JPH1098344A - Voice amplifier, communication terminal equipment and voice-amplifying method - Google Patents
Voice amplifier, communication terminal equipment and voice-amplifying methodInfo
- Publication number
- JPH1098344A JPH1098344A JP8271532A JP27153296A JPH1098344A JP H1098344 A JPH1098344 A JP H1098344A JP 8271532 A JP8271532 A JP 8271532A JP 27153296 A JP27153296 A JP 27153296A JP H1098344 A JPH1098344 A JP H1098344A
- Authority
- JP
- Japan
- Prior art keywords
- maximum amplitude
- audio
- amplification
- amplifying
- amplification degree
- 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
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Abstract
Description
【０００１】[0001]
【目次】以下の順序で本発明を説明する。 発明の属する技術分野 従来の技術 発明が解決しようとする課題 課題を解決するための手段 発明の実施の形態（図１〜図４） 発明の効果[Table of Contents] The present invention will be described in the following order. Technical Field to which the Invention pertains Related Art Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 4) Effects of the Invention
【０００２】[0002]
【発明の属する技術分野】本発明は音声増幅装置及び通
信端末装置並びに音声増幅方法に関し、例えば携帯電話
装置に適用して好適なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio amplifying device, a communication terminal device, and an audio amplifying method, and is suitably applied to, for example, a portable telephone device.
【０００３】[0003]
【従来の技術】従来、移動体通信システムのうち最も普
及の著しいサービスとして携帯電話装置がある。近年の
携帯電話装置の小型化、軽量化は価格の低減効果に大き
く寄与し、加入者数の拡大を促進している。しかしなが
ら加入者数の拡大に伴い様々な問題も出現している。例
えばユーザが静かな公共の場所で通話すると話し声が周
囲に迷惑をかけてしまうおそれがあつたり、また混雑し
た電車の中で通話すると会話の内容が他人に聞かれてし
まうおそれがあるといつた問題である。このようなとき
ユーザは小さな声で通話することによつて他人に迷惑を
かけないようにしているが、小さな声の状態のままで送
信すると相手が音声を聞き取りにくいという事態が起こ
る。2. Description of the Related Art Conventionally, there is a portable telephone device as a service which is most widely spread among mobile communication systems. The reduction in size and weight of portable telephone devices in recent years has greatly contributed to the effect of reducing prices, and has promoted the expansion of the number of subscribers. However, various problems have appeared with the increase in the number of subscribers. For example, when a user talks in a quiet public place, the voice may bother others, or when talking on a crowded train, the contents of the conversation may be heard by others. It is a problem. In such a case, the user tries to avoid disturbing others by talking in a low voice, but if the user transmits the voice in a low voice state, it may be difficult for the other party to hear the voice.
【０００４】従つてこの事態を解消するため従来の携帯
電話装置では端末に切換スイツチを設けて、ユーザがこ
の切換スイツチを操作しマイクゲインを直接切り換るこ
とにより、予め決められた増幅度に変化するようになさ
れている。これにより小さな音声を増幅し、当該音声を
相手が聞き取りやすい音量にしてから送信している。Therefore, in order to solve this situation, in a conventional portable telephone device, a switching switch is provided in the terminal, and the user operates the switching switch to directly switch the microphone gain, so that a predetermined amplification degree is obtained. It has been made to change. This amplifies a small sound, and transmits the sound after setting the sound to a volume that is easy for the other party to hear.
【０００５】[0005]
【発明が解決しようとする課題】ところでかかる構成の
携帯電話装置においては、ユーザ自身が通話の状況に応
じて切換スイツチを操作し増幅度の調整をしなければな
らないが、ユーザが会話の状況に応じて切換スイツチを
操作しながら通話するということは困難なことで実際そ
のようなことはほとんど行われていない。例えばユーザ
が小さい声で通話するため切換スイツチを予め増幅度の
大きい側に設定しているとき、ユーザが相手の話を聞い
ているときのように音声が入力されていない状況になつ
たからといつて、ユーザはわざわざ切換スイツチを増幅
度の小さい側に切り換えるようなことはせず、通常その
まま通話し続けると考えられる。In the portable telephone device having such a structure, the user himself has to operate the switching switch to adjust the amplification degree in accordance with the situation of the telephone conversation. It is difficult to make a telephone call while operating the switching switch in response, and such a thing is hardly performed in practice. For example, when the user sets the switching switch to a higher amplification side in advance to talk with a lower voice, when the user enters a situation where no voice is input as when listening to the other party, Therefore, it is considered that the user does not bother switching the switching switch to the side having the smaller amplification degree, and usually continues talking as it is.
【０００６】このように端末に音声が入力されていなく
周囲の雑音だけしか入力されていない場合において、従
来の携帯電話装置では周囲の雑音を単純に増幅してから
相手に送信してしまう不都合がある。またユーザが小さ
い声で通話するため切換スイツチを増幅度の大きい側に
設定しているとき、通話中周囲に突発的な大音量の雑音
が発生してこれが端末に入力された場合、従来の携帯電
話装置では音声と共に大音量の雑音も増幅してしまう不
都合があり、これにより相手に不快感を与えてしまうお
それがある。As described above, in the case where no voice is input to the terminal and only ambient noise is input, the conventional portable telephone device has a disadvantage that the ambient noise is simply amplified and then transmitted to the other party. is there. Also, when the user sets the switching switch to the side with the higher amplification to talk with a low voice, when sudden loud noise is generated around the telephone during the call and this is input to the terminal, the conventional mobile phone is used. In the telephone device, there is an inconvenience that a loud noise is amplified together with the voice, which may cause discomfort to the other party.
【０００７】本発明は以上の点を考慮してなされたもの
で、音声の増幅度を適応的に切り換えて最適な音量に調
整し得る音声増幅装置及び通信端末装置並びに音声増幅
方法を提案しようとするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to propose an audio amplifying apparatus, a communication terminal apparatus, and an audio amplifying method capable of adaptively switching an audio amplification degree to adjust an optimal volume. Is what you do.
