Patent
Stereophonic signal phase detector - has two amplifier and integrating channels which provide power to LED display for in-phase and in-opposition conditions
TLDR
In this paper, the phase detection method is used for stereophonic signals. The detector provides an output indicating in phase or in opposition conditions for complex signals, i.e. signals having a wide range of frequency and amplitude components.Abstract:
The phase detection method is esp. for stereophonic signals. The detector provides an output indicating in phase or in opposition conditions for complex signals, i.e. signals having a wide range of frequency and amplitude components. The two input channels (C1, C2) are coupled into the circuit by a pair of transformers each having twin secondaries (21, 22, 31, 32) one transformer only having a connection sense reversal switch (1). The secondaries feed two operational amplifiers and integration chains (4-7). One amplifier acts as an addition circuit and the second a subtraction, their outputs being integrated in an RC circuit which includes a detection diode (61, 71). Teh interated outputs are compared in a further resistive feedback operational amplifier (80) with a back to back diode (86) pair input circuit. The comparator output directly feeds an LED pair (90, 91) indicating IN or OPPOSITION phase conditions.read more
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PatentDOI
Music/voice discriminating apparatus
TL;DR: In this article, a music/voice discriminating apparatus is composed of a signal processing portion for effecting the signal processing upon input acoustic signals, a music deciding portion for discriminating whether the inputs are music or voice, and a second signal processing part for controlling the acoustic parameters of the first signal processing component in accordance with the decision results of the music deciding part so that it may become a desirable value set in the second parameter setting portion.
Patent
Method and apparatus for determining phase correlation of a stereophonic signal
Naojiro Tanaka,Masakatu Mizukami +1 more
TL;DR: In this paper, a method and apparatus used for determining phasing correlation between left-channel and right-channel signals of a stereophonic audio signal is provided, and the determination of the phase correlation is facilitated by deriving centrally localized components contained in the audio signal to provide an indication representative of phase correlation existing between the left channel and right channel signals.
Patent
Stereo/monaural detection apparatus
TL;DR: In this article, the level difference between two-channel input audio signals is calculated, and after the signal representing this level difference is discriminated with a predetermined hysteresis maintained, a stereo/monaural detection is performed in accordance with the result of such discrimination, thereby preventing an erroneous detection that may otherwise be caused by any level difference variation during a short time.
PatentDOI
Stereo indicating circuit
TL;DR: In this article, a Schmitt trigger is used to drive an LED display whenever the output from the exclusive OR gate exceeds a preset threshold level to provide an indication that a stereo signal is being reproduced.
Patent
Stereo monaural detection apparatus with differential and add components detection
TL;DR: In this paper, the level difference between two-channel input audio signals is calculated, and after the signal representing this level difference is discriminated with a predetermined hysteresis maintained, a stereo/monaural detection is performed in accordance with the result of such discrimination, thereby preventing an erroneous detection that may otherwise be caused by any level difference variation during a short time.