JPH1098344A - Voice amplifier, communication terminal equipment and voice-amplifying method - Google Patents

Voice amplifier, communication terminal equipment and voice-amplifying method

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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
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amplification
maximum amplitude
input speech
degree
audio
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JP3824182B2 (en
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Yuji Maeda
祐児 前田
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Sony Corp
ソニー株式会社
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Abstract

PROBLEM TO BE SOLVED: To easily optimize a volume, without requiring user's labor and time for a communication terminal equipment. SOLUTION: An amplitude (a0 ) is decided, corresponding to the signal level of an inputted voice S1 to provide a voice-amplifying means 7 amplifying the inputted voice based on the amplitude. Thereby the amplitude is adaptively switched corresponding to a signal level. Namely, as the amplitude is reduced, when the signal level of the inputted voice becomes high, the inputted voice can be amplified so as not to generate clipping noises. Thus, a volume is easily optimized without requiring user's labor and time.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【目次】以下の順序で本発明を説明する。 [Contents] The present invention will be described in the following order. 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 Embodiment of trying art prior art invention is solved with the Invention The problem challenges to which the invention pertains (FIGS. 1-4) Effect 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。 The present invention relates to relates to a method audio amplification apparatus and communication terminal apparatus and the audio amplifier, and is preferably applied for example to a mobile 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。 Conventionally, there is a mobile phone device as the most popular significant service of the mobile communication system. 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。 Miniaturization in recent years of the mobile phone device, lightweight greatly contribute to the reduction effect of the price, it is promoting the expanded number of subscribers. 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。 However, various problems with the expansion the number of subscribers also have emerged. 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。 For example, the user is speaking when you call in a quiet public places was time when there is a risk that or mediation is a fear that a nuisance to the surroundings, and the contents of the conversation with a call in a crowded train would be heard by others problem is. 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。 Such a time, but the user has to do not bother to'll go-between others to call in a small voice, a situation that the other party when you send in the remains of the small voice of the state is difficult to hear the voice occurs.

【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。 [0004] accordance therefor; conventional mobile telephone device to solve this situation by switching switch provided in the terminal, the user of the microphone gain by operating the changeover switch by directly cutting 換Ru, a predetermined amplification degree It is made to vary. 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。 Thereby amplifying the small voice, it is transmitted after the voice to the other party intelligible sound.

【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。 In [0008] Incidentally portable telephone device having the above configuration, although the user himself must adjust the amplification degree by operating the changeover switch according to the condition of the call, the status of the user conversations depending little is done actually such that a difficulty that a call while operating the changeover switch to. 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。 For example when a user is set to a larger side of the pre-amplification degree changeover switch for the call in a small voice, because the user has come to a situation where speech is not input as when listening to the other party any time Te, the user will not be bothered as switches smaller in amplification degree of the switching switch, usually considered to continue to call it.

【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。 [0006] In the case where this is not the only only input noise around not be voice input to the terminal, in the conventional mobile telephone device is disadvantage that and transmits it simply amplify the background noise to the other party is there. 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。 Also, when it is set to the larger side of the amplification degree of the switching switch for call user in a small voice, if this be the noise of sudden loud is generated around during the call is input to the terminal, the conventional portable in the telephone device has disadvantage that noise-loud also amplified along with the voice, thereby there is a possibility that uncomfortable feeling 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。 [0007] The present invention has been made in view of the above, and to propose a sound amplifying apparatus and a communication terminal apparatus and the sound amplification method can be adjusted to the optimum volume by switching the amplification degree of the speech adaptively it is intended to.

【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。 In the present invention for solving the Means for Solving the Problems] Such problems, an amplification degree determined according to the signal level of the input speech, and to amplify the input speech based on the degree of amplification. 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。 By which is adapted determine the amplification degree according to the signal level of the thus input voice can be switched the amplification degree according to the signal level adaptively.
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。 Accordance connexion can be adjusted to facilitate optimum volume without the hassle for 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。 [0009] In the present invention, the input speech based on the maximum amplitude is detected whether voiced or silence, if I go-between silence is detected in this so as to determine the amplification degree so as not to amplify the input speech did. 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。 By inputting voice thus was prevented from being amplified at the time of silence, it is possible to avoid that only noise is increased.