【０００８】[0008]
【課題を解決するための手段】かかる課題を解決するた
め本発明においては、入力音声の信号レベルに応じて増
幅度を決定し、当該増幅度に基づいて入力音声を増幅す
るようにした。このように入力音声の信号レベルに応じ
て増幅度を決定するようにしたことにより、信号レベル
に合わせて増幅度を適応的に切り換えることができる。
従つて、ユーザの手間をかけずに容易に最適な音量に調
整することができる。According to the present invention, an amplification degree is determined according to a signal level of an input sound, and the input sound is amplified based on the amplification degree. As described above, the amplification degree is determined according to the signal level of the input voice, so that the amplification degree can be adaptively switched according to the signal level.
Therefore, it is possible to easily adjust the sound volume to an optimum volume without any trouble of the user.
【０００９】また本発明においては、最大振幅を基に入
力音声が有音か無音か検出し、これによつて無音が検出
された場合、入力音声を増幅しないように増幅度を決定
するようにした。このように入力音声が無音のときには
増幅しないようにしたことにより、雑音だけが増大する
ことを回避することができる。Further, in the present invention, it is determined whether or not the input voice is sound or non-voice based on the maximum amplitude, and when no voice is detected, the amplification degree is determined so as not to amplify the input voice. did. By not amplifying when the input voice is silent, it is possible to avoid an increase in only noise.
【００１０】また本発明においては、最大振幅が所定の
しきい値より小さい場合には、予め決められた所定の増
幅度に決定し、最大振幅が所定のしきい値より大きい場
合には、最大振幅が所定のしきい値より超えている度合
に応じて所定の増幅度を減少させるようにした。このよ
うに入力音声の信号レベルが大きくなると増幅度を減少
させるようにしたことにより、クリツピングノイズが発
生しないように増幅することができる。In the present invention, when the maximum amplitude is smaller than a predetermined threshold value, a predetermined amplification degree is determined, and when the maximum amplitude is larger than the predetermined threshold value, the maximum amplification is determined. The predetermined amplification degree is reduced according to the degree of the amplitude exceeding the predetermined threshold value. As described above, when the signal level of the input voice increases, the amplification degree is reduced, so that the amplification can be performed so that clipping noise does not occur.
【００１１】[0011]
【発明の実施の形態】以下図面について、本発明の一実
施例を詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.
【００１２】図１において、１は全体として携帯電話装
置を示し、大きく分けて送信系回路と受信系回路とから
形成されている。まず送信系では、通話時にマイク２に
入力された音声信号Ｓ１はアナログ／デイジタル変換器
３に供給されるようになされている。アナログ／デイジ
タル変換器３はこの音声信号Ｓ１を音声データＳi にア
ナログ／デイジタル変換した後、切換器４に出力する。In FIG. 1, reference numeral 1 denotes a portable telephone device as a whole, which is roughly composed of a transmission system circuit and a reception system circuit. First, in the transmission system, an audio signal S1 input to the microphone 2 during a call is supplied to the analog / digital converter 3. After analog / digital conversion on the audio data S i an analog / digital converter 3 is the audio signal S1, and outputs the switching device 4.
【００１３】ここでユーザが操作部５において音量増幅
の操作をすると、操作部５はその操作情報を表す操作信
号Ｓ３を制御部６に送出する。制御部６はこの操作信号
Ｓ３に応じて制御信号Ｓ４を切換器４に出力することに
より、切換器４を音量増幅器７側に切り換える。これに
より音量増幅の操作がなされた場合には、音声データＳ
i は音量増幅器７に供給される。これとは逆に、ユーザ
が操作部５において音量増幅解除の操作をすると、制御
部６は制御信号Ｓ４を出力して切換器４をスピーチエン
コーダ８側に切り換える。これにより音量増幅解除の操
作がなされた場合には、音声データＳi は音量増幅器７
を介さずに直接スピーチエンコーダ８に供給され、増幅
されないようになされている。Here, when the user performs an operation of volume amplification on the operation unit 5, the operation unit 5 sends an operation signal S3 representing the operation information to the control unit 6. The control unit 6 switches the switch 4 to the volume amplifier 7 by outputting a control signal S4 to the switch 4 in response to the operation signal S3. Thus, when the volume amplification operation is performed, the audio data S
i is supplied to the volume amplifier 7. Conversely, when the user performs an operation of canceling the volume amplification on the operation unit 5, the control unit 6 outputs the control signal S4 and switches the switch 4 to the speech encoder 8 side. As a result, when the operation of releasing the volume amplification is performed, the audio data Si is transmitted to the volume amplifier 7.
, And is supplied directly to the speech encoder 8 without being amplified.
【００１４】音量増幅器７は後述するような処理によつ
て音声データＳi を増幅し、これを音声データＳo とし
てスピーチエンコーダ８に出力する。スピーチエンコー
ダ８は音声データＳi 又はＳo を所定の方式で符号化
し、その結果得られる送信データＳ６をチヤンネルエン
コーダ９に出力する。チヤンネルエンコーダ９は送信デ
ータＳ６に対して誤り訂正符号を付加する等のデータ処
理をフレーム単位で行い、その結果得られる送信データ
Ｓ７を変調器１０に出力する。[0014] volume amplifier 7 amplifies the I connexion audio data S i to the processing to be described later, and outputs it to the speech encoder 8 as audio data S o. The speech encoder 8 encodes the audio data S i or S o by a predetermined method, and outputs the transmission data S 6 obtained as a result to the channel encoder 9. The channel encoder 9 performs data processing such as adding an error correction code to the transmission data S6 for each frame, and outputs the transmission data S7 obtained as a result to the modulator 10.
