JP2919678B2 - Signal transmission equipment - Google Patents
Signal transmission equipmentInfo
- Publication number
- JP2919678B2 JP2919678B2 JP22657392A JP22657392A JP2919678B2 JP 2919678 B2 JP2919678 B2 JP 2919678B2 JP 22657392 A JP22657392 A JP 22657392A JP 22657392 A JP22657392 A JP 22657392A JP 2919678 B2 JP2919678 B2 JP 2919678B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- level
- output circuit
- power
- 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
- 230000008054 signal transmission Effects 0.000 title description 13
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Landscapes
- Transmitters (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばダイヤリングト
ーンなどの信号を発生し伝送する信号伝送装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission apparatus for generating and transmitting a signal such as a dialing tone.
【０００２】[0002]
【従来の技術】従来の信号伝送装置を図３に示す。１は
制御部で、例えばＣＰＵから成るものであり、２は信号
発生部で、制御部１の制御信号を受けてダイヤリングト
ーン等の信号を出力する。３は出力回路で、一般にオペ
アンプ等で構成され、信号発生２からの信号を増幅する
とともにインピーダンス整合を行う。信号発生部２の信
号の出力タイミングは、制御部１の制御信号（以下、パ
ワーダウン信号という）により制御される。このパワー
ダウン信号と信号発生部２の出力波形を図４に示す。図
４において、パワーダウン信号ａはＨレベルで信号発生
部２のパワーダウン、Ｌレベルで信号発生部２のパワー
オンを意味している。2. Description of the Related Art FIG. 3 shows a conventional signal transmission device. Reference numeral 1 denotes a control unit, which includes, for example, a CPU. Reference numeral 2 denotes a signal generation unit which receives a control signal from the control unit 1 and outputs a signal such as a dial tone. An output circuit 3 generally includes an operational amplifier and the like, amplifies the signal from the signal generator 2 and performs impedance matching. The output timing of the signal from the signal generator 2 is controlled by a control signal from the controller 1 (hereinafter, referred to as a power down signal). FIG. 4 shows the power down signal and the output waveform of the signal generator 2. In FIG. 4, the power-down signal a indicates a power-down of the signal generator 2 at H level and a power-on of the signal generator 2 at L level.
【０００３】図４からわかるように、信号発生部２の出
力信号ｂのタイミングはパワーダウン信号ａがＬレベル
の時（信号発生部２がパワーオン状態）信号を送出し、
パワーダウン信号ａがＨレベルの時（信号発生部２がパ
ワーダウン状態）信号送出を停止する。なお信号発生部
２の出力信号Ｌレベルは、信号が出力される時ＧＮＤと
ＶDDのほぼ中間レベルに維持される。As can be seen from FIG. 4, the timing of the output signal b of the signal generator 2 is such that when the power down signal a is at the L level (the signal generator 2 is in the power-on state),
When the power down signal a is at the H level (the signal generation unit 2 is in the power down state), the signal transmission is stopped. Note that the output signal L level of the signal generator 2 is maintained at a substantially intermediate level between GND and VDD when the signal is output.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上述のよ
うな信号伝送装置においては、信号発生部２の出力信号
が出力回路３へ送出されると、例えば出力回路３は信号
発生部２からの入力信号を微分して図４のＣのような波
形を出力する。この理由は次のとおりである。すなわ
ち、信号発生部２は信号の送出開始時（パワーダウン解
除時）にＧＮＤとＶDDの中間レベルに急激に変化し、信
号の停止時（パワーダウン時）に中間レベルからＧＮＤ
に再び急激に変化するため、出力回路３はこの急激に変
化する信号を微分してしまって図４のＡ，Ｂの様なヒゲ
を発生してしまうのである。このヒゲＡ，Ｂがノイズと
なり、誤動作の要因になるなど信頼性が劣る原因となっ
ていた。本発明の目的は、安定した出力波形を得て信頼
性を向上させた信号伝送装置を提供することにある。However, in the signal transmission device as described above, when the output signal of the signal generator 2 is sent to the output circuit 3, for example, the output circuit 3 receives the input signal from the signal generator 2 Is differentiated to output a waveform as shown in FIG. The reason is as follows. That is, the signal generator 2 rapidly changes to an intermediate level between GND and VDD at the start of signal transmission (at power-down release), and from the intermediate level to GND at signal stop (at power-down).
Again, the output circuit 3 differentiates the rapidly changing signal and generates a mustache as shown in FIGS. 4A and 4B. The whiskers A and B become noise and cause malfunction, such as malfunction. An object of the present invention is to provide a signal transmission device which obtains a stable output waveform and improves reliability.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明は、信号発生時には信号を発生しないときの信
号レベルとは異なる信号レベルを基準とする外部機器へ
伝送するための信号を発生する信号発生部と、この信号
発生部からの信号を微分増幅して前記外部機器へ送出す
る出力部と、前記信号発生部の動作を制御するととも
に、前記信号発生部における信号発生開始時および信号
発生終了時における前記信号レベルの変化時を除いて前
記信号発生部が動作している間だけ前記出力部を動作さ
せるように制御する制御部とを有することを要旨とす
る。In order to achieve the above object, the present invention provides a method for generating a signal to be transmitted to an external device based on a signal level different from the signal level when no signal is generated when the signal is generated. A signal generating section, an output section for differentially amplifying a signal from the signal generating section and sending the signal to the external device, and controlling an operation of the signal generating section, and at the time of starting signal generation in the signal generating section and a signal. A gist of the present invention includes a control unit that controls the output unit to operate only while the signal generation unit is operating, except when the signal level changes at the end of generation.
【０００６】[0006]
【作用】このような構成において、制御部は信号発生部
の動作を制御するとともに、信号発生部の動作時間より
短い時間だけ出力部を動作させるように制御するので、
信号発生部の信号送出開始時と送出停止時における出力
部の出力信号のヒゲの発生を防ぐことができる。In such a configuration, the control unit controls the operation of the signal generation unit and controls the output unit to operate for a shorter time than the operation time of the signal generation unit.
It is possible to prevent the output signal of the output unit from generating a beard when the signal generation unit starts transmitting the signal and when the signal generation unit stops transmitting the signal.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図１は本発明の信号伝送装置のブロック構成図、
図２は図１の信号伝送装置の動作説明を行うための動作
タイミングチャートである。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a signal transmission device according to the present invention.
FIG. 2 is an operation timing chart for explaining the operation of the signal transmission device of FIG.
【０００８】図１において、１はＣＰＵ等の制御部で、
２は制御部１の制御信号を受けダイヤリングトーン等の
信号を出力する信号発生部である。３は信号発生部２か
らの入力波形を増幅するとともにインピーダンス整合を
行う出力回路で、例えばオペアンプ等で構成される。４
は出力回路３の電源のＯＮ，ＯＦＦを制御する電源制御
信号である。In FIG. 1, reference numeral 1 denotes a control unit such as a CPU.
Reference numeral 2 denotes a signal generator that receives a control signal from the controller 1 and outputs a signal such as a dial tone. An output circuit 3 amplifies an input waveform from the signal generation unit 2 and performs impedance matching, and is configured by, for example, an operational amplifier. 4
Is a power control signal for controlling ON / OFF of the power of the output circuit 3.
【０００９】信号発生部２の信号の送出開始および送出
停止タイミングは図２の波形ａのようにパワーダウン信
号で制御される。すなわち、波形ａがＨレベルの時、信
号発生部２はパワーダウン状態で信号を送出しない。一
方、波形ａがＬレベルの時、信号発生部２はパワーオン
状態で信号を送出する。なお信号発生部２がパワーオン
状態で信号を送出する場合、ＶDDとＧＮＤのおよそ中間
レベルまで出力レベルをもちあげる。次に作用につい
て、図２を参照して詳細に説明する。The transmission start and transmission stop timings of the signal of the signal generator 2 are controlled by a power down signal as shown by a waveform a in FIG. That is, when the waveform a is at the H level, the signal generator 2 does not transmit a signal in the power down state. On the other hand, when the waveform a is at the L level, the signal generator 2 transmits a signal in a power-on state. When the signal generator 2 sends out a signal in the power-on state, the output level is raised to an intermediate level between VDD and GND. Next, the operation will be described in detail with reference to FIG.
