IS-101 Voice Mode AT Commands

Table 25. Voice Mode Command Descriptions (Continued)

Command Default

Description

Compression Method Selection: This command contains four parameters that specify the voice compression method, voice sampling rate, silence compression sensitivity, and the degree of silence expansion. The DCE can support different capabilities for each compression method.

m= <cml>, <vsr>, <scs>, <sel>

Defaults: m = 140, 8000, 0, 0

<cml> Compression Method: This parameter selects a voice compression method. The DTE can obtain the label and a string constant identifier by using the +VSM? command.

Range: 0–2, 128, 129, 132, 140, 141

0LIN1: 8-bit Linear PCM (pulse code modulation) sampling using twos-complement signed numbers

1LIN2: 16-bit Linear PCM sampling using unsigned numbers

2AD4: 4-bit Adaptive differential pulse code modulation

128LIN1: 8-bit Linear PCM (pulse code modulation) sampling using twos-complement signed numbers

129LIN2: 16-bit Linear PCM sampling using unsigned numbers

 

 

132

AD4: 4-bit Adaptive differential pulse code modulation

 

 

140*

CL1: 8-bit Intel A-law

 

manufac-

141

AD3: 3-bit Adaptive differential pulse code modulation

 

<vsr> Sampling Rate: This parameter selects the DCE voice sampling/digitizing rate for the voice

+VSM=m

turer-

signal. The supported sampling rates are dependent on the compression schemes used. Use the

 

specified

 

+VSM=? command to obtain supported sampling rates.

 

 

 

 

Range: 4800, 7200, 8000, and 11025 samples/second

 

 

4800

Default used by previous Intel modems

 

 

7200

 

 

 

8000*

Used by some bulletin boards

 

 

9600

 

 

 

11025

Used by many Windows* WAV files

<scs> Silence Sensitivity: The function of this parameter depends on whether the DTE is transmitting or receiving in voice mode. The DTE can modify the silence expansion using the <sel> parameter. When transmitting voice, a non-zero value of this parameter informs the DCE that the data stream was recorded with silence compression.

Transmission: Range: 0

0*Disabled

When receiving voice, this parameter changes the level of noise that the DCE treats as silence. A higher ‘n’ number raises the threshold of noise detection.

Reception: Range: 0

 

0*

Disables DCE silence compression

increments of 1

Raises noise detection threshold

NOTE: An asterisk (*) denotes the factory-default setting.

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536EX Chipset Developer’s Manual

Intel Confidential

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Intel 537EX manual 141 AD3 3-bit Adaptive differential pulse code modulation, +VSM=m
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537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.
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