JPS63181000A - Time base converter for voice signal - Google Patents
Time base converter for voice signalInfo
- Publication number
- JPS63181000A JPS63181000A JP62012715A JP1271587A JPS63181000A JP S63181000 A JPS63181000 A JP S63181000A JP 62012715 A JP62012715 A JP 62012715A JP 1271587 A JP1271587 A JP 1271587A JP S63181000 A JPS63181000 A JP S63181000A
- Authority
- JP
- Japan
- Prior art keywords
- audio signal
- zero
- signal
- time axis
- input audio
- 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
- 230000005236 sound signal Effects 0.000 claims description 39
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、例えば磁気テープ等の記録媒体に記録された
音声信号を記録時とは異なる速い速度で再生して、通常
よシも短時間で再生音声を閏〈ことができるテープレコ
ーダ等の磁気記録再生装置に用いられる音声信号の時間
軸変換装置に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention reproduces an audio signal recorded on a recording medium such as a magnetic tape at a faster speed than the recording speed, and reproduces the audio signal in a shorter time than usual. The present invention relates to an audio signal time axis converting device used in a magnetic recording/reproducing device such as a tape recorder, which is capable of interleaving reproduced audio.
〈発明の概要〉
本発明は、入力音声信号をサンプリングし、書込み及び
読出しを順次行ない、書込み及び読出しのクロック周波
数の比で時間軸変換を行なう音声信号の時間軸変換装置
であって、特に入力音声信号のサンプリング期間と棄却
期間とを入力音声信号のゼロクロス点に基づいて周期単
位で設定したものである。<Summary of the Invention> The present invention is an audio signal time axis conversion device that samples an input audio signal, sequentially writes and reads the input audio signal, and performs time axis conversion based on the ratio of writing and reading clock frequencies. The sampling period and rejection period of the audio signal are set in units of cycles based on the zero-crossing point of the input audio signal.
〈従来の技術〉
従来から例えばテープレコーダー等の磁気記録再生装置
において、磁気テープに記録された内容を短時間で聞け
るようにするために、磁気テープを記録時とは異なる速
い速度で送り移動させることにより高速再生することが
行なわれている。<Conventional technology> Conventionally, in magnetic recording and reproducing devices such as tape recorders, in order to listen to the contents recorded on the magnetic tape in a short time, the magnetic tape is fed and moved at a speed different from that during recording. This allows for high-speed playback.
しかし、その場合には、高速再生された音声信号の周波
数が、原信号（記録時における音声信号）の周波数より
も高くなるため、そのままでは非常に聞き取りにぐい。However, in that case, the frequency of the audio signal reproduced at high speed is higher than the frequency of the original signal (the audio signal at the time of recording), so it is very difficult to hear as it is.
そこで、高速再生された音声信号の周波数を原信号の周
波数に戻して聞き埃り遍い再生音声を得るために、第３
図に示すように、高速再生された音声信号Ｓ１を適当に
サンプリングし、夫々のサンプリング音声信号を原信号
の周波数に戻した上で信号Ｓ２のようにつなぎ合わせる
といういわゆる時間軸の変換操作が行なわれて−る。Therefore, in order to return the frequency of the high-speed reproduced audio signal to the frequency of the original signal and obtain a reproduced sound that is evenly dusty, a third
As shown in the figure, a so-called time axis conversion operation is performed in which the high-speed reproduced audio signal S1 is appropriately sampled, each sampled audio signal is returned to the frequency of the original signal, and then spliced as signal S2. It is.
〈発明が解決しようとする問題点〉
ところが、このような従来の時間軸変換操作においては
、サンプリング処理期間（サンプリング時間′＠）が、
その信号波形には無関係に一定であり、第３図からも明
らかなように、各信号同士のつなぎ目が不連続となって
、耳ざわりなノイズが生じてしまう。<Problems to be solved by the invention> However, in such conventional time axis conversion operations, the sampling processing period (sampling time ′@) is
It is constant regardless of the signal waveform, and as is clear from FIG. 3, the joints between the signals become discontinuous, resulting in unpleasant noise.
