METHOD FOR SIGNAL PROCESSING AND AN APPARATUS THEREFORE
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 method for controlling a digital audio source, comprising:
playing a disc on a turntable, wherein the disc comprises control signal;
following a groove in the disc with a pick-up element, wherein the control signal is derived from the disc by the pick-up element;
modulating the control signal on a carrier frequency in the audible range between 20 and 20,000 Hz;
demodulating the control signal; and
reading the demodulated control signal into a receiver to provide control of a digital audio source.
2 . The method according to claim 1 , wherein the control signal comprises a time-code signal.
3 . The method according to claim 2 , wherein the disc comprises only time-code signals.
4 . The method according to claim 1 , including applying an absolute time-code control signal on the disc.
5 . The method according to claim 1 , wherein control of the digital audio source includes controlling the speed of the play of the digital audio source.
6 . The method according to claim 1 , wherein control of the digital audio source includes controlling the direction of the play of the digital audio source.
7 . The method according to claim 6 , including detecting a phase difference between the control signal demodulated from a right channel and a left channel for determining the direction of play for the digital audio source.
8 . The method according to claim 1 , including producing a scratch effect by the digital audio source.
9 . The method according to claim 1 , wherein the digital audio source plays music while under the control of the demodulated control signal.
10 . The method according to claim 1 , wherein the control signal is modulated on a single channel.
11 . The method according to claim 1 , wherein digitally recorded fragments can be located for play on the digital audio source with the demodulated control signal.
12 . The method according to claim 1 , wherein the digital audio source comprises a CD player, a DVD player, and an MP3 device.
13 . The method according to claim 1 , further comprising:
deriving a signal from the disc by the pick-up element, wherein the disc is a conventional analogue vinyl record;
feeding the derived signal into a mixing table;
feeding the modulated control signal into a digital filter; and
using the output of the digital filter to control the digital audio source.
14 . A method of using a time-code signal to control a digital audio source, comprising:
playing a disc on a turntable, wherein the disc includes time-code signals;
deriving a time-code signal from the disc while the disc is being played on the turntable;
modulating the derived time-code signal on a carrier frequency in the audible range between 20 and 20,000 Hz;
feeding the modulated time-code signal into a digital filter;
demodulating the time-code signal; and
reading the demodulated time-code signal into a receiver to provide control of a digital audio source.
15 . An apparatus for controlling a digital audio source, comprising:
a turntable;
a disc comprising a time-code signal, wherein the disc is placed on the turntable;
a pick-up element deriving a time-code signal from the disc on the turntable;
a carrier frequency in the audible range of 20 to 20,000 Hz for modulating the time-code signal from the pick-up element;
a filter for demodulating the time-code signal; and
a time-code receiver for receiving the demodulated time-code signal to be used to control a digital audio source.
16 . The apparatus according to claim 15 , including a digital audio source controlled by the demodulated time-code signal.
17 . The apparatus according to claim 16 , wherein the digital audio source comprises a CD player, a DVD player, and an MP3 device.
18 . The apparatus according to claim 15 , wherein the speed of the play of a digital audio source is controlled by the apparatus.
19 . The apparatus according to claim 15 , wherein the direction of the play of a digital audio source is controlled by the apparatus.
20 . The apparatus according to claim 15 , wherein the modulated time-code signal comprises a right channel and a left channel.
21 . The apparatus according to claim 20 , wherein the direction of the play of a digital audio source is controlled by detecting a phase difference between the right channel and the left channel.