KR20120128923A - Cross-pading appratus using time stretching - Google Patents

Cross-pading appratus using time stretching Download PDF

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Publication number
KR20120128923A
KR20120128923A KR1020110046868A KR20110046868A KR20120128923A KR 20120128923 A KR20120128923 A KR 20120128923A KR 1020110046868 A KR1020110046868 A KR 1020110046868A KR 20110046868 A KR20110046868 A KR 20110046868A KR 20120128923 A KR20120128923 A KR 20120128923A
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KR
South Korea
Prior art keywords
sound source
source data
time
unit
mixer
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KR1020110046868A
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Korean (ko)
Inventor
김희찬
코이치로 미야자키
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(주)파인아크코리아
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Priority to KR1020110046868A priority Critical patent/KR20120128923A/en
Publication of KR20120128923A publication Critical patent/KR20120128923A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/038—Cross-faders therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The present invention relates to a cross fading apparatus capable of cross fading with only one sound source input unit by sampling and extending the input sound source data. More particularly, the sampling data output is extended through a time stretcher unit for expanding the sampled sound source data at a constant ratio. The present invention relates to a cross fading apparatus using time stretching in which cross fading made through two or more sound source input units can be easily made with one input unit by cross fading.
To this end, the present invention includes an input unit for continuously receiving a plurality of digital sound source data from the outside; A time stretcher unit receiving the sound source data from the input unit and extending the number of sampling data of the sound source data per second at a specific ratio; A PC buffer which receives sampling data of sound source data from the time stretcher and temporarily stores the sampling data of the sound source data; A mixer configured to receive sampling data of sound source data from the fish buffer; A D / A converter for D / A converting the sound source data received from the mixer; An output unit which receives analog sound source data from the D / A converter and outputs it; An end detector installed between the input unit and the time stretcher and detecting an end signal of the sound source data transmitted to the time stretcher; A switching unit installed at a rear end of the end detector between the input unit and the time stretcher and bypassing sound source data input to the mixer for a specific time when the end signal is detected from the end detector; By controlling the input unit, time stretcher, PC buffer, end detector, and switching unit, the sound source data and the sound source data consecutively inputted at the end of any sound source data continuously inputted are crossed for a specific time through the mixer. And fading the controller to transmit the sound source data bypassed by the switching unit to the time stretcher when the corresponding sound source data ends after a specific time has elapsed.

Description

CROSS-PADING APPRATUS USING TIME STRETCHING}

The present invention relates to a cross fading apparatus capable of cross fading with only one sound source input unit by sampling and extending the input sound source data. More particularly, the sampling data output is extended through a time stretcher unit for expanding the sampled sound source data at a constant ratio. The present invention relates to a cross fading apparatus using time stretching in which cross fading made through two or more sound source input units can be easily made with one input unit by cross fading.

In general, when a plurality of songs are continuously output when outputting sound source data, a cross fading technique is used to overlap the last part of a previous song and the first part of a new song so that there is no silence between songs.

The cross fading technique includes an input unit having a plurality of channels, and the sound source data continuously inputs are changed according to a song, and the channel fades out at a specific point before the end of the channel being output, and is simultaneously input to another channel. The sound source data to be faded in is superimposed so that the end of the song currently being output and the beginning of the song to be immediately outputted are superimposed.

However, as the cross fading device includes a plurality of input channels, a configuration circuit becomes complicated and a manufacturing time, a manufacturing cost, and the like increase in disadvantages.

The present invention has been made in order to solve the above problems is made through the existing two or more sound source input unit by configuring the cross fading by the sampling data output time is extended through the time stretcher for extending the sampled sound source data to a certain ratio It is an object of the present invention to provide a cross fading apparatus using time stretching in which cross fading can be easily made by using only one input unit.

The present invention has the following features to achieve the above object.