また、この欠点を改善するために、前記各信号同士の不
連続なつなぎ目付近をミュートして、その前後のゼロク
ロス点で各信号同士を連続につなぎ合わせる、という手
段が最近になって考えられているが、かかる改善手段を
講じても、各信号同士のつなぎ目付近に無信号部分が周
期的に現れるため、やはり各信号のつなぎ目でノイズが
生じてしまい音質が劣化してい念。In addition, in order to improve this drawback, a method has recently been considered in which the areas near the discontinuous joints between the signals are muted, and the signals are continuously joined at the zero cross points before and after the mute. However, even if such improvement measures are taken, no-signal parts will periodically appear near the joints between each signal, so noise will still occur at the joints of each signal and the sound quality will deteriorate.
く問題点を解決するための手段〉
上記の問題点を解決するために本発明の音声信号の時間
軸変換装置は、入力音声信号のゼロクロス点を検出する
ゼロクロス検出回路と、検出されたゼロクロス点をカウ
ントする計数回路と、ゼロクロス点のカウント数に応じ
て、駆動するクロックゲート回路とを備え、入力音声信
号のサンプリング期間と棄却期間とをそのゼロクロス点
に基づいて周期単位で設定するようにしたものである。Means for Solving the Problems> In order to solve the above problems, the audio signal time axis conversion device of the present invention includes a zero-cross detection circuit that detects zero-crossing points of an input audio signal, and a zero-crossing detection circuit that detects zero-crossing points of an input audio signal. and a clock gate circuit that drives according to the count number of zero-crossing points, and the sampling period and rejection period of the input audio signal are set in units of cycles based on the zero-crossing points. It is something.
く作１ｎ〉
従って、入力音声信号に応じてサンプリング期間と棄却
期間が変化するため、入力音声信号を１周期の途中で切
断するようなことがなく、出力信号波形の連続性が良ぐ
なり、高音質の高速再生音声を得ることができる。Therefore, since the sampling period and the rejection period change according to the input audio signal, the input audio signal is not cut off in the middle of one cycle, and the continuity of the output signal waveform is improved. High-quality, high-speed playback audio can be obtained.
〈実施例〉 以下、本発明の実施例を図面に従って説明する。<Example> Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の音声信号の時間軸変換装置の要部を示
す概略プロンク図であり、１．５倍速成いは２倍速で再
生された音声信号はＡ−Ｄ＝換回路１に入力される。こ
こでのサンプリングクロックば１，５倍速再生時には３
ｆｓｃ、 ２ｍＭ再生時には２ ｆｓｃ の周波数に
選択されるｏ ｆ３（は例えば１５ＫＨｚに設定する。FIG. 1 is a schematic diagram showing the main parts of the audio signal time axis converting device of the present invention, and the audio signal reproduced at 1.5 times speed or 2 times speed is input to the A-D converter circuit 1. be done. The sampling clock here is 3 when playing at 1.5x speed.
fsc, f3 (of which is selected at the frequency of 2 fsc during 2mM reproduction is set to, for example, 15 KHz).
Ａ−Ｄ変換回路１でデジタルデータに変換された信号は
メモリー回路２及びゼロクロス検出回路３に供給される
。ゼロクロス検出回路３では入力されたデジタル信号の
ゼロクロス点を検出し、これを次段の計数回路４がカウ
ントして、そのカウント数に応じてクロックゲート回路
５が駆動する。The signal converted into digital data by the A-D conversion circuit 1 is supplied to a memory circuit 2 and a zero-cross detection circuit 3. The zero-crossing detection circuit 3 detects the zero-crossing point of the input digital signal, which is counted by the next-stage counting circuit 4, and the clock gate circuit 5 is driven according to the counted number.
〜方、前記メモリー回路２には前記クロックゲート回路
５を通過したクロック信号（３ｆ８．或いは２ｆ、。
）が供給され、入力された前記デジタル信号の必要な部
分をサンプリングメモリーする。On the other hand, the memory circuit 2 receives the clock signal (3f8. or 2f) that has passed through the clock gate circuit 5.
) is supplied, and a necessary portion of the input digital signal is sampled and stored in memory.
