JPH04108229A - Telephone set for automobile - Google Patents
Telephone set for automobileInfo
- Publication number
- JPH04108229A JPH04108229A JP22544090A JP22544090A JPH04108229A JP H04108229 A JPH04108229 A JP H04108229A JP 22544090 A JP22544090 A JP 22544090A JP 22544090 A JP22544090 A JP 22544090A JP H04108229 A JPH04108229 A JP H04108229A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- filter
- automobile
- frequency
- window
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000010187 selection method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は自動車用電話に関し、特にハンドセットを持た
ずにハンズフリーで通話ができる自動車用電話に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a car phone, and more particularly to a car phone that allows hands-free calls without having to hold a handset.
(従来の技術)
従来、自動車用ハンズフリー電話は、例えば運転席に最
も近い車体のピラーに固定されたマイクロホンにて運転
者の音声を拾い、それを電話用送受信装置を介して通話
相手に送っている。(Prior Art) Conventionally, hands-free automobile telephones pick up the driver's voice using a microphone fixed to the pillar of the vehicle body closest to the driver's seat, and transmit it to the other party via a telephone transceiver. ing.
(発明が解決しようとする課題)
しかしながら、上記従来例では、特に車両の窓が開いて
いるときに通話を行なうと、マイクロホンが外来ノイズ
を拾い、それが通話音声と共に送信されてしまうため、
通話相手にとって送信側の音声が聞き取りにくいという
欠点がある。(Problem to be Solved by the Invention) However, in the above conventional example, when a call is made especially when the window of the vehicle is open, the microphone picks up external noise and it is transmitted along with the call voice.
The drawback is that it is difficult for the other party to hear the voice of the sender.
(課題を解決するための手段及び作用)本発明は、上述
の課題を解決することを目的として成さ゛れたもので、
上述の課題を解決する一手段として以下の構成を備える
。(Means and effects for solving the problems) The present invention was made with the aim of solving the above problems, and
The following configuration is provided as one means for solving the above-mentioned problem.
即ち、周囲の音を拾う集音手段と、通話の送受信を行な
う送受信手段と、前記集音手段と前記送受信手段との間
に設けられ、所定の周波数を遮断するフィルタと、車両
の窓の開閉状態を検知する検知手段とを備え、前記検知
手段が車両の窓が開いていることを検知したとき、前記
フィルタにて所定の周波数を遮断することができる。That is, a sound collecting means for picking up surrounding sounds, a transmitting/receiving means for transmitting and receiving calls, a filter that is provided between the sound collecting means and the transmitting/receiving means to cut off a predetermined frequency, and a filter that blocks a predetermined frequency. and a detection means for detecting a state, and when the detection means detects that a window of the vehicle is open, the filter can cut off a predetermined frequency.
(実施例)
以下、添付図面を参照して本発明に係る好適な実施例を
詳細に説明する。(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第1図は本発明に係る一実施例である自動車用電話の構
成を示すブロック図である。同図において、窓開閉検出
部lは車両の窓が開いているかを検圧し、車両の窓が閉
じているときには切替スイッチ2を図示した位置にする
ので、マイクロホン3が拾った音声はそのまま電話用ア
ダプタ6を介して電話用送受信装置7に送られる。しか
し、窓が開いている場合には、切替スイッチ2を上述と
は逆側に倒し、さらにノイズ成分分析部4に所定の信号
を送出する。その結果、マイクロホン3からの音声信号
は、低周波フィルタ5に入力されると同時に、ノイズ成
分分析部4へも入力される。FIG. 1 is a block diagram showing the configuration of a car telephone according to an embodiment of the present invention. In the figure, the window opening/closing detection unit l detects whether the vehicle window is open or not, and when the vehicle window is closed, the changeover switch 2 is set to the position shown, so that the voice picked up by the microphone 3 is directly transmitted to the telephone. The data is sent to the telephone transmitting/receiving device 7 via the adapter 6. However, when the window is open, the selector switch 2 is turned to the opposite side to the above-mentioned side, and a predetermined signal is sent to the noise component analysis section 4. As a result, the audio signal from the microphone 3 is input to the low frequency filter 5 and simultaneously input to the noise component analysis section 4.
