Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Lorgnette type
Patent
1987-02-26
1989-01-10
Isen, Forester W.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Lorgnette type
364484, 324 77E, 324 77G, H04R 2900
Patent
active
047979313
ABSTRACT:
An audio frequency signal identification apparatus of the present invention has a correlator for obtaining the full band power component and autocorrelation coefficients of a digital audio frequency signal to be identified for each analysis time, a plurality of band pass filters for dividing and filtering the audio frequency signal into a plurality of bands, a plurality of integrators for full wave rectifying and integrating the outputs from the plurality of band pass filters for each analysis time so as to obtain individual power components for the respective bands, a first identification parameter calculator for calculating a maximum power component, a minimum power component, a frequency band yielding the maximum power component, a bandwidth, and a difference between the individual band power components in the respective analysis times, from the individual band power components as the outputs from the plurality of integrators, a second identification parameter calculator for calculating a difference between the autocorrelation coefficients as the output of the correlator and a difference between the autocorrelation coefficients in the respective analysis times, an identification and judgement processor for judging the signal type of the audio frequency signal to be identified in accordance with which of a plurality of predetermined judgement conditions the identification parameters obtained from the first and second identification parameter calculator and the full band power component correspond and if they satisfy a condition of continuity.
REFERENCES:
patent: 3416081 (1968-12-01), Gutleber
patent: 4045620 (1977-08-01), Westbrook
patent: 4510601 (1985-04-01), Delpit et al.
patent: 4528664 (1985-07-01), Cheng et al.
patent: 4599567 (1986-07-01), Goupillaud et al.
patent: 4640134 (1987-02-01), Simmons
patent: 4667065 (1987-05-01), Bangerter
Fukui Akira
Furukawa Yasuo
Hosaka Takemi
Yamazaki Katsuyuki
Isen Forester W.
Kokusai Denshin Denwa Co. Ltd.
NEC Corporation
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