メモリーされたデジタル信号は後段のＤ−Ａ変換回路６
で１．５倍速再生時には２ｆ３ｃ、２倍速再生時にはｆ
ｓｃ のクロック周波数で１須次読み出され、アナロ
グ信号に変換された後、ローベスフィルタ７を介して音
程補償された音声信号として出力される。The memorized digital signal is sent to the subsequent D-A converter circuit 6.
2f3c when playing at 1.5x speed, f when playing at 2x speed.
The signal is read out one step at a clock frequency of sc, converted into an analog signal, and then output as a pitch-compensated audio signal via a Loebes filter 7.
第２図（ａ）、 （ｂ）に２倍速で音声信号を再生した
場合の入力音声信号波形ｓ３と時間軸伸長後の出方音声
信号波形Ｓ４との関係を示す。FIGS. 2(a) and 2(b) show the relationship between the input audio signal waveform s3 and the output audio signal waveform S4 after time axis expansion when the audio signal is reproduced at double speed.
ゼロクロス検出回路３で信号ｓ３のＡ点、Ｂ点、０点、
Ｄ点、Ｅ点を検出し、Ａ点から０点の間の信号はクロッ
クゲート回路５をオープンしてメモリー回路２にメモリ
ーシ、０点からＥ点の間の信号はクロックゲート回路５
をクローズして棄却する。ＣＡ点からＥ点の２周期をメ
モリーしてその後の２周期を棄却するようにしてもよい
。）この制御は計数回路４によって再生スピードに応じ
て行なわれる。例えば１．５倍速再生時には原信号の２
周期をメモリーシて、後の１周期を棄却するようにする
。このようにして、サンプリング−メモリーと棄却をく
り返し、メモリー回路２にデジタル信号を書込むと共に
、出力信号が通常再生時と同じ周波数となる上記のクロ
ック周波数で読出して再生音声信号の時間軸伸長を行な
うものである。The zero cross detection circuit 3 detects the A point, B point, 0 point of the signal s3,
Points D and E are detected, and signals between points A and 0 are stored in the memory circuit 2 by opening the clock gate circuit 5, and signals between points 0 and E are stored in the clock gate circuit 5.
Close and reject. It is also possible to memorize two periods from point CA to point E and discard the subsequent two periods. ) This control is performed by the counting circuit 4 according to the reproduction speed. For example, when playing at 1.5x speed, the original signal is
The period is memorized and the next one period is discarded. In this way, sampling-memory and rejection are repeated, and the digital signal is written into the memory circuit 2, and the output signal is read out at the above clock frequency, which is the same frequency as during normal playback, to expand the time axis of the reproduced audio signal. It is something to do.
このように入力音声信号Ｓ３のゼロクロス点Ａ乃至Ｅに
基づいて信号Ｓ３のサンプリング期間及び棄却期間を周
期単位で設定すれば、第２図（ｂ）に示すように、サン
プリングされた信号はゼロクロス点で接続され、また波
形の連続性も殆んど損われず、良好な高速再生音声を得
ることができる。If the sampling period and rejection period of the signal S3 are set in units of cycles based on the zero-crossing points A to E of the input audio signal S3, the sampled signal will reach the zero-crossing point as shown in FIG. 2(b). Furthermore, the continuity of the waveform is hardly impaired, and good high-speed playback audio can be obtained.
〈発明の効果〉
以上のように本発明の音声信号の時間軸変換装置は、入
力音声信号のサンプリング期間と棄却期間とをそのゼロ
クロス点に基づいて周期単位で設定しているため、出力
は号波形の連続性が良く、ノイズのない高音質の高速再
生音声を得ることができる。<Effects of the Invention> As described above, the audio signal time axis conversion device of the present invention sets the sampling period and rejection period of the input audio signal in units of cycles based on the zero-crossing point, so the output is It is possible to obtain high-quality, high-speed playback audio with good waveform continuity and no noise.