【００１５】変調器１０は送信データＳ７に所定の変調
を施し、その結果得られる送信信号Ｓ８を送信用の高周
波処理回路（ＴＸ）１１に出力する。この送信用の高周
波処理回路１１は送信信号Ｓ８を高周波帯域に周波数変
換し、その結果得られる送信信号Ｓ９をアンテナ１２に
供給する。これによりアンテナ１２から送信信号Ｓ９が
送信される。The modulator 10 performs a predetermined modulation on the transmission data S7 and outputs a transmission signal S8 obtained as a result to a high frequency processing circuit (TX) 11 for transmission. The transmission high-frequency processing circuit 11 converts the frequency of the transmission signal S8 into a high-frequency band, and supplies the resultant transmission signal S9 to the antenna 12. As a result, the transmission signal S9 is transmitted from the antenna 12.
【００１６】続いて受信系では、アンテナ１２によつて
受信された受信信号Ｓ１０は受信用の高周波処理回路
（ＲＸ）１３に入力される。この受信用の高周波処理回
路１３は受信信号Ｓ１０を低周波帯域に周波数変換し、
その結果得られる受信信号Ｓ１１を復調器１４に出力す
る。復調器１４は受信信号Ｓ１１を復調することにより
受信データＳ１２を得、この受信データＳ１２をチヤン
ネルデコーダ１５に出力する。Subsequently, in the receiving system, the received signal S10 received by the antenna 12 is input to a high frequency processing circuit (RX) 13 for reception. The receiving high-frequency processing circuit 13 converts the frequency of the received signal S10 into a low-frequency band,
The resulting received signal S11 is output to demodulator 14. The demodulator 14 obtains the reception data S12 by demodulating the reception signal S11, and outputs the reception data S12 to the channel decoder 15.
【００１７】チヤンネルデコーダ１５はフレーム単位で
受信データＳ１２に所定のデータ処理（例えば伝送途中
で発生した符号誤りを検出し、マスクする処理等）を行
い、その結果得られる受信データＳ１３をスピーチデコ
ーダ１６に出力する。スピーチデコーダ１６は受信デー
タＳ１３を音声データＳ１４に復号化し、当該音声デー
タＳ１４をデイジタル／アナログ変換器１７に出力す
る。デイジタル／アナログ変換器１７は音声データＳ１
４を音声信号Ｓ１５にデイジタル／アナログ変換した
後、スピーカ１８を介して音声として出力する。The channel decoder 15 performs predetermined data processing (for example, a process of detecting a code error occurring during transmission and masking the received data S12) on a frame-by-frame basis, and converts the resulting received data S13 into a speech decoder 16 Output to The speech decoder 16 decodes the received data S13 into audio data S14, and outputs the audio data S14 to the digital / analog converter 17. The digital / analog converter 17 outputs the audio data S1.
4 is converted into an audio signal S15 by digital / analog conversion, and then output as audio via a speaker 18.
【００１８】ここで上述した音量増幅器７について図２
を用いて具体的に説明する。まず音量増幅器７において
音声データＳi は音量増幅部２０と最大振幅検出部２１
に供給される。最大振幅検出部２１は音声データＳi の
所定サンプル数をフレームとすることにより、音声デー
タＳi の１フレーム分を音声フレームデータＳi [n]と
する。そして最大振幅検出部２１はこの音声フレームデ
ータＳi [n] 中の最大振幅Ａmax を検出し、当該最大振
幅Ａmax を有音／無音検出部２２及び音量制御部２３に
出力する。FIG. 2 shows the volume amplifier 7 described above.
This will be specifically described with reference to FIG. First, in the volume amplifier 7, the audio data Si is transmitted to the volume amplification unit 20 and the maximum amplitude detection
Supplied to The maximum amplitude detecting unit 21 by a frame a predetermined number of audio data samples S i, the voice frame data S i [n] for one frame of audio data S i. The maximum amplitude detector 21 detects the maximum amplitude A max in the audio frame data S i [n], and outputs the maximum amplitude A max to the sound / non-sound detector 22 and the volume controller 23.
【００１９】有音／無音検出部２２は、最大振幅Ａmax
及び有音／無音判定しきい値Ａmuteを基に有音か無音か
検出し、その検出結果を有音／無音フラグデータＳ２０
として音量制御部２３に出力する。音量制御部２３では
最大振幅Ａmax 及び有音／無音フラグデータＳ２０を基
に増幅率ａo を決定し、当該増幅率ａo を音量増幅部２
０に出力する。音量増幅部２０は増幅率ａo によつて音
声フレームデータＳi[n] を増幅し、その結果得られる
音声フレームデータＳo [n] をスピーチエンコーダ８に
出力する。The sound / non-sound detecting section 22 has a maximum amplitude A max
And a sound / no-sound determination threshold value A mute, and detects whether there is sound or no sound, and determines the detection result as a sound / silence flag data S20.
Is output to the volume control unit 23. The volume control unit 23 determines the amplification factor a o based on the maximum amplitude A max and the sound / silence flag data S20, and uses the amplification factor a o as the volume amplification unit 2.
Output to 0. The volume amplifying unit 20 amplifies the audio frame data S i [n] by the amplification factor a o , and outputs the resulting audio frame data S o [n] to the speech encoder 8.
【００２０】ここで音量増幅器７における音声増幅方法
について図３に示すフローチヤートを用いて具体的に説
明する。まずステツプＳＰ１から入つたステツプＳＰ２
において、最大振幅検出部２１では音声フレームデータ
Ｓi [n] から最大振幅Ａmaxを検出し、当該最大振幅Ａ
max を有音／無音検出部２２及び音量制御部２３に出力
する。Here, a sound amplification method in the volume amplifier 7 will be specifically described with reference to a flowchart shown in FIG. First, step SP2 entered from step SP1
, The maximum amplitude detector 21 detects the maximum amplitude A max from the audio frame data S i [n], and
max is output to the sound / silence detection unit 22 and the volume control unit 23.