【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。 [0010] In the present invention, when the maximum amplitude is less than the predetermined threshold, it determines a predetermined amplification degree that is determined in advance, when the maximum amplitude is larger than the predetermined threshold value, the maximum and to decrease the predetermined amplification degree depending on the degree to which the amplitude is greater than a predetermined threshold. 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。 By thus input audio signal level is to reduce the amplification degree becomes larger, it is possible to chestnut tree ping noise amplifier so as not to generate.

【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。 For PREFERRED EMBODIMENTS be described with reference to the accompanying drawings an embodiment of the present invention.

【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。 [0012] In FIG. 1, 1 denotes a cellular telephone device as a whole, and is formed from a roughly transmission system circuit and receiving system circuit. 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。 The first transmission system, the audio signal S1 input to the microphone 2 during a call is made to be supplied to an analog / digital converter 3. 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S iにアナログ/デイジタル変換した後、切換器4に出力する。 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。 [0013] Here, the user performs an operation of sound volume amplifying the operation unit 5, the operation unit 5 sends an operation signal S3 representing the operation information to the control unit 6. 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。 The control unit 6 outputs a control signal S4 in accordance with the operation signal S3 to switching unit 4 switches the switching unit 4 to the volume amplifier 7 side. 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 Thus when the operating volume amplification is performed, the audio data S
iは音量増幅器7に供給される。 i is supplied to the volume amplifier 7. 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。 Conversely, when the user operates the release volume amplifying the operation unit 5, the control unit 6 switches the switching unit 4 to the speech encoder 8 side and outputs a control signal S4. 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S iは音量増幅器7 Thus when the operation of the release volume amplification is performed, the audio data S i is the volume amplifier 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。 It is supplied directly to the speech encoder 8 without using the are adapted to not 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S iを増幅し、これを音声データS oとしてスピーチエンコーダ8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. スピーチエンコーダ8は音声データS i又はS o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。 Speech encoder 8 encodes the audio data S i or S o in a predetermined manner, and outputs the transmission data S6 obtained as a result thereof in the channel encoder 9. 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。 Channel encoder 9 performs data processing such as adding an error correction code in a frame unit to the transmission data S6, 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。 The modulator 10 applies predetermined modulation to the transmission data S7, the output transmission signal S8 obtained as a result thereof in the high frequency processing circuit (TX) 11 for transmission. 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。 High frequency processing circuit 11 of the transmission is frequency-converted transmission signal S8 to the high frequency band, and supplies the transmission signal S9 obtained as a result to the antenna 12. これによりアンテナ12から送信信号S9が送信される。 Thereby transmission signal S9 from the antenna 12 is transmitted.

【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。 [0016] In Subsequently reception system, the reception signal S10 had it occurred in the receiving antenna 12 is inputted to the high frequency processing circuit (RX) 13 for receiving. 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、 High frequency processing circuit 13 for the reception frequency conversion of the received signal S10 to the low frequency band,
その結果得られる受信信号S11を復調器14に出力する。 And it outputs the received signal S11 obtained as a result to the demodulator 14. 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。 Demodulator 14 to obtain reception data S12 by demodulating the received signal S11, and outputs the reception data S12 to a 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。 The channel decoder 15 a predetermined data processing on the received data The S12 frame performed (detects a code error occurs during e.g. transmission, mask processing, etc.), the speech decoder 16 of the reception data S13 obtained as a result and outputs it to. 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。 Speech decoder 16 decodes the received data S13 to the audio data S14, and outputs the audio data S14 to the digital / analog converter 17. デイジタル/アナログ変換器17は音声データS1 Digital / analog converter 17 is audio data 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。 4 after digital / analog conversion on the audio signal S15, and outputs a voice through a speaker 18.

【0018】ここで上述した音量増幅器7について図2 [0018] The volume amplifier 7 described above here Fig. 2
を用いて具体的に説明する。 Specifically described with reference to. まず音量増幅器7において音声データS iは音量増幅部20と最大振幅検出部21 Volume amplifying section 20 is audio data S i at the first volume amplifier 7 and a maximum amplitude detector 21
に供給される。 It is supplied to. 最大振幅検出部21は音声データS i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S iの1フレーム分を音声フレームデータS i [n]とする。 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. そして最大振幅検出部21はこの音声フレームデータS i [n] 中の最大振幅A max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。 The maximum amplitude detecting unit 21 detects the maximum amplitude A max in the audio frame data S i [n], and outputs the maximum amplitude A max to a sound / silence detector 22 and the volume control unit 23.

