JPS63102516A - Vocoder - Google Patents
VocoderInfo
- Publication number
- JPS63102516A JPS63102516A JP24884386A JP24884386A JPS63102516A JP S63102516 A JPS63102516 A JP S63102516A JP 24884386 A JP24884386 A JP 24884386A JP 24884386 A JP24884386 A JP 24884386A JP S63102516 A JPS63102516 A JP S63102516A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase difference
- level difference
- signals
- sent
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000005236 sound signal Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 238000005314 correlation function Methods 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
Landscapes
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
２個のマイクロホンでステレオ収録した相関の非常に強
い両チャンネルの信号を受信側に送り、受信側で再生し
、ステレオ信号として臣ｎ場惑のある音声を聞かせるよ
うにする場合、送信信号として両チャンネルの信号をモ
ノラル化した信号と、両チャンネルの位相差及びレベル
差を送るようにすることで、低ビツトレートの伝送を可
能にしたものである。[Detailed Description of the Invention] [Summary] The signals of both channels, which are stereo-recorded with two microphones and have a very strong correlation, are sent to the receiving side and reproduced on the receiving side, and the confusing sound is output as a stereo signal. When the signal is to be heard, low bit rate transmission is made possible by sending as a transmission signal a monauralized signal of both channels and the phase difference and level difference between the two channels.
本発明は、ＴＶ会議システム、音声会議システム等に用
いる、２個のマイクロホンでステレオ収録した相関の非
常に強い両チャンネルの信号を受信側に送り、受信側で
再生し、ステレオ信号として臨場感のある音声を聞かせ
るようにする場合の音声符号化装置に関する。The present invention is used in TV conference systems, audio conference systems, etc., and sends the signals of both channels, which are recorded in stereo with two microphones and have a very strong correlation, to the receiving side, reproduces them on the receiving side, and reproduces them as stereo signals that give a sense of realism. The present invention relates to a voice encoding device for making certain voices heard.
上記の場合、回線を有効に利用するために、出来るだけ
低ビツトレートで送信出来ることが望ましい。In the above case, it is desirable to be able to transmit at as low a bit rate as possible in order to use the line effectively.
〔従来の技術と発明が解決しようとする問題点〕２個の
マイクロホンでステレオ収録した相関の非常に強い両チ
ャンネルの信号を受信側に送り、受信側で再生し、ステ
レオ信号として臨場感のある音声を聞かせるようにする
場合、従来は、両チャンネルの信号を別々に伝送してい
た。[Problems to be solved by the conventional technology and the invention] The signals of both channels, which are recorded in stereo with two microphones and have a very strong correlation, are sent to the receiving side and reproduced on the receiving side, giving a sense of presence as a stereo signal. Conventionally, when making audio audible, the signals of both channels were transmitted separately.
従って、伝送ビットレートが高くなる問題点がある。Therefore, there is a problem that the transmission bit rate becomes high.
上記問題点は、第１図の原理ブロック図に示す如く、２
個のマイクロホン１．２でステレオ収録した両チャンネ
ル信号の、レベル差検出手段３にて検出したレベル差と
、
位相差検出手段４にて検出した位相差と、該両チャンネ
ルの信号を、加算器５にて加算しモノラル化し符号器６
により符号化した信号とを、多重化回路７にて多重化し
て受信側に送信するようにした本発明の音声符号化装置
により解決される。The above problem can be solved by two steps, as shown in the principle block diagram of Fig.
The level difference detected by the level difference detection means 3, the phase difference detected by the phase difference detection means 4, and the signals of both channels, which are stereo-recorded by the microphones 1.2, are added to an adder. Addition is made in step 5, converted to monaural, and encoder 6
This problem is solved by the speech encoding device of the present invention, which multiplexes the encoded signals using the multiplexing circuit 7 and transmits the encoded signals to the receiving side.
本発明によれば、両チャンネルの信号をモノラル化し符
号化した信号と、両チャンネルの信号の位相差及びレベ
ル差を送るのみで、受信側で再生し、ステレオ信号とす
るので、伝送ビットレートを低（することが出来る。According to the present invention, the signals of both channels are converted to monaural and encoded, and only the phase difference and level difference between the signals of both channels are sent, and the signal is reproduced on the receiving side as a stereo signal, so that the transmission bit rate can be reduced. Low (can be done)
以下本発明の実施例に付き、図に従って説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第２図は本発明の実施例のブロック図、第３図は第２図
に対応した受信側のブロック図である。FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of a receiving side corresponding to FIG.