【００２１】ステツプＳＰ３において有音／無音検出部
２２では直近Ｎフレームの最大振幅Ａmax を保存してお
り、この直近Ｎフレームの最大振幅Ａmax が有音／無音
判定しきい値Ａmuteより大きいか否かを調べることによ
り有音か無音か検出し、その検出結果を有音／無音フラ
グデータＳ２０として音量制御部２３に出力する。有音
／無音検出部２２は例えば直近Ｎフレームにおいて少な
くとも１フレームが有音／無音判定しきい値Ａmuteより
大きい時有音と判定するようになされている。これによ
り有音／無音検出部２２は誤検出を防ぐようになされて
いる。ステツプＳＰ４において音量制御部２３では有音
／無音フラグデータＳ２０を調べることにより、そのフ
レームが有音か無音かを判定する。その結果、有音と判
定された場合には音量制御部２３はステツプＳＰ５に移
行し、無音と判定された場合にはステツプＳＰ６に移行
する。In step SP3, the sound / silence detecting section 22 stores the maximum amplitude A max of the latest N frames, and the maximum amplitude A max of the latest N frames is larger than the voice / silence determination threshold A mute. By checking whether or not this is the case, it detects whether there is sound or no sound, and outputs the detection result to the sound volume control unit 23 as sound / silence flag data S20. For example, the sound / silence detecting unit 22 determines that there is sound when at least one of the latest N frames is larger than a sound / silence determination threshold value A mute . Thus, the sound / silence detection unit 22 prevents erroneous detection. In step SP4, the volume control section 23 examines the sound / silence flag data S20 to determine whether the frame is sound or silence. As a result, when it is determined that there is sound, the volume control unit 23 proceeds to step SP5, and when it is determined that there is no sound, the process proceeds to step SP6.
【００２２】ここで音量制御部２３においては予め決め
られた増幅率をａu とし、この増幅率ａu を信号レベル
に応じて変化させた増幅率をａi としている。さらにこ
の増幅率ａi をサンプリングデータ毎に平滑化した増幅
率をａo としている。ところで最大振幅Ａmax がダイナ
ミツクレンジの最大値より大きい値に増幅されると、波
形のピーク値付近が切りとられるようなひずみ、すなわ
ちクリツピングが発生する。このクリツピングは雑音の
発生原因になるため、音量制御部２３ではクリツピング
が発生しないように増幅率ａi を変化させている。さら
に音量制御部２３においては増幅率ａu によつてダイナ
ミツクレンジの最大値に増幅される最大振幅Ａmax をク
リツピングの発生しない最大振幅しきい値ＡTHとし、こ
の最大振幅しきい値ＡTHを用いてクリツピングが発生し
ないように増幅率ａi を決定している。Here, in the volume control unit 23, a predetermined amplification factor is set as a u , and an amplification factor obtained by changing the amplification factor a u according to the signal level is set as a i . Further, the gain obtained by smoothing the gain ai for each sampling data is represented by ao . When the maximum amplitude Amax is amplified to a value larger than the maximum value of the dynamic range, distortion such as clipping near the peak value of the waveform, that is, clipping occurs. Since this clipping causes noise, the volume control unit 23 changes the amplification factor a i so that clipping does not occur. The maximum amplitude threshold A TH is not the maximum amplitude A max is amplified to the maximum value of Yotsute dynamic range to gain a u occurred Kuritsupingu in yet volume controller 23, the maximum amplitude threshold A TH Is used to determine the amplification factor a i so that clipping does not occur.
【００２３】ステツプＳＰ５において音量制御部２３で
は音声フレームデータＳi [n] の最大振幅Ａmax がクリ
ツピングの発生しない最大振幅しきい値ＡTHより大きい
か否か判定する。その結果、最大振幅Ａmax が最大振幅
しきい値ＡTHより大きくないと判定された場合には音量
制御部２３はステツプＳＰ７に移行し、最大振幅Ａmax
が最大振幅しきい値ＡTHより大きいと判定された場合に
はステツプＳＰ８に移行する。In step SP5, the volume control section 23 determines whether or not the maximum amplitude A max of the audio frame data S i [n] is larger than the maximum amplitude threshold A TH at which clipping does not occur. As a result, when it is determined that the maximum amplitude A max is not larger than the maximum amplitude threshold value A TH , the volume control unit 23 proceeds to step SP7, and the maximum amplitude A max
There proceeds to step SP8 when it is determined that greater than the maximum amplitude threshold A TH.
【００２４】ステツプＳＰ６において音量制御部２３で
は、増幅率ａi に「１」を設定することにより増幅を行
わないようにして、無音のときには増幅しないようにし
ている。ステツプＳＰ７において音量制御部２３では増
幅率ａi を増幅率ａu に決定し、増幅率ａu によつて増
幅するようにしている。ステツプＳＰ８において音量制
御部２３では増幅率ａi を、次式In step SP6, the volume controller 23 sets the amplification factor ai to "1" so that amplification is not performed, and amplification is not performed when there is no sound. The amplification factor a i the volume control section 23 determines the amplification factor a u at step SP7, so that to by connexion amplified amplification factor a u. In step SP8, the volume control unit 23 calculates the amplification factor a i by the following equation.
【数１】 によつて求め、クリツピングの発生を防止している。こ
のようにして最大振幅Ａmax が最大振幅しきい値ＡTHよ
り小さいか或いは等しいとき増幅率ａi を増幅率ａu に
決定し、最大振幅Ａmax が最大振幅しきい値ＡTHより大
きいときには増幅率ａi は増幅率ａu より小さくなるよ
うになされている。(Equation 1) To prevent clipping from occurring. In this way, when the maximum amplitude A max is smaller than or equal to the maximum amplitude threshold A TH, the amplification factor a i is determined as the amplification factor a u , and when the maximum amplitude A max is larger than the maximum amplitude threshold value A TH , The amplification factor a i is set to be smaller than the amplification factor a u .
