JPH05115100A - Sound emphasis circuit - Google Patents
Sound emphasis circuitInfo
- Publication number
- JPH05115100A JPH05115100A JP3274236A JP27423691A JPH05115100A JP H05115100 A JPH05115100 A JP H05115100A JP 3274236 A JP3274236 A JP 3274236A JP 27423691 A JP27423691 A JP 27423691A JP H05115100 A JPH05115100 A JP H05115100A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- low
- audio signals
- circuit
- cut
- 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
Landscapes
- Stereophonic System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＶＴＲ、テープレコー
ダ等の音声再生装置に適用して好適な音声強調回路に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice emphasizing circuit suitable for use in a voice reproducing device such as a VTR or a tape recorder.
【０００２】[0002]
【従来の技術】従来の音声再生装置では、左及び右音声
信号Ｌ、Ｒに対し、それぞれ各チャンネル別のトーンコ
ントロール回路、グラフィックイコライザ等によって、
音質調整を行っていた。2. Description of the Related Art In a conventional audio reproducing apparatus, for left and right audio signals L and R, a tone control circuit for each channel, a graphic equalizer, etc.
I was adjusting the sound quality.
【０００３】[0003]
【発明が解決しようとする課題】このため、従来の音声
再生装置では、音質のバランスが崩れる虞があった。
又、ステレオマイクロフォンを備えたカメラ一体形ＶＴ
Ｒにおいて、左及び右音声信号Ｌ、Ｒを再生した場合、
ステレオマイクロフォンに対し、中央に位置する人の声
が、周囲の雑音でマスクされて聞き取り難い場合に、各
チャンネル別の音質調整を行っても、周囲の音の再生音
も変化してしまうため、中央に位置する人の声を聞き易
くすることができなかった。Therefore, in the conventional audio reproducing apparatus, the sound quality may be unbalanced.
In addition, a camera integrated VT equipped with a stereo microphone
In R, when the left and right audio signals L and R are reproduced,
For a stereo microphone, if the voice of the person in the center is masked by ambient noise and is difficult to hear, even if you adjust the sound quality for each channel, the reproduced sound of the surrounding sound will also change, It was not possible to make the voice of the person in the center easy to hear.
【０００４】かかる点に鑑み、本発明は、中央の人の声
を聞き易くすることのできる音声強調回路を提案しよう
とするものである。In view of the above point, the present invention intends to propose a voice emphasizing circuit capable of making the voice of a central person easy to hear.
【０００５】[0005]
【課題を解決するための手段】本発明による音声強調回
路は、左及び右音声信号Ｌ、Ｒの和音声信号Ｌ＋Ｒの中
域成分を増幅する中域抜き出し増幅器１と、左及び右音
声信号Ｌ、Ｒに中域抜き出し増幅器１の出力を加算する
左及び右加算器２、３とを有する。又、本発明による音
声強調回路は、これらの構成に加えて、左及び右加算器
２、３の出力側にそれぞれ低域カット回路４、５を設け
る。A speech enhancement circuit according to the present invention comprises a middle-range extraction amplifier 1 for amplifying a middle-range component of a sum sound signal L + R of left and right sound signals L and R, and a left and right sound signal L. , R, and left and right adders 2, 3 for adding the output of the mid-range extraction amplifier 1. In addition to these components, the voice emphasizing circuit according to the present invention is provided with low-frequency cut circuits 4 and 5 on the output sides of the left and right adders 2 and 3, respectively.
【０００６】[0006]
【作用】かかる本発明によれば、左及び右音声信号Ｌ、
Ｒに、その和音声信号Ｌ＋Ｒの中域成分の増幅されたも
のが加算されるので、左及び右音声を再生して聴取した
場合、中央の人の声が聞き易く成る。又、本発明によれ
ば、左及び右音声信号Ｌ、Ｒに、その和音声信号Ｌ＋Ｒ
の中域成分の増幅されたものが加算された各信号の低域
をそれぞれカットするので、左及び右音声を再生して聴
取した場合、低周波の雑音が抑圧されるて、中央の人の
声が一層聞き易く成る。According to the present invention, the left and right audio signals L,
Since the amplified mid-range component of the sum audio signal L + R is added to R, when the left and right sounds are reproduced and listened to, the voice of the person in the center becomes easy to hear. Further, according to the present invention, the sum audio signal L + R is added to the left and right audio signals L and R.
