JPH01133455A - Circuit for discriminating presence/absence of voice message of automatic answering telephone set - Google Patents

Circuit for discriminating presence/absence of voice message of automatic answering telephone set

Info

Publication number
JPH01133455A
JPH01133455A JP29242787A JP29242787A JPH01133455A JP H01133455 A JPH01133455 A JP H01133455A JP 29242787 A JP29242787 A JP 29242787A JP 29242787 A JP29242787 A JP 29242787A JP H01133455 A JPH01133455 A JP H01133455A
Authority
JP
Japan
Prior art keywords
circuit
signal
pulse width
pulse
period
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
JP29242787A
Other languages
Japanese (ja)
Other versions
JP2532896B2 (en
Inventor
Seiichi Omichi
大道 清一
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP62292427A priority Critical patent/JP2532896B2/en
Publication of JPH01133455A publication Critical patent/JPH01133455A/en
Application granted granted Critical
Publication of JP2532896B2 publication Critical patent/JP2532896B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To surely discriminate a sound signal and busy tone from each other, by converting input signals sent through a telephone line into pulse signals and comparing the voice existing time and no-voice existing time of the period of the pulse signals. CONSTITUTION:Signals sent through a telephone line are converted into pulse signals by means of a pulse converting circuit 7 and the pulse width T1 of a no-pulse existing part is measured at a period measuring circuit 8 and, at the same time, another pulse width T2 is calculated by multiplying the pulse width T of one period by 0.35 at an arithmetic circuit 9. The pulse widths T1 and T2 are compared with each other at a comparator circuit 10. In this case, signals are outputted from the comparator circuit 10 at every prescribed time and a timer circuit 11 is reset because T2>T1 while sound signals are transmitted. On the other hand, no signal is outputted from the comparator circuit 10 and the timer circuit 11 is set and, as a result, the sound state is cancelled, since the periods T1 and T2 become T1>T2 when a business message is conveyed and busy tones are transmitted.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は留守番電話装置の用件メツセージ録音状態にお
いて起動し用件メツセージの有無を識別する音声有無識
別回路に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a voice presence/absence identification circuit which is activated when an answering machine is recording a message and identifies the presence or absence of a message.

(ロ)従来の技術 留守番電話装置は発呼者に対し応答メツセージを送信し
、該応答メツセージ送信後該発呼者より送信きれてくる
用件メツセージの録音が行なえる状態に切換わり、発呼
者よりの用件メツセージの録音が終了すると次の発呼者
よりの着信を待つ待機状態になるという動作を行なう。
(b) Conventional technology The answering machine sends a response message to the caller, and after sending the response message, it switches to a state in which it can record the business message that the caller has sent, and then makes the call. When the recording of the message from the caller is completed, the caller enters a standby state waiting for the next caller to arrive.

一般に前記動作において応答メツセージ送信後用件メツ
セージの録音状態に切換わる動作は、該応答メツセージ
の送信が終わると同時に自動的に切換わるが用件メツセ
ージ録音状態になった後は、用件メツセージが送信きれ
て来ているかどうかを音声有無識別回路にて識別させ、
該用件メツセージの送信が無いことを識別した後、一定
時間(用件メツセージ中の無音と用件メツセージの送信
が終了して音声が無くなったのとを区別するための時間
)が経過すると前記用件メツセージの録音状態が解除さ
れるようにしている。上記のように音声有無識別回路を
用いて用件メツセージの録音状態の解除が行なわれるよ
うにした技術は例えば、特公昭61−21026号公報
に開示きれている。
Generally, in the above-mentioned operation, the operation of switching to the recording state of the business message after sending the response message is automatically switched as soon as the transmission of the response message is finished, but after the state of recording the business message is entered, the state of recording the business message is changed automatically. The audio presence/absence identification circuit identifies whether or not the transmission has been completed.
After identifying that the business message has not been transmitted, when a certain period of time (time to distinguish between silence during the business message and no sound after the transmission of the business message has been completed) has elapsed, the above-mentioned The recording state of the message is canceled. A technique for canceling the recording state of a business message using the voice presence/absence identification circuit as described above is disclosed, for example, in Japanese Patent Publication No. 61-21026.

(ハ)発明が解決しようとする問題点 上記したような留守番電話装置に設けている音声有無識
別回路は、一般に用件メツセージ録音状態において可聴
信号の有無を識別すると共に、該可聴信号が用件メツセ
ージとしての音声信号であるか、斯かる状態で発呼者の
終話に対して交換機より電話回線を介して送信されてく
るダイヤルトーン(発信音)であるのかを識別するのを
目的としている。斯かる識別方法はまず第3図のaのよ
うな可聴信号としての入力信号が加わって来ると、該入
力信号の1つ々の信号部と該信号部に続く無信号部とを
第3図のbのように1周期のパルス信号に順次変換し、
該入力信号の信号部に対応するパルス信号のパルス幅、
例えば第3図のbでのLレベルのパルス幅の検出を行な
い、該パルス幅がダイヤルトーンにはなく、音声信号の
場合のミハルス変換した時に生ずる特定のパルス幅(1
5ms〜65m5)に一致した時には入力信号が音声信
号であると識別し、それ以外の入力信号の場合はダイヤ
ルトーンと識別するようにし、さらに無音に対しては入
力信号が加わってこないことにより無音であると識別す
るようにしていた。しかし、上述したような識別方法の
場合、送信されて来ている用件メツセージの音声信号の
中に必らず特定のパルス幅に一致する信号があるとは限
らず、又、音声信号の検出を行なった後一定時間が経過
するまでに該パルス幅に一致する信号が検出出来ないと
留守番電話装置の用件メツセージ録音状態は用件メツセ
ージの録音を行なっている途中ででも解除されてしまう
という問題があった。本発明は斯かる問題を解決し、用
件メツセージ録音状態において送出されてくる音声信号
とダイヤルトーン及び無音の識別が行なえる方法にて確
実なる識別動作が行なえるようにした留守番電話装置の
音声有無識別回路を提供するものである。
(C) Problems to be Solved by the Invention The voice presence/absence identification circuit provided in the above-mentioned answering machine generally identifies the presence or absence of an audible signal in the state of recording a message, and also identifies whether the audible signal The purpose is to identify whether it is a voice signal as a message or a dial tone transmitted via the telephone line from the exchange when the caller ends the call in such a state. . Such an identification method first involves inputting an input signal in the form of an audible signal such as a in FIG. Convert sequentially to a one-period pulse signal as shown in b,
a pulse width of a pulse signal corresponding to the signal part of the input signal;
For example, by detecting the pulse width of the L level at b in Fig. 3, the pulse width is not found in the dial tone, but is a specific pulse width (1
5ms to 65m5), the input signal is identified as a voice signal, and any other input signal is identified as a dial tone, and when there is no sound, there is no sound because no input signal is added. I tried to identify it as. However, in the case of the above-mentioned identification method, there is not always a signal that matches a specific pulse width among the audio signals of the business message being transmitted, and the detection of the audio signal is not guaranteed. If a signal matching the pulse width cannot be detected within a certain period of time after the answering machine has done this, the message recording state of the answering machine will be canceled even while the message is being recorded. There was a problem. The present invention solves such problems and enables reliable identification by a method that allows for the discrimination between voice signals, dial tones, and silence sent when a message is being recorded. This provides a presence/absence identification circuit.

(ニ)問題点を解決するための手段 本発明の音声有無識別回路は、留守番電話装置が用件メ
ツセージ録音状態になっている時、電話回線を介し加わ
る信号の整流動作を行なう整流回路と該整流回路で整流
された信号を該信号の信号部と無信号部のそれぞれの幅
に対応するパルス幅にて形成されるパルス信号に変換す
るパルス変換回路と、該パルス変換回路より出力される
パルス信号の1周期のパルス幅Tを測定すると共に前記
無信号部分に対応するパルス幅T、の測定を行なう周期
測定回路と該周期測定回路より出力されるパルス幅Tが
用件メツセージとしての音声信号に対応する1周期のパ
ルス幅とした場合での無信号部の最大パルス幅T、を算
出する演算回路と、前記周期測定回路より出力されたパ
ルス幅T□と前記演算回路より算出されたパルス幅T、
との比較を行ないパルス幅T8がパルス幅T、より小さ
い値の時のみ出力信号を出すようにした比較回路と、該
比較回路よりの出力を受けるたびにリセットされ、該出
力が加わらない状態が一定時間続くと前記留守番電話装
置の用件メツセージ録音状態を停止させる信号を出力す
るタイマー回路とより構成した。
(d) Means for Solving the Problems The voice presence/absence identification circuit of the present invention is comprised of a rectifier circuit that rectifies the signal applied via the telephone line when the answering machine is in the message recording state. a pulse conversion circuit that converts a signal rectified by a rectification circuit into a pulse signal formed with a pulse width corresponding to the width of a signal portion and a non-signal portion of the signal; and a pulse output from the pulse conversion circuit. A period measuring circuit that measures the pulse width T of one period of the signal and also measures the pulse width T corresponding to the no-signal portion, and the pulse width T output from the period measuring circuit is an audio signal as a message. an arithmetic circuit that calculates the maximum pulse width T of the no-signal portion when the pulse width is one period corresponding to the period measurement circuit; and a pulse width T□ output from the period measuring circuit and the pulse calculated by the arithmetic circuit. Width T,
There is a comparator circuit that performs a comparison with the pulse width T8 and outputs an output signal only when the pulse width T8 is smaller than the pulse width T, and a comparator circuit that is reset every time it receives an output from the comparator circuit and that the output is not applied. The telephone answering machine includes a timer circuit which outputs a signal to stop the message recording state of the answering machine after a certain period of time has elapsed.