【0019】有音/無音検出部22は、最大振幅A max The sound / silence detection unit 22, the maximum amplitude A max
及び有音/無音判定しきい値A mute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 And speech / silence determination threshold A mute detecting whether voiced or silence based on, sound and the detection result / silence flag data S20
として音量制御部23に出力する。 And outputs to the volume controller 23 as. 音量制御部23では最大振幅A max及び有音/無音フラグデータS20を基に増幅率a oを決定し、当該増幅率a oを音量増幅部2 The volume control unit 23 the maximum amplitude A max and speech / silence flag data S20 to determine the amplification factor a o based, volume amplification unit 2 the amplification factor a o
0に出力する。 And outputs it to 0. 音量増幅部20は増幅率a oによつて音声フレームデータS i [n] を増幅し、その結果得られる音声フレームデータS o [n] をスピーチエンコーダ8に出力する。 Volume amplification unit 20 amplifies the by the amplification factor a o connexion voice frame data S i [n], 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。 [0020] Here it will be specifically described with reference to the flow chart shown in FIG. 3 for sound amplification method in the volume amplifier 7. まずステツプSP1から入つたステツプSP2 First, from step SP1 NyuTsuta step SP2
において、最大振幅検出部21では音声フレームデータS i [n] から最大振幅A maxを検出し、当該最大振幅A In detects the maximum amplitude A max the maximum amplitude detecting unit 21 in the audio frame data S i [n], the maximum amplitude A
maxを有音/無音検出部22及び音量制御部23に出力する。 and it outputs the max to a sound / silence detector 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A maxを保存しており、この直近Nフレームの最大振幅A maxが有音/無音判定しきい値A mute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。 [0021] In speech / silence detector 22 in step SP3 and to save the maximum amplitude A max of the last N frames, the maximum amplitude A max of the last N frames is greater than speech / silence determination threshold value A mute whether detected or sound or silence by examining, and outputs to the volume controller 23 a detection result as speech / silence flag data S20. 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A muteより大きい時有音と判定するようになされている。 Speech / silence detector 22 is adapted to determine at least one frame voiced / silent decision threshold A mute greater when voiced for the past N frames, for example. 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。 Thus speech / silence detector 22 is adapted to prevent erroneous detection. 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。 By examining the speech / silence flag data S20 in the volume controller 23 at step SP4, the frame determines whether voiced or silence. 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。 As a result, when it is determined that the sound is the volume control unit 23 proceeds to step SP5, if it is determined that the silence 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a uとし、この増幅率a uを信号レベルに応じて変化させた増幅率をa iとしている。 [0022] are here the amplification factor determined in advance in the volume controller 23 and a u, the amplification factor is varied in accordance with the amplification factor a u in the signal level and a i. さらにこの増幅率a iをサンプリングデータ毎に平滑化した増幅率をa oとしている。 Further it has the amplification factor obtained by smoothing the amplification factor a i for each sampling data with a o. ところで最大振幅A max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。 However the maximum amplitude A max is amplified to a maximum value greater than the value of the dynamic range, distortion such as the vicinity of the peak value of the waveform is clipped, i.e. Kuritsupingu occurs. 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a iを変化させている。 The Kuritsupingu is to become a cause of noise, Kuritsupingu the volume controller 23 is changing the amplification factor a i so as not to generate. さらに音量制御部23においては増幅率a u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A maxをクリツピングの発生しない最大振幅しきい値A THとし、この最大振幅しきい値A THを用いてクリツピングが発生しないように増幅率a iを決定している。 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 Kuritsupingu is determined amplification factor a i so as not to generate with.

【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S i [n] の最大振幅A maxがクリツピングの発生しない最大振幅しきい値A THより大きいか否か判定する。 [0023] determines whether the maximum amplitude threshold A TH is greater than or not the maximum amplitude A max of the volume controller 23 voice frame data S i [n] in step SP5 is not generated in Kuritsupingu. その結果、最大振幅A maxが最大振幅しきい値A TH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A max As a result, the volume control unit 23 when the maximum amplitude A max is not greater than the maximum amplitude threshold A TH, the process proceeds to step SP7, the maximum amplitude A max
が最大振幅しきい値A TH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。 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a i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。 [0024] The volume control unit 23 at step SP6, so as not to perform amplification by setting "1" to the amplification factor a i, so that not amplified when the silence. ステツプSP7において音量制御部23では増幅率a iを増幅率a uに決定し、増幅率a uによつて増幅するようにしている。 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. ステツプSP8において音量制御部23では増幅率a iを、次式 Step the amplification factor a i in the volume controller 23 in SP8, the following equation

