JPS63114359A - Method for switching communication mode - Google Patents
Method for switching communication modeInfo
- Publication number
- JPS63114359A JPS63114359A JP25911886A JP25911886A JPS63114359A JP S63114359 A JPS63114359 A JP S63114359A JP 25911886 A JP25911886 A JP 25911886A JP 25911886 A JP25911886 A JP 25911886A JP S63114359 A JPS63114359 A JP S63114359A
- Authority
- JP
- Japan
- Prior art keywords
- mode
- voice
- modem
- signal
- communication
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 16
- 238000001514 detection method Methods 0.000 abstract description 16
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000005236 sound signal Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は通信モード切り換え方法、殊に電話の如く音声
による通信装置とファックスの如くモデムを介する通信
装置とを切り換え使用する通信システムの通信モード切
り換え方法に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a communication mode switching method, particularly a communication mode of a communication system that switches between a voice communication device such as a telephone and a modem communication device such as a fax machine. Regarding the switching method.
(従来技術)
電話の如く音声による通信とファックスの如くモデムを
介しての通信とを適宜切り換えて信号の送受を行う通信
システムは9例えば第2図((支)に示す如く電話機1
とモデム2を備え九ファックス3とを並列に接続し、フ
ァックス3或は電話機1を使用する場合には切り換え装
置4に於いてこれが内蔵する検出回路5にて所定の信号
を検出し切り換えスイッチ6により夫々ファックス(モ
デム)モード或は音声モードに切り換えるものである。(Prior Art) A communication system that transmits and receives signals by appropriately switching between voice communication such as a telephone and communication via a modem such as a fax is based on a telephone 1 as shown in FIG.
and a modem 2 are connected in parallel, and when the fax 3 or the telephone 1 is used, the switching device 4 detects a predetermined signal with its built-in detection circuit 5 and switches the changeover switch 6. The mode is switched to fax (modem) mode or voice mode, respectively.
而して前記切り換えを行う手法としては、従来同図(b
)の状態遷移図に示す如くシステムが音声モードにある
場合にはモデム信号の先頭に現われるトレーニング信号
を検出してモデムモードへ切り換え、シ゛ステムがモデ
ムモードにある場合には信号の存在しないことを検出し
て音声モードへ切り換える方法が一般的であった。As a method for performing the above-mentioned switching, conventionally, the method shown in FIG.
) When the system is in voice mode, it detects the training signal that appears at the beginning of the modem signal and switches to modem mode, and when the system is in modem mode, it detects the absence of the signal. The common method was to switch to voice mode.
しかしながら、上述した如きモード切り換え方法にあっ
ては、システムが音声モードにある時に音声信号な誤り
てトレーニング信号と認識しモデムモードへ切り換わっ
たとしても音声伝送中話者が長時間沈黙する事は一般に
考えられない為、音声モードへの復帰は極めて困難であ
るという欠陥があっ九。However, with the mode switching method described above, even if the system mistakenly recognizes a voice signal as a training signal when it is in voice mode and switches to modem mode, the speaker will not be silent for a long time during voice transmission. The flaw is that it is extremely difficult to return to voice mode because it is generally inconceivable.
(発明の目的)
本発明は上述した如き従来の通信モード切り換え方法の
欠陥を除去する為になされたものであってシステムが音
声モードにある時に誤ってモデムモードへの切り換えが
発生し九場合にも容易に音声モードへ復帰し得る通信モ
ード切り換え方法を提供する事を目的とする。(Object of the Invention) The present invention has been made to eliminate the deficiencies of the conventional communication mode switching method as described above. It is an object of the present invention to provide a communication mode switching method that allows easy return to voice mode.
(発明の概要)
上述の目的を達成する為本発明に係る通信モード切り換
え方法はモデムモードから音声モードへの切り換えを音
声信号検出によりて行うものである。(Summary of the Invention) In order to achieve the above-mentioned object, a communication mode switching method according to the present invention switches from modem mode to voice mode by detecting a voice signal.
(実施例)
以下本発明を図面に示した実施例によって詳細に説明す
る。(Examples) The present invention will be explained in detail below using examples shown in the drawings.
第1図(a)は本発明に係る通信モード切り換え方法を
説明する状態遷移図でありてシステムをモデムモードか
ら音声モードへ切り換える際。FIG. 1(a) is a state transition diagram illustrating a communication mode switching method according to the present invention when switching the system from modem mode to voice mode.
