JPS5940731A - Noise eliminating device - Google Patents

Noise eliminating device

Info

Publication number
JPS5940731A
JPS5940731A JP57150836A JP15083682A JPS5940731A JP S5940731 A JPS5940731 A JP S5940731A JP 57150836 A JP57150836 A JP 57150836A JP 15083682 A JP15083682 A JP 15083682A JP S5940731 A JPS5940731 A JP S5940731A
Authority
JP
Japan
Prior art keywords
output
delta
signal
pattern
section
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
Application number
JP57150836A
Other languages
Japanese (ja)
Inventor
Kazuhiro Kimura
一洋 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP57150836A priority Critical patent/JPS5940731A/en
Publication of JPS5940731A publication Critical patent/JPS5940731A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
    • H04B14/062—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using delta modulation or one-bit differential modulation [1DPCM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate a stepwise demodulated output(granular noise) due to code string ''0101'', by providing a pattern detecting means of delta code string ''0101'' and a means for holding a demodulating section output with the output of the detecting means, in the demodulting section of a delta modulating system of a voice signal. CONSTITUTION:An adder 11 adds delta-coded signal from a terminal 7 and an output signal of a one-step delay element 10, the output is outputted to a terminal 8 as a demodulted voice output and inputted to the one-step delay element. In denating a delta coding signal and a demodulated voice output at terminals 7, 8 as en, sn, respectively, a 01 pattern detecting section 9 outputs 0 when the ''0'', ''1'' of the delta-coded signal string ''01010101'' of the en are consecutive alternately for 8 times >= as a detecting output, and outputs 1 in other cases. Thus, when the 01 pattern detecting section 9 detects the 01 pattern, the demodulated voice signal is held, and no granular noise is generated.

Description

【発明の詳細な説明】 不発８Ａは、音声信号の情報伝送に対して最低限の１ビ
ツトを使用するデルタ変調方式の復調部におけるグラニ
ュラ−雑音（ｇｒａｎｕｌａｒ　ｒｏｉｓｅ）を除去す
る小を可能とする雑音除去装置に関するものである。[Detailed description of the invention] Misfire 8A is a noise that makes it possible to eliminate granular noise in the demodulation section of the delta modulation method that uses a minimum of 1 bit for information transmission of audio signals. This invention relates to a removal device.

一般にデルタ変調では、１ビット符号化であるため、“
変化せず″という状態には符号の割シ尚てを行っていな
いので、十△か−Δかのどちらかの状態を必ずとる。そ
のため、音声信号値がΔの振幅値に比べて小さな変化の
とき第１図に示すように、デルタ符号列は１と０を繰シ
返すことによシ、原音声信号値がほとんど変化しないに
もかかわらず、符号化されたものは階段状の変化を繰シ
返し、とのような変化は、ｏｔ鯛音声の質にひずみ（グ
ラニュラ−雑音）となシ、全スペクトルにわたって影響
を与えるため、音質に影響を与えるという欠点がありた
。同、図中、１はデルタ符号値（グラニーラー雑音）、
２は音声信号値、３は信号振幅軸、４は時間軸、５はス
テップ幅、６はデルタ符号を示す。In general, delta modulation uses 1-bit encoding, so “
Since no sign is divided into the state of "no change", the state is always either 10 △ or - Δ. Therefore, if the audio signal value has a small change compared to the amplitude value of Δ As shown in Figure 1, the delta code string is created by repeating 1s and 0s, so that even though the original audio signal value hardly changes, the encoded code shows a step-like change. Repeated changes cause distortion (granular noise) to the quality of the sea bream voice and affect the entire spectrum, which has the disadvantage of affecting the sound quality. , 1 is the delta code value (granneyler noise),
2 indicates the audio signal value, 3 indicates the signal amplitude axis, 4 indicates the time axis, 5 indicates the step width, and 6 indicates the delta code.

本発明は、原音声信号値がほとんど変化しない時に発生
するデルタ符号列“０１０１・・・″のパターンを復調
部にて検出し、その検出出力によ多、復調動作を停止（
後脚出力は復調停止前の値で保持。）させることによシ
上記欠点を除去し、高音質の音声復調を可能とする雑音
除去方式を提供するものである。The present invention detects a pattern of delta code string "0101..." that occurs when the original audio signal value hardly changes, and detects the pattern of the delta code string "0101..." which occurs when the original audio signal value hardly changes, and when the detected output is detected, the demodulation operation is stopped (
The rear leg output is maintained at the value before demodulation stopped. ), thereby eliminating the above-mentioned drawbacks and providing a noise removal method that enables high-quality voice demodulation.

すなわち、本発明は上声信号におけるデルタ変調方式の
復調部において、デルタ符号列の“０１０１・・・”の
パターン検出手段と、前記検出手段の出力で（Ｍ調部出
力を保持させる手段とを貝、備してデルタ符号列“０１
０１・・パ′による階段状の＆）１１４出力（グラニュ
ラ−４Ｌ音）を除去せしめるものである。That is, the present invention provides a demodulation section of a delta modulation system for an upper voice signal, which includes a means for detecting a pattern of "0101..." of a delta code string, and a means for holding the output of the M modulation section using the output of the detection means. The shell has a delta code string “01”.
This is to remove the stepped &)114 output (granular-4L sound) caused by 01...PA'.

次に本発明の実施例について図面を参照して説明する。Next, embodiments of the present invention will be described with reference to the drawings.