【００２５】ステツプＳＰ９において音量制御部２３で
はカウンタｋを「０」に設定する。ところで増幅率ａi
はサンプリングデータ毎に値が極端に異なると、音声の
不連続が生じるおそれがあり、ステツプＳＰ１０におい
て音量制御部２３ではこの不都合を解決するため増幅率
ａi を、次式At step SP9, the volume controller 23 sets the counter k to "0". By the way, the amplification factor a i
If the value of each sampling data is extremely different, discontinuity of the sound may occur. In step SP10, the volume control unit 23 sets the amplification factor a i to solve this inconvenience by the following equation.
【数２】 によつて平滑化することにより増幅率ａo を得、この増
幅率ａo を音量増幅部２０に出力する。ここで右辺の増
幅率ａo は前回求めた、１つ前のサンプリングデータの
増幅率ａo である。またｍは１以下の定数であり、例え
ばこの場合には１／４０程度が用いられる。(Equation 2) Obtain the amplification factor a o by smoothing Te Niyotsu, and outputs the amplification factor a o the volume amplifier unit 20. Wherein the right side of the amplification factor a o is previously obtained, the amplification factor a o of the previous sampling data. In addition, m is a constant equal to or less than 1. For example, in this case, about 1/40 is used.
【００２６】ステツプＳＰ１１において音量増幅部２０
では、音声フレームデータＳi [k]及び増幅率ａo を基
に音声フレームデータＳo [k] を、次式In step SP11, the volume amplifying section 20
Then, based on the audio frame data S i [k] and the amplification factor a o , the audio frame data S o [k] is expressed by the following equation.
【数３】 に示すように、音声フレームデータＳi [k] と増幅率ａ
o を乗算することによつて算出する。ステツプＳＰ１２
において音量制御部２３では、カウンタｋに「１」を加
算して、当該カウンタｋをインクリメントする。(Equation 3) As shown in the figure, the audio frame data S i [k] and the amplification factor a
Calculated by multiplying o . Step SP12
In, the volume control unit 23 adds “1” to the counter k and increments the counter k.
【００２７】ステツプＳＰ１３において音量制御部２３
では、カウンタｋが「ｎ−１」に一致したか否か、すな
わちサンプリングデータをｎ個分増幅したか否か判定す
る。その結果、サンプリングデータをｎ個分増幅したと
判定された場合には音量制御部２３はステツプＳＰ１４
に移つて処理を終了し、増幅していないと判定された場
合にはステツプＳＰ１０に戻つて動作を繰り返す。In step SP13, the volume control unit 23
Then, it is determined whether or not the counter k matches “n−1”, that is, whether or not the sampling data has been amplified by n pieces. As a result, if it is determined that n pieces of the sampling data have been amplified, the volume control unit 23 proceeds to step SP14.
Then, the process is terminated, and if it is determined that the signal is not amplified, the process returns to step SP10 to repeat the operation.
【００２８】以上の構成において、ユーザが小さい声で
通話するため操作部５において音量増幅の操作をする
と、マイク２に入力された音声信号Ｓ１はアナログ／デ
イジタル変換器３に供給され、当該アナログ／デイジタ
ル変換器３は音声信号Ｓ１を音声データＳi にアナログ
／デイジタル変換した後、切換器４を介して音量増幅器
７に出力する。音量増幅器７はこの音声データＳi を音
声データＳo に増幅した後、スピーチエンコーダ８に出
力する。In the above configuration, when the user performs a volume amplification operation on the operation unit 5 to talk in a low voice, the audio signal S1 input to the microphone 2 is supplied to the analog / digital converter 3, and the analog / digital converter 3 after digital converter 3 which is the analog / digital converts the audio signal S1 to the audio data S i, and outputs to the volume amplifier 7 via the switching unit 4. The volume amplifier 7 amplifies the audio data Si to the audio data So , and then outputs the audio data Si to the speech encoder 8.
【００２９】ここで音量増幅器７の有音／無音検出部２
２では最大振幅Ａmax が有音／無音判定しきい値Ａmute
より大きいか否かを調べることにより、有音か無音かを
検出し、その結果得られる有音／無音フラグデータＳ２
０を音量制御部２３に出力する。その結果、無音と判定
された場合には音量制御部２３では増幅率ａi に「１」
を設定し増幅を行わないようにする。このようにして音
声が無音のときには増幅しないようにしたことにより、
雑音だけが増大することを回避することができる。Here, the sound / silence detecting section 2 of the volume amplifier 7
In the case of 2, the maximum amplitude A max is equal to the sound / silence determination threshold value A mute
By examining whether it is greater than or not, it is detected whether there is sound or silence, and the resulting sound / silence flag data S2
0 is output to the volume control unit 23. As a result, when it is determined that there is no sound, the volume control unit 23 sets the amplification factor a i to “1”.
To avoid amplification. By not amplifying when the sound is silent,
It is possible to avoid an increase in only noise.
【００３０】音量制御部２３では音声フレームデータＳ
i [n] の最大振幅Ａmax がクリツピングの発生しない最
大振幅しきい値ＡTHより大きいか否か判定する。その結
果、最大振幅Ａmax が最大振幅しきい値ＡTHより大きく
ないと判定された場合には増幅率ａi を増幅率ａu に決
定し、大きいと判定された場合には上述の（１）式に示
すように、最大振幅Ａmax が最大振幅しきい値ＡTHより
超えている度合に応じて増幅率ａi を減少させるように
決定している。従つて最大振幅Ａmax が最大振幅しきい
値ＡTHより小さいか或いは等しいときは、増幅率ａi を
増幅率ａu に決定し、最大振幅Ａmax が最大振幅しきい
値ＡTHより大きいときは、その超えている度合に応じて
増幅率ａi を増幅率ａu より減少させるように決定す
る。このようにして入力音声が大きくなると増幅率ａi
が減少するようにしたことにより、クリツピングの発生
を押さえて、雑音が発生しないようにしている。The volume control unit 23 controls the audio frame data S
the maximum amplitude A max of i [n] determines whether the maximum amplitude threshold A TH is larger than causing no Kuritsupingu. As a result, when it is determined that the maximum amplitude A max is not larger than the maximum amplitude threshold value A TH , the amplification factor a i is determined to be the amplification factor a u. ), The amplification factor a i is determined to be reduced in accordance with the degree to which the maximum amplitude A max exceeds the maximum amplitude threshold value A TH . Therefore, when the maximum amplitude A max is smaller than or equal to the maximum amplitude threshold A TH , the amplification factor a i is determined to be the amplification factor a u , and when the maximum amplitude A max is larger than the maximum amplitude threshold value A TH. Is determined so that the amplification factor a i is reduced from the amplification factor a u in accordance with the degree of exceeding. In this way, when the input voice increases, the amplification factor a i
Is reduced, thereby suppressing the occurrence of clipping and preventing the occurrence of noise.
