Music and light synchronization system
AssigneesPanasonic Corporation, Panasonic Semiconductor Asia Pte.Ltd.
InventorsChun Kiong Leslie Khoo, Shuang Zhang
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Abstract
An apparatus for synchronizing light signals to a music input signal includes an analog to digital converter to generate a digital signal equivalent of the analog music input signal, an digital signal decoder to generate an output pulse width modulated signal that is representative of the tempo and the volume of the music input signal, a light driver unit that receives the output pulse width modulated signal to correspondingly light up a lighting unit, and a lighting unit that emits light. Thus, light brightness synchronizes with the music volume amplitude, and the light blinks on and off with the music tempo and beating.
Claims3
An apparatus for synchronizing light signals to an analog music input signal having tempo and amplitude, the apparatus comprising:
- an analog to digital converter to generate a digital signal equivalent of said analog music input signal;
- a digital signal decoder to generate an output pulse width modulated signal that is representative of said tempo and said amplitude of said analog music input signal;
- a light driver that receives said output pulse width modulated signal;
- and
- a light that emits light in correspondence with said output pulse width modulated signal received by said light driver,
- wherein said analog to digital converter comprises:
- a first resistor ladder network to provide a DC bias to said analog music input signal to generate a DC biased analog music input signal;
- a second resistor ladder network to generate threshold levels for comparing with said DC biased analog music input signal;
- an auto threshold scanner coupled to said second resistor ladder network to generate a staircase waveform;
- and
- an amplitude comparator to compare said staircase waveform and said DC biased analog music input signal, and
- wherein said digital signal decoder comprises:
- an amplitude detector to store current step information of said staircase waveform for which said amplitude comparator outputs a signal corresponding to an instantaneous amplitude of said analog music input signal;
- a music tempo decoder that receives said current step information to perform an averaging of a plurality of said analog music input signals within a pre-determined time frame to generate a threshold level based on an averaged signal, and compare said threshold level with said instantaneous amplitude of said analog music input signal, so as to output a first pulse width modulated signal;
- and
- a music volume decoder that receives said current step information to produce a second pulse width modulated signal that has a duty cycle linearly proportional to said amplitude of said analog music input signal.
Dependencies are inferred from the claim text.