The present invention includes an input unit for continuously receiving a plurality of digital sound source data from the outside; A time stretcher unit receiving the sound source data from the input unit and extending the number of sampling data of the sound source data per second at a specific ratio; A PC buffer which receives sampling data of sound source data from the time stretcher and temporarily stores the sampling data of the sound source data; A mixer configured to receive sampling data of sound source data from the fish buffer; A D / A converter for D / A converting the sound source data received from the mixer; An output unit which receives analog sound source data from the D / A converter and outputs it; An end detector for detecting an end signal of the sound source data transmitted to the time stretcher through the input unit; A switching unit installed between the input unit and the time stretcher and bypassing the sound source data input to the mixer for a specific time when an end signal is detected from the end detector; By controlling the input unit, time stretcher, PC buffer, end detector, and switching unit, the sound source data and the sound source data consecutively inputted at the end of any sound source data continuously inputted are crossed for a specific time through the mixer. And fading the controller to transmit the sound source data bypassed by the switching unit to the time stretcher when the corresponding sound source data ends after a specific time has elapsed.

Here, the end detector detects the end bit of the sound source data or, if there is no end bit, detects the silent portion of the sound source data and transmits it to the controller to determine the end point. The end detector analyzes the code pattern of the sound source data. When the silent detection is detected, whether the code pattern for a predetermined time immediately before the silent detection corresponds to the set song ending code pattern is transmitted to the controller unit.

In addition, on the bypass path between the PC buffer and the mixer, and the switching unit and the mixer, a first volume control unit and a second volume control unit are further included to control the volume at the time of cross fading by the controller. The volume control unit gradually decreases the volume and the second volume control unit cross-fades out and cross-fades in so that the volume gradually increases, and when the sound source data inputted to the input unit is not digital, It is converted into input sound source data of the form.

According to the present invention, by extending the number of sound source data to be sampled at a constant rate and continuously bypassing the sound source data input at the rear stage to the mixer through the switching unit, one input unit is made as cross fading is performed for the extended sampling number of time. The configuration alone allows cross fading.

In addition, when the end detector detects the end point, when there is no end bit, the multi-detection is performed through the code pattern analysis as well as the silent detection, thereby inducing stable operation of the cross fading system.

1 is a block diagram showing an internal configuration of a cross fading apparatus according to the present invention.

Hereinafter, a cross fading apparatus according to the present invention will be described in detail with the accompanying drawings.

1 is a block diagram showing an internal configuration of a cross fading apparatus according to the present invention.

Referring to the drawings, the cross fading apparatus 100 according to the present invention is an input unit 10 for continuously receiving a plurality of digital sound source data from the outside, and receives the sound source data from the input unit 10 sound source data per second The time stretcher 20 extends the number of sampling data in a specific ratio, the fish buffer buffer 30 receives the sampling data of the sound source data from the time stretcher 20, and temporarily stores the sample data. A mixer 40 receiving the sampling data of the sound source data from the 30, a D / A converter 50 for D / A converting the sound source data received from the mixer 40, and an analog from the D / A converter. An output unit 60 for receiving the form of sound source data and outputting the sound source data, an end detector 70 for detecting an end signal of the sound source data transmitted from the input unit 10 to the time stretcher unit 20, and the input unit; A switching unit 80 installed between the unit 10 and the time stretcher unit 20 to bypass the sound source data input to the mixer 40 for a specific time when an end signal is detected from the end detector 70; Sound source data at the end of any one of the sound source data continuously input by controlling the input unit 10, the time stretcher 20, the fish buffer (30), the end detector 70, the switching unit 80 And the sound source data continuously inputted thereto are cross-faded for a specific time through the mixer 40, and when the corresponding sound source data ends after a specific time elapses, the sound source data bypassed by the switching unit 80 is a time stretcher unit. The controller 90 is configured to transmit the sound source data to the controller 20.

The input unit 10 is provided to receive sound source data from the outside, and the input sound source data is classified into digital sound source data and analog sound source data.

Accordingly, the input unit 10 detects the shape of the input sound source data and converts it into a digital sound source through the A / D converter 11 and transmits it to the time stretcher 20 when it is determined to be an analog form.

The detection of the sound source form and the data conversion of the A / D converter 11 are performed under the control of the controller 90 to be described later.

On the other hand, the time stretcher 20 extends the number of samples per second of digital sound source data received from the input unit 10. When the sampling number is extended, the time stretcher 20 adds a sampling number at a constant rate without changing the tone of the sound source.

For example, the number of sampling of existing digital sound source data is 44100 pieces per second. The time stretcher 20 according to the present invention extends the sampling number to 45100 pieces by 2.27%.

