EP0440473A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ringing circuit and method for use in a portable telephone set
Assignee: NEC Corp
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Filing: 1991-01-31
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Granted: —
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Expires: 2011-01-31
Abstract
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 of the portable telephone set for producing a first ringing signal when the portable telephone set is in the portable mode, an external loudspeaker 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 loudspeakers 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.
Inventors
- 👤 Nobuhisa Shinozaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:24
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04; H04M1/00; H04M1/60; H04M1/6033; H04M1/6041; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
138 words
A portable telephone set comprising: mode detecting means for detecting the use mode of said portable telephone set to produce portable-mode and mobile-mode signals when said telephone set is in portable and mobile modes, respectively; an internal loudspeaker housed in said portable telephone set; an external loudspeaker having a frequency characteristic different from that of said internal loudspeaker and adapted to be connected to a first connector provided on said telephone set when said portable telephone set is in the mobile mode; and ringing signal generator means for generating a first ringing signal having a frequency spectrum corresponding to said frequency characteristic of said internal loudspeaker in response to said portable-mode signal and for generating a second ringing signal having a frequency spectrum corresponding to said frequency characteristic of said external loudspeaker in response to said mobile-mode signal.
Claim 2
Dependent Claim
44 words
A portable telephone set as claimed in claim 1, further comprising means for detecting a calling signal addressed to said telephone set to produce a calling signal detection signal; and means responsive to said calling detection signal for activating said ringing signal generator means.
Claim 3
Dependent Claim
67 words
A portable telephone set as claimed in claim 2, wherein said ringing signal generator means comprises: a first ringing signal generating circuit for generating said first ringing signal in response to said portable-mode signal and to said calling signal detection signal; and a second ringing signal generating circuit for generating said second ringing signal in response to said portable-mode signal and to said calling signal detection signal.
Claim 4
Dependent Claim
125 words
A portable telephone set as claimed in claim 1, wherein said rinsing signal generator means comprises: a clock generator for generating a clock signal; a frequency divider for frequency dividing said clock signal by a first ratio in response to said portable-mode signal and by a second ratio in response to said mobile-mode signal to produce first and second divided signals, respectively; a counter for counting said first and second divided signals to produce first and second addresses, respectively; a ROM for providing first and second pattern signals in response to said first and second addresses, respectively; and an A/D converter for respectively converting said first and second pattern signals into first and second analog signals corresponding respectively to said first and second ringing signals.
Claim 5
Dependent Claim
36 words
A portable telephone set as claimed in claim 1, wherein said mode detecting circuit comprises a second connector provided on said telephone set and means for providing said mobile-mode signal when said second connector is grounded.
Claim 6
Dependent Claim
25 words
A portable telephone set as claimed in claim 5, wherein said second connector is grounded when said external loudspeaker is connected to said first connector.
Claim 7
Dependent Claim
165 words
A telephone set comprising: means for receiving a radio frequency signal to produce a received signal; means for detecting a calling signal out of said received signal to produce a calling signal detection signal; mode detect means for detecting the use mode of said telephone set to produce a portable-mode signal when said telephone set is used as a portable set and to produce a mobile-mode signal when said telephone set is mounted on a vehicle; first and second speaker means having first and second frequency characteristics, respectively; first generator means responsive to said calling signal detection signal and to said portable-mode signal for generating a first ringing tone suitable to said first frequency characteristic and supplying said first ringing tone to said first speaker means; and second generator means responsive to said calling signal detection signal and to said mobile-mode signal for generating a second ringing tone suitable to said second frequency characteristic and supplying said second ringing tone to said second speaker means.
Claim 8
Dependent Claim
42 words
A telephone set as claimed in claim 7, wherein said first speaker means comprises a first loudspeaker built in a housing of said telephone set, and wherein said second speaker means comprises a second loudspeaker to be coupled to said telephone set.
Claim 9
Dependent Claim
19 words
A telephone set as claimed in claim 7, wherein said first and second frequency characteristics differ from each other.
Claim 10
Dependent Claim
37 words
A telephone set as claimed in claim 9, wherein said first frequency characteristic has a peak output level at about 2.9 kHz, and wherein said second frequency characteristic has a peak output level at about 1.3 kHz.
Claim 11
Dependent Claim
65 words
A telephone set as claimed in claim 7, wherein each of said first and second generator means comprises: an AND gate having two input terminals to be supplied with said calling signal detection signal and the output of said mode detect means, respectively; a tone generator; and power source means responsive to the output of said AND gate for applying power to said tone generator.
Claim 12
Dependent Claim
92 words
A telephone set as claimed in claim 7, wherein said mode detect means comprises: a terminal to be connected to ground when said telephone set is mounted on a vehicle; a pull-up resistor connected between said terminal and a positive potential; a first inverter whose input is connected to said terminal; a second inverter whose input and output are connected to said terminal and said second generator means, respectively; and a third inverter whose input and output are connected to the output of said first inverter and said first generator means, respectively.
Claim 13
Dependent Claim
34 words
A telephone set as claimed in claim 7, further comprising means to be connected between said second generator means and said second speaker means for combining said second ringing tone and a voice signal.
Claim 14
Dependent Claim
126 words
A telephone set comprising: means for detecting a calling signal meant for said telephone set to produce a calling detection signal; means for detecting the use condition of said telephone set and producing first and second mode signals when said telephone set is in first and second conditions, respectively; generator means for generating a first ringing signal in response to said calling detection signal and to said first mode signal and generating a second ringing signal in response to said calling detection signal and to said second mode signal; and switch means for providing said first ringing signal to a first loudspeaker in response to said first mode signal and providing said second ringing signal to a second loudspeaker in response to said second mode signal.
Claim 15
Dependent Claim
51 words
A telephone set as claimed in claim 14, further comprising means connected between said generator means and said switch means for combining said second ringing signal and a voice signal in response to said second mode signal and passing therethrough said first ringing signal in response to said first mode signal.
Claim 16
Dependent Claim
120 words
A telephone set as claimed in claim 14, wherein said generator means comprises: a clock generator for generating a clock signal; a frequency divider for frequency dividing said clock signal based on said first and second mode signal to produce first and second divided signals, respectively; means for storing first and second patterns respectively corresponding to the frequency characteristics of said first and second loudspeakers, and producing the stored first and second patterns in response to said first and second mode signals, respectively; and means for converting the produced first and second patterns into first and second converted signals, respectively, and providing said first and second converted signals to said switch means as said first and second ringing signals, respectively.
Claim 17
Dependent Claim
79 words
A telephone set comprising: an internal loudspeaker; a first terminal to be connected to an external speaker; mode detect means for detecting the use mode of said telephone set to produce portable-mode and mobile-mode signals when said telephone set is in portable and mobile modes, respectively; and generator means responsive to said portable-mode and mobile-mode signals for generating first and second ringing signals, respectively, and providing said first and second ringing signals to said internal and external loudspeaker, respectively.
Claim 18
Dependent Claim
32 words
A telephone set as claimed in claim 17, further comprising means for detecting a calling signal addressed to said telephone set to produce a calling detection signal which enables said generator means.
Claim 19
Dependent Claim
62 words
A telephone set as claimed in claim 17, further comprising a second terminal to be connected to ground when said telephone set is in said mobile mode, and wherein said mode detect means comprises: means for generating said portable-mode signal when said second terminal is not connected to ground and generating said mobile-mode signal when said second terminal is connected to ground.
Claim 20
Dependent Claim
157 words
A telephone set comprising: means for receiving a calling signal to produce a calling detection signal; means responsive to said calling detection signal for transmitting a response signal; means for receiving a channel designate signal designating a specific speech channel to produce a channel designate detection signal; means responsive to said channel designate detection signal for tuning said telephone set to said specific speech channel; means for detecting whether said telephone set in a portable or mobile mode; means for generating a portable-mode ringing signal when said telephone set is in said portable mode, the frequency of said portable-mode ringing signal being suitable to an internal loudspeaker built in said telephone set; means for generating a mobile-mode ringing signal when said telephone set is in said mobile-mode, the frequency of said mobile-mode ringing signal being suitable to an external loudspeaker; and means for providing said portable-mode and mobile-mode ringing signals to said internal and external loudspeakers, respectively.
Claim 21
Dependent Claim
49 words
A telephone set as claimed in claim 20, further comprising: means for detecting an off-hook state of said telephone set to produce an off-hook detection signal; and means responsive to said off-hook detection signal for performing a connection process so that said telephone set is available for a conversation.
Claim 22
Independent Claim
144 words
A method of supplying a ringing signal to an internal loudspeaker built in a telephone set and to an external loudspeaker to be connected to said telephone set, comprising the steps of: detecting a calling signal addressed to said telephone set to produce a calling detection signal; detecting the use mode of said telephone set to produce portable-mode and mobile-mode signals when said telephone set is in portable and mobile modes, respectively; responsive to said portable-mode and mobile-mode signals, generating portable-mode and mobile-mode ringing signals, respectively, the frequencies of said portable-and mobile-mode ringing signals being suitable to said internal and external loudspeakers, respectively; responsive to said calling detection signal and to said portable-mode signal, supplying said portable-mode ringing signal to said internal loudspeaker; and responsive to said calling detection signal and to said mobile-mode signal, supplying said mobile-mode ringing signal to said external loudspeaker.
Claim 23
Dependent Claim
37 words
A method as claimed in claim 22, further comprising the step of, responsive to said calling detection signal and to said mobile-mode signal, supplying both said mobile-mode ringing signal and a voice signal to said external loudspeaker.
References Cited (Backward Citations)
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