(*)作用 本発明の留守番電話装置の音声有無識別回路は、該留守
番電話装置が用件メツセージ録音状態になると同時に送
信されてくる入力信号を受信し、該入力信号を整流回路
及びパルス変換回路を通して、信号部と無信号部とを順
次、1周期のパルス信号に変換させ、該変換させたパル
ス信号を周期測定回路に加えて、該パルス信号の1周期
のパルス幅と、該1周期のパルス信号での前記入力信号
の無信号部に対応する部分のパルス幅とを測定させ、該
1周期のパルス幅の値を演算回路に加え、該1周期のパ
ルス信号を音声信号に対応するものと仮定し該音声信号
の無信号部に対応する部分のパルス幅の最高値を算出し
、該算出した値と、前記周期測定回路で測定した値とを
比較回路に加えて比較させ、算出した値より測定した値
が小さい時には出力をタイマー回路に加え、前記用件メ
ツセージ録音動作と同時に動作を開始したタイマー回路
のリセットを行なうようにしたものである。
(*) Function The voice presence/absence identification circuit of the answering machine of the present invention receives an input signal transmitted at the same time that the answering machine enters the message recording state, and converts the input signal into a rectifying circuit and a pulse converting circuit. , the signal part and the non-signal part are sequentially converted into a one-period pulse signal, and the converted pulse signal is added to a period measuring circuit to measure the one-period pulse width of the pulse signal and the one-period pulse signal. The pulse width of a portion of the pulse signal corresponding to the no-signal portion of the input signal is measured, the value of the pulse width of the one period is added to an arithmetic circuit, and the pulse signal of the one period corresponds to the audio signal. Assuming that, the highest value of the pulse width of the part corresponding to the no-signal part of the audio signal was calculated, and the calculated value and the value measured by the period measuring circuit were added to a comparison circuit and compared. When the measured value is smaller than the measured value, an output is applied to the timer circuit, and the timer circuit, which started operating at the same time as the above-mentioned message recording operation, is reset.

(へ)実施例 本発明の留守番電話装置の音声有無識別回路の一実施例
を第1図、第2図を用いて説明する。
(F) Embodiment An embodiment of the voice presence/absence identification circuit of the answering machine of the present invention will be described with reference to FIGS. 1 and 2.

(1)は電話回線に接続する接続端子、(2)は該接続
端子(1)を介し電話回線に接続させている留守番電話
装置、(3〉は該留守番電話装置(2)が用件メツセー
ジ録音状態に切換わった時、該留守番電話装e(2)よ
りの出力信号を受けて動作状態になり、クロック信号の
発生を開始し、後記するタイマー回路を起動させるクロ
ック発生回路、(4)は本発明の一実施例である音声有
無識別回路で前記留守番電話装置(2)が応答メツセー
ジの送出後、用件メツセージ録音状態に切換わるのに対
応して、動作状態になり、斯かる状態で、電話回線に加
わっている音声信号があるかないかを識別している。
(1) is a connection terminal connected to a telephone line, (2) is an answering machine connected to the telephone line via the connection terminal (1), and (3) is an answering machine connected to the telephone line through the connection terminal (1). A clock generation circuit (4) which, when switched to the recording state, receives an output signal from the answering machine e(2) and enters the operating state, starts generating a clock signal, and activates a timer circuit to be described later. is a voice presence/absence identification circuit which is an embodiment of the present invention, and is activated in response to the answering machine (2) switching to a message recording state after sending a response message, and is in such a state. It identifies whether there is a voice signal connected to the telephone line.

