数逆変換して振幅復調信号615とし
て出力する。振幅復調     1信号615は帯域p
波器64に供給される。帯域F波器64は振幅復調信号
615の中の不要成分を除去し、出力信号612として
出力する。この出力信号612は送信装置においで不要
成分を除去さnた4相DPSK変調信号314と同一の
信号であ)、4相DP8に復調回路65に供給される。
The distribution circuit 5L distributes and outputs the frequency multiplexed signal 411,
As the output signals 611 to 651, the multiplexing and demultiplexing unit 2
-L to 2-5. This output signal 611-651
are respectively supplied to the band demultiplexers of demultiplexing units 2-L to 2-5. For example, the output signal 611 is supplied to the bandpass filter 6L of the multiplexer/demultiplexer 2-1. The bandpass filter 6L selects and outputs an output signal 6110, a signal in a predetermined frequency band. This selected output signal 616 is sent out.
is the amplitude modulated signal 31 frequency-converted in the transmitting device.
1 and is supplied to the amplitude demodulation circuit 62. The amplitude demodulation circuit 62 inversely converts the frequency of the output signal 6L6t using the local oscillation frequency 614 generated and sent out by the local oscillation circuit 63, and outputs it as an amplitude demodulation signal 615. Amplitude demodulation 1 signal 615 is in band p
The signal is supplied to a wave generator 64. Band F wave generator 64 removes unnecessary components from amplitude demodulated signal 615 and outputs it as output signal 612. This output signal 612 is the same signal as the 4-phase DPSK modulated signal 314 from which unnecessary components have been removed in the transmitter), and is supplied to the demodulation circuit 65 as a 4-phase DP8.

4相DPSK復調回路65は帯域F波器64の出力信号
6L2t−4相DPSK復調して時分割多重化信号61
3として出力する。この時分割多重化信号613は多重
化分離回路66に供給される。多重化分離回路66は時
分割多重化信号613の誤シ訂正を行い、同期信号の抽
出をし、ディスクランプルレ、インターリーズを元に戻
し、4つのPCM信号711〜7【4に分離して出力す
る。このPCM信号7【【〜714は4個の復号化回路
7【〜74に供給される。復号化回路71〜74はPC
M信号711〜7L4t−復号化してディジタル信号S
tt〜514 として出力する。ディジタル信号5LL
〜514はディジタル・アナログ変換器(D/A変換器
)81〜84に供給される。D/A変換器81〜84は
ディジタル信号511〜5」4t−アナログ信号gtt
〜8L4に変換して出力する。
The 4-phase DPSK demodulation circuit 65 demodulates the output signal 6L2t of the band F-wave unit 64 to 4-phase DPSK and generates the time division multiplexed signal 61.
Output as 3. This time division multiplexed signal 613 is supplied to a multiplexing/demultiplexing circuit 66. The multiplexing and demultiplexing circuit 66 corrects errors in the time division multiplexed signal 613, extracts the synchronization signal, restores the discrepancy and interlease, and separates the signal into four PCM signals 711 to 7 [4]. Output. This PCM signal 7[~714 is supplied to four decoding circuits 7~74. The decoding circuits 71 to 74 are PCs.
M signals 711 to 7L4t-decoded to digital signal S
Output as tt~514. Digital signal 5LL
~514 are supplied to digital/analog converters (D/A converters) 81~84. D/A converters 81 to 84 are digital signals 511 to 5''4t-analog signals gtt
~8L4 and output.

他の分配回路出力信号621〜651についても上述と
同様に多重化分離部2−2〜2−5に供給される。多重
化分離部2−2〜2−5は分配回路出力信号621〜6
51を振幅復調し、4相DPSK復調し、多重化分離し
、復号化し、さらにD/A変換し、アナログ信号821
〜824.・・・、851〜854 として多チャ/ネ
ル・高品質信号を出力する。
The other distribution circuit output signals 621 to 651 are also supplied to the multiplexing and demultiplexing sections 2-2 to 2-5 in the same manner as described above. The multiplexing and demultiplexing units 2-2 to 2-5 receive distribution circuit output signals 621 to 6.
51 is amplitude demodulated, 4-phase DPSK demodulated, multiplexed, demultiplexed, decoded, and further D/A converted to produce an analog signal 821.
~824. . . , 851 to 854 to output multi-channel/high quality signals.