第１図は本発明の音声信号の時間軸変換装置の要部を示
す概略ブロック図、第２図（ａ）、 （ｂ）は共に本発
明の音声信号の時間軸変換装置の入力音声信号波形と出
力音声信号波形との関係を示す波形図、第３図は従来の
音声信号の時間軸変換装置の入力音声信号波形と出力音
声信号波形との関係を示す波形図である。
３・・・ゼロクロス検出回路、 ４・・・計数回路
、５・・・クロックゲート回路。FIG. 1 is a schematic block diagram showing the main parts of the audio signal time axis conversion device of the present invention, and FIGS. 2(a) and (b) are both input audio signal waveforms of the audio signal time axis conversion device of the present invention. FIG. 3 is a waveform diagram showing the relationship between the input audio signal waveform and the output audio signal waveform of a conventional audio signal time axis conversion device. 3... Zero cross detection circuit, 4... Counting circuit, 5... Clock gate circuit.
Claims (1)
を順次行ない、書込み及び読出しのクロック周波数の比
で時間軸変換を行なう装置であって、入力音声信号のゼ
ロクロス点を検出するゼロクロス検出回路と、検出され
たゼロクロス点をカウントする計数回路と、ゼロクロス
点のカウント数に応じて駆動するクロックゲート回路と
を備え、入力音声信号のサンプリング期間と棄却期間と
をそのゼロクロス点に基づいて周期単位で設定すること
を特徴とする音声信号の時間軸変換装置。1. A device that samples an input audio signal, sequentially performs writing and reading, and performs time axis conversion based on the ratio of writing and reading clock frequencies, and includes a zero-crossing detection circuit that detects zero-crossing points of the input audio signal, and a detection circuit. and a clock gate circuit that is driven according to the counted number of zero-crossing points, and sets the sampling period and rejection period of the input audio signal in units of cycles based on the zero-crossing points. A time axis conversion device for an audio signal, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012715A JP2698579B2 (en) | 1987-01-21 | 1987-01-21 | Audio signal time base converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012715A JP2698579B2 (en) | 1987-01-21 | 1987-01-21 | Audio signal time base converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63181000A true JPS63181000A (en) | 1988-07-26 |
| JP2698579B2 JP2698579B2 (en) | 1998-01-19 |
Family
ID=11813125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62012715A Expired - Fee Related JP2698579B2 (en) | 1987-01-21 | 1987-01-21 | Audio signal time base converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2698579B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06223497A (en) * | 1991-07-09 | 1994-08-12 | Mitsuru Umemoto | Sound information recording device and magnetic recording medium recorded with sound information |
| US11026361B2 (en) | 2013-03-15 | 2021-06-01 | John S. Youngquist | Linear/angular correction of pick-and-place held component and related optical subsystem |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56126898A (en) * | 1980-03-12 | 1981-10-05 | Sony Corp | Voice pitch converter |
| JPS5774809A (en) * | 1980-10-24 | 1982-05-11 | Sony Corp | Voice signal processing device |
| JPS57135408A (en) * | 1981-02-16 | 1982-08-21 | Matsushita Electric Ind Co Ltd | Time base converter of sound signal |
| JPS5886600A (en) * | 1981-11-18 | 1983-05-24 | リコーエレメックス株式会社 | Time base converter |
| JPS60216393A (en) * | 1984-04-12 | 1985-10-29 | ソニー株式会社 | Information processor |
-
1987
- 1987-01-21 JP JP62012715A patent/JP2698579B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56126898A (en) * | 1980-03-12 | 1981-10-05 | Sony Corp | Voice pitch converter |
| JPS5774809A (en) * | 1980-10-24 | 1982-05-11 | Sony Corp | Voice signal processing device |
| JPS57135408A (en) * | 1981-02-16 | 1982-08-21 | Matsushita Electric Ind Co Ltd | Time base converter of sound signal |
| JPS5886600A (en) * | 1981-11-18 | 1983-05-24 | リコーエレメックス株式会社 | Time base converter |
| JPS60216393A (en) * | 1984-04-12 | 1985-10-29 | ソニー株式会社 | Information processor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06223497A (en) * | 1991-07-09 | 1994-08-12 | Mitsuru Umemoto | Sound information recording device and magnetic recording medium recorded with sound information |
| US11026361B2 (en) | 2013-03-15 | 2021-06-01 | John S. Youngquist | Linear/angular correction of pick-and-place held component and related optical subsystem |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2698579B2 (en) | 1998-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |