Back to results
US 6,655,212 B2Granted
Sound field measuring apparatus and method
AssigneePioneer Corporation
InventorYoshiki Ohta
Life of this patent
Estimating the term…
Abstract
A sound field measuring apparatus has: an exponential pulse generator 11 which outputs a pulse signal to speakers 4a, 4b, . . . ; a microphone 6 which is disposed in an acoustic space 5 where the speakers 4a, 4b, . . . are disposed, and which detects a pulse signal output from each of the speakers 4a, 4b, . . . ; and a calculation section 15 which detects a time when the signal detected by the microphone 6 exceeds a predetermined threshold. The calculation section 15 calculates a time period from a time when the pulse signal is generated by the exponential pulse generator 11 to the time when the signal exceeds the predetermined threshold.
Claims38
A sound field measuring apparatus comprising:
- a pulse signal generating section for outputting a pulse signal to speakers;
- a pulse signal detecting section, disposed in an acoustic space where the speakers are placed, for detecting a pulse signal output from each of the speakers;
- a time detecting section for detecting a time when the signal detected by the pulse signal detecting section exceeds a predetermined threshold;
- and
- a calculating section for calculating a time period from a time when the pulse signal is generated by a pulse signal generating section to a time of detection by the time detecting section,
- wherein the pulse signal has spectral components that uniformly attenuate from a low frequency region to a high frequency region, and
- wherein an energy of the pulse signal is substantially concentrated at a predetermined time.
4 more elements
A sound field measuring apparatus comprising:
- a pulse signal generating section for outputting a pulse signal to speakers;
- a pulse signal detecting section, disposed in an acoustic space where the speakers are placed, for detecting a pulse signal output from each of the speakers;
- a rising emphasizing section for performing a process of emphasizing rising of the signal detected by the pulse signal detecting section;
- a time detecting section for detecting a time when the signal obtained from the rising emphasizing section exceeds a predetermined threshold;
- and
- a calculating section for calculating a time period from a time when the pulse signal is generated by a pulse signal generating section to a time of detection by the time detecting section,
- wherein the pulse signal has spectral components that uniformly attenuate from a low frequency region to a high frequency region, and
- wherein an energy of the pulse signal is substantially concentrated at a predetermined time.
5 more elements
A sound field measuring method comprising:
- generating and outputting a pulse signal to speakers;
- detecting a pulse signal output from each of the speakers in an acoustic space where the speakers are placed;
- detecting a time when the pulse signal detected exceeds a predetermined threshold;
- and
- calculating a time period from a time when the pulse signal is generated to a time of detection,
- wherein the pulse signal has spectral components that uniformly attenuate from a low frequency region to a high frequency region, and
- wherein an energy of the pulse signal is substantially concentrated at a predetermined time.
4 more elements
A sound field measuring method comprising:
- generating and outputting a pulse signal to speakers;
- detecting a pulse signal output from each of the speakers in an acoustic space where the speakers are placed;
- emphasizing rising of the pulse signal detected;
- detecting a time when the signal detected and emphasized exceeds a predetermined threshold;
- and
- calculating a time period from a time when the pulse signal is generated to a time of detection,
- wherein the pulse signal has spectral components that uniformly attenuate from a low frequency region to a high frequency region, and
- wherein an energy of the pulse signal is substantially concentrated at a predetermined time.
5 more elements
A sound field measuring apparatus comprising:
- a pulse signal generating section for outputting a pulse signal to speakers;
- a pulse signal detecting section, disposed in an acoustic space where the speakers are placed, for detecting a pulse signal output from each of the speakers;
- a rising emphasizing section for performing a process of emphasizing rising of the signal detected by the pulse signal detecting section;
- a time detecting section for detecting a time when the signal obtained from the rising emphasizing section exceeds a predetermined threshold;
- and
- a calculating section for calculating a time period from a time when the pulse signal is generated by a pulse signal generating section to a time of detection by the time detecting section,
- wherein the pulse signal output from the pulse signal generating section is a signal in which a power is concentrated into a region that is lower in frequency than an impulse signal, and
- the rising emphasizing section performs a process of substantially flattening a frequency characteristic of the signal input into the time detecting section.
5 more elements
A sound field measuring method comprising:
- generating and outputting a pulse signal to speakers;
- detecting a pulse signal output from each of the speakers in an acoustic space where the speakers are placed;
- emphasizing rising of the pulse signal detected;
- detecting a time when the signal detected and emphasized exceeds a predetermined threshold;
- and
- calculating a time period from a time when the pulse signal is generated to a time of detection,
- wherein the pulse signal output is a signal in which a power is concentrated into a region that is lower in frequency than an impulse signal, and
- the rising emphasizing step performs a process of substantially flattening a frequency characteristic of the signal which is to be processed by the time detecting step.
5 more elements
Dependencies are inferred from the claim text.