該音声有無識別回路(4〉において、(5)は前記留守
番電話装置(2)が用件メツセージ録音状態に切換わる
と出される出力を受け、閉結状態になるスイッチ回路で
、該スイッチ回路(5)が閉結すると該音声有無識別回
路り)は電話回線に接続きれた状態になる。(6)は該
スイッチ回路(5)を介し、電話回線に加わる入力信号
の全波整流動作をする全波整流回路、(7)は該全波整
流回路(6)の出力信号を受け、該出力信号の信号部と
無信号部とで1周期を構成するパルス信号に変換するパ
ルス変換回路で第2図の(B)のようなパルス信号を順
次形成する。本実施例では、信号部の始まりを立下げ、
信号部の終り(無信号部の始め)を立上げ、無信号部の
終りを立下げるようにして1周期のパルス信号を形成き
せている。(8)は前記パルス変換回路(7)から出さ
れるパルス信号を受け、該パルス信号の1周期のパルス
幅Tと該信号の立上がりから、立下がりまでのパルス幅
T+とを測定する周期測定回路で該測定したパルス幅T
に対する値を第1端子(8a〉より出し、パルス幅T、
に対する値を第2端子(8b)より出力させるようにし
ている。(9)は演算回路で前記周期測定回路(8)に
て測定され、第1端子(8a)より出力されるパルス幅
Tに対する値を受け、該パルス幅Tを有する音声信号の
立上がりから立下がりまでのパルス幅T、をT、−’l
’X0.35   ・・・・・・・・・(1)の式にお
いて理想値として算出する。該(1)式の定数0.35
は、例えばダイヤルトーン(終話後変換機より送られて
くる可聴信号)に対するパルス幅Tとパルス幅T、の比
率は40%以上で、それ以下はダイヤルトーンにはない
ということと斯かる状態の電話回線にはダイヤルトーン
と音声信号の二つの可聴信号しか加わらず、一般に音声
信号のパルス幅Tとパルス幅T+の比率は35%以下ぐ
らいのものがほとんどであるために設定した値でパルス
幅工、は、入力信号が音声信号として識別できる範囲の
上限値としている。(10)は該演算回路(9)で算出
されたパルス幅T、の値と、前記周期測定回路(8)の
第2端子(8b)より出力された入力信号を測定したパ
ルス幅T、の値とを受け、該パルス幅T、に対しパルス
幅T+が小さいかどうか比較し、パルス幅Ta>パルス
幅T、の条件に合っている時には出力信号を出して入力
信号が音声信号であると識別する比較回路、(11)は
タイマー回路で前記留守番電話装置(2)が用件メツセ
ージ録音状態になって、クロック発生回路(3)よりの
クロック信号を受けると動作を開始し、一定時間(例え
ば15秒)が経過すると前記留守番電話装置(2)に対
し制御信号を出すようにしていると共に、前記比較回路
(10)の出力信号を一定時間中に受けると、リセット
状態になり、リセット時より再び、上記のように一定時
間の経過を待つ状態となる。
In the voice presence/absence identification circuit (4>), (5) is a switch circuit that receives an output when the answering machine (2) switches to a message recording state and enters a closed state; When 5) is closed, the voice presence/absence identification circuit 5) becomes connected to the telephone line. (6) is a full-wave rectifier circuit that performs full-wave rectification of the input signal applied to the telephone line via the switch circuit (5); (7) is a full-wave rectifier circuit that receives the output signal of the full-wave rectifier circuit (6); A pulse signal as shown in FIG. 2(B) is sequentially formed by a pulse conversion circuit that converts the signal portion and non-signal portion of the output signal into a pulse signal that constitutes one period. In this example, the beginning of the signal section is lowered,
A one-cycle pulse signal is formed by raising the end of the signal portion (beginning of the no-signal portion) and lowering the end of the no-signal portion. (8) is a period measuring circuit which receives the pulse signal output from the pulse conversion circuit (7) and measures the pulse width T of one period of the pulse signal and the pulse width T+ from the rising edge to the falling edge of the signal. The pulse width T measured at
The value for is output from the first terminal (8a>), and the pulse width T,
The value for is outputted from the second terminal (8b). (9) is an arithmetic circuit which receives the value for the pulse width T measured by the period measuring circuit (8) and output from the first terminal (8a), and receives the value from the rise to the fall of the audio signal having the pulse width T. The pulse width T, up to T, −'l
'X0.35 Calculated as an ideal value in the formula (1). The constant of equation (1) is 0.35
For example, the ratio of the pulse width T to the pulse width T to the dial tone (audible signal sent from the converter after the end of a call) is 40% or more, and there is no dial tone below that. Only two audible signals, a dial tone and a voice signal, are applied to a telephone line, and the ratio of the pulse width T and pulse width T+ of the voice signal is generally less than 35%, so the pulse width is set to the set value. The width is defined as the upper limit of the range in which the input signal can be identified as an audio signal. (10) is the value of the pulse width T calculated by the arithmetic circuit (9) and the pulse width T measured from the input signal output from the second terminal (8b) of the period measuring circuit (8). value, and compares whether the pulse width T+ is smaller than the pulse width T, and if the condition of pulse width Ta>pulse width T is met, outputs a signal and determines that the input signal is an audio signal. The identifying comparison circuit (11) is a timer circuit that starts operating when the answering machine (2) enters the message recording state and receives a clock signal from the clock generation circuit (3). For example, when a period of 15 seconds has elapsed, a control signal is issued to the answering machine (2), and if the output signal of the comparator circuit (10) is received within a certain period of time, it enters a reset state, and when reset Then, the system returns to the state where it waits for a certain period of time to elapse as described above.

以上の構成による本発明の一実施例の音声有無識別回路
の動作を次に説明する。
The operation of the audio presence/absence identification circuit according to one embodiment of the present invention having the above configuration will be described next.

