JPS63191447A - Electronic telephone set - Google Patents

Abstract

PURPOSE:To send a transmission signal which has a small noise to an opposite side and to enable a clear calling between both sides by increasing the sound volume of an originating sound and a receiving sound automatically in the presence of a large noise, and removing a noise component which is mixed with the calling signal through a filter. CONSTITUTION:An ambient noise is collected by a microphone 17 and a noise detecting circuit 4 finds the noise level from the output of the microphone 17 and controls the amplification gain of an incoming circuit 1 according to the noise level. The noise detecting circuit 4 classifies the noise level by three stages of small, intermediate, and large levels and varies the normal band of a filter circuit 14 to F0, F1 and F2 in the order of the large, intermediate, and small levels. Namely, when the noise level is large, a low-frequency component is cut more to remove the noise component which is mixed with the calling voice. In general, the frequency component of the ambient noise is higher in level as the frequency is lower, so this part is cut, so that the input of a calling circuit 12 is clear even in the presence of the noise. Consequently, even when subscribers have a talk in the presence of the large ambient noise, the noise is not sent to the opposite sides as much as possible and the calling becomes clear.

Description

【発明の詳細な説明】 「産業上の利用分野］ この発明は、周辺の騒音レベルに応じて動作特性を自動
調整する電子電話機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic telephone that automatically adjusts its operating characteristics according to the surrounding noise level.

［従来の技術］ 例えば特開昭６０−１４１０５８号公報に開示されてい
るように、スピーカから発生する着信ベル音や受信音声
の音量を、周辺の騒音レベルに応じて自動的に変化させ
るように構成した電子電話機が知られている（騒音が大
きいとスピーカ音量も大きくする）。[Prior Art] For example, as disclosed in Japanese Unexamined Patent Publication No. 60-141058, the volume of the incoming bell sound and received voice generated from a speaker is automatically changed according to the surrounding noise level. Electronic telephones with this configuration are known (increasing the speaker volume when the noise is loud).

つまりこの電子電話機は、マイクロホンで周辺の騒音を
採取して騒音レベルを弁別する手段と、弁別した騒音レ
ベルに応じて上記スピーカへの信号増幅系の利得を変化
させる制御手段とを備えている。In other words, this electronic telephone is equipped with a means for collecting ambient noise with a microphone and discriminating the noise level, and a control means for changing the gain of the signal amplification system to the speaker according to the discriminated noise level.

［発明が解決しようとする問題点コ 周囲の騒音が大きいときにスピーカの音量が自動的に大
きくなれば、着信ベル音が確認しやすくなるし、通話相
手の話も聞きとりやすくなる。[Problems to be Solved by the Invention] If the volume of the speaker were automatically increased when the surrounding noise is loud, it would be easier to confirm the incoming ringtone and also hear what the other party is saying.

一方、周囲の騒音が大きいと、その騒音が送話器を通じ
て相手側に伝わり、相手側ではこぢらの話が騒音に埋も
れて聞きとりにくくなる。上述の従来の電子電話機はこ
の問題についてまったく考慮されていない。On the other hand, if the surrounding noise is loud, the noise will be transmitted through the transmitter to the other party, making it difficult for the other party to hear what is being said because it will be drowned out by the noise. The above-mentioned conventional electronic telephones do not consider this problem at all.

この発明は」ユリのような問題点を解消するためになさ
れたもので、周囲騒音が大きい環境下で通話しても、相
手側に騒音をできるだけ伝えないようにし、明瞭な送話
ができる電子電話機を得ることを目的とする。This invention was made in order to solve the problems mentioned above, and it is an electronic device that can transmit clearly even when talking in an environment with a lot of ambient noise by minimizing the noise transmitted to the other party. Aim to get a phone.

［問題点を解決するための手段］ そこでこの発明では、周囲の騒音レベルに応じて受話音
声や着信音の音量を自動的に変化させる制御系に加えて
、送話器からの音声信号をろ波するフィルタ手段の周波
数特性を騒音レベルに応じて自動的に変化させる制御系
を設けた。[Means for Solving the Problems] Therefore, in this invention, in addition to a control system that automatically changes the volume of the received voice and ringtone according to the surrounding noise level, the voice signal from the transmitter is filtered. A control system is provided to automatically change the frequency characteristics of the wave-generating filter means according to the noise level.

［作用コ 上記構成におけるフィルタ手段は、騒音レベルが低いと
きには通過帯域が広くなり、音声成分をより多く伝送し
て明瞭度を保証する。騒音レベルが高くなるとフィルタ
手段の通過帯域が狭くなり、騒音成分を除くことによっ
て明瞭度の低下を防ぐ。[Operation] The filter means in the above configuration has a wide pass band when the noise level is low, transmitting more audio components to ensure intelligibility. When the noise level increases, the pass band of the filter means becomes narrower, and by removing noise components, a decrease in clarity is prevented.