The low-frequency noise is suppressed when the left and right sounds are played back and listened to, because the low-frequency band of each signal to which the amplified mid-range component is added is cut respectively. The voice becomes easier to hear.
【０００７】[0007]
【実施例】以下に、図１及び図２を参照して、本発明を
カメラ一体形ＶＴＲの再生系の出力ライン増幅部に適用
した実施例を詳細に説明する。図１はその実施例の基本
構成をブロック線図で図示したものであり、図２はその
実施例の具体構成を回路図で図示したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an output line amplifier section of a reproducing system of a camera-integrated VTR will be described in detail below with reference to FIGS. FIG. 1 is a block diagram showing the basic constitution of the embodiment, and FIG. 2 is a circuit diagram showing the concrete constitution of the embodiment.
【０００８】入力端子ＴＬ１、ＴＲ１からの左及び右音
声信号Ｌ、Ｒが中域抜き出し増幅器１に供給されると共
に、左及び右加算器２、３にそれぞれ供給され、加算器
２、３において、左及び右音声信号Ｌ、Ｒに、増幅器１
の出力、即ち、和音声信号Ｌ＋Ｒの中域成分が加算され
る。加算器２、３の各出力は左及び右低域カット回路
（ハイパスフィルタ）４、５に供給されて、それぞれ低
域成分がカットされた後、低周波増幅器（バッファ増幅
器であっても良い）Ａ１，Ａ２に供給されて増幅され、
それぞれ左及び右出力端子ＴＬＯ、ＴＲＯに導出され
る。The left and right audio signals L and R from the input terminals TL1 and TR1 are supplied to the mid-range extraction amplifier 1 and also to the left and right adders 2 and 3, respectively. Amplifier 1 for left and right audio signals L, R
Output, that is, the mid-range component of the sum audio signal L + R is added. The outputs of the adders 2 and 3 are supplied to the left and right low-pass cut circuits (high-pass filters) 4 and 5 to cut low-pass components, respectively, and then a low-frequency amplifier (may be a buffer amplifier). It is supplied to A1 and A2 and amplified,
These are led to the left and right output terminals TLO and TRO, respectively.
【０００９】中域抜き出し増幅器１は、左及び右音声信
号Ｌ、Ｒから、和音声信号Ｌ＋Ｒの、人間の声の周波数
帯域に略等しい周波数帯域（例えば、５００Ｈｚ〜５ｋ
Ｈｚ、１ｋＨｚ〜３ｋＨｚ等）の音声信号成分を抜き出
して増幅する回路である。Ａ３は非反転増幅器（演算増
幅器）で、その出力端子及び反転入力端子間に接続され
た抵抗器Ｒ３並びに反転入力端子及び接地間に接続され
た抵抗器Ｒ４の抵抗の比で増幅率（例えば、＋８ｄＢ）
が決定される。The mid-range extraction amplifier 1 has a frequency band (for example, 500 Hz to 5 k) substantially equal to the frequency band of the human voice of the sum audio signal L + R from the left and right audio signals L and R.
It is a circuit for extracting and amplifying audio signal components of Hz, 1 kHz to 3 kHz). A3 is a non-inverting amplifier (operational amplifier), which has an amplification factor (for example, a ratio of resistance of a resistor R3 connected between its output terminal and its inverting input terminal and a resistor R4 connected between its inverting input terminal and ground). +8 dB)
Is determined.
【００１０】入力端子ＴＬＩ、ＴＲＩが、それぞれ低域
カット回路（上述の例では、低域カット周波数はそれぞ
れ５００Ｈｚ、１ＫＨｚ）（ハイパスフィルタ）を構成
するコンデンサＣ１及び抵抗器Ｒ１の直列回路並びにコ
ンデンサＣ２及び抵抗器Ｒ２の直列回路をそれぞれ通じ
て、増幅器Ａ１の非反転入力端子に共通に接続される。
ここで、抵抗器Ｒ１、Ｒ２は左及び右音声信号Ｌ、Ｒ
を、１：１で加算する加算器６を構成する。尚、この加
算器６は、増幅器１とは別に設けても良い。増幅器Ａ３
の出力端子には、高域カット回路（上述の例では、高域
カット周波数はそれぞれ５ｋＨｚ、３ｋＨｚ）（ローパ
スフィルタ）を構成する抵抗器Ｒ５及びコンデンサＣ３
の逆Ｌ字形回路が接続される。尚、コンデンサＣ３の一
端は抵抗器Ｒ５に接続され、他端は接地される。そし
て、コンデンサＣ３に並列にスイッチング用トランジス
タ（ＮＰＮ形トランジスタ）Ｑ１のコレクタ及びエミッ
タ間が接続される。このトランジスタＱ１がオフのとき
は、この中域抜き出し増幅器１は動作状態に成り、オン
の時は非動作状態に成る。The input terminals TLI and TRI constitute a low-frequency cut circuit (in the above example, low-frequency cut frequencies are 500 Hz and 1 KHz, respectively) (high-pass filter), a series circuit of a capacitor C1 and a resistor R1, and a capacitor C2. And a resistor R2 connected in series, and commonly connected to the non-inverting input terminal of the amplifier A1.
Here, the resistors R1 and R2 are the left and right audio signals L and R, respectively.
The adder 6 that adds 1: 1 is configured. The adder 6 may be provided separately from the amplifier 1. Amplifier A3
A resistor R5 and a capacitor C3 forming a high frequency cut circuit (high frequency cut frequencies are 5 kHz and 3 kHz respectively in the above example) (low-pass filter) are connected to the output terminal of
The inverted L-shaped circuit of is connected. Incidentally, one end of the capacitor C3 is connected to the resistor R5 and the other end is grounded. The collector and emitter of a switching transistor (NPN type transistor) Q1 are connected in parallel with the capacitor C3. When the transistor Q1 is off, the mid-range extraction amplifier 1 is in operation, and when it is on, it is in operation.
【００１１】低周波増幅器Ａ１、Ａ２はそれぞれ非反転
増幅器で、それぞれその出力端子及び反転入力端子間に
接続された抵抗器Ｒ１４、Ｒ１６及び反転入力端子及び
接地間に接続された抵抗器Ｒ１５、Ｒ１７で増幅率が決
定され、その各出力端子はそれぞれ出力端子ＴＬＯ、Ｔ
ＲＯに接続される。The low-frequency amplifiers A1 and A2 are non-inverting amplifiers, and resistors R14 and R16 connected between their output terminals and inverting input terminals and resistors R15 and R17 connected between their inverting input terminals and ground, respectively. The amplification factor is determined by, and its output terminals are respectively output terminals TLO, T
Connected to RO.
【００１２】左及び右低域カット回路４、５の低域カッ
ト周波数は、中域抜き出し増幅器１の通過帯域周波数が
５００Ｈｚ〜５ｋＨｚの場合は、４００Ｈｚ、１ｋＨｚ
〜３ｋＨｚの場合は、９００Ｈｚとされる。The low-pass cut frequencies of the left and right low-pass cut circuits 4 and 5 are 400 Hz and 1 kHz when the pass band frequency of the mid-range extraction amplifier 1 is 500 Hz to 5 kHz.
In the case of ˜3 kHz, it is set to 900 Hz.
【００１３】左低域カット回路４においては、入力端子
ＴＬＩ及び増幅器Ａ１の非反転入力端子間に抵抗器Ｒ６
が接続され、増幅器１の抵抗器Ｒ５及びコンデンサＣ３
の接続中点並びに増幅器Ａ１の非反転入力端子間に抵抗
器Ｒ７が接続され、抵抗器Ｒ６、Ｒ７の接続中点が、互
いに等しい抵抗値の抵抗器Ｒ１０、Ｒ１１の直列回路を
通じて、増幅器Ａ１の反転入力端子に接続され、抵抗器
Ｒ１０、Ｒ１１の接続中点及び接地間にコイル（シュミ
レーテッドインダクタも可）Ｌ１が接続され、その低域
カット周波数は抵抗器Ｒ６、Ｒ７の抵抗値及びコイルＬ
１のインダクタンスで決定される。In the left low cut circuit 4, a resistor R6 is provided between the input terminal TLI and the non-inverting input terminal of the amplifier A1.
Is connected to the resistor R5 and the capacitor C3 of the amplifier 1.
A resistor R7 is connected between the connection middle point of the amplifier A1 and the non-inverting input terminal of the amplifier A1, and the connection middle point of the resistors R6 and R7 is connected through a series circuit of resistors R10 and R11 having the same resistance value to each other. A coil (a simulated inductor is also possible) L1 is connected between the connection midpoint of the resistors R10 and R11 and the ground, and the low cut frequency is the resistance value of the resistors R6 and R7 and the coil L.
It is determined by the inductance of 1.
【００１４】抵抗器Ｒ６、Ｒ７は左音声信号Ｌに増幅器
１の出力を加算する左加算器２を構成し、例えば、抵抗
器Ｒ７を可変抵抗器として、加算比（混合比）を可変す
ることできる。尚、この加算器２は低域カット回路４と
は別に設けても良い。抵抗器Ｒ６、Ｒ７の接続中点と、
抵抗器Ｒ１０、Ｒ１１の接続中点との間に、スイッチン
グ用電界効果トランジスタ（ｎチャンネル形）Ｑ１のド
レイン及びソース間を接続する。このトランジスタＱ１
がオンのときは、コイルＬ１が増幅器Ａ１の非反転入力
端子及び接地間に接続されるため、低域カット回路４が
動作状態に成る。トランジスタＱ１がオフのときは、抵
抗器Ｒ１０、Ｒ１１の抵抗値が互いに等しいので、コイ
ルＬ１は増幅器Ａ１の非反転及び反転入力端子に対する
インピーダンス的な中点と成るので、低域カット回路４
は非動作状態に成る。The resistors R6 and R7 constitute a left adder 2 for adding the output of the amplifier 1 to the left audio signal L. For example, the resistor R7 is a variable resistor and the addition ratio (mixing ratio) is variable. it can. The adder 2 may be provided separately from the low frequency cut circuit 4. Middle point of connection of resistors R6 and R7,
The drain and source of the switching field effect transistor (n-channel type) Q1 are connected between the resistors R10 and R11 and the connection midpoint. This transistor Q1
When is on, the coil L1 is connected between the non-inverting input terminal of the amplifier A1 and the ground, so that the low-frequency cut circuit 4 is activated. When the transistor Q1 is off, the resistances of the resistors R10 and R11 are equal to each other, and the coil L1 serves as an impedance midpoint for the non-inverting and inverting input terminals of the amplifier A1.
Becomes inactive.
【００１５】又、右低域カット回路５においては、入力
端子ＴＲＩ及び増幅器Ａ２の非反転入力端子間に抵抗器
Ｒ８が接続され、増幅器１の抵抗器Ｒ５及びコンデンサ
Ｃ３の接続中点並びに増幅器Ａ２の非反転入力端子間に
抵抗器Ｒ９が接続され、抵抗器Ｒ８、Ｒ９の接続中点
が、互いに等しい抵抗値の抵抗器Ｒ１２、Ｒ１３の直列
回路を通じて、増幅器Ａ２の反転入力端子に接続され、
抵抗器Ｒ１２、Ｒ１３の接続中点及び接地間にコイル
（シュミレーテッドインダクタも可）Ｌ２が接続され、
その低域カット周波数は抵抗器Ｒ８、Ｒ９の抵抗値及び
コイルＬ２のインダクタンスで決定される。Further, in the right low-frequency cut circuit 5, a resistor R8 is connected between the input terminal TRI and the non-inverting input terminal of the amplifier A2, and the connecting midpoint of the resistor R5 and the capacitor C3 of the amplifier 1 and the amplifier A2. A resistor R9 is connected between the non-inverting input terminals of, and the connection midpoint of the resistors R8 and R9 is connected to the inverting input terminal of the amplifier A2 through a series circuit of resistors R12 and R13 having the same resistance value.
A coil (also a simulated inductor) L2 is connected between the connection midpoint of the resistors R12 and R13 and the ground,
The low cut frequency is determined by the resistance values of the resistors R8 and R9 and the inductance of the coil L2.
【００１６】抵抗器Ｒ８、Ｒ９は右音声信号Ｒに増幅器
１の出力を加算する右加算器３を構成し、例えば、抵抗
器Ｒ９を可変抵抗器として、加算比（混合比）を可変す
ることできる。尚、この加算器３は低域カット回路５と
は別に設けても良い。抵抗器Ｒ８、Ｒ９の接続中点と、
抵抗器Ｒ１２、Ｒ１３の接続中点との間に、スイッチン
グ用電界効果トランジスタ（ｎチャンネル形）Ｑ３のド
レイン及びソース間を接続する。このトランジスタＱ３
がオンのときは、コイルＬ２が増幅器Ａ２の非反転入力
端子及び接地間に接続されるため、低域カット回路５が
動作状態に成る。トランジスタＱ２がオフのときは、抵
抗器Ｒ１２、Ｒ１３の抵抗値が互いに等しいので、コイ
ルＬ２は増幅器Ａ２の非反転及び反転入力端子に対する
インピーダンス的な中点と成るので、低域カット回路５
は非動作状態に成る。The resistors R8 and R9 constitute a right adder 3 for adding the output of the amplifier 1 to the right audio signal R. For example, the resistor R9 is a variable resistor and the addition ratio (mixing ratio) is variable. it can. The adder 3 may be provided separately from the low frequency cut circuit 5. Middle point of connection of resistors R8 and R9,
The drain and source of the switching field effect transistor (n-channel type) Q3 are connected between the resistors R12 and R13 and the connection midpoint. This transistor Q3
When is on, the coil L2 is connected between the non-inverting input terminal of the amplifier A2 and the ground, so that the low-frequency cut circuit 5 is activated. When the transistor Q2 is off, the resistances of the resistors R12 and R13 are equal to each other, and the coil L2 serves as an impedance midpoint for the non-inverting and inverting input terminals of the amplifier A2.
Becomes inactive.
【００１７】さて、上述のスイッチング用トランジスタ
Ｑ１、Ｑ２、Ｑ３は互い連動して動作するように制御さ
れる。即ち、スイッチング信号の入力端子Ｔが抵抗器Ｒ
２１を通じてトランジスタＱ１のベースに接続される共
に、抵抗器Ｒ１８を通じてトランジスタ（ＰＮＰ形トラ
ンジスタ）Ｑ４のベースに接続される。トランジスタＱ
４のエミッタが正電源＋Ｂに接続され、そのコレクタが
抵抗器Ｒ１９、２０直列回路を通じて負電源−Ｂに接続
されると共に、抵抗器Ｒ１９、Ｒ２０の接続中点が電界
効果トランジスタＱ２、Ｑ３のゲートに共通に接続され
る。The switching transistors Q1, Q2 and Q3 are controlled so as to operate in conjunction with each other. That is, the input terminal T of the switching signal is the resistor R
21 and the base of a transistor Q1 through a resistor R18 and the base of a transistor (PNP transistor) Q4 through a resistor R18. Transistor Q
The emitter of 4 is connected to the positive power supply + B, the collector is connected to the negative power supply -B through the series circuit of the resistors R19 and 20, and the connection midpoint of the resistors R19 and R20 is the gate of the field effect transistors Q2 and Q3. Commonly connected to.
【００１８】入力端子Ｔに接地電圧が与えられていると
きは、スイッチング用トランジスタＱ１はオフ、Ｑ２、
Ｑ３はオンと成って、中域抜き出し増幅器１及び低域カ
ット回路４、５は共に動作状態と成る。又、入力端子Ｔ
に正の電圧が与えられているときは、スイッチング用ト
ランジスタＱ１はオン、Ｑ２、Ｑ３はオフと成って、中
域抜き出し増幅器１及び低域カット回路４、５は共に非
動作状態と成る。When the ground voltage is applied to the input terminal T, the switching transistor Q1 is off, Q2,
Q3 is turned on, and the middle frequency band extraction amplifier 1 and the low frequency band cut circuits 4 and 5 are both in operation. Also, the input terminal T
When a positive voltage is applied to the switching transistor Q1, the switching transistor Q1 is turned on, Q2 and Q3 are turned off, and the middle frequency band extraction amplifier 1 and the low frequency band cut circuits 4 and 5 are inactive.
【００１９】尚、中域抜き出し増幅器１における低域カ
ット回路及び高域カット回路を構成する抵抗器又はコン
デンサを可変素子にして、低域及び高域カット周波数を
可変し得るようにしても良い。又、低域カット回路４、
５を構成する抵抗器又はコイルを可変素子にして低域カ
ット周波数を可変し得るようにしても良い。The low-frequency cut circuit and the high-frequency cut circuit in the mid-frequency extraction amplifier 1 may be configured with variable resistors or capacitors to change the low-frequency and high-frequency cut frequencies. Also, the low frequency cut circuit 4,
The resistor or coil forming 5 may be a variable element so that the low frequency cut frequency can be varied.
【００２０】[0020]
【発明の効果】上述せる本発明音声強調回路によれば、
左及び右音声信号Ｌ、Ｒの和音声信号Ｌ＋Ｒの中域成分
を増幅する中域抜き出し増幅器と、左及び右音声信号
Ｌ、Ｒに中域抜き出し増幅器の出力を加算する左及び右
音声加算器とを有するので、中央の人の声を聞き易くす
ることができる。According to the speech enhancement circuit of the present invention described above,
A mid-range extraction amplifier that amplifies the middle range component of the sum sound signal L + R of the left and right sound signals L and R, and a left and right sound adder that adds the outputs of the middle range extraction amplifier to the left and right sound signals L and R Since it has and, the voice of the person in the center can be easily heard.