【００３１】音量増幅部２０では、音声フレームデータ
Ｓi [k] 及び増幅率ａo を基に音声フレームデータＳo
[k] を上述の（３）式によつて求め、当該音声フレーム
データＳo [k] をスピーチエンコーダ８に出力する。こ
れにより音量増幅部２０では小さな声を相手が聞き取り
やすい音量に増幅することができる。In the sound volume amplifying section 20, the audio frame data S o based on the audio frame data S i [k] and the amplification factor a o.
[k] is obtained by the above equation (3), and the voice frame data S o [k] is output to the speech encoder 8. Thus, the volume amplifying unit 20 can amplify a small voice to a volume that is easy for the other party to hear.
【００３２】このようにして入力音声の信号レベルに応
じて増幅度を決定するようにしたことにより、信号レベ
ルに合わせて増幅度を適応的に切り換えることができ
る。これにより携帯電話装置１では周囲の雑音が増大し
ないように増幅しながら、ユーザの手間をかけずに容易
に最適な音量に調整することができ、従来に比して一段
と使い勝手を向上し得る。As described above, the amplification degree is determined according to the signal level of the input voice, so that the amplification degree can be adaptively switched according to the signal level. As a result, the mobile phone device 1 can easily adjust the sound volume to an optimum volume without any user's trouble while amplifying the surrounding noise so as not to increase, and can further improve the usability as compared with the related art.
【００３３】以上の構成によれば、入力音声の信号レベ
ルに応じて増幅度を決定するようにしたことにより、信
号レベルに合わせて増幅度を適応的に切り換えることが
でき、かくしてユーザの手間をかけずに容易に最適な音
量に調整することができる携帯電話装置１を実現でき
る。According to the above arrangement, the amplification degree is determined according to the signal level of the input voice, so that the amplification degree can be adaptively switched in accordance with the signal level, thus reducing the user's labor. It is possible to realize the mobile phone device 1 that can easily adjust to the optimum volume without using the phone.
【００３４】なお上述の実施例においては、音声フレー
ムデータＳi [n] の最大振幅Ａmaxを直接検出した場合
について述べたが、本発明はこれに限らず、フレーム当
たりの平均電力から最大振幅を検出しても上述の場合と
同様の効果を得ることができる。In the above-described embodiment, the case where the maximum amplitude A max of the audio frame data S i [n] is directly detected has been described. However, the present invention is not limited to this. , The same effect as in the above case can be obtained.
【００３５】ここでフレーム当たりの平均電力を用いる
場合について、図３との対応部分に同一符号を付して示
す図４を用いて説明する。まずステツプＳＰ２０から入
つたステツプＳＰ２１において、最大振幅検出部２１で
は音声フレームデータＳi [n] を基にフレーム当たりの
平均電力ＰFRAME を、次式The case where the average power per frame is used will be described with reference to FIG. First, in step SP21 entered from step SP20, the maximum amplitude detector 21 calculates the average power per frame P FRAME based on the audio frame data S i [n] by the following equation.
【数４】 によつて求める。(Equation 4) Ask for.
【００３６】ステツプＳＰ２２において最大振幅検出部
２１では平均電力ＰFRAME を基にフレーム当たりの平均
振幅Ａav(FRAME) を、次式In step SP22, the maximum amplitude detector 21 calculates the average amplitude A av (FRAME) per frame based on the average power P FRAME by the following equation.
【数５】 によつて求める。(Equation 5) Ask for.
【００３７】ステツプＳＰ２３において最大振幅検出部
２１では、平均振幅Ａav(FRAME) に対する最大振幅の比
率である波高率ａh を基に推定最大振幅Ａ
es(FRAME) を、次式[0037] step at the maximum amplitude detecting unit 21 at SP23, the average amplitude A av (FRAME) maximum estimated based on crest factor a h is the ratio of the maximum amplitude amplitude for A
es (FRAME) is
【数６】 によつて求める。(Equation 6) Ask for.
【００３８】このようにして最大振幅検出部２１では１
フレーム分のサンプリングデータの積分をサンプル数に
よつて割り算することにより、フレーム当たりの平均電
力を算出する。さらに最大振幅検出部２１ではこの平均
電力の平方根をとつて平均振幅を求めた後、当該平均振
幅を波高率によつて割り算し最大振幅を得る。この処理
が終わるとステツプＳＰ３に移り、当該ステツプＳＰ３
からステツプＳＰ１４までにおいて、音量増幅器７は平
均電力から算出した最大振幅の大きさに応じて増幅度を
切り換え、当該増幅度によつて入力音声を増幅してい
る。すなわち音量増幅器７は図３に示すフローチヤート
のステツプＳＰ３からステツプＳＰ１４までと同じ動作
を行つている。As described above, the maximum amplitude detector 21 outputs 1
The average power per frame is calculated by dividing the integral of the sampling data for the frame by the number of samples. Further, the maximum amplitude detector 21 calculates the average amplitude by taking the square root of the average power, and then divides the average amplitude by the crest factor to obtain the maximum amplitude. When this process ends, the process moves to step SP3.
From step to step SP14, the volume amplifier 7 switches the amplification degree according to the maximum amplitude calculated from the average power, and amplifies the input sound by the amplification degree. That is, the volume amplifier 7 performs the same operation as the steps SP3 to SP14 of the flowchart shown in FIG.
【００３９】また上述の実施例においては、本発明を携
帯電話装置に適用した場合について述べたが、本発明は
これに限らず、音声の送受信手段を備える通信端末装置
に本発明を適用しても上述の場合と同様の効果を得るこ
とができる。In the above-described embodiment, the case where the present invention is applied to a portable telephone device has been described. However, the present invention is not limited to this, and the present invention is applied to a communication terminal device having voice transmitting / receiving means. Can obtain the same effect as the above case.
【００４０】[0040]
【発明の効果】上述のように本発明によれば、入力音声
の信号レベルに応じて増幅度を決定するようにしたこと
により、信号レベルに合わせて増幅度を適応的に切り換
えることができ、ユーザの手間をかけずに容易に最適な
音量に調整し得る。As described above, according to the present invention, the amplification degree is determined according to the signal level of the input sound, so that the amplification degree can be adaptively switched according to the signal level. It is possible to easily adjust the volume to an optimum level without any trouble of the user.
【図１】本発明の一実施例による携帯電話装置の構成を
示すブロツク図である。FIG. 1 is a block diagram showing a configuration of a mobile phone device according to one embodiment of the present invention.
【図２】音量増幅器の内部構成を示すブロツク図であ
る。FIG. 2 is a block diagram showing an internal configuration of a volume amplifier.
【図３】音声増幅方法を示すフローチヤートである。FIG. 3 is a flowchart showing an audio amplification method.
【図４】平均電力を用いた音声増幅方法を示すフローチ
ヤートである。FIG. 4 is a flowchart showing an audio amplification method using average power.
１……携帯電話装置、２……マイク、３……アナログ／
デイジタル変換器、４……切換器、５……操作部、６…
…制御部、７……音量増幅器、８……スピーチエンコー
ダ、９……チヤンネルエンコーダ、１０……変調器、１
２……アンテナ、１４……復調器、１５……チヤンネル
デコーダ、１６……スピーチデコーダ、１７……デイジ
タル／アナログ変換器、１８……スピーカ、２０……音
量増幅部、２１……最大振幅検出部、２２……有音／無
音検出部、２３……音量制御部。1 ... mobile phone device, 2 ... microphone, 3 ... analog /
Digital converter, 4 ... Switch, 5 ... Operation unit, 6 ...
... Control unit, 7 ... Volume amplifier, 8 ... Speech encoder, 9 ... Channel encoder, 10 ... Modulator, 1
2 Antenna, 14 Demodulator, 15 Channel decoder, 16 Speech decoder, 17 Digital / analog converter, 18 Speaker, 20 Volume amplifying unit, 21 Maximum amplitude detection , 22 ... Sound / silence detection unit, 23 ... Volume control unit.
Claims (21)
て、 上記入力音声の信号レベルに応じて増幅度を決定し、当
該増幅度に基づいて上記入力音声を増幅する音声増幅手
段を具えることを特徴とする音声増幅装置。1. An audio amplifying device for amplifying an input audio, comprising: an audio amplifier for determining an amplification degree according to a signal level of the input audio, and amplifying the input audio based on the amplification degree. Characteristic audio amplifier.
と、 上記最大振幅検出手段によつて検出した上記最大振幅に
基づいて上記増幅度を決定する制御手段と、 上記増幅度に基づいて上記入力音声を増幅する増幅手段
とを具えることを特徴とする請求項１に記載の音声増幅
装置。2. The audio amplification means includes: a maximum amplitude detection means for detecting a maximum amplitude of the input voice; and a control means for determining the amplification degree based on the maximum amplitude detected by the maximum amplitude detection means. The audio amplification apparatus according to claim 1, further comprising: amplification means for amplifying the input audio based on the amplification degree.
レーム毎に上記最大振幅を検出することを特徴とする請
求項２に記載の音声増幅装置。3. The audio amplifying device according to claim 2, wherein said maximum amplitude detecting means sets a predetermined number of samples of said input voice as a frame and detects said maximum amplitude for each frame.
レーム内の平均電力に基づいて上記最大振幅を検出する
ことを特徴とする請求項２に記載の音声増幅装置。4. The voice according to claim 2, wherein said maximum amplitude detection means detects a predetermined number of samples of said input voice as a frame and detects said maximum amplitude based on an average power in said frame. Amplifying device.
無音か検出する有音無音検出手段を具え、 当該有音無音検出手段によつて無音が検出された場合、
上記制御手段は、上記入力音声を増幅しないように上記
増幅度を決定することを特徴とする請求項２に記載の音
声増幅装置。5. A sound / silence detecting means for detecting whether the input voice is sound or silence based on the maximum amplitude, wherein when the sound / silence detecting means detects silence,
The audio amplifier according to claim 2, wherein the control means determines the amplification degree so as not to amplify the input audio.
め決められた所定の増幅度に決定し、 上記最大振幅が上記所定のしきい値より大きい場合に
は、上記最大振幅が上記所定のしきい値より超えている
度合に応じて上記所定の増幅度を減少させることを特徴
とする請求項２に記載の音声増幅装置。6. The control means, when the maximum amplitude is smaller than a predetermined threshold value, determines a predetermined amplification degree, and when the maximum amplitude is larger than the predetermined threshold value. 3. The audio amplifying device according to claim 2, wherein the predetermined amplification degree is reduced according to a degree of the maximum amplitude exceeding the predetermined threshold value.
ることを特徴とする請求項２に記載の音声増幅装置。7. The audio amplifying device according to claim 2, wherein said control means smoothes the determined amplification degree for each sampling data.
において、 上記入力音声の信号レベルに応じて増幅度を決定し、当
該増幅度に基づいて上記入力音声を増幅する音声増幅手
段を具えることを特徴とする通信端末装置。8. A communication terminal device for amplifying and transmitting an input voice, comprising: amplifying means for determining an amplification according to a signal level of the input voice and amplifying the input voice based on the amplification. A communication terminal device.
と、 上記最大振幅検出手段によつて検出した上記最大振幅に
基づいて上記増幅度を決定する制御手段と、 上記増幅度に基づいて上記入力音声を増幅する増幅手段
とを具えることを特徴とする請求項８に記載の通信端末
装置。9. The audio amplification means includes: a maximum amplitude detection means for detecting a maximum amplitude of the input voice; and a control means for determining the amplification degree based on the maximum amplitude detected by the maximum amplitude detection means. The communication terminal device according to claim 8, further comprising: amplification means for amplifying the input voice based on the amplification degree.
レーム毎に上記最大振幅を検出することを特徴とする請
求項９に記載の通信端末装置。10. The communication terminal device according to claim 9, wherein said maximum amplitude detecting means sets a predetermined number of samples of said input voice as a frame and detects said maximum amplitude for each frame.
レーム内の平均電力に基づいて上記最大振幅を検出する
ことを特徴とする請求項９に記載の通信端末装置。11. The communication according to claim 9, wherein said maximum amplitude detecting means sets a predetermined number of samples of said input voice as a frame, and detects said maximum amplitude based on an average power in said frame. Terminal device.
か無音か検出する有音無音検出手段を具え、 当該有音無音検出手段によつて無音が検出された場合、
上記制御手段は、上記入力音声を増幅しないように上記
増幅度を決定することを特徴とする請求項９に記載の通
信端末装置。12. A sound / silence detecting means for detecting whether the input voice is sound or silence based on the maximum amplitude, wherein when the sound is detected by the sound / silence detecting means,
The communication terminal device according to claim 9, wherein the control means determines the amplification degree so as not to amplify the input voice.
め決められた所定の増幅度に決定し、 上記最大振幅が上記所定のしきい値より大きい場合に
は、上記最大振幅が上記所定のしきい値より超えている
度合に応じて上記所定の増幅度を減少させることを特徴
とする請求項９に記載の通信端末装置。13. The control means, when the maximum amplitude is smaller than a predetermined threshold value, determines a predetermined amplification degree, and when the maximum amplitude is larger than the predetermined threshold value. 10. The communication terminal device according to claim 9, wherein the predetermined amplification degree is reduced according to a degree of the maximum amplitude exceeding the predetermined threshold value.
ることを特徴とする請求項９に記載の通信端末装置。14. The communication terminal device according to claim 9, wherein said control means smoothes the determined amplification degree for each sampling data.
て、 上記入力音声の信号レベルに応じて増幅度を決定し、当
該増幅度に基づいて上記入力音声を音声増幅することを
特徴とする音声増幅方法。15. An audio amplification method for amplifying an input audio, comprising: determining an amplification degree according to a signal level of the input audio; and amplifying the input audio based on the amplification degree. Method.
当該最大振幅に基づいて増幅度を決定し、 決定した上記増幅度に基づいて上記入力音声を増幅する
ことを特徴とする請求項１５に記載の音声増幅方法。16. After detecting the maximum amplitude of the input voice,
16. The audio amplification method according to claim 15, wherein an amplification degree is determined based on the maximum amplitude, and the input audio is amplified based on the determined amplification degree.
ムとし、当該フレーム毎に上記最大振幅を検出すること
を特徴とする請求項１６に記載の音声増幅方法。17. The audio amplifying method according to claim 16, wherein a predetermined number of samples of the input audio is used as a frame, and the maximum amplitude is detected for each frame.
ムとし、当該フレーム内の平均電力に基づいて上記最大
振幅を検出することを特徴とする請求項１６に記載の音
声増幅方法。18. The audio amplifying method according to claim 16, wherein a predetermined number of samples of the input audio is used as a frame, and the maximum amplitude is detected based on an average power in the frame.
か無音か検出し、無音が検出された場合には、上記入力
音声を増幅しないように上記増幅度を決定することを特
徴とする請求項１６に記載の音声増幅方法。19. The apparatus according to claim 19, wherein the input voice is detected as a sound or a silence based on the maximum amplitude, and when no voice is detected, the amplification is determined so as not to amplify the input voice. 17. The audio amplification method according to claim 16, wherein:
い場合には、予め決められた所定の増幅度に決定し、 上記最大振幅が上記所定のしきい値より大きい場合に
は、上記最大振幅が上記所定のしきい値より超えている
度合に応じて上記所定の増幅度を減少させることを特徴
とする請求項１６に記載の音声増幅方法。20. When the maximum amplitude is smaller than a predetermined threshold value, a predetermined amplification degree is determined. When the maximum amplitude is larger than the predetermined threshold value, the maximum amplitude is determined. 17. The audio amplification method according to claim 16, wherein the predetermined amplification is reduced according to a degree of an amplitude exceeding the predetermined threshold.
タ毎に平滑化することを特徴とする請求項１６に記載の
音声増幅方法。21. The audio amplification method according to claim 16, wherein the determined amplification degree is smoothed for each sampling data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27153296A JP3824182B2 (en) | 1996-09-20 | 1996-09-20 | Audio amplification device, communication terminal device, and audio amplification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27153296A JP3824182B2 (en) | 1996-09-20 | 1996-09-20 | Audio amplification device, communication terminal device, and audio amplification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1098344A true JPH1098344A (en) | 1998-04-14 |
| JP3824182B2 JP3824182B2 (en) | 2006-09-20 |
Family
ID=17501382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27153296A Expired - Lifetime JP3824182B2 (en) | 1996-09-20 | 1996-09-20 | Audio amplification device, communication terminal device, and audio amplification method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3824182B2 (en) |
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