This sampling number expansion should be made to the extent that the user can not recognize the expansion when listening to the sound source data, and the sampling rate expansion ratio is set to about 2 to 3% of the total number of sampling or 2 compared to the total sound data output time After calculating the number of sampling extensions for which a time extension of about 3 seconds may be performed, the extension may be set to be extended by a corresponding extension number.

This sampling number expansion ratio is to secure the cross fading time according to the present invention and secures the cross fading time by the expansion ratio of 2.27% as described above.

In general, the song data output time in the form of a song is about 3 to 4 minutes, and when 3 minutes, it is possible to secure a cross fading time by 180 * 0.027 seconds, that is, 4.8 seconds.

The sampling number expansion ratio is preferably made to be freely set by the time stretcher 20 by the user.

Meanwhile, the sound source data extended by the number of times of the time stretcher 20 is transferred to the PCM buffer 30. The PC buffer 30 temporarily stores the transmitted sound source data and at the same time, the mixer 40. It is delivered sequentially).

In addition, the mixer 40 is bypassed from the switching unit 80 to be described later at the same time receiving the sound source data transmitted from the fish buffer (30) to the mixer 40 directly without passing through the time stretcher (20) Receives the sound source data to be delivered together to mix the sound source data of both and delivers to the D / A converter (50).

The mixing time of the mixer 40 is mixed as much as the extension time of the currently output sound source data according to the above-described sampling number expansion ratio.

In addition, the sound source data transmitted to the D / A converter 50 is output as the sound source data of the analog form through the output unit 60.

On the other hand, the end detector 70 is provided to detect the end point of the sound source data input for cross fading, the end detector 70 according to the present invention for detecting the end point is the end bit detection unit 71, It may include any one or more of the silent detection unit 72, the code pattern detection unit 73.

In the case of a digital sound source such as MP3, an end bit is inherent at the end of sound source data and configured to detect it by the end bit detection unit 71. In the case of sound source data without such an end bit, the silent portion generated at the end of a song is silent Configured to sense at branch 72.

Depending on the characteristics of the sound source data, there may be a silent portion in the middle of the song, so the reliability of detecting the end point of the sound source data may be deteriorated. Do.

The code pattern detecting unit 73 analyzes the code of the sound source data continuously input and then temporarily stores the code pattern for a predetermined time immediately before the silent detection when the silent unit detects the silent unit. To send.

Accordingly, the controller 90 stores the end code pattern, which generally consists of a plurality of code patterns, in advance, and determines whether or not it matches the code pattern received from the code pattern detecting unit 73. The final judgment will be.

The end point detection through the end detector 70 is necessary for performing the bypass operation of the sound source data input afterwards for the cross fading to the mixer 40 through the switching unit 80, and the end detector 70 is detected. The controller 90 determines whether the controller 90 is finally terminated by the data, and controls the sound source data that is subsequently transmitted to the switching unit 80 to be directly bypassed and transferred to the mixer 40.

In addition, the PC buffer 30 notifies the controller 90 when all of the temporarily stored sound source data is transferred to the mixer, and causes the controller 90 to stop the bypass driving of the switching unit 80 and thereafter time stress. It is configured to output sound source data to the recording unit 20.

In addition, on the bypass path between the PC buffer 30 and the mixer 40 and between the switching unit 80 and the mixer 40, the first volume control unit adjusts the volume at the time of cross fading by the controller 90. 91 and a second volume control unit 92, respectively, the first volume control unit 91 and the second volume control unit 92, respectively, the first volume control unit 91 at the start of cross fading The volume is gradually reduced (100-> 0), and the second volume adjusting unit 92 cross fading out and cross fading in so that the volume is gradually increased (0-> 100).

Herein, the cross fading start and end time determination is performed as described above, when the end point of the sound source data currently input by the end detector 70 and the sound source data to be temporarily stored from the PC buffer 30 are transferred to the mixer. Each time point detected as missing will correspond.

Referring to the cross fading operation process according to the present invention, first, it is determined whether the form of the input sound source data is digital or analog, and if it is analog, it is converted into a digital form through the A / D converter 11.

Accordingly, the sound source data converted into the digital form or the digital form is transmitted to the time stretcher 20 through the switching unit 80 to expand the number of samples per second of the sound source data to a certain ratio.

