System and method for controlling play of digital audio equipment
An apparatus for signal processing, wherein a disc is placed on a turntable and is provided with a groove which can be followed by the pick-up element, and employing a time-code signal wherein during use of the disc the said time-code signal controls the digital audio source.
1. A system for controlling play of digital audio equipment, the system comprising:
a disc including a control signal indicative of speed of disc play, directionality of disc play, and place on the disc of play,
wherein the disc includes a carrier frequency in the audible range between 20 and 20,000 Hz with an absolute control signal indicative of position of play on the disc;
a digital filter processing the control signal to determine a relative control signal based on the difference between a left and right channel of the control signal,
wherein the relative control signal indicates directionality of disc movement; and
an output filter utilizing the absolute control signal and the relative control signal to determine an accurate control signal serving to control play of the digital audio equipment.
2. The system according to claim 1 , wherein controlling play of the digital audio equipment includes controlling the speed of play of the digital audio equipment.
3. The system according to claim 1 , wherein controlling play of the digital audio equipment includes controlling the direction of play of the digital audio equipment.
4. The system according to claim 1 , wherein play of the digital audio equipment comprises the play of music.
5. The system according to claim 1 , wherein play of the digital audio equipment includes producing, without noticeable delay, a scratch sound effect based on the speed and direction of play of the disc.
6. The system according to claim 1 , wherein the digital audio equipment comprises a CD player, a DVD player, or an MP3 player.
7. A method for controlling play of digital audio equipment, the method comprising:
processing a disc on a turntable, wherein the disc comprises an absolute control signal and a carrier frequency;
deriving the absolute control signal from the carrier frequency, wherein the absolute control signal comprises at least one of a right channel and a left channel, and wherein the carrier frequency is in the audible range between 20 and 20,000 Hz;
determining a relative control signal by detecting a phase difference between the right channel and the left channel, wherein the relative control signal is determinative of the direction of movement of the disc;
utilizing the absolute control signal together with the relative control signal to determine an accurate control signal; and
utilizing the accurate control signal to control play of digital audio equipment.
8. The method according to claim 7 , wherein controlling play of the digital audio equipment includes controlling the speed of play of the digital audio equipment.
9. The method according to claim 7 , wherein controlling play of the digital audio equipment includes controlling the direction of play of the digital audio equipment.
10. The method according to claim 7 , including producing a scratch sound effect with the controlled digital audio equipment.
11. The method according to claim 7 , wherein the absolute control signal is indicative of position of play on the disc.
12. The method according to claim 7 , wherein the play of the digital audio equipment comprises the play of music.
13. The method according to claim 7 , further comprising detecting a stand-still of the disc.
14. A method for play of sound from an audio source, comprising:
processing a disc rotationally on a turntable, wherein the disc comprises an absolute time-code signal;
deriving the absolute time-code signal from a carrier frequency, wherein the derived time-code signal comprises at least one of a right channel and a left channel;
determining a relative time-code signal by detecting a phase difference between the right channel and the left channel, wherein the relative time-code signal is determinative of the direction of movement of the disc;
utilizing the absolute time-code signal together with the relative time-code signal to determine an accurate time-code signal; and
utilizing the accurate time-code signal to control play of sound from an audio source.
15. The method according to claim 14 , wherein the play of sound from the audio source comprises the play of music.
16. The method according to claim 14 , wherein the accurate time-code signal controls one or more of speed of audio source play, directionality of audio source play, and place of play on the audio source.
17. The method according to claim 14 , wherein play of sound includes producing a scratch sound effect based on the speed and direction of play of the disc.
18. A system for controlling a digital audio source, comprising:
a turntable;
a disc comprising time-code signals,
wherein the time-code signals include absolute time-code signals carried in the audible range of 20 to 20,000 Hz;
a pick-up element deriving the time-code signals from the disc while the disc is rotating on the turntable;
a filter determining accurate time-code signals from the derived time-code signals; and
a receiver using the accurate time-code signals to control a digital audio source.
19. The system according to claim 18 , wherein a relative time-code is determined based on a phase difference between right and left channels of the derived time-code signals, and wherein the relative time-code is used to control the direction of the digital audio source.
20. The system according to claim 19 , wherein the accurate time-code signals are determined from the absolute time-code signals and the relative time-code signals.
21. The system according to claim 18 , wherein at least the direction and speed of the digital audio source is controlled with the accurate time-code signals.
22. The system according to claim 18 , wherein control of the digital audio source comprises the play of music.
23. The system according to claim 18 , wherein control of the digital audio source includes producing a scratch sound effect based on the speed and direction of play of the disc.
24. The system according to claim 18 , wherein the accurate time-code signals control one or more of speed of digital audio source play, directionality of digital audio source play, and place of play on the digital audio source.
25. The system according to claim 18 , wherein control of the digital audio source includes detecting a stand-still of the disc.
26. The system according to claim 18 , wherein the digital audio source comprises a CD player, a DVD player, or an MP3 player.