Vocoder Development: Difference between revisions

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== Introduction ==
== Introduction ==
In the 1950s, Lincoln Laboratory conducted research on detecting pitch in speech, which subsequently influenced the development of voice coders, commonly known as vocoders. The term "vocoder" is derived from "voice" and "coder." These devices are designed to decrease the amount of bandwidth required for transmitting speech. This reduction in bandwidth offers two advantages: it reduces the cost of transmitting and receiving speech, while also enhancing the potential for maintaining privacy.<ref>https://ccrma.stanford.edu/files/papers/stanm55.pdf</ref>
The term "vocoder" is derived from "voice" and "coder",  first emerged in the 1930s,  and was initially conceived for telecommunication purposes. In the 1950s, Lincoln Laboratory conducted research on detecting pitch in speech, which subsequently influenced the development of voice coders, commonly known as vocoders. These devices are designed to decrease the amount of bandwidth required for transmitting speech. This reduction in bandwidth offers two advantages: it reduces the cost of transmitting and receiving speech, while also enhancing the potential for maintaining privacy.<ref>https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=6fb19070c1314f599ecbd134672df89fba037155</ref>


Initially, it described a device designed to compress speech for efficient transmission over telephone lines. The idea involved splitting speech into parts using filters and then reconstructing it on the other end. The goal was to save bandwidth, but in practice, it fell short due to the need for numerous filters to maintain speech quality. Additionally, the original vocoder only transmitted loudness, not sound quality.
Initially, it described a device designed to compress speech for efficient transmission over telephone lines. The idea involved splitting speech into parts using filters and then reconstructing it on the other end. The goal was to save bandwidth, but in practice, early vocoders faced challenges in preserving the natural quality of speech. Additionally, the original vocoder only transmitted loudness, not sound quality. <ref name=":0">https://ccrma.stanford.edu/files/papers/stanm55.pdf</ref>


Subsequently, the "phase vocoder" emerged as an enhanced version, preserving both loudness and sound quality. Further refinements by various researchers improved the method's efficiency without compromising audio fidelity. <ref>https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=6fb19070c1314f599ecbd134672df89fba037155</ref>
As technology advanced, the phase vocoder emerged, preserving both the loudness and sound quality of speech. The phase vocoder is a significant advancement in vocoder technology and plays a pivotal role in modern speech synthesis and audio signal processing. It was developed to address critical limitations in early vocoders and revolutionized the way we process and manipulate audio signals. <ref name=":0" />


== Historical Context ==
== Historical Context ==

Revision as of 13:15, 14 October 2023

Introduction

The term "vocoder" is derived from "voice" and "coder", first emerged in the 1930s, and was initially conceived for telecommunication purposes. In the 1950s, Lincoln Laboratory conducted research on detecting pitch in speech, which subsequently influenced the development of voice coders, commonly known as vocoders. These devices are designed to decrease the amount of bandwidth required for transmitting speech. This reduction in bandwidth offers two advantages: it reduces the cost of transmitting and receiving speech, while also enhancing the potential for maintaining privacy.[1]

Initially, it described a device designed to compress speech for efficient transmission over telephone lines. The idea involved splitting speech into parts using filters and then reconstructing it on the other end. The goal was to save bandwidth, but in practice, early vocoders faced challenges in preserving the natural quality of speech. Additionally, the original vocoder only transmitted loudness, not sound quality. [2]

As technology advanced, the phase vocoder emerged, preserving both the loudness and sound quality of speech. The phase vocoder is a significant advancement in vocoder technology and plays a pivotal role in modern speech synthesis and audio signal processing. It was developed to address critical limitations in early vocoders and revolutionized the way we process and manipulate audio signals. [2]

Historical Context

Chenyi

Key Innovations

Amber

Impact

Wenjun

Future Research

Alice

LLM Review

Erin

References

Team Members

Alice Vanni, Amber, Chenyi, Erin Shi, Wenjun