Texas Instruments Corporation

Toshiaki Yoshino

Periagaram K Rajasekaran

Lynette C Liu

An interleaved all-pass section for a lattice wave digital filter, comprises a first input carrying an interleaved signal, a first adder/multiplier network (AMN) connected to said first input, a second adder/multiplier network (AMN), and a delay element connected between said first AMN and said second AMN, wherein said delay element causes the propagation of signals from said first AMN to said second AMN to be delayed sufficiently to enable said second AMN and said first AMN to process separate signals in parallel.

System and method for filtering using an interleaved/retimed architecture

Speaker-independent word recognition method and system for identifying individual spoken words based upon an acoustically distinct vocabulary of a limited number of words. The word recognition system may employ memory storage associated with a microprocessor or microcomputer in which reference templates of digital speech data representative of a limited number of words comprising the word vocabulary are stored. The word recognition system accepts an input analog speech signal from a microphone as derived from a single word-voice command spoken by any speaker. The analog speech signal is directed to an energy measuring circuit and a zero-crossing detector for determining a sequence of feature vectors based upon the zero-crossing rate and energy measurements of the sampled analog speech signal. The sequence of feature vectors are then input to the microprocessor or microcomputer for individual comparison with the feature vectors included in each of the reference templates as stored in the memory portion of the microprocessor or microcomputer. Comparison of the sequence of feature vectors as determined from the input analog speech signal with the feature vectors included in the plurality of reference templates produces a cumulative cost profile for enabling logic circuitry within the microprocessor or microcomputer to make a decision as to the identity of the spoken word. The work recognition system may be incorporated within an electronic device which is also equipped with speech synthesis capability such that the electronic device is able to recognize simple words as spoken thereto and to provide an audible comment via speech synthesis which is related to the spoken word.

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Tsukuba Ibaraki, Japan

Toshiaki Yoshino