【００１０】信号発生部２が信号を送出開始するまでの
時間Ｔ1 では、パワーダウン信号ａがＨレベルで信号発
生部２はパワーダウン状態のため出力回路３も出力動作
を行わない。そこで制御部１は、出力回路３の電源制御
信号４をＬレベルにし出力回路３の電源をＯＦＦする。At a time T1 until the signal generator 2 starts transmitting a signal, the power down signal a is at the H level and the signal generator 2 is in a power down state, so that the output circuit 3 does not perform an output operation. Therefore, the control unit 1 sets the power control signal 4 of the output circuit 3 to L level and turns off the power of the output circuit 3.
【００１１】信号発生部２に信号送出を開始させたい時
Ｔ2 でパワーダウン信号ａをＨレベルからＬレベルに変
化させ、信号発生部２のパワーダウンを解除してやる。
この時、出力回路３の電源制御信号４は依然としてＬレ
ベルのために出力回路３の電源はＯＦＦであり、出力回
路３の出力状態は変化しない。すなわち、出力回路３は
信号発生部２からのＧＮＤとＶDDの中間レベルに急激に
変化する波形を入力するが、これを微分増幅した波形を
出力しないのでヒゲをマスクしたこととなる。When it is desired to cause the signal generator 2 to start transmitting a signal, the power down signal a is changed from H level to L level at T2, and the power down of the signal generator 2 is released.
At this time, since the power supply control signal 4 of the output circuit 3 is still at the L level, the power supply of the output circuit 3 is OFF, and the output state of the output circuit 3 does not change. That is, although the output circuit 3 receives the waveform from the signal generator 2 which rapidly changes to an intermediate level between GND and VDD, it does not output a waveform obtained by differentially amplifying the waveform, so that the mustache is masked.
【００１２】次に、信号発生部２の出力波形が安定する
時間Ｔ3 の経過後、制御部１は出力回路３の電源制御信
号４をＨにして出力回路３の電源をＯＮにする。従っ
て、信号発生部２の出力信号ｂの微分増幅した波形Ｃを
出力回路３がＴ4 時間だけ出力することとなる。出力回
路３より所望の出力波形Ｃが必要な時間Ｔ4 だけ得られ
たら、時間Ｔ5 で出力回路３の電源制御信号４をＬレベ
ルにして出力回路３の電源をＯＦＦにする。そして一定
時間Ｔ6 だけ遅延をもたせ、信号発生部２の信号送出を
停止するため、パワーダウン信号をＬレベルからＨレベ
ルに変化させる。こうすると信号発生部２はパワーダウ
ン状態となり、中間レベルからＧＮＤに急激に変化す
る。しかし、この時は出力回路３の電源はＯＦＦされて
いるので、出力回路３は信号発生部２の出力信号ｂを微
分増幅し出力することはない。このようにして、図２の
Ｃのように、従来信号発生部２の信号送出開始時と送出
停止時に発生していたヒゲの発生を防ぐことができる。Next, after a lapse of a time T3 at which the output waveform of the signal generator 2 is stabilized, the controller 1 sets the power supply control signal 4 of the output circuit 3 to H to turn on the power of the output circuit 3. Therefore, the output circuit 3 outputs the waveform C obtained by differentially amplifying the output signal b of the signal generator 2 for the time T4. When a desired output waveform C is obtained from the output circuit 3 for the required time T4, the power supply control signal 4 of the output circuit 3 is set to L level at time T5, and the power supply of the output circuit 3 is turned off. Then, the power down signal is changed from L level to H level in order to delay the signal generation section 2 by giving a delay for a certain time T6. In this case, the signal generator 2 is in a power down state, and changes from the intermediate level to GND sharply. However, at this time, since the power supply of the output circuit 3 is turned off, the output circuit 3 does not differentially amplify the output signal b of the signal generator 2 and outputs the amplified signal. In this way, as shown in FIG. 2C, it is possible to prevent the occurrence of a mustache which has been generated when the signal generator 2 starts signal transmission and stops signal transmission.
【００１３】[0013]
【発明の効果】以上のように本発明によれば、信号発生
時には信号を発生しないときの信号レベルとは異なる信
号レベルを基準とする外部機器へ伝送するための信号を
発生する信号発生部と、この信号発生部からの信号を微
分増幅して前記外部機器へ送出する出力部と、前記信号
発生部の動作を制御するとともに、前記信号発生部にお
ける信号発生開始時および信号発生終了時における前記
信号レベルの変化時を除いて前記信号発生部が動作して
いる間だけ前記出力部を動作させるように制御する制御
部とを有する。As described above, according to the present invention, when a signal is generated, a signal generator for generating a signal to be transmitted to an external device based on a signal level different from the signal level when no signal is generated is provided. An output unit for differentially amplifying the signal from the signal generation unit and sending the amplified signal to the external device, and controlling the operation of the signal generation unit, and starting the signal generation and ending the signal generation in the signal generation unit. A control unit that controls the output unit to operate only while the signal generation unit is operating except when the signal level changes.
【図１】本発明の信号伝送装置のブロック図。FIG. 1 is a block diagram of a signal transmission device according to the present invention.
【図２】［図１］の動作を説明するための図。FIG. 2 is a diagram for explaining the operation of FIG. 1;
【図３】従来の信号伝送装置のブロック図。FIG. 3 is a block diagram of a conventional signal transmission device.
【図４】［図３］の動作を説明するための図。FIG. 4 is a diagram for explaining the operation of FIG. 3;
１…制御部、２…信号発生部、３…出力回路。 1 ... Control unit, 2 ... Signal generation unit, 3 ... Output circuit.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−76932（ＪＰ，Ａ) 特開 昭61−283227（ＪＰ，Ａ) 特開 平３−249821（ＪＰ，Ａ) 実開 昭49−88611（ＪＰ，Ｕ) 実開 昭49−107217（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 1/04 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-76932 (JP, A) JP-A-61-283227 (JP, A) JP-A-3-249821 (JP, A) 88611 (JP, U) Actually open 49-107217 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H04B 1/04
Claims (1)
信号レベルとは異なる信号レベルを基準とする外部機器
へ伝送するための信号を発生する信号発生部と、この信
号発生部からの信号を微分増幅して前記外部機器へ送出
する出力部と、前記信号発生部の動作を制御するととも
に、前記信号発生部における信号発生開始時および信号
発生終了時における前記信号レベルの変化時を除いて前
記信号発生部が動作している間だけ前記出力部を動作さ
せるように制御する制御部とを有する信号伝送装置。1. A signal generating section for generating a signal to be transmitted to an external device based on a signal level different from a signal level when no signal is generated at the time of signal generation, and differentiating the signal from the signal generating section. An output unit for amplifying and sending the signal to the external device, and controlling the operation of the signal generation unit, and excluding the signal level change at the start of signal generation and at the end of signal generation in the signal generation unit. A control unit that controls the output unit to operate only while the generation unit is operating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22657392A JP2919678B2 (en) | 1992-08-26 | 1992-08-26 | Signal transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22657392A JP2919678B2 (en) | 1992-08-26 | 1992-08-26 | Signal transmission equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0677847A JPH0677847A (en) | 1994-03-18 |
| JP2919678B2 true JP2919678B2 (en) | 1999-07-12 |
Family
ID=16847288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22657392A Expired - Lifetime JP2919678B2 (en) | 1992-08-26 | 1992-08-26 | Signal transmission equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2919678B2 (en) |
-
1992
- 1992-08-26 JP JP22657392A patent/JP2919678B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0677847A (en) | 1994-03-18 |
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