［実施例］ 第１図は本発明の一実施例による電子電話機の構成を示
している。[Embodiment] FIG. 1 shows the configuration of an electronic telephone according to an embodiment of the present invention.

図において、（１０）は線路端子（９）に接続されたハ
イブリッド回路で、網制御や２−４線変換等を行い、受
話回路（１１）及び送話回路（１２）に接続されている
。（１３）は送話器で、フィルタ回路（１４）を介して
送話回路（１２）に接続されている。（１５）は受話器
で、受話回路（１１）に接続されている。（６）はスピ
ーカで、着信回路（１６）を介して線路端子（９）に接
続されている。（１７）はマイクロホンで、これの出力
は騒音検出回路（４）に入力される。受話回路（１１）
及び着信回路（１６）の増幅利得と、フィルタ回路（１
４）の周波数特性とが騒音検出回路（４）の出力によっ
て制御される。In the figure, (10) is a hybrid circuit connected to a line terminal (9), which performs network control, 2-4 line conversion, etc., and is connected to a receiving circuit (11) and a transmitting circuit (12). (13) is a transmitter, which is connected to the transmitter circuit (12) via a filter circuit (14). (15) is a receiver connected to the receiver circuit (11). (6) is a speaker, which is connected to a line terminal (9) via an incoming circuit (16). (17) is a microphone, the output of which is input to the noise detection circuit (4). Receiving circuit (11)
and the amplification gain of the receiving circuit (16) and the filter circuit (1
4) is controlled by the output of the noise detection circuit (4).

上記の構成において、線路端子（９）に着信信号が入来
すると、着信回路（１６）から着信信号が発生し、スピ
ーカ（６）から着信ベル音が発生する。In the above configuration, when an incoming signal enters the line terminal (9), the incoming signal is generated from the incoming circuit (16) and an incoming bell sound is generated from the speaker (6).

本電話機の周辺の騒音はマイクロホン（１７）で採取さ
れ、騒音検出回路（４）はマイクロホン（１７）の出力
に基づいて騒音レベルを求め、その騒音レベルに応じて
着信回路（１６）の増幅利得を制御している。従って、
スピーカ（６）から発生する着信ベル音の音量は周囲の
騒音が大きいほど大きくなる。The noise around this phone is collected by the microphone (17), the noise detection circuit (4) determines the noise level based on the output of the microphone (17), and the amplification gain of the incoming circuit (16) is determined according to the noise level. is controlled. Therefore,
The volume of the incoming bell sound generated from the speaker (6) increases as the surrounding noise increases.

次に通話状態に入ると、送話信号は送話器（１３）から
フィルタ回路（１４）　、送話回路（１２）　、ハイブ
リッド回路（１０）を介して回線に送出される。また、
受話信号は回線よりハイブリッド回路（１０）　、受話
回路（１１）を介して受話器（１５）に至り発音される
。Next, when entering the talking state, a transmitting signal is sent from the transmitter (13) to the line via the filter circuit (14), the transmitting circuit (12), and the hybrid circuit (10). Also,
The receiving signal is transmitted from the line via the hybrid circuit (10) and the receiving circuit (11) to the telephone receiver (15), where it is generated.

受話回路（１１）の制御利得も騒音検出回路（４）によ
って制御され、騒音が大きいほど受話器（１５）の音量
が大きくなる。The control gain of the receiver circuit (11) is also controlled by the noise detection circuit (4), and the louder the noise, the louder the volume of the receiver (15) becomes.

本発明においては、フィルタ回路（１４）の周波数特性
が騒音検出回路（４）によって制御される。In the present invention, the frequency characteristics of the filter circuit (14) are controlled by the noise detection circuit (4).

本実施例では、騒音検出回路（４）は騒音レベルを小、
中、大の３段階に弁別し、フィルタ回路（１４）の通常
帯域を第２図に示すように、小レベルのときはＦｏ中レ
ベルのときはＦ１１大レベルのときはＦ２と変化させる
。In this embodiment, the noise detection circuit (4) reduces the noise level.
The normal band of the filter circuit (14) is differentiated into three stages, medium and large, and as shown in FIG. 2, when the small level is Fo, the medium level is F11, and when the large level is F2.

つまり騒音レベルが大きいときは低音成分より多くカッ
トし、送話音声に混入する騒音成分を除−４＝ 去する。一般的に、周囲騒音の周波数成分は低域はどレ
ベルが高いので、この部分をカットすることにより、送
話回路（１２）の入力は高騒音下でも明瞭なものとなる
。In other words, when the noise level is high, more low-pitched sound components are cut, and the noise components mixed into the transmitted voice are removed. Generally, the frequency components of ambient noise have a high level in the low range, so by cutting this part, the input to the transmitter circuit (12) becomes clear even under high noise conditions.