　　　　　　一 本発明による雑音除去装置のブロック図を示す第２図を
ｔ９照すると、加算器１１は端子７からのデルタ打上化
信号と１ステップ遅れ要素１ｏの出力信号を加算し、そ
の加算出力は復調音声出力として端子８へ出力すると同
時に１ステップ遅れ要素へ入力される。０１パタ一ン検
出部９は端子７に接続され、その検出出力は加算器１１
へ接続されている。Referring to FIG. 2 showing a block diagram of the noise removal device according to the present invention at t9, the adder 11 adds the delta launch signal from the terminal 7 and the output signal of the one-step delay element 1o, and the added output is demodulated. It is output to the terminal 8 as an audio output and at the same time is input to the one-step delay element. 01 pattern detection section 9 is connected to terminal 7, and its detection output is sent to adder 11.
connected to.

端子７，８のデルタ符号化信号と復調音声出力値をそれ
ぞれｅｎ（！：Ｓｎ　どすると、礼＝Ｃ・Δｅｎ＋ｓｎ
−。If the delta encoded signal and demodulated audio output value of terminals 7 and 8 are respectively en(!:Sn), then C=C・Δen+sn
−.

△ニステップ幅 １！ｎ”＋１が１のときｌ　、　ｅｎがＯのとき　１ ｎ：サンプル回数を表わす添字 Ｃ：０１パターン検出出力１のとき０ 〃　　　　　０のとき１ となる。０１パタ一ン検出部９ではｅｎのデルタ符号化
信号列が“０１０１０１０１’″の′Ｏ″１．１１７１
１が交互に８回以上つづいている場合に、０１パターン
検出力として０、それ以外は１を出力する。それ故Ｏｌ
パターン検出部９が０１パターンを検出した場合、復調
音声信号は保持されており、グラニーラー雑音は発生し
ない。△Ni-step width 1! When n''+1 is 1, it is 1; when en is O, it is 1. n: Subscript representing the number of samples C: 0 when the 01 pattern detection output is 1; 'O''1.1171 where the delta encoded signal sequence is “01010101'”
If 1 is repeated 8 times or more alternately, 0 is output as the 01 pattern detection power, otherwise 1 is output. Therefore Ol
When the pattern detection section 9 detects the 01 pattern, the demodulated audio signal is retained and grannyar noise does not occur.

本発明は以上説明したように、デルタ符号列の“０１０
１・・・”のパターン検出を行い、そのパターン検出時
に１デルタ符号からの音声復調出力値を保持させること
によシ、グラニュラ−＃ミ音を除去し、高品質な音声復
調を可能にする効果がある。As explained above, the present invention provides “010
By detecting a pattern of "1..." and retaining the audio demodulation output value from the 1 delta code at the time of pattern detection, the granular #M sound is removed and high quality audio demodulation is possible. effective.

【図面の簡単な説明】[Brief explanation of drawings]

ｔＸ１図は、グラニ雑音−雑音図、第２図は、本発明の
ブロック図を示す。 １・・・・・・デルタ符号値（グラニュラ−雑音）、２
・・・・・・音声信号値、３・・・・・・信号振幅軸、
４・・・・・・時間軸、５・・・・・・ステップ幅、６
・・・・・・デルタ符号、７・・・・・・デルタ符号入
力端子、８・・・・・・復調音声出力端子、９・・・・
・・Ｏｌパターン検出部、１０・・・・・・ｌステップ
遅れ要素、１１・・・・・・加算器、１２・・・・・・
制御線。 熊１　図The tX1 diagram shows a Granny noise-noise diagram, and FIG. 2 shows a block diagram of the present invention. 1...Delta code value (granular noise), 2
...Audio signal value, 3...Signal amplitude axis,
4...Time axis, 5...Step width, 6
...Delta code, 7...Delta code input terminal, 8...Demodulated audio output terminal, 9...
...Ol pattern detection unit, 10...l step delay element, 11...adder, 12...
control line. Bear 1 diagram

Claims (1)

【特許請求の範囲】[Claims] デルタ変調方式を受けた音声信号を受け、前記デルタ変
調の復調部においてデルタ符号列パターンを検出するパ
ターン検出手段と、この検出手段の出力で前記音声信号
の復調出力を保持させる手段とを具備してなることを特
徴とする雑音除去装置。The apparatus includes pattern detection means for receiving an audio signal subjected to delta modulation and detecting a delta code string pattern in the delta modulation demodulation section, and means for holding the demodulated output of the audio signal with the output of the detection means. A noise removal device characterized by:
JP57150836A 1982-08-31 1982-08-31 Noise eliminating device Pending JPS5940731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57150836A JPS5940731A (en) 1982-08-31 1982-08-31 Noise eliminating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57150836A JPS5940731A (en) 1982-08-31 1982-08-31 Noise eliminating device

Publications (1)

Publication Number Publication Date
JPS5940731A true JPS5940731A (en) 1984-03-06

Family

ID=15505436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57150836A Pending JPS5940731A (en) 1982-08-31 1982-08-31 Noise eliminating device

Country Status (1)

Country Link
JP (1) JPS5940731A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186329U (en) * 1984-11-14 1986-06-06
JPS6211998A (en) * 1985-07-09 1987-01-20 タツタ電線株式会社 Voice alarm
JPS63263922A (en) * 1987-04-22 1988-10-31 Texas Instr Japan Ltd Signal modulator/demodulator
JPH0313086A (en) * 1989-06-09 1991-01-22 Canon Inc Decoder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186329U (en) * 1984-11-14 1986-06-06
JPS6211998A (en) * 1985-07-09 1987-01-20 タツタ電線株式会社 Voice alarm
JPS63263922A (en) * 1987-04-22 1988-10-31 Texas Instr Japan Ltd Signal modulator/demodulator
JPH0313086A (en) * 1989-06-09 1991-01-22 Canon Inc Decoder

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