ROM-based audio buffering unit and removing jitter his memory which has a memory function from the jitter removal system methods

摘要

PURPOSE: An apparatus for buffering audio data is provided to have a function of removing a memory jitter caused by an optical pickup jump in a read only memory(ROM) system. CONSTITUTION: An apparatus for buffering audio data in a read only memory(ROM) by removing a memory jitter, comprises an eight to fourteen modulation(EFM) demodulator, an error correcting memory(34), a latch(42), an interface(62), a buffer memory(60), and a memory controller(38). The EFM demodulator separates EFM data into the audio data and sub code data. The EFM demodulator responds to synchronous signals detected from the EFM data, and generates record clock signals. The error correcting memory responds to record addresses to store the audio data, and responds to read addresses to read the audio data. The latch is synchronized with the sub code data. The latch latches sub code synchronous signals output from the EFM demodulator, by responding to read clock signals. The interface outputs the latched sub code data and the read audio data, by responding to the latched sub code synchronous signals and the read clock signals. The buffer memory stores the audio data and the sub code data output from the interface. The memory controller outputs the read clock signals generated by dividing system clock signals. The memory controller outputs the record addresses generated by responding to the record clock signals. The memory controller responds to control signals to unify the read addresses with the record addresses, and outputs the addresses.