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dsPIC30F Speech Encoding/Decoding Library
Summary
The dsPIC30F Speech Encoding/Decoding Library performs
toll-quality voice compression and voice decompression. The
library is based on a modified version of Speex source code
and features a 16:1 compression ratio. It samples speech
at 8 kHz and compresses it to a rate of 8 kbps. Storing
compressed speech for playback requires approximately
1 KByte of memory for each second of speech. The library is
especially suitable for the following voice-based applications:
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Answering machines
Building and home safety systems
Intercoms
Smart appliances
Voice recorders
Walkie-talkies
Any application using message playback
Description
The Speech Encoding/Decoding Library is a modified
version of the Speex speech coder made specifically for
the dsPIC30F family of Digital Signal Controllers (DSCs).
Encoding uses Code Excited Linear Prediction (CELP), which
is a popular coding technique. CELP provides a reasonable
trade-off between performance and computational complexity.
The library samples speech at 8 kHz and compresses it to
a rate of 8 kbps. The library is appropriate for half-duplex
systems, such as answering machines, intercoms and walkie-
talkies. With the decoder’s small footprint, the library is also
ideal for playback-only applications, such as building safety
systems and smart appliances.
Predominantly written in assembly language, the Speech
Encoding/Decoding Library optimizes computational
performance and minimizes RAM usage. A well-defined API
makes it easy to integrate with your application.
A flexible analog interface gives your design several
options to consider. The speech encoder samples speech
at 8 kHz using either an external codec or the on-chip
12-bit analog-to-digital converter. The speech decoder
plays decoded speech through an external codec or the
on-chip pulse-width-modulator (PWM).
A PC-based Speech Encoder Utility program (pictured above)
allows you to create your own encoded speech files for
playback. Encoded speech files are made from either a PC
microphone or existing WAV file. Once you create the encoded
speech files, they are added to your MPLAB?C30 project, just
Features
Key features of the Speech Encoding/Decoding Library include:
? Fixed 8 kHz sample rate
? Fixed 8 kbps output rate
? PESQ-based Mean Opinion Score: 3.7 – 4.2 (out of 5.0)
? Code Excited Linear Prediction (CELP)-based coding
? Two analog input interfaces – codec or on-chip 12-bit ADC
? Two analog output interfaces – codec or on-chip PWM
? Optional Voice Activity Detection
? Playback-only applications will benefit from the Speech
Encoder Utility. It allows you to make encoded speech
files from your desktop using a PC microphone or WAV file
? Storing compressed speech requires 1 KB of memory per
second of speech
? Off-chip support for playback of long speech samples
? Royalty free (only one-time license fee)
? Full compliance with Microchip MPLAB?C30 Language
Tools
? dsPIC30F Speech Encoding/Decoding Library User’s
Guide is provided to help the user understand and use
the library (DS70154)
? Designed to run on dsPICDEM? 1.1 General Purpose
Development Board (DM300014)
like a regular source file, and built into your application.
The Speech Encoder Utility allows you to select four target
memory areas to store your speech file: program memory,
data EEPROM, RAM and external flash memory. External flash
memory allows you to store many minutes of speech
(1 minute of speech requires 60 KB) and it is supported
through a dsPIC30F general purpose I/O port.
M i c r o c h i p Te c h n o l o g y I n c o r p o r a t e d
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相关代理商/技术参数
SW300080-100K 功能描述:开发软件 Line Echo Cancel. Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300080-25K 功能描述:开发软件 Line Echo Cancel. Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300080-5K 功能描述:开发软件 Line Echo Cancel. Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300080-EVAL 功能描述:开发软件 Line Echo Cancel. Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300090-100K 功能描述:开发软件 Speech Encoding/ Decoding Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300090-25K 功能描述:开发软件 Speech Encoding/ Decoding Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300090-5K 功能描述:开发软件 Speech Encoding/ Decoding Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors
SW300090-EVAL 功能描述:开发软件 Speech Encoding/ Decoding Lib RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors