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Audio Quality Improvements in a Digital Communication System using an Audio Quality Estimate algorithm in conjunction with a Signal Quality Estimate algorithm

IP.com Disclosure Number: IPCOM000031637D
Original Publication Date: 2004-Oct-02
Included in the Prior Art Database: 2004-Oct-02
Document File: 3 page(s) / 105K

Publishing Venue

Motorola

Abstract

Today's digital communications systems, including iDEN, GSM, CDMA, incorporate one or more vocoders running at some predetermined bit rate. Carriers sometimes choose one vocoder over another to trade off voice quality with call capacity. In a communication system such as the current iDEN system, we propose a method of providing feedback to the FNE (Fixed Network Equipment) such that an intelligent decision can be made to choose one of two or more vocoder schemes to maximize audio quality and at the same time try to provide the most capacity possible.

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"Audio Quality Improvements in a Digital Communication System using an Audio Quality Estimate algorithm in conjunction with a Signal Quality Estimate algorithm."

Gustavo Leizerovich and Jeffrey L. Cutcher Motorola - iDEN Technology Group

8000 West Sunrise Blvd. Plantation, Florida 33322

ABSTRACT

     Today's digital communications systems, including iDEN, GSM, CDMA, incorporate one or more vocoders running at some predetermined bit rate. Carriers sometimes choose one vocoder over another to trade off voice quality with call capacity. In a communication system such as the current iDEN system, we propose a method of providing feedback to the FNE (Fixed Network Equipment) such that an intelligent decision can be made to choose one of two or more vocoder schemes to maximize audio quality and at the same time try to provide the most capacity possible.

SUMMARY OF IDEA

     Current schemes, such as SQE (Signal Quality Estimator) to enable an attenuator, only solve channel and interference problems that indirectly cause audio degradations. In cases where signal quality is high, the audio quality has the potential of still being degraded due to the interactions of the network path and the vocoder.

     With an absolute audio quality estimate algorithm such as Psytechnics NiQA (Non- intrusive Quality Algorithm - http://www.psytechnics.com/pages/products/niqa.php) in conjunction with a signal quality estimate (SQE) within the handset and the base station, we can make an intelligent decision during a call as to the current quality of the audio. Both the audio quality and signal quality information would be fed back to the FNE, where a decision would be made as to whether a different vocoder should be selected. The call would always start with the lowest rate vocoder to allow for maximum capacity. Once audio quality has been deemed degraded below some threshold, the vocoder would be changed within the call to the next higher...