第３図は上記フィルタ回路（１４）の具体的な構成例を
示している。この例は、オペアンプ（３０）を用いた周
知のアクティブ・フィルタを基本とし、帰還抵抗網（Ｒ
１）（Ｒ２）（Ｒ３）に設けたアナログスイッチ（３１
）、（３２）を騒音検出回路（４）からの信号で制御し
、周波特性を第２図のように３段階に変化させるように
構成している。FIG. 3 shows a specific example of the configuration of the filter circuit (14). This example is based on a well-known active filter using an operational amplifier (30) and a feedback resistor network (R
1) Analog switch (31) provided on (R2) (R3)
), (32) are controlled by signals from the noise detection circuit (4), and the frequency characteristics are changed in three stages as shown in FIG.

なお、フィルタ回路（１４）の特性を騒音レベルに応じ
て段階的に代える実施例に限定されず、特性を連続的に
変化させるように構成してもよい。Note that the present invention is not limited to the embodiment in which the characteristics of the filter circuit (14) are changed stepwise according to the noise level, but may be configured to change the characteristics continuously.

［発明の効果］ 以上詳細に説明したように、この発明に係る電子電話機
にあっては、高騒音下で発信音及び受話音声の音量が自
動的に大きくなるだけでなく、送話信号に混入する騒音
成分をフィルタによって除去するように構成したので、
相手側に騒音の少ない送話信号を伝えることができ、相
互に明瞭な通話が可能となる。[Effects of the Invention] As explained in detail above, the electronic telephone according to the present invention not only automatically increases the volume of the dialing tone and the received voice under high noise conditions, but also prevents the volume of the dialing tone and the received voice from being mixed into the transmitting signal. Since the structure is configured to remove the noise components caused by the noise using a filter,
A transmission signal with less noise can be transmitted to the other party, allowing clear communication between the parties.

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

第１図は本発明の一実施例による電子電話機のブロック
図、第２図は同実施例におけるフィルタ回路の周波数特
性図、第３図は同フィルタ回路の構成例を示す回路図で
ある。 （４）は騒音検出回路、（６）はスピーカ、（１１）は
受話回路、（１２）は送話回路、（１３）は送話器、（
１４）はフィルタ回路、（１５）は受話器、（１６）は
着信回路、（３０）はオペアンプ、（３１）、（３２）
はアナログスイッチである。 なお、図中、同一符号は同一、又は相当部分を示す。 代理人　弁理士　大　岩　増　雄 （他　２名） 第１図 １ｏ：・・イブリッド回路 １１：受話回路 １２：送話回路 １３：送話器 １６：着信回路 周波数（ＫＨｚ） 手続補正書（自発） 昭和　　年　　月　　日 １、事件の表示　　　特願昭　６２−０２３１８９号２
、発明の名称 電子電話機 ３、補正をする者 代表者志岐守哉 ｆｊ） ５、補正の対象 明細書の発明の詳細な説明の欄。 ６、補正の内容FIG. 1 is a block diagram of an electronic telephone according to an embodiment of the present invention, FIG. 2 is a frequency characteristic diagram of a filter circuit in the same embodiment, and FIG. 3 is a circuit diagram showing an example of the configuration of the filter circuit. (4) is a noise detection circuit, (6) is a speaker, (11) is a receiving circuit, (12) is a transmitting circuit, (13) is a transmitter, (
14) is a filter circuit, (15) is a receiver, (16) is a receiving circuit, (30) is an operational amplifier, (31), (32)
is an analog switch. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Patent attorney Masuo Oiwa (and 2 others) Figure 1 1o: Ibrid circuit 11: Receiving circuit 12: Transmitting circuit 13: Transmitter 16: Receiving circuit frequency (KHz) Procedural amendment (voluntary) Showa month/day 1, case description patent application No. 62-023189 2
, Name of the invention Electronic telephone 3, Person making the amendment Representative Moriya Shiki fj) 5. Detailed description of the invention in the specification to be amended. 6. Contents of correction

Claims (1)

【特許請求の範囲】[Claims] （１）送話器からの音声信号をろ波するフィルタ手段と
、受話器に供給する音声信号を増幅する増幅手段と、ス
ピーカに供給する着信音信号を増幅する増幅手段と、周
辺の騒音レベルを検出する検出手段と、検出された騒音
レベルに応じて上記フィルタ手段の周波数特性及び上記
２つの増幅手段の利得を変化させる制御手段とを備えた
ことを特徴とする電子電話機。(1) Filter means for filtering the audio signal from the transmitter, amplification means for amplifying the audio signal supplied to the receiver, amplification means for amplifying the ring tone signal supplied to the speaker, and an amplification means for amplifying the ring tone signal supplied to the speaker, What is claimed is: 1. An electronic telephone set comprising: a detection means for detecting; and a control means for changing the frequency characteristics of the filter means and the gains of the two amplification means according to the detected noise level.