【数1】 [Number 1] によつて求め、クリツピングの発生を防止している。 By the go-between sought, so as to prevent the occurrence of Kuritsupingu. このようにして最大振幅A maxが最大振幅しきい値A THより小さいか或いは等しいとき増幅率a iを増幅率a uに決定し、最大振幅A maxが最大振幅しきい値A THより大きいときには増幅率a iは増幅率a uより小さくなるようになされている。 Thus the maximum amplitude A max determines the maximum amplitude threshold A TH is smaller than or the amplification factor a i when equal to the amplification factor a u, a maximum when the amplitude A max is greater than the maximum amplitude threshold A TH is the amplification factor a i is made 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。 [0025] sets a counter k in the volume control section 23 in step SP9 to "0". ところで増幅率a i By the way the amplification factor a i
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a iを、次式 When the extremely different value for each sampling data, there is a possibility that the discontinuity of speech occurs, the amplification factor a i to solve this inconvenience the volume control unit 23 at step SP10, the following equation

【数2】 [Number 2] によつて平滑化することにより増幅率a oを得、この増幅率a oを音量増幅部20に出力する。 Obtain the amplification factor a o by smoothing Te Niyotsu, and outputs the amplification factor a o the volume amplifier unit 20. ここで右辺の増幅率a oは前回求めた、1つ前のサンプリングデータの増幅率a oである。 Wherein the right side of the amplification factor a o is previously obtained, the amplification factor a o of the previous sampling data. 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。 The m is a constant of 1 or less, about 1/40 is used when for example this.

【0026】ステツプSP11において音量増幅部20 [0026] The volume in step SP11 amplifying section 20
では、音声フレームデータS i [k]及び増幅率a oを基に音声フレームデータS o [k] を、次式 In the audio frame data S i [k] and gain a o audio frame data on the basis of the S o [k], the following equation

【数3】 [Number 3] に示すように、音声フレームデータS i [k] と増幅率a As shown in, the audio frame data S i [k] and the amplification factor a
oを乗算することによつて算出する。 We'll go-between calculated by multiplying the o. ステツプSP12 Step 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。 In the volume control unit 23 adds "1" to the counter k, it increments the counter k.

【0027】ステツプSP13において音量制御部23 The volume control unit 23 in step SP13
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。 So whether the counter k coincides with the "n-1", i.e. it determines whether the sampled data is amplified n pieces minute. 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 As a result, the volume control unit 23 when the sampled data is determined by amplifying the n partial is step 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。 To end the transfer connexion process, if it is determined not to be amplified is repeated reversals connexion operation to step SP10.

【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S i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。 [0028] In the above configuration, when the operation of the volume amplifier the operation unit 5 to call the user is small voice, audio signal S1 input to the microphone 2 is supplied to an analog / digital converter 3, the analog / 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. 音量増幅器7はこの音声データS iを音声データS oに増幅した後、スピーチエンコーダ8に出力する。 After the volume amplifier 7 which amplifies the audio data S i to the audio data S o, and outputs the speech encoder 8.

【0029】ここで音量増幅器7の有音/無音検出部2 [0029] Here, the volume amplifier 7 speech / silence detector 2
2では最大振幅A maxが有音/無音判定しきい値A mute The maximum amplitude A max at 2 voice / silence determination threshold value A mute
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 By examining is greater than or not, it voiced whether detects silence, the resulting speech / silence flag data S2
0を音量制御部23に出力する。 Outputs 0 to the volume control unit 23. 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a iに「1」 "1" As a result, the amplification factor a i the volume control section 23 when it is determined that the silence
を設定し増幅を行わないようにする。 Set to not perform amplification. 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、 By sound in this way is to avoid amplification when the silence,
雑音だけが増大することを回避することができる。 It is possible to avoid that the only noise is increased.

【0030】音量制御部23では音声フレームデータS [0030] In the volume control unit 23 voice frame data S
i [n] の最大振幅A maxがクリツピングの発生しない最大振幅しきい値A THより大きいか否か判定する。 the maximum amplitude A max of i [n] determines whether the maximum amplitude threshold A TH is larger than causing no Kuritsupingu. その結果、最大振幅A maxが最大振幅しきい値A THより大きくないと判定された場合には増幅率a iを増幅率a u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A maxが最大振幅しきい値A THより超えている度合に応じて増幅率a iを減少させるように決定している。 As a result, the maximum amplitude A max determines the amplification factor a i to gain a u if it is not greater than the maximum amplitude threshold A TH, described above if it is determined to be larger (1 ) as shown in equation, the maximum amplitude a max is determined to reduce the amplification factor a i in accordance with a degree that exceeds the maximum amplitude threshold a TH. 従つて最大振幅A maxが最大振幅しきい値A THより小さいか或いは等しいときは、増幅率a iを増幅率a uに決定し、最大振幅A maxが最大振幅しきい値A THより大きいときは、その超えている度合に応じて増幅率a iを増幅率a uより減少させるように決定する。 Accordance connexion maximum when the amplitude A max is equal to or maximum amplitude threshold A TH is smaller than determines the amplification factor a i to gain a u, a maximum when the amplitude A max is greater than the maximum amplitude threshold A TH determines the amplification factor a i in accordance with a degree that exceeds the to decrease from the amplification factor a u. このようにして入力音声が大きくなると増幅率a i Thus the input speech is increased as the amplification factor a i
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。 By but was set to decrease, by pressing the occurrence of Kuritsupingu, noise is prevented from being generated.

【0031】音量増幅部20では、音声フレームデータS i [k] 及び増幅率a oを基に音声フレームデータS o [0031] In volume amplifying section 20, the audio frame data S i [k] and gain a o audio frame data based on S o
[k] を上述の(3)式によつて求め、当該音声フレームデータS o [k] をスピーチエンコーダ8に出力する。 [k] a by connexion determined in the aforementioned (3), and outputs the audio frame data S o [k] in the speech encoder 8. 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。 Thus small in volume amplifying section 20 voices can partner is amplified to intelligible sound.

【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。 [0032] By you to determine the amplification factor according to the signal level of the input speech this way, it is possible to switch the amplification factor in accordance with the signal level adaptively. 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。 While amplified Thus, as the ambient noise in the cellular telephone device 1 does not increase, without the hassle of user it can be adjusted to facilitate optimum volume may further improve the usability in comparison with the conventional.

【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 configuration, by which is adapted to determine an amplification degree according to the signal level of the input voice, can switch the amplification degree according to the signal level adaptively, thus the labor of the user the cellular telephone device 1 can be adjusted to facilitate optimum volume without taking can be realized.

【0034】なお上述の実施例においては、音声フレームデータS i [n] の最大振幅A max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。 [0034] In the aforementioned embodiment, it has dealt with the case of detecting the maximum amplitude A max of the audio frame data S i [n] directly, the present invention is not limited to this, the maximum amplitude from the average power per frame it can be detected to obtain the same effect as described above.

【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。 [0035] For the case of using the average power per frame will now be described with reference to FIG. 4 where the same reference numerals are assigned to corresponding parts in FIG. 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S i [n] を基にフレーム当たりの平均電力P FRAMEを、次式 First, in NyuTsuta step SP21 from step SP20, the average power P FRAME per frame the maximum amplitude detecting unit 21 in the audio frame data S i [n] based on the following formula

【数4】 [Number 4] によつて求める。 Seek Te Niyotsu.

【0036】ステツプSP22において最大振幅検出部21では平均電力P FRAMEを基にフレーム当たりの平均振幅A av(FRAME)を、次式 The average amplitude A av per frame based on the maximum amplitude detecting unit 21 in the average power P FRAME In step SP22 the (FRAME), the following equation

【数5】 [Number 5] によつて求める。 Seek Te Niyotsu.

【0037】ステツプSP23において最大振幅検出部21では、平均振幅A av(FRAME)に対する最大振幅の比率である波高率a hを基に推定最大振幅A [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)を、次式 es the (FRAME), the following equation

【数6】 [6] によつて求める。 Seek Te Niyotsu.

