CA2140679A1 - Ringing Circuit for Use in Portable Telephone Set - Google Patents

Ringing Circuit for Use in Portable Telephone Set

Info

Publication number
CA2140679A1
CA2140679A1 CA 2140679 CA2140679A CA2140679A1 CA 2140679 A1 CA2140679 A1 CA 2140679A1 CA 2140679 CA2140679 CA 2140679 CA 2140679 A CA2140679 A CA 2140679A CA 2140679 A1 CA2140679 A1 CA 2140679A1
Authority
CA
Canada
Prior art keywords
ringing
mode
telephone set
portable telephone
producing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2140679
Other languages
French (fr)
Other versions
CA2140679C (en
Inventor
Nobuhisa Shinozaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nobuhisa Shinozaki
Nec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nobuhisa Shinozaki, Nec Corporation filed Critical Nobuhisa Shinozaki
Priority claimed from CA002035411A external-priority patent/CA2035411C/en
Publication of CA2140679A1 publication Critical patent/CA2140679A1/en
Application granted granted Critical
Publication of CA2140679C publication Critical patent/CA2140679C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

A portable telephone set having a ringing circuit for producing different ringing tones depending upon the use mode of the portable telephone set, a portable mode or a mobile mode. The ringing circuit comprises a mode detecting circuit for detecting the use mode, an internal loudspeaker housed in a housing or the portable telephone set for producing a first ringing signal when the portable telephone set is in the portable mode, an external loud-speaker connected externally of the housing for producing a second ringing signal when it is in the mobile mode and a ringing tone generator for generating a first and a second ringing tones for driving the respective loud-speakers producing first and second ringings. The first and second ringing tones have frequency spectra compatible with frequency characteristics of these loudspeakers to produce the respective ringings efficiently. The ringing signal generator may be a single ringing tone generating circuit producing two kinds of ringing tone or may be comprised of two different ringing tone generating circuits.
CA002140679A 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set Expired - Fee Related CA2140679C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP21233/1990 1990-01-31
JP2123390 1990-01-31
CA002035411A CA2035411C (en) 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002035411A Division CA2035411C (en) 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set

Publications (2)

Publication Number Publication Date
CA2140679A1 true CA2140679A1 (en) 1991-08-01
CA2140679C CA2140679C (en) 1997-10-14

Family

ID=25674466

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002140680A Expired - Fee Related CA2140680C (en) 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set
CA002140679A Expired - Fee Related CA2140679C (en) 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA002140680A Expired - Fee Related CA2140680C (en) 1990-01-31 1991-01-31 Ringing circuit for use in portable telephone set

Country Status (1)

Country Link
CA (2) CA2140680C (en)

Also Published As

Publication number Publication date
CA2140679C (en) 1997-10-14
CA2140680A1 (en) 1991-08-01
CA2140680C (en) 1997-02-18

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed