supplementary
发表于 2025-3-21 19:32:21
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法律的瑕疵
发表于 2025-3-21 21:27:14
Speech Digitization Fundamentals,form to a series of ones and zeros. A multitude of speech digitization methods has been devised; these methods can be categorized as waveform, parametric, and hybrid coding. A . takes the actual waveform and produces a series of ones and zeros representative of that waveform according to a set of ru
Cougar
发表于 2025-3-22 04:16:53
Pulse Code Modulation, To clarify the concept, however, the first point to be made is that PCM . coding, but it . necessarily the modulation of the carrier. Modulation usually refers to an alteration of a periodic function (often a radio frequency sine wave) to cause it to convey intelligence. This alteration may be a ch
骑师
发表于 2025-3-22 06:40:51
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盖他为秘密
发表于 2025-3-22 10:05:59
Digital Techniques in the Telephone Network,on and time-division multiplexing and then covers the basic functions of error coding, scrambling and channel coding. Figure 5-1 relates these functions to one another as well as to source coding as they might be found in a generalized digital transmission system. Signaling and supervision are cover
Mhc-Molecule
发表于 2025-3-22 15:15:52
Digital Transmission,.e.r.) to assure satisfactory performance of the system from the users’ viewpoints. This means, for voice, a bit error rate that generally does not exceed 10., since 64-kb/s PCM performance is quite good if the b.e.r. is kept to this value or lower. Other voice coding techniques, such as ADPCM, can
Mhc-Molecule
发表于 2025-3-22 20:55:26
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LAVE
发表于 2025-3-23 00:21:18
Satellite Transmission,he first commercial satellite, in 1965. Numerous military satellite systems parallel the development of the commercial systems. The first domestic commercial satellite was Telesat’s . (Canadian), followed by Western Union’s . (U.S.). Because of the predominance of analog voice communication during t
Hangar
发表于 2025-3-23 03:04:08
The Circuit Switching Environment,igned 50 or 60 years ago to the very latest digital switching systems. Signaling systems are the languages used by switching systems to “talk” to each other. Some signaling systems were designed to be used only on metallic conductors. Others employ signaling concepts suitable for use over derived ci
Stress-Fracture
发表于 2025-3-23 08:29:21
Digital Switching Architecture,itching network. Several fundamental questions must be answered, and each must then be followed by a large number of decisions, most of which involve trade-offs. Some of the most prominent questions which require major decisions up front are: