. Mel Frequency Conversion – Once the set of frequencies are obtained from FFT, they can be converted into mels with the conversion function stated earlier, reproduced here: . Discrete Cosine Transform (DCT) – The last step in finding the MFCCs of a speech sample is performing a discrete cosine transform of the base-10 logarithm of the mels obtained in the step above. A discrete cosine transform is similar to a Fourier transform in that data is represented as a sum of sinusoids each with frequencies and amplitudes. In the case of DCTs, a set of finite, discrete points are represented as a sum of cosines with amplitudes. Though are many “types” of DCT including inverse functions, we will examine DCT-II, the most commonly used DCT. The DCT-II function is for all k = 0 to N-1. Although a sum of cosines is obtained from this function, only the amplitudes of each given frequency is necessary – these amplitudes for the frequencies compose the mel frequency cepstral coefficients. MFCC aren’t only useful in speaker recognition applications. Researchers have found that the use of MFCC in recognizing MP3 encoded music is shown to be very robust. Making use of this method are a collection of mobile smart phone “apps” that allow users to determine the artist, title, album name, or other piece of information about a song by having their phone “listen” to a sample of the music (holding it up to a stereo playing the song). (Trivial note: The word “cepstral” is actually derived by reversing the first four letters in “spectral”.) For the purposes of our senior design project, we will be using mel frequency cepstral coefficients as our feature selection method. Methods of Pattern Matching Feature selection occurs prior to pattern matching against a database of known values for the features chosen. Pattern matching can be considered the final step in speaker recognition (verification) if the decision process is included. We will
that PIC has acknowledge first identification, then green LCD on voice panel will turn on, indicated that system need the second identification which is the voice data. Person is going to speak his/her password. Once both data have matched with memory data, then PIC will release the door contact. The solenoid release with the click sound, door is unlocked and both LCD turn red, ready for next identification. If the profile doesn’t match the system, PIC will command LEDs on reader and voice panel turn red which is normal condition, no action to the door. The RFID card wills timeout in about 5-7 second if there is no action which is repeated wrong voice profile. The system is waiting for the next card in range. If the reader did not recognize the valid card in the first place then nothing happen, no action follow up for voice active either. Reader works as the filter to activate the voice system. After the person get in to unsecure side, the door will be close and lock by hearing a solenoid’ click. On this side, we have designed a request to exit push button. Once the button press, door will unlock, following a click sounding from the solenoid. For any others complicate operation, it can happen but it should be consideration for the future design. Hardware Summary All the hardware will be furnished to complete the project and shall meet all requirements of specifications and all other codes as applicable. Items of hardware specified in the document have been selected for the purpose of establishing a quality and design standard acceptable to the school project level. Products of other manufacturers of security hardware only may be substituted in later of the project. Security equipment items specified in the security hardware sets have been selected from the catalogs of HID Global Corporation as the basis of design for the card access control. The design of the security hands free entry system include devices and equipment to control access of cardholders and assets to restricted area (door), detect and deny unauthorized attempted entry. The security hands free
PROJECT SCHEDULE- SD1 Date Anh Nguyen Jordan Acedera Christopher Spading John E. Van Sickle 9/27/2011 Proposal: Introduction/ Cost Analysis and Block Diagram Description Proposal: Verifications, Testing Procedures, Block Diagram Proposal: Introduction/ Diagram Description Proposal: Introduction/ Block Diagram Description 10/20/2011 Research Antenna System, Proximity Key, Reader Research Voice Recognition Research PIC Microcontroller Research Electric Door Lock 10/25/2011 Prepare Table of Content Prepare Table of Content Prepare Table of Content Prepare Table of Content 11/16/2011 Drafting report for WCF/Mentor Meeting Drafting report for WCF/Mentor Meeting Drafting report for WCF/ Mentor Meeting Drafting report for WCF/ Mentor Meeting 12/5/2011 Finished SD1 Paper Finished SD1 Paper Finished SD1 Paper Finished SD1 TABLE 9.1.1: PROJECT MILESTONE SD1 The duration for each stage of our project for senior design II is depicted in table 9.1.2. The primary focuses were the Speak recognition circuit and PIC microcontroller circuit. We have met all the dead line. PROJECT SCHEDULE SD-2 Date Anh Nguyen Jordan Acedera Christopher Spading John E. Van Sickle 1/15/2012 Order Card Reader, Reader converter, Tags Order Voice Recognition System Order PIC Microcontroller System Order Door Hardware System 01/23/2012 Test Antenna/Help Programming Microcontroller Begin designing the Voice Activation Programming Microcontroller Begin designing the Electric Door Lock 02/06/2012 Test Reader/Prepare Document Continue designing Activation Programming Microcontroller Test Helping Microcontroller/ Helping Test 02/16/2012 WCF Meeting WCF Meeting WCF Meeting WCF Meeting