ノイズ成分分析部4は、後述する方法にてマイクロホン
3が拾ったノイズを分析し、その結果をもとに低周波フ
ィルタ5内のフィルタ選択部5dにフィルタ選択用信号
を送8する。ノイズ成分分析部4からフィルタ選択用信
号を受けたフィルタ選択部5dは、その信号に従い、そ
れぞれ後述する周波数特性を有するフィルタa、b、あ
るいはCを選択する。The noise component analyzer 4 analyzes the noise picked up by the microphone 3 using a method described later, and sends a filter selection signal 8 to the filter selector 5d in the low frequency filter 5 based on the result. The filter selection section 5d, which receives the filter selection signal from the noise component analysis section 4, selects filters a, b, or C, each having a frequency characteristic described later, according to the signal.
第2図は、低周波フィルタ5に内蔵される3種類のフィ
ルタの周波数特性を示す。FIG. 2 shows the frequency characteristics of three types of filters built into the low frequency filter 5.
フィルタaは第2図に示す周波数特性の内、高周波数帯
域でのカットオフ周波数f、を有するフィルタであり、
その他、フィルタb、フィルタCはそれぞれカットオフ
周波数fb、fcを有する。また、各フィルタ共、低周
波数領域でのカットオフ周波数は同一である。Filter a is a filter having a cutoff frequency f in a high frequency band among the frequency characteristics shown in FIG.
Additionally, filter b and filter C have cutoff frequencies fb and fc, respectively. Further, each filter has the same cutoff frequency in the low frequency region.
ここで、ノイズ成分分析部4における外来ノイズの分析
方法について簡単に説明する。Here, a method for analyzing extraneous noise in the noise component analysis section 4 will be briefly described.
一般に、車室内に設置されたマイクロホンに到達する外
来ノイズとしては、自車及び他車のエンジンノイズ、自
軍の空調音、風切り音等があり、特に窓を開けたときは
風切り音と他車のエンジンノイズが顕著に増える。そこ
で、ノイズ成分分析部4は、マイクロホン3が拾った音
声周波数帯域′の音の中から、振幅が一定レベルを越え
て、所定時間、定常的に現われる信号成分を拾い出し、
その周波数を分析する。そして、その結果をもとにフィ
ルタ選択信号を低周波フィルタ5に送る。In general, the external noises that reach the microphone installed inside the vehicle include the engine noise of your own vehicle and other vehicles, the air conditioning sound of your own military, wind noise, etc. Especially when the windows are open, wind noise and other vehicle noise Engine noise increases noticeably. Therefore, the noise component analysis unit 4 picks out a signal component whose amplitude exceeds a certain level and appears steadily for a predetermined period of time from the sound in the audio frequency band ' picked up by the microphone 3.
Analyze its frequency. Then, based on the result, a filter selection signal is sent to the low frequency filter 5.
第3図は、本実施例の自動車用電話でのフィルタ選択手
順を示すフローチャートである。FIG. 3 is a flowchart showing the filter selection procedure in the car telephone of this embodiment.
第3図のステップS1で、窓開閉検出部1にて車両の窓
が開いているか否かを判定し、閉じていれば直ちに処理
を終える。しかし、窓が開いていればステップS2にて
切替スイッチ2を低周波フィルタ5側に倒す。そして、
続くステップS3で、ノイズ成分分析部4は上述の如く
、入力される信号の中に定常的に出現する信号が存在す
るかどうかを判断する。ここでの判断がYESであれば
、ステップS4でその周波数fを特定し、f〈fゎであ
れば、ステップS5に進んでフィルタaを選択する。ま
た、ステップS4で特定した周波数fがf←fゎであれ
ば、ステップS6にてフィルタbを選択する。同様に、
f>fゎであれば、ステップS7でフィルタCを選択す
る。In step S1 of FIG. 3, the window opening/closing detection unit 1 determines whether the vehicle window is open or not, and if it is closed, the process ends immediately. However, if the window is open, the selector switch 2 is turned to the low frequency filter 5 side in step S2. and,
In the following step S3, the noise component analysis unit 4 determines whether or not there is a signal that regularly appears among the input signals, as described above. If the determination here is YES, the frequency f is specified in step S4, and if f<fゎ, the process proceeds to step S5 and filter a is selected. Further, if the frequency f specified in step S4 is f←fゎ, filter b is selected in step S6. Similarly,
If f>fゎ, filter C is selected in step S7.
ステップS3で、定常的に現われる信号が存在しない場
合は、通話帯域をできるだけ広くとる意味で、ステップ
S7に進んでフィルタCを選択する。In step S3, if there is no signal that appears regularly, the process proceeds to step S7 and filter C is selected in order to widen the communication band as much as possible.
以上説明したように、本実施例によれば、車両の窓が開
いていることを検知して、マイクロホンに到来する外来
ノイズの周波数分析を行ない、その周波数に対応するカ
ットオフ周波数を有するフィルタを選択して通話回路に
挿入するので、窓を開けて通話しても外来ノイズが通話
相手に送出されず、相手にとって音声が聞き取り易す(
なるという効果がある。As explained above, according to this embodiment, it is detected that the window of the vehicle is open, the frequency of external noise arriving at the microphone is analyzed, and a filter having a cutoff frequency corresponding to that frequency is installed. Since it is selected and inserted into the communication circuit, external noise will not be transmitted to the other party when talking with the window open, making it easier for the other party to hear the voice (
It has the effect of becoming.
尚、上記実施例では、マイクロホンに到達するノイズの
周波数分析を行ない、フィルタを選択していだが、車速
をもとに外来ノイズを判断してフィルタを選択してもよ
い。In the above embodiment, a filter is selected by analyzing the frequency of noise reaching the microphone, but a filter may be selected by determining external noise based on the vehicle speed.
(発明の効果)
以上説明したように、本発明によれば、車両の窓が開い
ているときに、集音部が拾った外来ノイズを遮断できる
ので、通話相手にとり音声が聞き取り易くなるという効
果がある。(Effects of the Invention) As explained above, according to the present invention, when the window of the vehicle is open, external noise picked up by the sound collection unit can be blocked, so the voice can be easily heard by the other party. There is.
第1図は本発明に係る一実施例である自動車用電話の構
成を示すブロック図、
第2図は低周波フィルタに内蔵される3種類のフィルタ
の周波数特性を示す図、
第3図は実施例の自動車用電話でのフィルタ選択手順を
示すフローチャートである。
図中、1・・・窓開閉検出部、2・・・切替スイッチ、
3・・・マイクロホン、4・・・ノイズ成分分析部、5
・・・低周波フィルタ、6・・・電話用アダプタ、7・
・・電話用送受信装置である。
第3図Fig. 1 is a block diagram showing the configuration of a car phone that is an embodiment of the present invention, Fig. 2 is a diagram showing the frequency characteristics of three types of filters built into the low frequency filter, and Fig. 3 is an implementation example. 3 is a flowchart illustrating a filter selection procedure in an example car phone. In the figure, 1... Window opening/closing detection unit, 2... Changeover switch,
3...Microphone, 4...Noise component analysis section, 5
...Low frequency filter, 6...Telephone adapter, 7.
...It is a telephone transmitting and receiving device. Figure 3
Claims (1)
の周波数を遮断するフィルタと、 車両の窓の開閉状態を検知する検知手段とを備え、前記
検知手段が車両の窓が開いていることを検知したとき、
前記フィルタが所定の周波数を遮断することを特徴とす
る自動車用電話。[Scope of Claims] A sound collecting means for picking up surrounding sounds; a transmitting/receiving means for transmitting and receiving calls; a filter provided between the sound collecting means and the transmitting/receiving means to block a predetermined frequency; and a vehicle. a detection means for detecting an open/closed state of a window of the vehicle, and when the detection means detects that the window of the vehicle is open,
A car telephone characterized in that the filter blocks a predetermined frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22544090A JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22544090A JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04108229A true JPH04108229A (en) | 1992-04-09 |
JP2885906B2 JP2885906B2 (en) | 1999-04-26 |
Family
ID=16829401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22544090A Expired - Fee Related JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2885906B2 (en) |
-
1990
- 1990-08-29 JP JP22544090A patent/JP2885906B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2885906B2 (en) | 1999-04-26 |
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