留守番電話装置(2)が電話回線を介し発呼者に応答メ
ツセージを送出し終わり、用件メツセージ録音状態に切
換わったとすると、斯かる状態において該留守番電話装
置(2)が出した出力により、クロック発生回路(3)
が起動しタイマー回路(11)に対しクロック信号の供
給を開始し、タイマー回路(11)はその供給により動
作を開始する。一方斯かる動作と同時にスイッチ回路(
5)も前記留守番電話装置(2)よりの出力を受け、閉
結状態となり、電話回線に加わる入力信号が音声有無識
別回路(りに加わり、識別される状態が形成される。斯
かる状態において、留守番電話装置(2〉に対し発呼者
より用件メツセージが電話回線を介して送信されて来て
いるとすると、該用件メツセージは留守番電話装置(2
)に加わって録音されていると共に、閉結状態のスイッ
チ回路(5)を介し、余波整流回路(6)に加わって余
波整流され、出力されてパルス変換回路(7)に加わり
、第2図の(B)のように音声信号の信号部と無信号部
とを1周期とするパルス信号に順次変換されて周期測定
回路(8)に加わる。該周期測定回路り8)では入力さ
れたパルス信号の1周期毎の立下がりから次の立下がり
までの1周期のパルス幅Tと立上がりから立下がりまで
の前記音声信号での無信号部に対応した部分のパルス幅
r1の測定を行なう、該周期測定回路(8)で測定され
たパルス幅Tは第1端子(8a)を介して演算回路(9
)に加えられ、該演算回路(9)にて、1周期のパルス
幅Tに対する理想の立上がりから立下がりまでのパルス
幅T、をT*−TXo、3Bの(1)式に従って求め、
比較回路(10)に加える。一方前記周期測定回路(8
)で測定されたパルス幅Itは第2端子(8b)より比
較回路(10)に加えられており、斯かる状態において
比較回路(10)ではパルス幅工。
Assuming that the answering machine (2) finishes sending a response message to the caller via the telephone line and switches to the message recording state, the output issued by the answering machine (2) in such a state will result in the following: Clock generation circuit (3)
is started and starts supplying a clock signal to the timer circuit (11), and the timer circuit (11) starts operating due to the supply. On the other hand, at the same time as this operation, the switch circuit (
5) also receives the output from the answering machine (2) and enters the closed state, and the input signal applied to the telephone line is applied to the voice presence/absence identification circuit (ri), forming a state in which it is recognized. In such a state, , a message is sent to the answering machine (2) from the caller via the telephone line, and the message is sent to the answering machine (2).
) is added to the pulse converter circuit (7) to be recorded, and is also applied to the aftereffect rectifier circuit (6) through the closed switch circuit (5) to be rectified by the aftereffect rectifier circuit (6), outputted, and added to the pulse conversion circuit (7), as shown in As shown in (B), the signal portion and the non-signal portion of the audio signal are sequentially converted into pulse signals having one period, and are applied to the period measuring circuit (8). The period measurement circuit 8) corresponds to the pulse width T of one period from the falling edge of the input pulse signal to the next falling edge, and the no-signal portion of the audio signal from the rising edge to the falling edge of the input pulse signal. The pulse width T measured by the period measuring circuit (8), which measures the pulse width r1 of the portion where the
), and in the arithmetic circuit (9), the ideal pulse width T from the rise to the fall for one cycle pulse width T is determined according to the formula (1) of T*-TXo, 3B,
Add to the comparison circuit (10). On the other hand, the period measuring circuit (8
) is applied to the comparator circuit (10) from the second terminal (8b), and in this state, the pulse width It is measured in the comparator circuit (10).

とパルス幅T、との比較を行なう。斯かる状態で電話回
線を介し加わっているのは発呼者よりの用件メツセージ
、いわゆる音声信号であるため、該比較回路(10)に
加わった両パルス幅はパルス幅T!〉パルス幅TIと判
別きれ、該比較回路(10)はタイマー回路(11)に
対し出力信号を出しタイマー回路(11)のリセットを
行なう、よって音声信号が電話回線を介し送信されてい
る間は上記のような動作が行なわれ、該比較回路(10
)より出力信号が数秒毎(識別動作時間ごと)に出きれ
、タイマー回路(11)のリセットを順次行ないタイマ
ー回路(11)が一定時間継続してカウント動作しない
ようにしている。
A comparison is made between the pulse width T and the pulse width T. In such a state, what is being applied via the telephone line is a message from the caller, a so-called voice signal, so the width of both pulses applied to the comparison circuit (10) is equal to the pulse width T! >The comparison circuit (10) outputs an output signal to the timer circuit (11) and resets the timer circuit (11). Therefore, while the voice signal is being transmitted via the telephone line, The above operation is performed, and the comparison circuit (10
), the output signal is output every few seconds (every identification operation time), and the timer circuit (11) is reset in sequence to prevent the timer circuit (11) from continuously counting for a certain period of time.