なお、上述の実施例では、各多重化部【入力され、各多
重化分離部から出力されるアナログ信号は4チヤンネル
であるが、この数に限定されることはない。まfc1多
重化部および多重化分離部はそれぞれ5個としているが
この数に限定されることもない。さらに4相DrSK変
復調は4相に限定されることはなく1例えば8相DPS
K変復調あるいはL6値直交振幅変復調(QAM)でも
よい。
In the above-described embodiment, the analog signals inputted to each multiplexer and outputted from each multiplexer/demultiplexer are four channels, but the number is not limited to this number. Although there are five fc1 multiplexers and five demultiplexers each, the number is not limited to this number. Furthermore, 4-phase DrSK modulation and demodulation is not limited to 4-phase, but 1, for example, 8-phase DPS.
K modulation and demodulation or L6 quadrature amplitude modulation and demodulation (QAM) may be used.

〔発明の効果〕〔Effect of the invention〕

以上、詳細に説明したように、本発明によれば、複数個
のアナログ信号を時分割多重化し、時分割多重化してで
きた複数個の時分割多重化信号を周波数分割多重化して
伝送するようにしたため、衛星放送では27MHz  
の周波数帯域幅が必要でおったのが5MHz の周波数
帯域幅で伝送することが可能となシ、従来実現が困難で
あったCATV回線全使用し−fcPCM音楽信号等の
高品質、多チャンネル伝送が可能となる。
As described in detail above, according to the present invention, a plurality of analog signals are time-division multiplexed, and a plurality of time-division multiplexed signals generated by time-division multiplexing are frequency-division multiplexed and transmitted. Therefore, satellite broadcasting uses 27MHz.
It is now possible to transmit data with a frequency bandwidth of 5 MHz, which required a frequency bandwidth of becomes possible.

【図面の簡単な説明】[Brief explanation of drawings]

第り図(alおよび(blは本発明の一実施例の送信装
置および受信装置を示すブロック図、第り図(C1は送
信装置の多重化部の詳細構成を示すブロック図、第り図
fdlは受信装置の多重化分離部の詳細構成を示すブロ
ック図、第2図は第り図における送信装置の出力信号の
一例を示す周波数スペクトル図である。 図において、t−t−L−5・・・・・・多重化部、2
−L〜2−5・・・・・・多重化分離部、11〜L4・
・・・・・アナログ・ディジタル変換器、21〜24・
・・・・・符号化回路、31・・・・・・多重化回路、
32・・・・・・4相差動位相変調回路、33・・・・
・・帯域F波器、34・・・・・・振幅変調回路、35
・・・・・・局部発振回路、36・・・・・・・・・・
・・帯域戸波器、41・・・・・・結合回路、5L・・
・・・・分配回路、61・・・・・・帯域F波器、62
・・・・・・振幅復調回路、63・・・・・・局部発振
回路、64・・・・・・帯域F波器、65・・・・・・
4相差動位相復調回路、66・・・・・・多重化分離回
路、71〜74・・・・・・復号化回路、8L〜84・
・・・・・ディジタル・アナログ変換器である。 ′・仁、+ 67図G) 第7図  (b) 〃17β、A : アナログ丹ジ久し15巾史茗訊3z
: 4相井重〃位粕隆詣七1昏 第1図(c) 〃4 ヤ (、t  二 4u*111;)i14fLm≦1;1
;;1:11;1)iillj;i:i;i;;!i、
、。 15/7θZ7θ3,114  :  9”rジタル・
アナログ変お延賓訴       1第/図(d)
Figures 1 and 2 are block diagrams showing a transmitter and receiver according to an embodiment of the present invention, Figure C1 is a block diagram showing the detailed configuration of the multiplexing section of the transmitter, and Figure fdl 2 is a block diagram showing the detailed configuration of the multiplexing and demultiplexing section of the receiving device, and FIG. 2 is a frequency spectrum diagram showing an example of the output signal of the transmitting device in FIG. ...Multiplexing section, 2
-L~2-5... Multiplexing and demultiplexing section, 11~L4.
...Analog-digital converter, 21-24.
... Encoding circuit, 31 ... Multiplexing circuit,
32...4-phase differential phase modulation circuit, 33...
...Band F wave device, 34...Amplitude modulation circuit, 35
・・・・・・Local oscillation circuit, 36・・・・・・・・・
・・Band door transducer, 41 ・・・Coupling circuit, 5L・・
...Distribution circuit, 61...Band F wave device, 62
......Amplitude demodulation circuit, 63...Local oscillation circuit, 64...Band F wave generator, 65...
4-phase differential phase demodulation circuit, 66... multiplexing/demultiplexing circuit, 71-74... decoding circuit, 8L-84...
...A digital-to-analog converter. '・Jin, + 67 Figure G) Figure 7 (b) 〃17β, A: Analog tanji long time 15 width history meiken 3z
: 4 Aii Shige〃I Kasu Takamori 71 Figure 1 (c)
;;1:11;1)iillj;i:i;i;;! i,
,. 15/7θZ7θ3, 114: 9”r digital
Analog strange case 1/Figure (d)

