System and method for controlling audio source

1. A method of signal processing for controlling a sound source, comprising:

deriving a time code signal from a rotating disc, the derived time code signal comprising an absolute time code signal in the audible range;

filtering the derived time code signal to determine a relative time code signal;

determining the speed of rotation of the rotating disc based on the absolute time code signal; and

determining a place on the rotating disc based on the relative time code signal,

wherein the absolute time code signal and the relative time code signal are used to control output from the sound source.

2. The method according to claim 1 , wherein the relative time code signal is determined based on a phase difference between right and left channels of the absolute time code signal.

3. The method according to claim 1 , further comprising determining the direction of the rotation of the rotating disk based on the relative time code signal.

4. The method according to claim 3 , further comprising:

controlling the speed of play of the sound source based on the absolute time code; and

controlling the direction of play of the sound source based on the relative time code signal.

5. The method according to claim 1 , wherein an accurate time code signal is determined based on the absolute time code signal and the relative time code signal, and wherein play of the sound source is controlled based on the accurate time code signal.

6. The method according to claim 1 , wherein controlling output from the sound source includes one or more of:

controlling the play of sound from the sound source;

controlling the play of music from the sound source;

controlling the play of DVD images from the sound source; and

controlling the play of MP3 images from the sound source.

7. The method according to claim 1 , wherein controlling output from the sound source includes producing a scratch sound.

8. The method according to claim 1 , wherein the sound source comprises a CD player, a DVD player, or a MP3 player.

9. A method for controlling an audio source, comprising:

deriving a time code signal from a rotating disc, the derived time code signal comprising an absolute time code signal in the audible range;

filtering the derived time code signal to determine a relative time code signal;

controlling the speed of rotation of an audio source based on the absolute time code signal; and

controlling the direction of rotation of the audio source based on the relative time code signal.

10. The method according to claim 9 , further comprising determining a place on the rotating disc based on the relative time code signal.

11. The method according to claim 10 , further comprising determining the correct place and direction of movement for the audio source, based on the determined place on the rotating disc and the relative time code signal.

12. The method according to claim 9 , further comprising detecting whether the rotating disc is still, based on the absolute time code signal.

13. The method according to claim 9 , wherein the relative time code signal is determined based on a phase difference between right and left channels of the absolute time code signal.

14. The method according to claim 9 , wherein controlling the audio source includes producing a scratch sound.

15. The method according to claim 9 , wherein the audio source comprises a CD player, a DVD player, or a MP3 player.

16. A method for creating a time code disc for controlling an audio source, comprising:

generating an absolute time code signal; and

applying the absolute time code signal to a disc,

wherein the absolute time code signal is in the audible range,

wherein the absolute time code signal includes a right channel and a left channel, and

wherein a relative time code signal can be determined based on a phase difference between the right channel and the left channel.

17. A system for controlling a sound source, comprising:

a pick-up element deriving a time code signal from a rotating disc, the derived time code signal comprising an absolute time code signal in the audible range;

a filter determining a relative time code signal from the absolute time code signal; and

an output filter controlling reproduction of sound from a sound source,

wherein the speed of rotation of the sound source is based on the absolute time code signal, and

wherein the direction of rotation of the sound source is based on the relative time code signal.

18. The system according to claim 17 , wherein the relative time code signal is determined based on a phase difference between right and left channels of the absolute time code signal.

19. The system according to claim 17 wherein controlling reproduction of sound from the sound source includes one or more of:

controlling the play of sound from the sound source;

controlling the play of music from the sound source;

controlling the play of DVD images from the sound source; and

controlling the play of MP3 images from the sound source.

20. The system according to claim 17 , including a moving average filter detecting a stand-still of the rotating disc.

21. The system according to claim 17 , wherein the sound source comprises a CD player, a DVD player, or a MP3 player.

22. A disc for use in an apparatus for reproduction of sound, comprising:

a disc configured for playing on a rotatable player, the disc including a time code;

an absolute time code in the audible range which, when the disc is played on the player, is representative of the speed and direction of play of the disc; and

a relative time code detected from the absolute time code,

wherein the absolute time code is used to control the speed of play of a sound device for the reproduction of sound, and

wherein the relative time code is used to control the direction of play of the sound device for the reproduction of sound.

23. The disc according to claim 22 , further comprising:

the absolute time code is read while the disc is rotating on the player;

the absolute time code is determined from the rotating disc;

the relative time code is determined from the rotating disc based on a phase difference between channels of the absolute time code; and

the reproduction of sound from the sound device is controlled based on the absolute time code and the relative time code.

24. The disc according to claim 22 , wherein reproduction of sound includes one or more of:

controlling the play of sound from the sound device;

controlling the play of music from the sound device;

controlling the play of DVD images from the sound device; and

controlling the play of MP3 images from the sound device.