斯かる状態で無音、いわゆる音声信号が送信されない状
態になると、音声有無識別回路り)は何ら、信号を受け
ないため、比較回路(10)よりタイマー回路(11)
に出力信号が出きれなくなり、該タイマー回路(11)
はリセット動作されず無音状態が一定時間以上続くと、
該タイマー回路(11)はカウントアツプし、該留守番
電話装置(2)に対し制御信号を加え、該留守番電話装
置(2)の用件メツセージ録音状態の解除をさせて次の
着信を待つ応答待機状態にさせる。しかし、用件メツセ
ージ途中の無音は数秒間の間だけ、音声信号が送信され
ないだけで数秒後には再び音声信号が送信されるため、
該再び送信されて来る音声信号を識別し比較回路(10
)より出力される出力信号によりタイマー回路(11)
がリセットされるまでに該タイマー回路(11)のカウ
ント動作が一定時間継続して行なわれ、カウントアツプ
しない範囲の値に、タイマー回路(11)の=定時間は
設定しであるため、用件メツセージ途中の無音と、音声
信号が一定時間以上送信されない無音状態とは区別する
ようにしている。
In such a state, when there is no sound, so-called a state where no audio signal is transmitted, the audio presence/absence identification circuit does not receive any signal, so the timer circuit (11) is selected from the comparison circuit (10).
The output signal cannot be output to the timer circuit (11).
is not reset and remains silent for a certain period of time,
The timer circuit (11) counts up, applies a control signal to the answering machine (2), causes the answering machine (2) to release the message recording state, and waits for the next incoming call. make the state However, when there is silence during a business message, the audio signal is not sent for only a few seconds, but the audio signal is sent again a few seconds later.
A comparison circuit (10) identifies and compares the audio signal that is transmitted again.
) The timer circuit (11) is activated by the output signal output from the
The counting operation of the timer circuit (11) continues for a certain period of time before the timer circuit (11) is reset, and the constant time of the timer circuit (11) must be set to a value within a range that does not count up. A distinction is made between silence during a message and a silent state in which no audio signal is transmitted for a certain period of time.

次に上記のように留守番電話装置(2)が用件メツセー
ジ録音状態で音声有無識別回路(4)が識別可能状態に
ある時、発呼者よりの用件メツセージの送信が終わり、
電話回線を介し音声信号に変わってダイヤルトーンが送
信されて来ると、該ダイヤルトーンは音声信号と同様ス
イッチ回路(5)−余波整流回路(6)−パルス変換回
路(7)を介しパルス信号に変換され、周期測定回路(
8)で該ダイヤルトーンに対するパルス信号の1周期の
パルス幅Tと該パルス信号の立上がりから立下がりまで
の部分のパルス幅I、とを順次測定する。それにより該
周期測定回路(8)は測定したダイヤルトーンに対する
パルス信号のパルス幅Tを第1端子(8a)を介し演算
回路(9)に加えて、該パルス幅Tより、音声信号に対
するパルス信号の理想の立上がりから立下がりまでのパ
ルス幅T、をT*−’rxo。
Next, as mentioned above, when the answering machine (2) is in the state of recording the message and the voice presence/absence identification circuit (4) is in the state of being able to identify it, the transmission of the message from the caller is completed;
When a dial tone is transmitted instead of a voice signal via a telephone line, the dial tone is converted into a pulse signal through a switch circuit (5) - an aftereffect rectifier circuit (6) - a pulse conversion circuit (7), just like the voice signal. converted and the period measurement circuit (
In 8), the pulse width T of one cycle of the pulse signal for the dial tone and the pulse width I of the portion from the rise to the fall of the pulse signal are sequentially measured. Thereby, the period measuring circuit (8) applies the pulse width T of the pulse signal corresponding to the measured dial tone to the arithmetic circuit (9) via the first terminal (8a), and uses the pulse width T to generate a pulse signal corresponding to the voice signal. The ideal pulse width T from the rise to the fall of is T*-'rxo.

