JPH0315383B2 - - Google Patents
Info
- Publication number
- JPH0315383B2 JPH0315383B2 JP56165354A JP16535481A JPH0315383B2 JP H0315383 B2 JPH0315383 B2 JP H0315383B2 JP 56165354 A JP56165354 A JP 56165354A JP 16535481 A JP16535481 A JP 16535481A JP H0315383 B2 JPH0315383 B2 JP H0315383B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- analog
- circuit
- input
- digital
- 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.)
- Expired - Lifetime
Links
- 238000001228 spectrum Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000003595 spectral effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 7
- 238000000605 extraction Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Description
【発明の詳細な説明】
本発明は、信号受信方法に関し、特にデイジタ
ル信号とアナログ信号のいずれをも受信可能な受
信機において、受信信号がアナログ信号あるいは
デイジタル信号のいずれであるかを判定し、判定
結果に従つて受信手段を切り換える方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal receiving method, and in particular, in a receiver capable of receiving both digital and analog signals, determining whether a received signal is an analog signal or a digital signal, The present invention relates to a method of switching receiving means according to a determination result.
アナログ信号とデイジタル信号を切り換えて伝
送するシステムを用いると、例えば音声信号を伝
送する場合、通常はアナログで伝送し、重要な会
話のときにはデイジタル符号で暗号化して伝送す
ることが、可能となる。 By using a system that switches and transmits analog and digital signals, for example, when transmitting voice signals, it is possible to normally transmit them in analog form, but during important conversations, it is possible to encrypt and transmit them using digital codes.
デイジタル信号とアナログ信号とでは受信手段
が異なる。例えばデイジタル信号を受信する場合
は符号の識別および同期信号の抽出が必要である
が、アナログ信号を受信する場合このような操作
は必要でない。アナログ信号とデイジタル信号を
切り換えて伝送するシステムにおいては、受信し
た信号がアナログ信号かまたはデイジタル信号か
を知り、受信信号に適した受信手段を選ぶ必要が
ある。 Reception means are different for digital signals and analog signals. For example, when receiving a digital signal, it is necessary to identify the code and extract the synchronization signal, but when receiving an analog signal, such operations are not necessary. In a system that switches between analog and digital signals for transmission, it is necessary to know whether a received signal is an analog signal or a digital signal, and to select a receiving means suitable for the received signal.
受信信号がデイジタル信号あるいはアナログ信
号のいずれであるかを自動的に判定し、受信手段
を切り換える従来の受信信号判定方法について説
明する。 A conventional received signal determination method for automatically determining whether a received signal is a digital signal or an analog signal and switching the receiving means will be described.
従来の方法はデイジタル信号からは必ず同期信
号が抽出されるという性質を利用している。 The conventional method utilizes the property that a synchronization signal is always extracted from a digital signal.
受信信号から同期信号が抽出されるか否かを検
出し、同期信号が検出された場合はデイジタル信
号と判定し、検出されなかつた場合はアナログ信
号と判定し、判定結果に従つて受信手段を切り換
える受信信号判定方法が用いられている。 It detects whether or not a synchronization signal is extracted from the received signal, and if a synchronization signal is detected, it is determined that it is a digital signal, and if it is not detected, it is determined that it is an analog signal, and the receiving means is activated according to the determination result. A switching received signal determination method is used.
第１図に従来の方法を用いた一例について構成
を示す。入力した基底帯域信号Siは三本の信号に
分岐され、ひとつは切り換え回路１０２に入力
し、ひとつはデイジタル信号の符号識別回路１０
３に入力し、ひとつは同期信号抽出回路１０６に
入力する。同期信号抽出回路出力Spはふたつに
分岐され、ひとつは識別回路１０３に入力し、ひ
とつは同期信号検出回路１０７に入力する。識別
回路１０３出力は復号器１０４に入力し、復号器
１０４出力Sdは切り換え回路１０２に入力する。
同期信号検出回路１０７の出力は切り換え回路１
０２に制御信号として入力する。この制御信号に
応答して、同期信号が検出される場合は、切り換
え回路１０２はデイジタル信号の受信手段に接続
され、出力端子１０５から信号Sdが出力される。
同期信号が検出されなかつた場合には切り換え回
路１０２はアナログ信号の受信手段に接続され出
力端子１０５から信号Siが出力される。 FIG. 1 shows the configuration of an example using a conventional method. The input baseband signal Si is branched into three signals, one input to the switching circuit 102 and one input to the digital signal code identification circuit 10.
3, and one is input to the synchronization signal extraction circuit 106. The synchronization signal extraction circuit output Sp is branched into two parts, one input to the identification circuit 103 and one input to the synchronization signal detection circuit 107. The output of the identification circuit 103 is input to the decoder 104, and the output Sd of the decoder 104 is input to the switching circuit 102.
The output of the synchronization signal detection circuit 107 is the switching circuit 1
02 as a control signal. In response to this control signal, when a synchronization signal is detected, the switching circuit 102 is connected to a digital signal receiving means, and a signal Sd is output from the output terminal 105.
If no synchronizing signal is detected, the switching circuit 102 is connected to the analog signal receiving means and the signal Si is output from the output terminal 105.
上述した従来の方法を用いた場合、受信された
信号がアナログ信号であつても同期信号が抽出さ
れた場合判定を誤る。例えば移動通信におけるア
ナログ選択呼出信号のように受信信号が正弦波信
号の場合で、特にその周波数が抽出されるべき同
期信号周波数の１／Ｎ（Ｎは正整数）の場合に判
定の誤りが起る。 When the above-described conventional method is used, even if the received signal is an analog signal, the determination will be incorrect if a synchronization signal is extracted. For example, when the received signal is a sine wave signal such as an analog selective call signal in mobile communication, a judgment error may occur especially when the frequency is 1/N (N is a positive integer) of the synchronization signal frequency to be extracted. Ru.
本発明の目的は、受信信号がデイジタル信号か
アナログ信号かの判定および受信手段の切りかえ
を従来の方法よりもより確実に行なえる受信信号
判定方法を提供することにある。 An object of the present invention is to provide a received signal determination method that can more reliably determine whether a received signal is a digital signal or an analog signal and switch the receiving means than conventional methods.
デイジタル信号は“１”また“０”のパルス列
であり、無限の周波数成分を持つが、伝送を行う
場合帯域制限を行つて伝送を行う。特にＦビツ
ト／秒の伝送速度に対してＦ／２Hzのコサイン２
乗特性をもつた低域フイルタ（ナイキストフイル
タ）で帯域制限して伝送した場合全く劣化なく伝
送できることが知られている。この時の帯域制限
された信号は第２図Ｂに示すようにDC〜Ｆ／２
Hzまで均一に電力スペクトル成分をもつ。一方音
声等のアナログ信号は第２図Ａに示したように
300Hz〜3KHzに電力スペクトル成分をもつ。この
例では第２図Ｂの斜線部の帯域において、デイジ
タル信号は電力スペクトル成分をもつが、アナロ
グ信号は成分をもたない。 A digital signal is a pulse train of "1" or "0" and has infinite frequency components, but when it is transmitted, it is transmitted by limiting the band. In particular, for a transmission rate of F bits/second, the cosine 2 of F/2Hz
It is known that if the band is limited and transmitted using a low-pass filter (Nyquist filter) with multiplicative characteristics, the transmission can be performed without any deterioration. The band-limited signal at this time is from DC to F/2 as shown in Figure 2B.
It has a uniform power spectrum component up to Hz. On the other hand, analog signals such as audio are as shown in Figure 2A.
It has a power spectrum component between 300Hz and 3KHz. In this example, the digital signal has a power spectrum component in the shaded band in FIG. 2B, but the analog signal does not.
本発明によればデイジタル信号または帯域制限
された基底帯域内に電力スペクトル成分をもたな
い周波数領域（以下アナログ帯域外と記す）をも
つアナログ信号を伝送するシステムにおいて、受
信信号から同期信号が抽出されたことを検出し、
かつ受信信号においてアナログ帯域外スペクトル
成分が検出された時に受信信号がデイジタル信号
と判定し、同期信号またはアナログ帯域外成分の
どちらか一方でも検出できなかつたときは受信信
号がアナログ信号と判定し、受信信号に適した受
信手段に切り換える受信手段判定方法が得られ
る。 According to the present invention, a synchronization signal is extracted from a received signal in a system that transmits a digital signal or an analog signal having a frequency region (hereinafter referred to as outside the analog band) that does not have a power spectrum component within a band-limited baseband. detects that
and when an analog out-of-band spectrum component is detected in the received signal, the received signal is determined to be a digital signal, and when either the synchronization signal or the analog out-of-band component cannot be detected, the received signal is determined to be an analog signal, A receiving means determination method for switching to a receiving means suitable for the received signal can be obtained.
以下図を用いて詳細に説明する。 This will be explained in detail below using figures.
第３図に本発明の方法を用いた受信機の実施例
を示す。入力した受信基底帯域信号Siは四本に分
岐され、ひとつは切換回路３０６に入力し、ひと
つは識別回路３０２に入力し、ひとつは同期信号
抽出回路３０３に入力し、ひとつはアナログ帯域
外スペクトル検出回路３０７に入力する。同期信
号抽出回路３０３出力の同期信号はふたつに分岐
され、ひとつは識別回路３０２に供給され、ひと
つは同期信号抽出回路３０４に入力する。識別回
路３０２出力は復号器３０５を通り、信号Sdと
なつて切換回路３０６に入力する。同期信号検出
回路３０４出力およびアナログ帯域外スペクトル
検出回路３０７出力は制御信号発生回路３０８に
入力し、制御信号発生回路３０８出力である制御
信号Scは、切換回路３０６に供給される。 FIG. 3 shows an embodiment of a receiver using the method of the present invention. The input reception baseband signal Si is branched into four signals: one is input to the switching circuit 306, one is input to the identification circuit 302, one is input to the synchronization signal extraction circuit 303, and one is input to the analog out-of-band spectrum detection circuit. input to circuit 307; The synchronization signal output from the synchronization signal extraction circuit 303 is branched into two, one being supplied to the identification circuit 302 and one input to the synchronization signal extraction circuit 304. The output of the identification circuit 302 passes through the decoder 305 and is input to the switching circuit 306 as a signal Sd. The output of the synchronization signal detection circuit 304 and the output of the analog out-of-band spectrum detection circuit 307 are input to the control signal generation circuit 308, and the control signal Sc, which is the output of the control signal generation circuit 308, is supplied to the switching circuit 306.
同期信号が検出されたことを示す信号およびア
ナログ帯域外スペクトルが検出されたことを示す
信号の双方が、制御信号発生回路３０８に入力す
ると、制御信号発生回路３０８と出力信号Scに
より切換回路３０６は信号Sdを出力する。この
結果デイジタル信号受信手段が選択される。ま
た、同期信号またはアナログ帯域外スペクトルの
どちらか一方でも検出されなかつた場合、制御信
号発生回路３０８の出力信号Scにより切換回路
３０６は信号Siを出力する。その結果、アナログ
信号受信手段が選択される。受信側において雑音
等に起因するアナログ帯域外スペクトル成分をも
ち、かつ同期信号周波数の１／Ｎ（Ｎは正整数）
の成分をもつアナログ信号を受信する確率はきわ
めてまれである。よつて以上に述べた方法を用い
ることにより、受信信号がデイジタル信号かアナ
ログ信号かを判定し、判定結果に従つて受信手段
を切換えることが従来よりもより正確にできる方
法が得られる。 When both the signal indicating that a synchronization signal has been detected and the signal indicating that an analog out-of-band spectrum has been detected are input to the control signal generating circuit 308, the switching circuit 306 is activated by the control signal generating circuit 308 and the output signal Sc. Outputs signal Sd. As a result, the digital signal receiving means is selected. Furthermore, if either the synchronization signal or the analog out-of-band spectrum is not detected, the switching circuit 306 outputs the signal Si in response to the output signal Sc of the control signal generation circuit 308. As a result, the analog signal receiving means is selected. The receiving side has analog out-of-band spectrum components due to noise, etc., and is 1/N of the synchronization signal frequency (N is a positive integer).
The probability of receiving an analog signal with components of is extremely rare. Therefore, by using the method described above, it is possible to obtain a method in which it is possible to determine whether a received signal is a digital signal or an analog signal and to switch the receiving means in accordance with the determination result more accurately than in the past.
なお、以上の説明において、基底帯域信号を受
信した場合について述べているが、変調された信
号の伝送の場合は、復調回路が入力端子の前に加
わると考えれば全く同様に考えらえる。 In the above description, the case where a baseband signal is received is described, but in the case of transmitting a modulated signal, the same can be considered if a demodulation circuit is added before the input terminal.
切換回路３０６は、出力端子の直前にあるが、
同期信号抽出回路３０３への入力信号が出たあと
なら、どの位置でもかまわず、さらに出力手段は
この場合、デイジタル信号の場合も、アナログ信
号の場合も同一の出力回路から出力される例を示
したが、デイジタル信号とアナログ信号の場合で
別々の出力回路を用いる場合も考えられる。ま
た、切り換え回路３０６を２個のスイツチで構成
しても同じ機能をもつ。この場合制御信号は２つ
に分岐され、それぞれ両スイツチに入力する。 The switching circuit 306 is located just before the output terminal,
After the input signal to the synchronization signal extraction circuit 303 is output, it does not matter at any position, and in this case, the output means is shown as an example in which both the digital signal and the analog signal are output from the same output circuit. However, it is also possible to use separate output circuits for digital signals and analog signals. Further, even if the switching circuit 306 is configured with two switches, it has the same function. In this case, the control signal is branched into two, and each is input to both switches.
第１図は従来の受信信号判定方法を用いた受信
機の一例の構成を示す図で、第２図Ａ，Ｂは、そ
れぞれ音声信号、デイジタル信号のパワースペク
トル分布を示す図、第３図は、本発明による受信
信号判定方法を用いた受信機の実施例を示す構成
図である。
これらの図において、１０１，３０１は入力端
子、１０３，３０２は識別回路、１０４，３０５
は復号器、１０２，３０６は切換回路、１０６，
３０３は同期信号抽出回路、１０７，３０４は同
期信号検出回路、３０７はアナログ信号帯域外パ
ワースペクトル検出回路、３０８は制御信号発生
回路、１０５，３０９は出力端子、Siは入力基底
帯域信号、Sdは復号器出力信号、Spは同期信号、
Scは制御信号である。
FIG. 1 is a diagram showing the configuration of an example of a receiver using a conventional received signal determination method, FIGS. 2A and B are diagrams showing the power spectrum distribution of an audio signal and a digital signal, respectively, and FIG. FIG. 1 is a configuration diagram showing an embodiment of a receiver using a received signal determination method according to the present invention. In these figures, 101, 301 are input terminals, 103, 302 are identification circuits, 104, 305
is a decoder, 102, 306 is a switching circuit, 106,
303 is a synchronization signal extraction circuit, 107 and 304 are synchronization signal detection circuits, 307 is an analog signal out-of-band power spectrum detection circuit, 308 is a control signal generation circuit, 105 and 309 are output terminals, Si is an input baseband signal, and Sd is an input baseband signal. Decoder output signal, Sp is synchronization signal,
Sc is a control signal.
Claims (1)
ジタル信号の基底帯域内に電力スペクトル成分を
もたない周波数領域をもつアナログ信号を切り換
えて伝送するシステムの受信側で、受信信号が前
記デイジタル信号あるいは前記アナログ信号のい
ずれであるかを判定し、判定結果に従つて受信手
段を前記受信信号に適した手段に切り換える方法
において、前記受信信号から同期信号が抽出され
た事が検出されかつ前記アナログ信号が電力スペ
クトル成分持たない周波数領域に電力スペクトル
成分の存在検出されたときに受信信号がデイジタ
ル信号と判定し、前記同期信号または前記電力ス
ペクトルの一方でも検出されなかつたときには受
信信号がアナログ信号と判定し、判定結果に従つ
て受信手段を切り換えることを特徴とする受信信
号判定方法。1. On the receiving side of a system that switches and transmits a digital signal and an analog signal having a frequency region that does not have a power spectrum component within the base band of the band-limited digital signal, the received signal is either the digital signal or the analog signal. In the method of determining whether the analog signal is a signal and switching the receiving means to a means suitable for the received signal according to the determination result, it is detected that a synchronization signal is extracted from the received signal and the analog signal is The received signal is determined to be a digital signal when the presence of a power spectrum component is detected in a frequency region having no spectral component, and the received signal is determined to be an analog signal when either the synchronization signal or the power spectrum is not detected, A received signal determination method characterized by switching a receiving means according to a determination result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16535481A JPS5866424A (en) | 1981-10-16 | 1981-10-16 | Deciding method of received signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16535481A JPS5866424A (en) | 1981-10-16 | 1981-10-16 | Deciding method of received signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5866424A JPS5866424A (en) | 1983-04-20 |
| JPH0315383B2 true JPH0315383B2 (en) | 1991-02-28 |
Family
ID=15810766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16535481A Granted JPS5866424A (en) | 1981-10-16 | 1981-10-16 | Deciding method of received signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5866424A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61187434A (en) * | 1985-02-14 | 1986-08-21 | Olympus Optical Co Ltd | Picture processing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55166359A (en) * | 1979-06-14 | 1980-12-25 | Kokusai Denshin Denwa Co Ltd <Kdd> | Detector for modulated data signal |
| JPS566550A (en) * | 1979-06-27 | 1981-01-23 | Mitsubishi Electric Corp | Data transmission system |
-
1981
- 1981-10-16 JP JP16535481A patent/JPS5866424A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55166359A (en) * | 1979-06-14 | 1980-12-25 | Kokusai Denshin Denwa Co Ltd <Kdd> | Detector for modulated data signal |
| JPS566550A (en) * | 1979-06-27 | 1981-01-23 | Mitsubishi Electric Corp | Data transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5866424A (en) | 1983-04-20 |
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