Waveform generating apparatus, waveform generating method, and decoder
AssigneeSony Corporation
InventorsChisato Kemmochi, Akira Inoue, Masayuki Nishiguchi
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Abstract
Amplitude, phase and frequency of a sine wave to be generated are calculated on the basis of feature quantity s1 delivered to feature quantity detecting means (2), and are sent to initialization means (3). The initialization means (3) calculates first two points of the sine wave to send the points thus calculated to oscillator (sine wave generating means) (4) as initial value s4. The oscillator (4) sequentially calculates values of respective sample points of waveform by using recurrence formula in accordance with initial value or values instructed from the initialization means (3) to thereby generate a sine wave signal. Thus, sine wave generation is performed without performing modulo-addressing.
Claims17
A waveform generating apparatus adapted for generating a periodical waveform on the basis of an inputted feature quantity,
- the waveform generating apparatus including:
- detecting means for detecting the inputted feature quantity;
- oscillating means for computing at least two values of the periodical waveform at sample points on the basis of the feature quantity detected by the detecting means, and assigning the at least two values as initial values to terms of a trinomial recurrence formula to thereby generate the periodical waveform based on the trinomial recurrence formula;
- and
- output means for outputting the periodical waveform generated from the oscillating means.
A waveform generation method of generating a periodical waveform on the basis of an inputted feature quantity, the waveform generation method including:
- a detection step of detecting the inputted feature quantity;
- a waveform generation step of computing at least two values of the periodical waveform at sample points on the basis of the feature quantity detected by the detecting means, and assigning the at least two values as initial values to terms of a trinomial recurrence formula to thereby generate the periodical waveform based on the trinomial recurrence formula;
- and an output step of outputting the periodical waveform generated by the waveform generation step.
A decoder supplied with encoded data including feature quantity obtained by performing sine wave analysis of a time series signal every encoding frame, the decoder including a waveform synthesis unit comprising:
- separating means for separating feature quantity in the encoded data;
- detecting means for detecting the separated feature quantity;
- oscillating means for computing at least two values of periodical waveform at sample points on the basis of the feature quantity detected by the detecting means, and assigning the at least two values as initial values to terms of a trinomial recurrence formula to generate a periodical waveform based on the trinomial recurrence formula;
- and output means for outputting the periodical waveform generated from the oscillating means.
Dependencies are inferred from the claim text.