35の(1)式により求め、該パルス幅T、の値を比較
回路(10)に加える。一方前記周期測定回路(8〉で
測定されたパルス幅T、は比較回路(10)に第2端子
(8b)より加えられており、前記パルス幅T、とパル
ス幅TIとの比較動作が比較回路(10)にて行なわれ
る。斯かる状態において、電話回線を介し送信されてい
る信号はダイヤルトーンであり、該ダイヤルトーンは1
周期のパルス幅に対し、立上がりから立下がりまでのパ
ルス幅は40%以上と一般に規定されているため、比較
回路(10)では前記計算されたパルス幅T、は測定し
たパルス幅T1より小さいという判断が行なわれ、該比
較回路(10)は比較動作による出力信号をタイマー回
路(11)に対し加えない。そのためタイマー回路(1
1)に対するリセット動作が行なわれず、該タイマー回
路(11)はダイヤルトーンが電話回線を介し送信され
ている状態では継続して一定時間のカウント動作が行な
われ、斯かる動作により、該タイマー回路(11)はカ
ウントアツプして、留守番電話装置(2)に制御信号を
出す。それにより該留守番電話装置(2)は用件メツセ
ージ録音状態を解除し、次の着信に対する応答待機状態
となる。
35 (1), and the value of the pulse width T is added to the comparator circuit (10). On the other hand, the pulse width T measured by the period measuring circuit (8>) is applied to the comparison circuit (10) from the second terminal (8b), and the comparison operation between the pulse width T and the pulse width TI is compared. circuit (10). In such a situation, the signal being transmitted over the telephone line is a dial tone;
Since it is generally specified that the pulse width from rising to falling is 40% or more of the periodic pulse width, the comparator circuit (10) determines that the calculated pulse width T is smaller than the measured pulse width T1. A decision is made and the comparison circuit (10) does not apply the output signal due to the comparison operation to the timer circuit (11). Therefore, the timer circuit (1
When the reset operation for 1) is not performed and the timer circuit (11) continues to count a certain period of time while the dial tone is being transmitted via the telephone line, this operation causes the timer circuit (11) to 11) counts up and issues a control signal to the answering machine (2). As a result, the answering machine (2) releases the message recording state and enters the waiting state for responding to the next incoming call.

尚、本発明の音声有無識別回路を構成する周期測定回路
(8)、演算回路(9)、比較回路(10)を一つの、
例えば一チップマイコン等で構成することは可能である
Incidentally, the period measuring circuit (8), the arithmetic circuit (9), and the comparing circuit (10) constituting the audio presence/absence identification circuit of the present invention are combined into one
For example, it is possible to configure it with a one-chip microcomputer.

(ト)発明の効果 本発明の留守番電話装置の音声有無識別回路は、該留守
番電話装置が応答メツセージ送出後、用件メツセージ録
音状態になると同時に識別可能状態になり、斯かる状態
の電話回線を介して送信されてくる各入力信号を順次受
け、該入力信号をパルス変換回路にてパルス信号に変換
し、該パルス信号より周期測定回路は該信号の1周期の
パルス幅と前記入力信号の無信号部に対応する部分(信
号と信号の間)のパルス幅とを、変換されるパルス信号
毎に測定し、前記1周期のパルス幅を用いて該1周期の
パルス幅を測定した入力信号が用件メツセージとしての
音声信号であると仮定した場合、該信号が音声信号とし
て識別される無信号部に対応する部分のパルス幅の最大
値を演算回路で算出し、該算出によるパルス幅と前記測
定したパルス幅とを比較回路で比較し、該測定したパル
ス幅が算出したパルス幅より小さい時には入力信号が音
声信号であると識別するようにして、前記留守番電話装
置が用件メツセージ録音状態になると同時に動作状態に
なっているタイマー回路に出力信号を加え、リセット動
作させるようにしたため、用件メツセージが電話回線に
加わっている間は、該用件メツセージの音声信号の識別
動作が確実に行なわれ、該識別動作により前記タイマー
回路は順次リセット状態になり、前記留守番電話装置の
用件メツセージ録音状態の継続保持が行なえるようにな
った。
(G) Effects of the Invention The voice presence/absence identification circuit of the answering machine of the present invention enters the identification state at the same time as the answering machine enters the message recording state after sending a response message, and can detect the telephone line in such a state. The input signal is sequentially received through the input signal, and the input signal is converted into a pulse signal by a pulse conversion circuit. From the pulse signal, the period measuring circuit calculates the pulse width of one period of the signal and the absence of the input signal. The pulse width of the part corresponding to the signal part (between the signals) is measured for each pulse signal to be converted, and the input signal whose pulse width of the one period is measured using the pulse width of the one period is Assuming that the signal is an audio signal as a business message, an arithmetic circuit calculates the maximum value of the pulse width of a portion corresponding to a no-signal portion that is identified as an audio signal, and the calculated pulse width and the above-mentioned pulse width are calculated. The comparison circuit compares the measured pulse width with the calculated pulse width, and when the measured pulse width is smaller than the calculated pulse width, the input signal is identified as a voice signal, and the answering machine enters a message recording state. At the same time, an output signal is applied to the activated timer circuit to reset it, so that while the message is connected to the telephone line, the voice signal of the message can be reliably identified. As a result of the identification operation, the timer circuits are sequentially reset, and the message recording state of the answering machine can be maintained continuously.

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

第1図は本発明の留守番電話装置の音声有無識別回路の
一実施例を示す構成図、第2図の(A)。 (B)及び第3図の(a) 、 (b)は電話回線を介
し加わる入力信号と該入力信号に対応し変換されたパル
ス信号の波形図である。 主な図番の説明 (4)・・・音声有無識別回路、 (7)・・・パルス
変換回路、 (8)・・・周期測定回路、 (9)・・
・演算回路、(10)・・・比較回路、 (11)・・
・タイマー回路。
FIG. 1 is a block diagram showing an embodiment of a voice presence/absence identification circuit of an answering machine according to the present invention, and FIG. 2 (A). (B) and (a) and (b) of FIG. 3 are waveform diagrams of an input signal applied via a telephone line and a pulse signal converted corresponding to the input signal. Explanation of main drawing numbers (4)...Audio presence/absence identification circuit, (7)...Pulse conversion circuit, (8)...Period measurement circuit, (9)...
・Arithmetic circuit, (10)... Comparison circuit, (11)...
・Timer circuit.

Claims (1)

【特許請求の範囲】[Claims] (1)発呼者よりの着信に対して該発呼者への応答メッ
セージを電話回線を介し送出し、該応答メッセージ送出
後発呼者より該電話回線を介して送信されてくる用件メ
ッセージの録音動作を行なう留守番電話装置において、
該用件メッセージの録音動作状態に前記電話回線に加わ
る信号の整流動作を行なう整流回路と、該整流回路で整
流された信号を該信号の信号部と無信号部のそれぞれの
幅に対応するパルス幅にて形成されるパルス信号に変換
するパルス変換回路と、該パルス変換回路より出力され
るパルス信号の1周期のパルス幅Tを測定すると共に前
記無信号部分に対応するパルス幅T_1の測定を行なう
周期測定回路と該周期測定回路より出力されるパルス幅
Tが用件メッセージとしての音声信号に対応する1周期
のパルス幅とした場合での無信号部の最大パルス幅T_
2を算出する演算回路と、前記周期測定回路より出力さ
れたパルス幅T_1と前記演算回路より算出されたパル
ス幅T_2との比較を行ない、パルス幅T_1がパルス
幅T_2より小さい値の時のみ出力信号を出すようにし
た比較回路と、該比較回路よりの出力を受けるたびにリ
セットされ、該出力が加わらない状態が一定時間続くと
前記留守番電話装置の用件メッセージ録音動作状態を停
止させる信号を出力するタイマー回路とにより構成した
ことを特徴とする留守番電話装置の音声有無識別回路。
(1) In response to an incoming call from a caller, a response message is sent to the caller via the telephone line, and after the response message is sent, a business message sent from the caller via the telephone line is sent. In answering machines that perform recording operations,
a rectifier circuit that rectifies the signal applied to the telephone line when the business message is being recorded; and a rectifier circuit that rectifies the signal that is applied to the telephone line when the business message is being recorded; a pulse conversion circuit that converts the pulse signal into a pulse signal formed by the pulse width, and measures the pulse width T of one period of the pulse signal output from the pulse conversion circuit, and also measures the pulse width T_1 corresponding to the no-signal portion. Maximum pulse width T_ of the no-signal part when the period measuring circuit to be measured and the pulse width T output from the period measuring circuit are one period pulse width corresponding to the voice signal as the business message.
The arithmetic circuit that calculates 2 compares the pulse width T_1 output from the period measuring circuit with the pulse width T_2 calculated by the arithmetic circuit, and outputs only when the pulse width T_1 is smaller than the pulse width T_2. A comparison circuit that outputs a signal, and a signal that is reset each time it receives an output from the comparison circuit and that stops the message recording operation state of the answering machine when the output is not applied for a certain period of time. 1. A voice presence/absence identification circuit for an answering machine, comprising a timer circuit that outputs an output.
JP62292427A 1987-11-19 1987-11-19 Voice presence / absence discrimination circuit for answering machine Expired - Lifetime JP2532896B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62292427A JP2532896B2 (en) 1987-11-19 1987-11-19 Voice presence / absence discrimination circuit for answering machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62292427A JP2532896B2 (en) 1987-11-19 1987-11-19 Voice presence / absence discrimination circuit for answering machine

Publications (2)

Publication Number Publication Date
JPH01133455A true JPH01133455A (en) 1989-05-25
JP2532896B2 JP2532896B2 (en) 1996-09-11

Family

ID=17781648

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62292427A Expired - Lifetime JP2532896B2 (en) 1987-11-19 1987-11-19 Voice presence / absence discrimination circuit for answering machine

Country Status (1)

Country Link
JP (1) JP2532896B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008309A1 (en) * 1990-11-02 1992-05-14 Anthony Ben Dibianca Telephone calling apparatus and method
US5724420A (en) * 1994-09-28 1998-03-03 Rockwell International Corporation Automatic call distribution with answer machine detection apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008309A1 (en) * 1990-11-02 1992-05-14 Anthony Ben Dibianca Telephone calling apparatus and method
US5724420A (en) * 1994-09-28 1998-03-03 Rockwell International Corporation Automatic call distribution with answer machine detection apparatus and method

Also Published As

Publication number Publication date
JP2532896B2 (en) 1996-09-11

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