第２図では、マイクロホン１，２でステレオ収録した音
声を、アナログ・ディジタル変換器８゜９にて夫々ディ
ジタル化し、電力計算部１０，１■及び位相差検出器４
．加算器５に送り、電力計算部１０．１１にて夫々電力
を計算し、レベル差検出部１２にて、例えばマイクロホ
ン１側の信号を基準として、レベル差を検出し、レベル
差を多重化回路７に送る。In FIG. 2, audio recorded in stereo by microphones 1 and 2 is digitized by analog-to-digital converters 8.
．． The power is sent to the adder 5, the power calculation units 10 and 11 calculate the power, the level difference detection unit 12 detects the level difference using, for example, the signal from the microphone 1 side as a reference, and the level difference is sent to the multiplexing circuit. Send to 7.
位相差検出器４では、同じくマイクロホン１例の信号を
基準として、相互相関関数を計算し、値の、最大値を与
える相関次数を信号量位相差とすることで、位相差を検
出し、位相差を多重化回路７に送る。The phase difference detector 4 also calculates the cross-correlation function using the signal of one example of the microphone as a reference, and detects the phase difference by using the correlation order that gives the maximum value as the signal quantity phase difference. The phase difference is sent to the multiplexing circuit 7.
加算器５では、両チャンネルの信号を加算し、モノラル
信号とし、符号器６にて符号化し、多重化回路７に送り
、位相差、レベル差と多重化して受信側に送る。The adder 5 adds the signals of both channels to form a monaural signal, which is encoded by the encoder 6, sent to the multiplexing circuit 7, multiplexed with phase difference and level difference, and sent to the receiving side.
尚電力計算部１０．１１とレベル差検出部１２にてレベ
ル差検出手段３を構成している。Note that the power calculation section 10.11 and the level difference detection section 12 constitute a level difference detection means 3.
受信側では、第３図に示す如く、分離回路２０にて、位
相差、レベル差、符号化した信号に分離し、符号化した
信号は復号器２３にて復号化してモノラル信号とし、可
変移相器２１．２２に入力し、乗算器２４．２５を経て
、ディジタル・アナログ変換器２６．２７にてアナログ
信号に変換してスピーカ２８．２９にてステレオ信号と
して出力する。On the receiving side, as shown in FIG. 3, a separation circuit 20 separates the signal into phase difference, level difference, and coded signals, and the coded signal is decoded by a decoder 23 to become a monaural signal, which is converted into a variable shift signal. The signals are inputted to phase shifters 21 and 22, passed through multipliers 24 and 25, converted into analog signals by digital-to-analog converters 26 and 27, and output as stereo signals from speakers 28 and 29.
この場合、位相差は、可変移相器２１．２２に送られ、
可変移相器２１側を基準とし、位相差が十の時は可変移
相器２２にて位相差を与え、−の時は、可変移相器２１
にて位相差を与え、又レベル差は乗算器２４．２５に送
られ、１より小さい時は乗算器２５にて乗算し、１より
大きい時は逆数を乗算器２４にて乗算することで、マイ
クロホン１側を基準にして両チャンネルの信号が再生さ
れ、マイクロホン１側はスピーカ２８より、マイクロホ
ン２側はスピーカ２９より出力され、ステレオ信号とし
て出力することになる。In this case, the phase difference is sent to a variable phase shifter 21.22,
Based on the variable phase shifter 21 side, when the phase difference is 0, the variable phase shifter 22 gives a phase difference, and when it is -, the variable phase shifter 21 side gives the phase difference.
gives a phase difference, and the level difference is sent to multipliers 24 and 25, and when it is smaller than 1, it is multiplied by the multiplier 25, and when it is larger than 1, it is multiplied by the reciprocal, so that The signals of both channels are reproduced with the microphone 1 side as a reference, and the microphone 1 side is output from the speaker 28, and the microphone 2 side is output from the speaker 29, and is output as a stereo signal.
従って、送信側より送信する信号はモノラル信号を符号
化した信号と、位相差、レベル差となるので、低ビツト
レートで伝送することが出来る。Therefore, the signal transmitted from the transmitting side has a phase difference and a level difference from the signal obtained by encoding the monaural signal, so that it can be transmitted at a low bit rate.
