Audio system and processing method of storing and reproducing digital pulse width modulation signal
OwnerByoung-min Mun, Hae-kwang Parkinventors
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Abstract
A digital audio system to store and reproduce a digital PWM signal and a method of processing an audio signal. The method includes; converting an audio source signal into a digital pulse width modulation (PWM) signal through a series of signal processing processes and storing the PWM signal in a separate storage medium, when an audio signal is reproduced, reading the digital PWM signal stored in the storage medium and decoding the signal into an analog PWM signal, and performing a power switching operation with the decoded analog PWM signal and extracting an audio signal.
Claims20
A method of processing an audio signal, the method comprising:
- converting an audio source signal into a digital pulse width modulation (PWM) signal and storing the PWM signal in a separate storage medium;
- reading the digital PWM signal stored in the storage medium and decoding the signal into an analog PWM signal;
- and
- performing a power switching operation on the decoded analog PWM signal and extracting an audio signal from the analog PWM signal.
An apparatus to process an audio signal, the apparatus comprising:
- a storage unit to convert a digital audio signal into a PWM signal, to convert the PWM signal into a digital PWM signal, and to store the digital PWM signal;
- and
- a signal reproducing unit to convert the digital PWM signal read from the storage unit, into an analog PWM signal, and to power-switch the analog PWM signal to extract an audio signal from the analog PWM signal.
An audio system comprising:
- an audio generation and storage unit to receive an input of an analog audio signal, to convert the signal into a PCM digital signal, to modulate the PCM digital signal into a digital PWM signal, and to store the digital PWM signal in a separate storage medium;
- and
- an audio reproducing unit to read the digital PWM signal stored in the storage medium, to decode the PWM signal into an analog PWM signal, to power-switch the decoded analog PWM signal, and to extract an audio signal.
A computer readable recording medium containing computer readable codes as a program to perform a method of processing an audio signal, the method comprising:
- converting an audio source signal into a digital pulse width modulation (PWM) signal and storing the PWM signal in a separate storage medium;
- reading the digital PWM signal stored in the storage medium and decoding the signal into an analog PWM signal;
- and
- performing a power switching operation on the decoded analog PWM signal and extracting an audio signal from the analog PWM signal.
An audio system comprising:
- an audio generation and storage unit to receive an analog audio signal, to convert the received signal into a PCM digital signal, to modulate the PCM digital signal into a digital PWM signal, and to store the digital PWM signal in an external storage medium detachably connectable to the audio generation and storage unit.
An audio system comprising:
- an audio reproducing unit to read a digital PWM signal from a memory disposed therein, to decode the PWM signal into analog PWM signal, and to power-switch the decoded analog PWM signal, to generate an audio signal.
Dependencies are inferred from the claim text.