Claims (1)

【特許請求の範囲】 第一のアナログ信号を入力して第一のディジタル信号に
変換して出力する複数個のアナログ・ディジタル変換器
と、前記アナログ・ディジタル変換器に対応して設けら
れ前記第一のディジタル信号を入力して第一のPCM信
号に符号化して出力する複数個の符号化回路と、前記第
一のPCM信号を入力して時分割多重化した第一の時分
割多重化信号を出力する多重化回路と、前記第一の時分
割多重化信号を入力して第一の位相変調信号に変調して
出力する位相変調回路と、前記第一の位相変調信号を入
力して不要成分を除去した第二の位相変調信号を出力す
る第一の帯域ろ波器と、局部発振周波数を発生する第一
の局部発振回路と、前記第二の位相変調信号を入力し前
記局部発振周波数によって周波数変換した第一の振幅変
調信号を出力する振幅変調回路と、前記第一の振幅変調
信号を入力して不要成分を除去した第二の振幅変調信号
を出力する第二の帯域ろ波器とを有する複数個の多重化
部と、 前記複数個の多重化部の出力信号を入力して周波数分割
多重化した周波数分割多重化信号をCATV回線に出力
する結合回路とを備える送信装置および、 前記周波数分割多重化信号を入力して複数個の多重化分
離部に分配して出力する分配回路と、前記分配回路の出
力信号のうちのいずれか1個の出力信号を入力して所定
の周波数帯域信号を選択し第三の振幅変調信号を出力す
る第三の帯域ろ波器と、局部発振周波数を発生する第二
の局部発振回路と、前記第三の振幅変調信号を入力して
前記第二の局部発振回路が発生する前記局部発振周波数
によって周波数逆変換した振幅復調信号を出力する振幅
復調回路と、前記振幅復調信号を入力して不要成分を除
去した第三の位相変調信号を出力する第四の帯域ろ波器
と、前記第三の位相変調信号を入力して第二の時分割多
重化信号に復調して出力する位相復調回路と、前記第二
の時分割多重化信号を入力して複数の第二のPCM信号
に分離して複数個の復号化回路に出力する多重化分離回
路と、前記第二のPCM信号を入力して第二のディジタ
ル信号に復号化して出力する前記複数個の復号化回路と
、前記復号化回路に対応して設けられ前記第二のディジ
タル信号を入力して第二のアナログ信号に変換して出力
する複数個のディジタル・アナログ変換器とを有する前
記複数個の多重化分離部とを備える受信装置と を具備することを特徴とするCATV用PCM信号伝送
方式。
[Claims] A plurality of analog-to-digital converters that input a first analog signal, convert it to a first digital signal, and output the first digital signal; a plurality of encoding circuits that input one digital signal, encode it into a first PCM signal, and output it; and a first time division multiplexed signal that inputs the first PCM signal and time division multiplexed it. a multiplexing circuit that outputs the first time division multiplexed signal, a phase modulation circuit that inputs the first time division multiplexed signal and modulates it into a first phase modulation signal, and outputs the first phase modulation signal; a first bandpass filter that outputs a second phase modulation signal from which components have been removed; a first local oscillation circuit that generates a local oscillation frequency; an amplitude modulation circuit that outputs a first amplitude modulation signal frequency-converted by the above, and a second bandpass filter that receives the first amplitude modulation signal and outputs a second amplitude modulation signal from which unnecessary components are removed. a plurality of multiplexing units having a plurality of multiplexing units, and a coupling circuit that inputs the output signals of the plurality of multiplexing units and performs frequency division multiplexing to output a frequency division multiplexed signal to a CATV line; a distribution circuit that inputs the frequency division multiplexed signal, distributes it to a plurality of demultiplexing units, and outputs it; and a distribution circuit that inputs the output signal of any one of the output signals of the distribution circuit and outputs the signal at a predetermined frequency. a third bandpass filter that selects a band signal and outputs a third amplitude modulation signal; a second local oscillation circuit that generates a local oscillation frequency; an amplitude demodulation circuit that outputs an amplitude demodulation signal whose frequency is inversely converted by the local oscillation frequency generated by the second local oscillation circuit; and a third phase modulation signal that receives the amplitude demodulation signal and removes unnecessary components. a fourth bandpass filter, a phase demodulation circuit that inputs the third phase modulation signal, demodulates it into a second time division multiplexed signal, and outputs the second time division multiplexed signal; and a phase demodulation circuit that receives the second time division multiplexed signal; a multiplexing and demultiplexing circuit that inputs the second PCM signal, decodes it into a second digital signal, and outputs the signal as a second digital signal; It has a plurality of decoding circuits and a plurality of digital-to-analog converters provided corresponding to the decoding circuits and inputting the second digital signal, converting it into a second analog signal, and outputting the second analog signal. A PCM signal transmission system for CATV, comprising: a receiving device having the plurality of demultiplexing units.
JP17968884A 1984-08-29 1984-08-29 Pcm signal transmission system for catv Granted JPS6157136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17968884A JPS6157136A (en) 1984-08-29 1984-08-29 Pcm signal transmission system for catv

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17968884A JPS6157136A (en) 1984-08-29 1984-08-29 Pcm signal transmission system for catv

Publications (2)

Publication Number Publication Date
JPS6157136A true JPS6157136A (en) 1986-03-24
JPH0439813B2 JPH0439813B2 (en) 1992-06-30

Family

ID=16070127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17968884A Granted JPS6157136A (en) 1984-08-29 1984-08-29 Pcm signal transmission system for catv

Country Status (1)

Country Link
JP (1) JPS6157136A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02212001A (en) * 1988-12-22 1990-08-23 Th Kieserling & Albrecht Gmbh & Co Barker
US4991207A (en) * 1988-03-26 1991-02-05 Kabushiki Kaisha Kenwood One-way address transmission system of PCM music
US5600365A (en) * 1994-01-28 1997-02-04 Sony Corporation Multiple audio and video signal providing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991207A (en) * 1988-03-26 1991-02-05 Kabushiki Kaisha Kenwood One-way address transmission system of PCM music
JPH02212001A (en) * 1988-12-22 1990-08-23 Th Kieserling & Albrecht Gmbh & Co Barker
US5600365A (en) * 1994-01-28 1997-02-04 Sony Corporation Multiple audio and video signal providing apparatus

Also Published As

Publication number Publication date
JPH0439813B2 (en) 1992-06-30

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