将类型为String的消息发布到信道。

Publishes a message of type String to a channel.

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通常，一个给定的语音样本通过语音信道，在编码，分组，传送和解码过程中会遭到不同类型的损伤。

Generally, a given speech sample is played over the speech path, where it presumably undergoes various types of impairments during encoding, packetization, transmission, and decoding.

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针对需要交换多种类型信息的要求，设计了传输协议，实现在通讯信道中的多种信息分时复用传输。

A transmission protocol is designed against the requirement of exchanging more types information, the time division multiplex transmission in communication channel is realized too.

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