Title:
【発明の名称】ステレオ信号の位相関係判定に使用する方法及び装置
Document Type and Number:
Japanese Patent JP3099892
Kind Code:
B2
Abstract:
Phase correlation between left-channel and right-channel signals of a stereophonic audio signal is determined 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. The apparatus has inputs (1A,2A) for receiving the left-channel and right-channel signals, and a sum/difference circuit (3A) to provide sum and difference outputs (R+L, R-L). Band-pass filters (4A,5A) typically having passbands of 600 Hz +/- 200 Hz, are connected either to the outputs or alternatively to the inputs (Figs. 4B, 4C) of the sum/difference circuit. The sum and difference signals are applied to a CRT X-Y display (6A) on which are produced Lissajous' figures, and/or to an indicator (7A) which can operate in real time or in a hold mode.
Inventors:
Naojiro Tanaka
Masakatsu Mizukami
Masakatsu Mizukami
Application Number:
JP28122190A
Publication Date:
October 16, 2000
Filing Date:
October 19, 1990
Export Citation:
Assignee:
Leader Electronics Co., Ltd.
International Classes:
G01R25/00; G01R31/00; H04H20/12; H04H20/88; H04H60/04; H04S7/00; H04S1/00; H04H1/00; H04H5/00; (IPC1-7): G01R31/00; G01R25/00; H04H7/00; H04S7/00
Domestic Patent References:
| JP5169915A | ||||
| JP62263800A | ||||
| JP63209300A | ||||
| JP55112999U | ||||
| JP6217300U |
Attorney, Agent or Firm:
Jun Tsuda (3 others)