音声信号によるものであることを示す。これを実現する
為には例えば同図(b)の如くすればよい。Indicates that it is based on an audio signal. In order to realize this, for example, the method shown in FIG. 3(b) may be used.
即ち前記第2図(a)において切り楔装置4が内蔵する
検出口!35に代えてモデムモード及び音声モードの信
号の伝送ラベンにそれぞれ音声信号検出用回路7及びト
レーニング信号検出用回路8を設けこれら雨検出回路の
出力によって切り換えスイッチ6を切り換えるようにす
ればよいO
伺、前記音声信号検出用回路としてはl@3図(a)K
示すごとく、基本的には音声信号のスペクトラムがはy
IKHz以下にエネルギーが集中し、モデム信号のスペ
クトラムが同図(blに示す如く上述の関係が逆転する
ことに注目し例えばQ、5KHz近傍のエネルギーと2
.5KHz近傍のエネルギーとを比較し両者の差がある
一定値以上である場合には音声信号であると判断するよ
うな回路を用いればよい。That is, the detection port built into the cutting wedge device 4 in FIG. 2(a)! 35, an audio signal detection circuit 7 and a training signal detection circuit 8 may be provided in the modem mode and audio mode signal transmission laben, respectively, and the changeover switch 6 may be switched by the output of these rain detection circuits. , as the audio signal detection circuit l@3(a)K
As shown, basically the spectrum of the audio signal is
Energy concentrates below IKHz, and the spectrum of the modem signal changes as shown in the same figure (bl), where the above relationship is reversed.
.. A circuit may be used that compares the energy around 5 KHz and determines that it is an audio signal if the difference between the two is a certain value or more.
また、前記トレーニング信号のスペクトラムは例えば9
600bps(CCITT勧告V29)の場合には同図
(c)に示す如く音声帯域内に於いて3つの周波数を有
する複合正弦波であることに注目し上記3つの周波数成
分のみが到来した事を検出すればよい。Further, the spectrum of the training signal is, for example, 9
In the case of 600 bps (CCITT Recommendation V29), it is noted that it is a composite sine wave with three frequencies within the audio band as shown in the same figure (c), and it is detected that only the above three frequency components have arrived. do it.
上述の音声信号の検出を行う為には例えば第4図(al
K示す如<0.5KH2と、2.5KH2のバンドパ
スフィルタ9及び10の出方を積分器11を介して比較
器12で比較し両者のエネルギーの差が所定の値以上の
場合に音声信号が到来したものと判断する。またトレー
ニング信号の検出を行う為には例えば同図(b)に示す
如<0.5KH2,1,7KHz及び2.9KHzのパ
ント0バスフイルタ13.14及び15の出力を積分器
11を介して得′られる3つの周波数成分のエネルギー
を加算器16において加算した出力と、入力信号を積分
器11を介して得られる全信号エネルギーと′を比較器
16で比較する。このとき加算出力が所定の値以上であ
り、加算出力と全信号エネルギーとの差が所定の値以下
であるならばトレーニング信号が到来したものと判断す
る。このとき検出回路を構成するバンドパスフィルタ、
積分器、加算器及び比較器については、これらをアナロ
グ回路或はデジタル回路のどちらで構成してもよい。In order to detect the above-mentioned audio signal, for example, the method shown in FIG. 4 (al.
The comparator 12 compares the outputs of the bandpass filters 9 and 10 of K<0.5KH2 and 2.5KH2 via the integrator 11, and if the difference in energy between the two is greater than a predetermined value, the audio signal is is determined to have arrived. In addition, in order to detect the training signal, for example, as shown in FIG. A comparator 16 compares the output obtained by adding the energies of the three frequency components obtained by the adder 16 with the total signal energy obtained from the input signal via the integrator 11. At this time, if the addition output is greater than or equal to a predetermined value and the difference between the addition output and the total signal energy is less than or equal to the predetermined value, it is determined that the training signal has arrived. At this time, a bandpass filter that constitutes the detection circuit,
The integrator, adder, and comparator may be constructed from either analog circuits or digital circuits.
このようなセンサを用いることによって、システムが音
声モード&C6る時に音声信号を誤ってトレーニング信
号と認識しモデムモードへ切9換ったとしても容易に音
声モードへ復帰することが可能である。By using such a sensor, even if the system erroneously recognizes an audio signal as a training signal and switches to modem mode when in audio mode &C6, it can easily return to audio mode.
閘前記J図(alに示した音声信号検出回路は原理的な
ものであって現実の製品に適用する場合にはサンプル周
波数を増やして、即ちバンドパスフィルタの数を増やし
て正確なスペクトラム分析を行なうべきであることはい
うまでもないO
(発明の効果)
本発明は以上説明した如く構成するものであるから通信
システムが音声モードにある時誤りてモデムモードに切
り換わっ九としても話者が長時間沈黙することは一般に
あり得ないので音声信号の検出により容易に音声モード
に復帰せしめるうえで著しい効果がある。The audio signal detection circuit shown in Figure J (al) above is a basic one, and when applied to an actual product, the sampling frequency should be increased, that is, the number of bandpass filters should be increased to perform accurate spectrum analysis. It goes without saying that this should be done. (Effect of the Invention) Since the present invention is constructed as described above, even if the communication system is in the voice mode and accidentally switches to the modem mode, the speaker Since it is generally not possible to remain silent for a long period of time, detection of an audio signal has a significant effect in easily returning to the audio mode.
このような機能を付与する為装置の構成は幾分複雑にな
るが9通信システムの性能の向上はこれを補って余りあ
るものである。Although the configuration of the device becomes somewhat complicated to provide such a function, the improved performance of the 9 communication system more than compensates for this.
簗1図(atは本発明に係る通信モード切り換え方法の
概念を説明する図、同図(b)はこれを実現する為の一
実施例を示すブロック図、第2図(a)は従来の通信モ
ード切り換え装置のブロック図、同図fb)はその概念
説明図、第3図(a)乃至(c)は夫々音声信号、モデ
ム信号及びトレーニング信号の平均的なスペクトラム図
、第4図(al及び(blは夫々本発明に於いて用いる
音声信号及びトレーニング信号検出回路の一実施例を示
すブロック図である。
1・・・・・・・・・音声による通信装置、 2・
・・・・・・・・モデム、 3・・・・・・・・・
モデムを介する通信装置、 4・・・・・・・・・
切り換え装置。
5.8及び7・・・・・・・・・信号検出装置。Figure 1 (at is a diagram explaining the concept of the communication mode switching method according to the present invention, Figure 2 (b) is a block diagram showing one embodiment for realizing this, and Figure 2 (a) is a diagram explaining the concept of the communication mode switching method according to the present invention. A block diagram of the communication mode switching device, FIG. and (bl are block diagrams showing one embodiment of the audio signal and training signal detection circuits used in the present invention, respectively. 1... Voice communication device, 2.
・・・・・・・・・Modem, 3・・・・・・・・・
Communication device via modem, 4...
switching device. 5.8 and 7... Signal detection device.
Claims (1)
換え使用する通信システムに於いて、前記通信システム
がモデムモードにある場合には音声信号の、又音声モー
ドにある場合にはモデムのトレーニング信号の到来を検
出していずれのモードにて通信を行うかを決定するよう
にしたことを特徴とする通信モード切り換え方法。In a communication system that switches between a communication device using voice and a communication device via a modem, the arrival of a voice signal when the communication system is in the modem mode, and the arrival of a training signal for the modem when the communication system is in the voice mode. A communication mode switching method characterized in that the communication mode is determined by detecting the communication mode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25911886A JPS63114359A (en) | 1986-10-30 | 1986-10-30 | Method for switching communication mode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25911886A JPS63114359A (en) | 1986-10-30 | 1986-10-30 | Method for switching communication mode |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63114359A true JPS63114359A (en) | 1988-05-19 |
Family
ID=17329564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25911886A Pending JPS63114359A (en) | 1986-10-30 | 1986-10-30 | Method for switching communication mode |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63114359A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6417177A (en) * | 1987-07-10 | 1989-01-20 | Matsushita Electric Ind Co Ltd | Optical pattern detector |
JPH0211056A (en) * | 1988-06-29 | 1990-01-16 | Canon Inc | Data communication equipment |
-
1986
- 1986-10-30 JP JP25911886A patent/JPS63114359A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6417177A (en) * | 1987-07-10 | 1989-01-20 | Matsushita Electric Ind Co Ltd | Optical pattern detector |
JPH0211056A (en) * | 1988-06-29 | 1990-01-16 | Canon Inc | Data communication equipment |
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