Development of vocoder board for speech compression at three different rates
نویسنده
چکیده
Compression of speech signal is an important field in digital signal processing. Because of limited bandwidth in many fields especially in the field of military speech compression has a significant importance in the present world. The other reasons for speech compression are limited transmission and storage capacity. The process of converting human speech signals into encoded representation then converting back into original signal by decoding back to produce a close approximation of the original signal. This paper presents a speech compression by designing a low bit rate Vocoder board. The process includes component selection for doing schematic followed by PCB design. The final board is tested by giving speech input of different languages and then calculating PESQ of both input and compressed speech.
منابع مشابه
Effect of MPEG audio compression on HMM-based speech synthesis
In this paper, the effect of MPEG audio compression on HMMbased speech synthesis is studied. Speech signals are encoded with various compression rates and analyzed using the GlottHMM vocoder. Objective evaluation results show that the vocoder parameters start to degrade from encoding with bitrates of 32 kbit/s or less, which is also confirmed by the subjective evaluation of the vocoder analysis...
متن کاملA Glottal Vocoder Employing Vector Quantization
This paper describes a speech coder for low bit rates using a parametric representation of voiced excitation waveforms (Glottal ARX) and standard LPC for unvoiced. For efficient compression purposes the excitation and spectrum parameters are quantized with vector quantization (VQ). This has resulted in a glottal vocoder operating at 1320 bits/s and sounding more natural than a standard LPC voco...
متن کاملUsing FFI Interpolator and VQ Quantization for Designing of High Quality 1200 BPS Speech Vocoder
Storaging or transmission of speech signals at very low bit rate is a hot area in the field of speech processing. We used stochastic inter-frame interpolators and vector quantization (VQ) as a new method for developing a high quality 1200 BPS speech vocoder. The objective and subjecgtive test results show that performance of the new vocoder is compairable with 4800 BPS standard vocoders (as CELP).
متن کاملبررسی درک گفتار با فشردگی زمانی در سالمندان
Objectives: Most of the studies performed on aging and auditory system have historically focused on speech perception disorders in elderly people. According to studies, speech discrimination disorders in aged people usually result from auditory temporal processing impairment. Our study was done to determine the ability of aged people to discriminate time compressed speech. Methods & Material...
متن کاملUsing FFI Interpolator and VQ Quantization for Designing of High Quality 1200 BPS Speech Vocoder
Storaging or transmission of speech signals at very low bit rate is a hot area in the field of speech processing. We used stochastic inter-frame interpolators and vector quantization (VQ) as a new method for developing a high quality 1200 BPS speech vocoder. The objective and subjecgtive test results show that performance of the new vocoder is compairable with 4800 BPS standard vocoders (as CELP).
متن کامل