Abstract An audible tone identifier comprises a transducer and amplifier for responding to audible tones, such as generated by a human voice speaking or singing, or a musical instrument, and a plurality of filters sharply tuned to the notes of one or more octaves or fractions thereof of the equal tempered chromatic musical scale or to other patterns of sounds that are to be individually identified. The outputs of the filters are connected to lamp driver circuits which in turn are connected through transposing plug-and-jack connectors and sharp-and-flat insertion switches to lamps on a display board, whereby any musical tone within the range of the device, received by the transducer, will be identified visually on the display board by the lighting of a lamp. The tone identifier may be a component of a teaching or speech therapy system including a source of recorded instructions and sounds to be produced by a trainee, such as a tape player and pre-recorded tape, and headphones through which the trainee hears instructions as well as the sounds produced by him. The relative conformity of tone frequencies with the center frequency of the filters is indicated by comparing the phase of said waves at the input and output of the filters.
Inventors
👤 Thomas D Humphrey
👤 John H Humphrey
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-07 16:10
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A device for identifying sound waves having different frequencies which comprises: sound wave responsive means; means comprising filters for separating waves of different frequencies appearing at the output of the sound wave responsive means; means activated by said wave separating means for individually and visually identifying the sound waves; and means for indicating relative conformity of said waves with the center frequency of the filters by comparing the phase of said waves at the input and output of said filters.
Claim 2
Independent Claim
80 words
A device for identifying sound waves having different frequencies which comprises: sound wave responsive means; means comprising filters for separating waves of different frequencies appearing at the output of the sound wave responsive means; means activated by said wave separating means for individually and visually identifying the sound waves; and means for indicating relative conformity of said waves with the center frequency of the filters by comparing the phase of said waves at the input and output of said filters.
Claim 3
Dependent Claim
16 words
A device in accordance with claim 1 wherein the phase comparing means comprising digital logic components.
Claim 4
Dependent Claim
64 words
A device in accordance with claim 1 wherein the phase comparing means comprises: means for producing a square wave derived from the input of the filter and a square wave derived from the output of the filter; an exclusive OR gate for combining the two square waves to produce a single output wave; and means for interpreting the output wave of the OR gate.