次に、人間の耳の音源の方向決定要因としては、例えば
ＩＫＨｚ〜３ＫＨｚ程度を境として、低域では位相差に
敏感であり、高域ではレベル差に敏感である点に着目し
、低域、高域に分割して位相差、レベル差を求めこれを
送信する場合につき説明する。Next, we focused on the fact that the human ear is sensitive to phase differences in the low range and sensitive to level differences in the high range, for example, with a boundary between IKHz and 3KHz as a factor that determines the direction of the sound source. , the case where the phase difference and level difference are determined and transmitted by dividing the signal into high frequencies will be explained.
第４図は本発明の他の実施例のブロック図、第５図は第
４図に対応した受信側のブロック図である。FIG. 4 is a block diagram of another embodiment of the present invention, and FIG. 5 is a block diagram of the receiving side corresponding to FIG.
第４図で第２図の場合と異なる点は、両チャンネル信号
を、ハイパスフィルタ１３．ローパスフィルタ１４及び
ハイパスフィルタ１５．ローパスフィルタ１６にて、例
えば２ＫＨｚを境として低域、高域に分割し、高域側で
、第２図の場合と同様の方法でレベル差検出手段３゛に
てレベル差を検出し、低域側では、第２図の場合と同様
の方法で位相差検出器４゛にて位相差を検出するように
した点である。The difference in FIG. 4 from the case in FIG. 2 is that both channel signals are filtered through the high-pass filter 13. Low pass filter 14 and high pass filter 15. The low-pass filter 16 divides the frequency into low and high frequencies, for example, with 2 kHz as the boundary, and on the high-frequency side, the level difference detection means 3' detects the level difference in the same manner as in the case of FIG. On the area side, the phase difference is detected by the phase difference detector 4' in the same manner as in the case of FIG.
従って多重化回路７よりは、モノラル化し符号化された
信号と、上記で求めたレベル差及び位相差を多重化して
受信側に送信する。Therefore, the multiplexing circuit 7 multiplexes the monaural encoded signal and the level difference and phase difference determined above and transmits the multiplexed signal to the receiving side.
受信側は、第５図に示す如くであり、分離回路２０にて
分離された符号化された信号は、復号器２３にて復号化
されモノラル信号となり、ローパスフィルタ３０．ハイ
パスフィルタ３１にて、低域と高域に分割され、低域側
は可変移相器２１”２２°にて第３図の場合と同様にし
て位相差を与えられ、高域側は、乗算器２４′、２５゛
にて第３図の場合と同様にしてレベル差を与えられ、こ
れ等は加算器３３にて加算され、ディジタル・アナログ
変換器２６．２７にてアナログ信号となり、スピーカ２
８．２９よりステレオ信号として出力される。The receiving side is as shown in FIG. 5, where the encoded signal separated by the separation circuit 20 is decoded by the decoder 23 to become a monaural signal, and the signal is passed through the low-pass filter 30. The high-pass filter 31 divides the band into a low band and a high band, and the low band is given a phase difference by the variable phase shifter 21"22° in the same way as in the case of Fig. 3, and the high band is multiplied. Level differences are given by the converters 24' and 25' in the same way as in the case of FIG.
8.29, it is output as a stereo signal.
この場合も、第２図の場合と同様に、送信側より送信す
る信号はモノラル信号を符号化した信号と、位相差、レ
ベル差となるので、低ビツトレートで伝送することが出
来る。In this case, as in the case of FIG. 2, the signal transmitted from the transmitting side has a phase difference and a level difference from the signal obtained by encoding the monaural signal, so that it can be transmitted at a low bit rate.
以上詳細に説明せる如く本発明によれば、２個のマイク
ロホンでステレオ収録した相関の非常に強い両チャンネ
ルの信号を受信側に送り、受信側で再生し、ステレオ信
号として臨場感のある音声を聞かせるようにする場合、
送信側より送信する信号はモノラル信号を符号化した信
号と、位相差。As explained in detail above, according to the present invention, the signals of both channels, which are stereo-recorded with two microphones and have a very strong correlation, are sent to the receiving side, and reproduced on the receiving side, producing realistic sound as stereo signals. If you want to hear it,
The signal sent from the transmitting side has a phase difference from the encoded monaural signal.