At this time, the controller 90 receives the sensed data from the end detector 70 for detecting the end point of the sound source data transmitted from the input unit 10 to the time stretcher unit 20, and when it is determined that the end point is the end point, the sound source data is transmitted. Is bypassed to the mixer 40 through the switching unit 80 to be delivered.

On the other hand, the sound source data transmitted to the time stretcher unit 20 and the number of samplings extended is transmitted to the mixer 40 via the fish buffer (30), and is analog-converted through the D / A converter 50 to output like a speaker. It is output through the unit 60.

When a specific sound source data is input and reaches an end point, an end point is detected by the end detector 70, and the controller 90 then transmits the input sound source data to the mixer through the switching unit 80 and at the same time the first point. The volume of the volume control unit 91 gradually decreases to mute, and the volume of the second volume control unit 92 gradually increases to reach the normal setting volume.

In addition, when the end time is detected by the end detector 70, the controller 90 receives all the sound source data stored in the fish buffer 30 through the fish buffer 30 and outputs them to the mixer. The second volume control unit 92 maintains the volume in a steady state and controls the sound source data that has been bypassed to the mixer 40 through the switching unit 80 to be transmitted to the time stretcher unit 20.

Accordingly, as described above, subsequent songs are sampled and extended through the time stretcher 20 and continuously output through the output unit 60 until the end point is detected by the end detector 70.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to those precise embodiments, and many alternatives, modifications, and variations will be apparent to those skilled in the art. I will understand.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: input unit 11: A / D converter
20: time stretcher 30: fish buffer
40: Mixer 50: D / A Converter
60: output part 70: end detector
71: end bit detection unit 72: silent detection unit
73: code pattern detection unit 80: switching unit
90 controller 91 first volume control unit
92: second volume control unit 100: cross fading device

Claims (5)

An input unit which continuously receives a plurality of digital sound source data from the outside;
A time stretcher unit receiving the sound source data from the input unit and extending the number of sampling data of the sound source data per second at a specific ratio;
A PC buffer which receives sampling data of sound source data from the time stretcher and temporarily stores the sampling data of the sound source data;
A mixer configured to receive sampling data of sound source data from the fish buffer;
A D / A converter for D / A converting the sound source data received from the mixer;
An output unit which receives analog sound source data from the D / A converter and outputs it;
An end detector for detecting an end signal of the sound source data transmitted to the time stretcher through the input unit;
A switching unit installed between the input unit and the time stretcher and bypassing the sound source data input to the mixer for a specific time when an end signal is detected from the end detector;
By controlling the input unit, time stretcher, PC buffer, end detector, and switching unit, the sound source data and the sound source data consecutively inputted at the end of any sound source data continuously inputted are crossed for a specific time through the mixer. And a controller for fading the controller and transmitting the sound source data bypassed by the switching unit to the time stretcher when the corresponding sound source data ends after a specific time has elapsed. Cross fading device used.
The method of claim 1,
The end detector is
Cross-fading apparatus using time stretching to detect the end bit of the sound source data, or if there is no end bit to determine the end point by detecting the silent portion of the sound source data to the controller unit.
The method of claim 2,
The end detector is
When the code pattern of the sound source data is analyzed to detect the silence, cross fading apparatus using time stretching, characterized in that to transmit to the controller unit whether the code pattern corresponds to the set end code pattern for a predetermined time immediately before the silent detection.
The method of claim 1,
On the bypass path between the PC buffer and the mixer and between the switching unit and the mixer, a first volume control unit and a second volume control unit are further included to control the volume at the time of cross fading by the controller, and thus the first at the start of cross fading. The volume control unit gradually decreases the volume, and the second volume control unit cross fading apparatus using time stretching, characterized in that the cross fading out and cross fading in so that the volume is gradually increased.
The method of claim 1,
When the sound source data input to the input unit is not in the digital form, the cross fading apparatus using time stretching, characterized in that the conversion is made to the digital sound source data through the A / D converter.
KR1020110046868A 2011-05-18 2011-05-18 Cross-pading appratus using time stretching KR20120128923A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180046484A (en) * 2016-10-28 2018-05-09 주식회사 수퍼브 Music game system and method for continuous playing to music sound

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180046484A (en) * 2016-10-28 2018-05-09 주식회사 수퍼브 Music game system and method for continuous playing to music sound

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