應科院ARM9E
ITU-T CPT 編碼器(暫時只提供英文版本) |
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Processor
ARM ARM9E family and above with DSP extensions
Background
CPT (Call-Progress Tones) are signaling tones used in the
telephone services to indicate the status of the calling
process. National governments specified CPT using different
values of cadences, frequencies and levels.
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Implementation
according to ITU-T E180/Q35 |
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Signal
design based on ITU-T E180/Q35 Annex A recommendation |
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CPT
signal sampling frequencies: 8KHz |
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Provides
mono output |
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| ASTRI
Specific Features |
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Provides
multiple-encoder instance |
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Provides
four CPT tones: Dial tone, Ringing tone, Busy tone
and Congestion tone
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User-defined
signal levels on-the-fly
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Provides
API for streaming application
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OS
compatibility: Embedded Linux (Monta Vista, Candenux),
Non-OS, ARM RealView
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Memory requirements: 11KByte (Program and Data) |
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| Performance |
| ASTRI
ARM9E ITU-T CPT encoder is optimized for the ARM9E architecture.
The performance is depended on several factors of the target
ARM9E platform: |
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I-Cache
size |
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D-Cache
size |
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SDRAM
speed |
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Availability of TCM |
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| Please
make enquires on the performance for a specific ARM9E platform. |
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