روشی جدید در تشخیص گوینده مستقل از متن در محیط‌های نویزی

محورهای موضوعی : پردازش سیگنال و سیستم

نونا حیدری اصفهانی ¹ , حمید محمودیان ²

1 - کارشناس ارشد، شرکت پرشیان فولاد اصفهان
2 - استادیار - دانشکده برق، دانشگاه آزاد اسلامی، واحد نجف آباد

تاریخ دریافت : 1392/05/01 تاریخ پذیرش : 1393/03/01 تاریخ انتشار : 1393/09/10

کلید واژه: MLP, آنتروپی شانون, بازشناسی گوینده, ضرایب MFCC, فرکانس پایه, فرمنت‌,

چکیده مقاله :

در این مقاله بازشناسی مقاوم به نویز گوینده در حالت مستقل از متن مورد توجه قرار گرفته است. روش پیشنهادی بر مبنای حذف سکوت از جملات و تقطیع آنها به واحدهای کوچک‌تر شامل چند آوا و حداقل یک واکه برای استخراج ویژگی‌های زمان‌بلند از جمله آنتروپی عمل می‌کند. یک واکه پرانرژی در هر قطعه گفتاری برای استخراج فرکانس پایه و فرمنت‌ها شناسایی می‌شود. با اعمال یک روش خوشه‌بندی، ویژگی‌های زمان‌کوتاه یعنی ضرایبِ MFCC با ویژگی‌های زمان‌بلند ترکیب می‌شوند. نتایج آزمایشات با استفاده از طبقه‌بندی کننده از نوع MLP نشان می‌دهد که میانگین نرخ بازشناسی گوینده با روش پیشنهادی در حالت بدون نویز 33/97% و در نسبت سیگنال به نویز 2- دسی‌بل 33/61% است که نسبت به روش‌های متداول بهبود نشان می‌دهد.

چکیده انگلیسی:

In this paper, robust text-independent speaker recognition is taken into consideration. The proposed method performs on manual silence-removed utterances that are segmented into smaller speech units containing few phones and at least one vowel. The segments are basic units for long-term feature extraction. Sub-band entropy is directly extracted in each segment. A robust vowel detection method is then applied on each segment to separate a high energy vowel that is used as unit for pitch frequency and formant extraction. By applying a clustering technique, extracted short-term features namely MFCC coefficients are combined with long term features. Experiments using MLP classifier show that the average speaker accuracy recognition rate is 97.33% for clean speech and 61.33% in noisy environment for -2db SNR, that shows improvement compared to other conventional methods.

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