【0038】このようにして最大振幅検出部21では1 [0038] In the maximum amplitude detecting unit 21 this way 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。 By by connexion dividing the integral of the sampled data for one frame to the number of samples, it calculates an average power per frame. 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。 After further sought connexion average amplitude and the maximum amplitude detecting unit 21 in the square root of the average power to obtain the maximum amplitude and by connexion dividing the average amplitude crest factor. この処理が終わるとステツプSP3に移り、当該ステツプSP3 Proceeds to step SP3 When this process is completed, the step 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。 In the up step SP14, the volume amplifier 7 switches the amplification factor in accordance with the magnitude of the maximum amplitude calculated from the average power, which amplifies the I connexion input speech to the amplification degree. 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。 That volume amplifier 7 is Gyotsu the same operation as to step SP14 from step SP3 of the flow chart 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。 Further in the embodiment described above has dealt with the case of applying the present invention to a portable telephone device, the present invention is not limited to this, by applying the present invention to a communication terminal apparatus having a transmitting and receiving means of audio it can provide the same effect as described above.

【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。 Effects of the Invention According to the present invention as described above, by which is adapted to determine an amplification degree according to the signal level of the input voice, can switch the amplification degree according to the signal level adaptively, It may be adjusted to facilitate optimum volume without the hassle for the user.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【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。 Is a block diagram showing a configuration of a mobile telephone device according to an embodiment of the present invention; FIG.

【図2】音量増幅器の内部構成を示すブロツク図である。 2 is a block diagram showing the internal structure of the volume amplifier.

【図3】音声増幅方法を示すフローチヤートである。 3 is a flow chart illustrating a voice 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。 4 is a flow chart illustrating a voice amplification method using the average power.

【符号の説明】 DESCRIPTION OF SYMBOLS

1……携帯電話装置、2……マイク、3……アナログ/ 1 ...... mobile phone device, 2 ...... microphone, 3 ...... analog /
デイジタル変換器、4……切換器、5……操作部、6… Digital converter, 4 ...... switcher, 5 ...... operation unit, 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 ... control unit, 7 ...... volume amplifier, 8 ...... speech encoder, 9 ...... channel encoder, 10 ...... modulator, 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。 2 ...... antenna, 14 ...... demodulator, 15 ...... channel decoder, 16 ...... speech decoder, 17 ...... digital / analog converter, 18 ...... speaker, 20 ...... volume amplification unit, 21 ...... maximum amplitude detection part, 22 ...... sound / silence detector, 23 ...... volume control unit.

