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| Pitch extraction apparatus for an acoustic signal waveform |
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| Telephone line interface circuit |
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| Automatic power control circuit for controlling transmitting power of modulated radio frequency signal |
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Sound reproduction system
| Details |
Inventors: Skabla, Joseph;
Assignee:
Primary Examiner: Popek; Joseph A.
Assistant Examiner:
Attorney, Agent or Firm: Gravely, Lieder & Woodruff
A system for converting an audio signal into a three dimensional phased sound that simulates the performance of live music in an acoustically superior music hall includes a signal divider which separates the audio signal into dimensions, that is into high, low, and intermediate frequency components. Each component after being amplified powers a separate loud speaker so that the sound emitted by the three speakers is in phase with the audio signal. In addition, each component is directed through a delay device where it is delayed on the order of 20-300 milliseconds, with the delay for each of the three components being different. The delayed signal components, after being amplified, power separate loud speakers so that the sound which emerges from these speakers is the same as the sound produced at the other speakers, but is slightly out of phase. Moreover, the magnitude of the delay varies between the high, low, and intermediate frequency ranges with the delay being greatest for the high frequency range. The overall effect is to prolong the initial in phase sound and thereby significantly enhance the brilliance and richness of the reproduced music. Indeed, the reproduced sound closely simulates the acoustics of a fine music hall. |
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DETAILED DESCRIPTION The sound system A of this invention is particularly adapted for reproducing music, irrespective of whether it is recorded or live, and like practically all sound reproduction systems, converts an audio signal S carrying many frequencies into audible sound.
The signal S may be derived from any of a number of sources, but irrespective of its source, the signal S is divided to separate its low, intermediate, and high frequency components.
Each of these components, after being amplified, is converted to primary audible sounds through a suitable speaker, with this conversion occuring instantaneously so that the primary sounds are in phase with the signal S.
In addition, each of the components of the signal S passes through a delay device where the component is delayed in time and thereby placed out of phase with audio signal S.
The delays for the various components differ.
The delayed components are then converted into secondary audible sounds, which are the same as the primary sounds, except that they are slightly out-of-phase with the primary sounds and may be of lesser intensity.
Moreover, the delay is so short that the secondary sounds are not discernible as such.
Nevertheless, they provide the reproduced music with a brilliance and richness that is not available even with the most sophisticated recording and playback equipment.
Indeed, the overall effect simulates the acoustics of a fine music hall.
The audio signal S that is converted into audible sound by the system A is electrical in nature and carries a multitude of frequencies corresponding the frequencies in the music that is to be reproduced.
The audio signal S is derived from a source 2 which may be any of a wide variety of equipment currently available for producing such signals.
For example, the source 2 may be a machine for playing disk-type records.
In this instance, the signal S is generated at a stylus which follows the groove of a record disk, and through the piezoelectric effect converts undulations in that groove into an electrical signal S
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Audio Signal Processing 
