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Why POLQA has become the latest standard for voice quality assessment? Explore the secrets behind it!
Since 2011, POLQA (Perceptual Objective Listening Quality Assessment) has gradually become a new standard for speech quality assessment. This standard not only provides an objective method for evaluating voice quality, but also can be connected with subjective scoring, and has important technical significance and market value. The POLQA standard was created to meet the growing demand for high-quality voice, especially in the communications and multimedia fields. So, what secrets are hidden behind POLQA’s success?
POLQA is a model based on analysis of digital speech signals, whose purpose is to predict the subjective quality score as accurately as possible.
Foundation and Development of POLQA
The development history of POLQA can be traced back to 2006, when IEEE experts began to develop this standard. As digital communication technology advances, the methods for evaluating voice quality are also evolving. The emergence of POLQA originated from the improvement of its predecessor PESQ (Perceptual Evaluation of Speech Quality). Compared with PESQ, POLQA overcomes many technical deficiencies and expands the processing capabilities of higher bandwidth audio signals.
According to the latest POLQA standard, it can not only evaluate the commonly used telephone sound quality (300-3400 Hz), but also support the evaluation of wideband and ultra-wideband voice signals (50-14000 Hz), improving the adaptability to various types of voices.
POLQA is considered a full-reference algorithm, which means that it requires a comparison with the original signal to assess the degree of speech quality degradation.
Technical Features of POLQA
The core of POLQA's technology lies in its perceptual model, which focuses on sound distortion and its impact on the human ear. Current research shows that POLQA can accurately assess speech quality losses caused by various factors, such as background noise, echo, or frequency distortion.
The operation begins with the short-term time alignment of the original and degraded signals, followed by sampling rate estimation and necessary resampling. This process ensures that all test signals are compared on the same basis, improving accuracy.
Its output is easily mapped onto a 1 to 5 quality rating scale, making the results easy to understand and apply.
Test types and application scenarios
POLQA is not only suitable for indoor quality testing, but also for evaluation in real on-site environments. These features make it an ideal tool for connecting to mobile networks and VoIP applications. As communications technology evolves toward 5G and higher bandwidth loads, the application scope of POLQA will continue to expand.
In addition, POLQA is also widely used in academic research to help analyze the objective properties of speech and promote the advancement of speech processing technology. Various research projects, especially in the field of speech recognition and voice communication, use POLQA as a benchmark and demonstrate good results.
ConclusionThe development of POLQA is not only a technological advancement, but also reflects people's desire for high-quality communications.
The emergence of POLQA is undoubtedly an evolution of speech quality assessment technology. It breaks through the limitations of traditional methods through precise model calculations. With further development of technology and driven by demand, POLQA may even become a more comprehensive speech assessment standard in the future. However, it is worth thinking about whether we can continue to meet people’s high expectations for sound quality as communication technology develops rapidly?
