Playback device

1. A playback device comprising:

a first decoder that processes main audio data to output first audio data;

a microcomputer that processes additional audio data to output second audio data, the microcomputer including a text-to-speech (TTS) engine that generates the additional audio data according to a user operation relative to the playback device in accordance with a settable sampling frequency and a settable playback speed that are settable to the TTS engine, respectively; and

a data processor that combines the first audio data with the second audio data,

while a sampling frequency of the main audio data is different from a sampling frequency of the additional audio data, the microcomputer generating the second audio data to adjust a playback speed of the additional audio data based on the sampling frequency of the main audio data to synchronize the playback speed of the additional audio data with a playback speed of the main audio data,

the microcomputer further determining whether the sampling frequency of the additional audio data is adjustable to the sampling frequency of the main audio data by designating the settable sampling frequency that is settable to the TTS engine,

in response to determining that the sampling frequency of the additional audio data is unadjustable to the sampling frequency of the main audio data by designating the settable sampling frequency that is settable to the TTS engine, the microcomputer adjusting the playback speed of the additional audio data based on the sampling frequency of the main audio data to synchronize the playback speed of the additional audio data with the playback speed of the main audio data by designating the settable playback speed that is settable to the TTS engine independently of designating of the settable sampling frequency that is settable to the TTS engine,

the microcomputer further generating the additional audio data, and adjusting the playback speed of the additional audio data that has been generated by the microcomputer.

2. The playback device according to claim 1 , wherein

while the sampling frequency of the additional audio data is higher than the sampling frequency of the main audio data, a second decoder of the microcomputer generates the second audio data to increase the playback speed of the additional audio data.

3. The playback device according to claim 1 , wherein

while the sampling frequency of the additional audio data is lower than the sampling frequency of the main audio data, a second decoder of the microcomputer generates the second audio data to decrease the playback speed of the additional audio data.

4. The playback device according to claim 1 , wherein

the microcomputer that controls the first decoder and the data processor.

5. The playback device according to claim 4 , wherein

the microcomputer determines a multiple by which the playback speed of the additional audio data is adjusted.

6. The playback device according to claim 4 , wherein

the microcomputer generates first decode data indicative of an encoding type of the main audio data, and outputs the main audio data and the first decode data to the first decoder.

7. The playback device according to claim 6 , wherein

the first decoder generates the first audio data based on the main audio data and the first decode data.

8. The playback device according to claim 7 , wherein

the first decoder decodes the main audio data based on the first decode data to generate the first audio data.

9. The playback device according to claim 4 , wherein

the microcomputer generates second decode data indicative of a multiple by which the playback speed of the additional audio data is adjusted and an encoding type of the additional audio data, and outputs the additional audio data and the second decode data to a second decoder of the microcomputer.

10. The playback device according to claim 9 , wherein

the second decoder generates the second audio data based on the additional audio data and the second decode data.

11. The playback device according to claim 10 , wherein

the second decoder decodes the additional audio data based on the second decode data to generate the second audio data.

12. The playback device according to claim 4 , wherein

the microcomputer outputs the additional audio data based on an operational command to the playback device.

13. The playback device according to claim 1 , wherein

while the sampling frequency of the additional audio data is unadjustable to the sampling frequency of the main audio data, a second decoder of the microcomputer adjusts the playback speed of the additional audio data based on the sampling frequency of the main audio data.

14. The playback device according to claim 1 , wherein

the microcomputer generates the additional audio data with the sampling frequency that has been adjusted to the sampling frequency of the main audio data while the sampling frequency of the additional audio data is adjustable to the sampling frequency of the main audio data.

15. The playback device according to claim 1 , wherein

the microcomputer adjusts the playback speed of the additional audio data that has been generated by the microcomputer while the sampling frequency of the additional audio data is unadjustable to the sampling frequency of the main audio data.

16. The playback device according to claim 13 , wherein

the microcomputer generates the additional audio data based on an operational command to the playback device.

17. The playback device according to claim 16 , wherein

the microcomputer generates the additional audio data by converting text data indicative of the operational command to the playback device into the additional audio data.

18. The playback device according to claim 1 , wherein

the data processor has a converter that processes the second audio data to raise an audio level of the additional audio data while the audio level of the additional audio data is at or below a first threshold value.

19. The playback device according to claim 18 , wherein

the converter further processes the second audio data to lower the audio level of the additional audio data while the audio level of the additional audio data is at or above a second threshold value that is higher than the first threshold value.