レベル差となるので、低ビツトレートで伝送することが
出来る効果がある。Since there is a level difference, there is an effect that transmission can be performed at a low bit rate.
第１図は本発明の原理ブロック図、
第２図は本発明の実施例のブロック図、第３図は第２図
に対応した受信側のブロック図、第４図は本発明の他の
実施例のブロック図、第５図は第４図に対応した受信側
のブロック図である。
図において、
１．２はマイクロホン、
３．３゛ はレベル差検出手段、
４．４゛は位相差検出手段５位相差検出器、５は加算器
、
６は符号器、
７は多重化回路、
８．９はアナログ・ディジタル変換器、１０．１１は電
力計算部、
１２はレベル差検出部を示す。
本発明の原理プロ・７７目
寮 １ 固
水￥＞朗の尼も＃゛（／ｌｆ口・１７図茎２ 目
Ｚ）
Ｔ＝ ２ Ｅｌ＋；対、ｉｔｒ；＊イ５イＪｔｆ 、Ｑ
フロ・ノクム１竿３閉Figure 1 is a block diagram of the principle of the present invention, Figure 2 is a block diagram of an embodiment of the present invention, Figure 3 is a block diagram of the receiving side corresponding to Figure 2, and Figure 4 is another embodiment of the present invention. An example block diagram, FIG. 5, is a block diagram of the receiving side corresponding to FIG. 4. In the figure, 1.2 is a microphone, 3.3 is a level difference detection means, 4.4 is a phase difference detection means 5, a phase difference detector, 5 is an adder, 6 is an encoder, 7 is a multiplexing circuit, 8.9 is an analog-to-digital converter, 10.11 is a power calculation section, and 12 is a level difference detection section. Principle of the present invention / 77th dormitory 1 Hard water ￥ > Ro no Ni mo # ゛ (/lf mouth/17 figure stem 2 Z) T= 2 El+; Vs., itr; *I 5 I Jtf, Q
Flo Nocum 1 rod 3 closed
Claims (1)
た両チャンネル信号の、レベル差検出手段（３）にて検
出したレベル差と、 位相差検出手段（４）にて検出した位相差と、該両チャ
ンネルの信号を、加算器（５）にて加算しモノラル化し
符号器（６）により符号化した信号とを、多重化回路（
７）にて多重化して受信側に送信するようにしたことを
特徴とする音声符号化装置。 ２、）特許請求の範囲第１項において、２個のマイクロ
ホンでステレオ収録した両チャンネル信号を夫々ローパ
スフィルタ、ハイパスフィルタにて、低域、高域に分割
し、位相差検出手段にて両チャンネルの位相差を検出す
るのは低域側とし、レベル差検出手段にてレベル差を検
出するのは高域側としたことを特徴とする音声符号化装
置。[Claims] 1.) A level difference detected by a level difference detection means (3) of both channel signals recorded in stereo by two microphones (1, 2), and a phase difference detection means (4). The phase difference detected by the adder (5) adds the phase difference detected by the adder (5), converts the signal into monaural, and encodes the signal by the encoder (6).
7) A speech encoding device characterized in that the speech encoding device multiplexes the multiplexed data and transmits the multiplexed data to a receiving side. 2.) In claim 1, both channel signals recorded in stereo with two microphones are divided into low and high frequencies by a low-pass filter and a high-pass filter, respectively, and both channels are detected by phase difference detection means. 1. A speech encoding device characterized in that a phase difference is detected on a low frequency side, and a level difference is detected on a high frequency side by a level difference detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24884386A JPS63102516A (en) | 1986-10-20 | 1986-10-20 | Vocoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24884386A JPS63102516A (en) | 1986-10-20 | 1986-10-20 | Vocoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63102516A true JPS63102516A (en) | 1988-05-07 |
Family
ID=17184242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24884386A Pending JPS63102516A (en) | 1986-10-20 | 1986-10-20 | Vocoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63102516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02202300A (en) * | 1989-01-31 | 1990-08-10 | Toshiba Corp | Stereo sound transmission system |
-
1986
- 1986-10-20 JP JP24884386A patent/JPS63102516A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02202300A (en) * | 1989-01-31 | 1990-08-10 | Toshiba Corp | Stereo sound transmission system |
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