Title:
DIGITAL CODE TRANSMISSION SYSTEM IN AM RADIO SET
Document Type and Number:
Japanese Patent JPH01168132
Kind Code:
A
Abstract:
PURPOSE:To improve the reliability of information, sound quality and articulation by compensating the interference component in the event of AM transmission and PM code transmission in a stage of a code signal in advance. CONSTITUTION:PM code modulation is added in addition to AM modulation, and the modulation signal 105 of a main channel enters an interference correction section 6, and a correction processing signal 111 is sent to a code signal generating section 9 from the section 6 at a level corresponding to a trough region of the AM modulated wave by taking account of the interference in case of the PM code modulation. Then a code signal generating section 9 implants a code signal in the error possible region or emphasizes redundancy to apply the processing not generating a bit error in the reception period of the correction processing signal 111. Thus, the reliability of information is improved and the sound quality and articulation are enhanced.
Inventors:
WAKAI KAZUAKI
ARIKAWA HIROSHI
MORIBE NOBUYOSHI
ISHII MAKOTO
ONO ISAO
IKEDA HIROAKI
ARIKAWA HIROSHI
MORIBE NOBUYOSHI
ISHII MAKOTO
ONO ISAO
IKEDA HIROAKI
Application Number:
JP32782787A
Publication Date:
July 03, 1989
Filing Date:
December 24, 1987
Export Citation:
Assignee:
JAPAN BROADCASTING CORP
International Classes:
H04J9/00; H04B1/10; (IPC1-7): H04B1/10; H04J9/00
Attorney, Agent or Firm:
Yokoo Yoshio