| 摘要 |
A voice data processing device is provided to change a frequency of an operation clock based on an empty capacity of a voice data buffer, thereby controlling a reading speed properly in order to prevent overflow or underflow of the voice data buffer. A voice data processing device includes a separation part such as a TS(Transport stream) separation part(10) for separating image data and voice data from each other, and a voice data buffer(20) for recording the separated voice data per voice data packet and reading the recorded voice data continuously. An empty capacity determining part(34) determines an empty capacity of the voice data buffer. A VCXO(Voltage Controlled Crystal Oscillator) control signal generating part(36) outputs an oscillation control signal based on the determination result for the empty capacity. The oscillation frequency of a frequency variable oscillator such as a VCXO(40) is controlled based on the oscillation control signal for outputting operation clocks so that the frequency variable oscillator controls the reading of the voice data from the voice data buffer by the operation clocks.
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