Claims (21)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】入力音声を増幅する音声増幅装置において、 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音声増幅装置。 1. A sound amplification system for amplifying an input speech, the amplification degree determined according to the signal level of the input speech, in that it comprises a sound amplification means for amplifying the input speech based on the amplification degree audio amplification apparatus according to claim.
  2. 【請求項2】上記音声増幅手段は、 上記入力音声の最大振幅を検出する最大振幅検出手段と、 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。 Wherein said audio amplifier means, the maximum amplitude detection means and control means for determining the amplification factor based on the maximum amplitude have been conducted under detection to the maximum amplitude detecting means for detecting the maximum amplitude of the input speech If, audio amplification apparatus according to claim 1, characterized in that it comprises an amplifying means for amplifying the input speech based on the degree of amplification.
  3. 【請求項3】上記最大振幅検出手段は、 上記入力音声の所定サンプル数をフレームとし、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2に記載の音声増幅装置。 Wherein said maximum amplitude detection means, a predetermined number of samples of the input speech and frames, audio amplification apparatus according to claim 2, characterized in that to detect the maximum amplitude for each said frame.
  4. 【請求項4】上記最大振幅検出手段は、 上記入力音声の所定サンプル数をフレームとし、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2に記載の音声増幅装置。 Wherein said maximum amplitude detection means, sound according to claim 2, the predetermined number of samples of the input speech and the frame, and detects the maximum amplitude based on the average power in the frame amplifier.
  5. 【請求項5】上記最大振幅を基に上記入力音声が有音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、 5. comprises a voice activity detection means for said input speech based on the maximum amplitude is detected whether voiced or silence, if I go-between silence to the voice activity detection means is detected,
    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。 It said control means, audio amplification apparatus according to claim 2, characterized in that to determine the amplification degree so as not to amplify the input speech.
  6. 【請求項6】上記制御手段は、 上記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、 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。 Wherein said control means, when the maximum amplitude is less than the predetermined threshold, determines a predetermined amplification degree to a predetermined, if the maximum amplitude is larger than the predetermined threshold , the audio amplification device of claim 2 in which the maximum amplitude and decreases the predetermined amplification degree depending on the degree has exceeded than the predetermined threshold value.
  7. 【請求項7】上記制御手段は、 決定した上記増幅度をサンプリングデータ毎に平滑化す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 control unit, the audio amplifier according to the determined the amplification degree in claim 2, wherein the smoothing for each sampling data.
  8. 【請求項8】入力音声を増幅して送信する通信端末装置において、 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. The communication terminal device which transmits and amplifies the input speech, immediately the sound amplification means an amplification degree determined according to the signal level of the input speech, amplifies the input speech based on the amplification degree communication terminal and wherein the obtaining.
  9. 【請求項9】上記音声増幅手段は、 上記入力音声の最大振幅を検出する最大振幅検出手段と、 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 amplifying means, the maximum amplitude detection means and control means for determining the amplification factor based on the maximum amplitude have been conducted under detection to the maximum amplitude detecting means for detecting the maximum amplitude of the input speech When the communication terminal apparatus according to claim 8, characterized in that it comprises an amplifying means for amplifying the input speech based on the degree of amplification.
  10. 【請求項10】上記最大振幅検出手段は、 上記入力音声の所定サンプル数をフレームとし、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9に記載の通信端末装置。 10. The maximum amplitude detection means, the communication terminal apparatus of claim 9, the predetermined number of samples of the input speech and the frame, and detects the maximum amplitude for each said frame.
  11. 【請求項11】上記最大振幅検出手段は、 上記入力音声の所定サンプル数をフレームとし、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9に記載の通信端末装置。 11. The maximum amplitude detection means, communication of claim 9, the predetermined number of samples of the input speech and the frame, and detects the maximum amplitude based on the average power in the frame terminal equipment.
  12. 【請求項12】上記最大振幅を基に上記入力音声が有音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、 12. comprises a voice activity detection means for said input speech based on the maximum amplitude is detected whether voiced or silence, if I go-between silence to the voice activity detection means is detected,
    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。 It said control means, the communication terminal apparatus according to claim 9, characterized in that to determine the amplification degree so as not to amplify the input speech.
  13. 【請求項13】上記制御手段は、 上記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、 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 unit, when the maximum amplitude is less than the predetermined threshold, determines a predetermined amplification degree to a predetermined, if the maximum amplitude is larger than the predetermined threshold the communication terminal device according to claim 9 in which the maximum amplitude and decreases the predetermined amplification degree depending on the degree has exceeded than the predetermined threshold value.
  14. 【請求項14】上記制御手段は、 決定した上記増幅度をサンプリングデータ毎に平滑化す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 control means, the communication terminal apparatus according to determined the degree of amplification to claim 9, characterized in that the smoothing for each sampling data.
  15. 【請求項15】入力音声を増幅する音声増幅方法において、 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音声増幅することを特徴とする音声増幅方法。 15. The audio amplifying method for amplifying an input speech, audio amplification the amplification degree determined according to the signal level of the input speech, characterized by voice amplifying the input speech based on the amplification degree Method.
  16. 【請求項16】上記入力音声の最大振幅を検出した後、 16. After detecting the maximum amplitude of the input speech,
    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。 Audio amplification method according to claim 15, characterized in that the maximum amplification degree determined based on the amplitude, amplifying the input speech based on the determined the amplification degree.
  17. 【請求項17】上記入力音声の所定サンプル数をフレームとし、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 predetermined number of samples of the input speech and frames, audio amplification method according to claim 16, characterized in that to detect the maximum amplitude for each said frame.
  18. 【請求項18】上記入力音声の所定サンプル数をフレームとし、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 predetermined number of samples of the input speech and frames, audio amplification method according to claim 16, based on the average power in the frame and detects the maximum amplitude.
  19. 【請求項19】上記最大振幅を基に上記入力音声が有音か無音か検出し、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 input speech based on the maximum amplitude is detected whether voiced or silence, if silence is detected, and characterized by determining the amplification degree so as not to amplify the input speech audio amplification method according to claim 16.
  20. 【請求項20】上記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、 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。 When 20. The maximum amplitude is less than the predetermined threshold, it determines a predetermined amplification degree that is determined in advance, when the maximum amplitude is larger than the predetermined threshold value, the maximum audio amplification method according to claim 16 whose amplitude and decreases the predetermined amplification degree depending on the degree has exceeded than the predetermined threshold value.
  21. 【請求項21】決定した上記増幅度をサンプリングデー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. A sound amplification method of claim 16, the determined the amplification degree, characterized in that the smoothing for each sampling data.
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