公开(公告)号：JPS5345904A

公开(公告)日：1978-04-25

申请号：JP12030076

申请日：1976-10-08

Applicant: SONY CORP

Inventor： SHIMIZU IKUO ,  KOMATSUBARA MICHIMASA ,  TAKAHASHI KAZUMASA ,  SHIYOUDA AKIHIKO ,  SANTOU FUMIO

IPC: H04H1/00 ,  H04H20/48 ,  H04H5/00

Abstract: PURPOSE:Stereophonic signals are transmitted simultaneously by two FM monaural signals, so that stereophonic signals can be reproduced with a good SN ratio and separation even in case of a weak field intensity.

公开(公告)号：JPS539402A

公开(公告)日：1978-01-27

申请号：JP8289576

申请日：1976-07-14

Applicant: SONY CORP

Inventor： SHIMIZU IKUO ,  KOMATSUBARA MICHIMASA ,  SANTOU FUMIO

IPC: H04B1/26 ,  H04B1/16 ,  H04H1/00 ,  H04H40/45

Abstract: PURPOSE:To prevent the lowering is S/N ratio and to make large the separation of the signal of left and right channel, by obtaining the specified two intermediate trequency signal thru the use of two local oscillating circuits and mixing circuit.

公开(公告)号：JPS53105107A

公开(公告)日：1978-09-13

申请号：JP1959077

申请日：1977-02-24

Applicant: SONY CORP

Inventor： SHIMIZU IKUO ,  KOMATSUBARA MICHIMASA ,  SANTOU FUMIO

IPC: H04B1/26

Abstract: PURPOSE:To enable the multichannel broadcasting to be received simultaneously by providing a branching circuit after the frequency conversion stage.