【００２１】又、本発明音声強調回路によれば、更に左
及び右音声加算器の出力側にそれぞれ低域カット回路を
設けたので、風切り音、装置操作時の音等の低域の雑音
が低減されて、中央の人の声を一層聞き易くすることが
できる。Further, according to the voice emphasizing circuit of the present invention, low-frequency cut circuits are further provided on the output sides of the left and right voice adders, respectively, so that low-frequency noises such as wind noise and sound when the device is operated are generated. It can be reduced to make it easier to hear the voice of the person in the center.
【図１】本発明の実施例の基本的構成を示すブロック線
図FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.
【図２】その実施例の具体構成を示す回路図FIG. 2 is a circuit diagram showing a specific configuration of the embodiment.
【符号の説明】 １ 中域抜き出し増幅器 ２ 左加算器 ３ 右加算器 ４ 左低域カット回路 ５ 右低域カット回路[Explanation of Codes] 1 mid-range extraction amplifier 2 left adder 3 right adder 4 left low-frequency cut circuit 5 right low-frequency cut circuit
Claims (2)
＋Ｒの中域成分を増幅する中域抜き出し増幅器と、 上記左及び右音声信号Ｌ、Ｒに上記中域抜き出し増幅器
の出力を加算する左及び右加算器とを有することを特徴
とする音声強調回路。1. A sum audio signal L of left and right audio signals L and R.
A voice emphasizing circuit having a middle band extracting amplifier for amplifying a middle band component of + R, and a left and right adder for adding the outputs of the middle band extracting amplifier to the left and right audio signals L and R. ..
低域カット回路を設けたことを特徴とする上記請求項１
に記載の音声強調回路。2. The low-frequency cut circuit is provided on each of the output sides of the left and right adders.
Speech enhancement circuit described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27423691A JP3198558B2 (en) | 1991-10-22 | 1991-10-22 | Voice enhancement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27423691A JP3198558B2 (en) | 1991-10-22 | 1991-10-22 | Voice enhancement circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05115100A true JPH05115100A (en) | 1993-05-07 |
| JP3198558B2 JP3198558B2 (en) | 2001-08-13 |
Family
ID=17538902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27423691A Expired - Fee Related JP3198558B2 (en) | 1991-10-22 | 1991-10-22 | Voice enhancement circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3198558B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771296A (en) * | 1994-11-17 | 1998-06-23 | Matsushita Electric Industrial Co., Ltd. | Audio circuit |
| KR20020035664A (en) * | 2000-11-07 | 2002-05-15 | 곽외수 | Enhancer circuit of sound with mic input |
| KR20020043369A (en) * | 2000-12-04 | 2002-06-10 | 곽외수 | Mic signal and sound signal output circuit |
| KR20040048104A (en) * | 2002-12-02 | 2004-06-07 | 주식회사 쓰리에스테크놀로지 | 3D Audio Processing System for the Portable Equipment |
| JP2009194877A (en) * | 2008-02-18 | 2009-08-27 | Sharp Corp | Audio signal transforming apparatus, audio signal transforming method, control program, and computer-readable recording medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461207B (en) | 2009-05-29 | 2015-04-22 | 夏普株式会社 | Voice reproduction device, voice reproduction method, and recording medium |
-
1991
- 1991-10-22 JP JP27423691A patent/JP3198558B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771296A (en) * | 1994-11-17 | 1998-06-23 | Matsushita Electric Industrial Co., Ltd. | Audio circuit |
| KR20020035664A (en) * | 2000-11-07 | 2002-05-15 | 곽외수 | Enhancer circuit of sound with mic input |
| KR20020043369A (en) * | 2000-12-04 | 2002-06-10 | 곽외수 | Mic signal and sound signal output circuit |
| KR20040048104A (en) * | 2002-12-02 | 2004-06-07 | 주식회사 쓰리에스테크놀로지 | 3D Audio Processing System for the Portable Equipment |
| JP2009194877A (en) * | 2008-02-18 | 2009-08-27 | Sharp Corp | Audio signal transforming apparatus, audio signal transforming method, control program, and computer-readable recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3198558B2 (en) | 2001-08-13 |
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| Date | Code | Title | Description |
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| LAPS | Cancellation because of no payment of annual fees |