Method of operating a single loud speaker drive system
First Claim
1. A method of operating a single speaker driver circuit for use in association with a source of audio signals and a single coil driven speaker for communicating said signals to said speaker and for reducing unwanted noise in said speaker, said driver circuit having, a low frequency input coil connected between the output of said audio circuit and the input of said single speaker, a low frequency return coil, connected between the return of said single speaker and the return of the audio signal, said low frequency return coil being bifilar wound with said low frequency input coil, whereby signals passing through said low frequency input coil, and through said speaker coil and then through said low frequency return coil will substantially reduce unwanted noise in said speaker, a higher frequency input coil connected between said output of said audio circuit and a location between the return of the speaker and the input to the low frequency return coil, and, a secondary coil connected between the input of said speaker, and said return of said audio signal, said higher frequency input coil and said secondary coil being bifilar wound with one another, and said secondary coil acting as the secondary of a transformer, and being adapted to be excited by higher frequency signals passing through said higher frequency input coil to induce secondary signals which are passed to said speaker input, and comprising the steps of:
- passing said low frequency signals through said low frequency input coil;
passing said high frequency signals through said high frequency input coil, and thereby inducing secondary signals in said secondary coil;
combining said low frequency signals and said secondary signals and passing them through said speaker coil, and,passing said signals from said speaker coil through said low frequency coil bifilar wound with said input coil thereby suppressing unwanted noise signals in said low and high frequency signals.
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Accused Products
Abstract
A method of operating a single speaker driver circuit having, a low frequency input coil connected between an audio circuit output and the input of the speaker, a low frequency return coil, connected between the return of the speaker and the return of the audio signal, the low frequency return coil being bifilar wound with the low frequency input coil, and a higher frequency input coil connected between the audio circuit output and the return of the audio circuit, and a secondary coil connected between the input of the speaker, and ground, the higher frequency input coil and the secondary coil being bifilar wound with one another and acting as the primary and the secondary of a transformer so the higher frequency signals passing through the higher frequency input coil induce secondary signals in the secondary coil, and a method of operating an audio frequency reproduction system using such a driver circuit.
56 Citations
9 Claims
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1. A method of operating a single speaker driver circuit for use in association with a source of audio signals and a single coil driven speaker for communicating said signals to said speaker and for reducing unwanted noise in said speaker, said driver circuit having, a low frequency input coil connected between the output of said audio circuit and the input of said single speaker, a low frequency return coil, connected between the return of said single speaker and the return of the audio signal, said low frequency return coil being bifilar wound with said low frequency input coil, whereby signals passing through said low frequency input coil, and through said speaker coil and then through said low frequency return coil will substantially reduce unwanted noise in said speaker, a higher frequency input coil connected between said output of said audio circuit and a location between the return of the speaker and the input to the low frequency return coil, and, a secondary coil connected between the input of said speaker, and said return of said audio signal, said higher frequency input coil and said secondary coil being bifilar wound with one another, and said secondary coil acting as the secondary of a transformer, and being adapted to be excited by higher frequency signals passing through said higher frequency input coil to induce secondary signals which are passed to said speaker input, and comprising the steps of:
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passing said low frequency signals through said low frequency input coil; passing said high frequency signals through said high frequency input coil, and thereby inducing secondary signals in said secondary coil; combining said low frequency signals and said secondary signals and passing them through said speaker coil, and, passing said signals from said speaker coil through said low frequency coil bifilar wound with said input coil thereby suppressing unwanted noise signals in said low and high frequency signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a single speaker driver circuit for use in association with a source of audio signals and a single coil driven speaker for communicating said signals to said speaker and for reducing unwanted noise in said speaker, and single speaker driver circuit having, a low frequency input coil connected between the output of said audio circuit and the input of said single speaker, a low frequency return coil, connected between the return of said single speaker and the return of the audio signal, said low frequency return coil being bifilar wound with said low frequency input coil, whereby signals passing through said low frequency input coil, and through said speaker coil and then through said low frequency return coil will substantially reduce unwanted noise in said speaker, each of said input and return coils having input ends and return ends and wherein said input ends in said pair are placed together and wherein said return ends of each of said coils in said pair are placed together, so that the currents flow through said input and return coils from their respective input ends to their respective return ends in the same direction, a higher frequency input coil connected between said output of said audio circuit and a location between the return of the speaker and the input to the low frequency return coil, and, a secondary coil connected between the input of said speaker, and ground, said higher frequency input coil and said secondary coil being bifilar wound with one another with said coils acting as the primary and secondary of a transformer, and comprising the steps of:
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passing said low frequency signals through said low frequency input coil and then through said speaker coil and then through said return coil; passing said higher frequency signals through said higher frequency coil, said secondary coil being excited by said higher frequency signals passing through said higher frequency input coil to induce secondary signals which are passed to said speaker input, each of said coils having input ends and return ends, and wherein in said second pair of bifilar coils, said input ends of each coil in said pair are placed together and said return ends of each of the coils in said pair are placed together, so that the currents flow through said higher frequency coil and said secondary coil in said second pair of coils from their respective input to their respective return ends in the same direction. - View Dependent Claims (8)
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9. A method of operating an audio sound reproduction system said system having, a source of audio signal, a single coil driven speaker, a speaker drive circuit for communicating said signals to said speaker and for reducing unwanted noise in said speaker, and having, a low frequency input coil connected between the output of said audio circuit and the input of said single speaker, a low frequency return coil, connected between the return of said single speaker and the return of the audio signal, said low frequency return coil being bifilar wound with said low frequency input coil, whereby signals passing through said low frequency input coil, and through said speaker coil and then through said low frequency return coil will substantially reduce unwanted noise in said speaker, a higher frequency input coil connected between said output of said audio circuit and a location between the return of the speaker and the input to the low frequency return coil, and, a secondary coil connected between the input of said speaker, and said return of said audio signals, said higher frequency input coil and said secondary coil being bifilar wound with one another and functioning as the primary and secondary of a transformer respectively, and comprising the steps of:
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passing said low frequency signals through said low frequency input coil and then through said speaker coil and then through said return coil; passing said higher frequency signals through said higher frequency coil said secondary coil acting as the secondary of a transformer, and being excited by higher frequency signals passing through said higher frequency input coil to induce secondary signals which are passed to said speaker input.
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Specification