Wireless telephone equipment operating as a cordless and cellular telephone

• US 6,085,109 A
• Filed: 04/20/1993
• Issued: 07/04/2000
• Est. Priority Date: 04/30/1992
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Koga, Toshihiro
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US08/048,188
• Time in Patent Office: 2,632 Days
• Field of Search: 379/58, 379/59, 379/61, 455/76, 455/77, 455/103, 455/120, 455/126, 455/260, 455/314, 455/315, 455/422, 455/432, 455/426, 455/436, 455/550, 455/552, 455/553, 455/575, 455/90, 455/102, 455/180.1 , 455/188.1, 455/189.1, 455/337, 455/340
• US Class Current: 455/552.1
• CPC Class Codes: H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A wireless telephone equipment is provided with a microphone for receiving voice of a user and changing the voice to audio signals of an outgoing call, a cellular transmitter for modulating a carrier with the audio signals in a cellular communication, a cellular band-pass filter for filtering the carrier modulated in the cellular transmitter, a cordless transmitter for modulating a carrier with the audio signals in a cordless communication, a cordless band-pass filter for filtering the carrier modulated in the cordless transmitter, an antenna for transmitting the carrier filtered in the cellular or cordless band-pass filter and receiving a modulated signal, a band-pass filter for filtering the modulated signal, a cellular-cordless receiver for demodulating the modulated signal filtered to reproduce audio signals of an incoming call in the cellular communication and cordless communication, and a speaker for receiving the audio signals of the incoming call and giving voice. In cases where the equipment is positioned within call range of a cordless base station, the cordless communication is performed.

Claims

1. A wireless telephone equipment comprising:

signal generation means for generating a first information signal of an outgoing call;

first transmitting means for modulating a first carrier with the first information signal generated by the signal generation means to produce a first modulated signal, wherein a frequency of the first carrier is in a first frequency band corresponding to a cellular frequency band;

second transmitting means for modulating a second carrier with the first information signal generated by the signal generation means to produce a second modulated signal, wherein a frequency of the second carrier is in a second frequency band corresponding to a cordless frequency band that is different from the first frequency band of the first carrier;

antenna means for transmitting either the first modulated signal produced in the first transmitting means or the second modulated signal produced in the second transmitting means and receiving a third modulated signal in which a third carrier is modulated with a second information signal of an incoming call, wherein a frequency of the third carrier is in a third frequency band corresponding to a combined cellular/cordless frequency band that is different from both the first frequency band of the first carrier and the second frequency band of the second carrier;

a single demodulating circuit for demodulating the third modulated signal received in the antenna means to reproduce the second information signal of the incoming call;

outputting means for outputting the second information signal reproduced in the demodulating circuit; and

control means for controlling the operation of the first transmitting means, the second transmitting means, and the demodulating circuit.

2. An equipment according to claim 1 in which the first transmitting means operates in a cordless telephone communication, the second transmitting means operates in a cellular telephone communication, and the demodulating circuit operates in both the cordless telephone communication and the cellular telephone communication, the cordless telephone communication being performed under control of the control means in cases where the wireless telephone equipment is positioned within call range of a cordless base station, and the cellular telephone communication being performed under control of the control means in cases where the wireless telephone equipment is positioned out of the call range of the cordless base station.

3. An equipment according to claim 1 in which the first frequency band of the first carrier ranges from 824 MHz to 849 MHz, the second frequency band of the second carrier ranges from 926 MHz to 928 MHz, and the third frequency band of the third carrier ranges from 869 MHz to 904 MHz.

4. An equipment according to claim 1 in which the signal generation means is a microphone in which voice of a user is changed to the first information signal, and the output means is a speaker in which the second information signal is changed to voice of a sender.

5. An equipment according to claim 1 in which the first transmitting means comprises a phase locked loop frequency synthesizer for modulating the first carrier with the first information signal to produce the first modulated signal, a band-pass filter for filtering the first information signal to eliminate unnecessary noises which are generated with the first modulated signal in the phase locked loop frequency synthesizer, and a power amplifier for amplifying a power level of the first modulated signal produced in the phase locked loop frequency synthesizer.

6. An equipment according to claim 1 in which the second transmitting means comprises a phase locked loop frequency synthesizer for modulating the first carrier with the first information signal to produce the first modulated signal, a band-pass filter for filtering the first information signal to eliminate unnecessary noises which are generated with the first modulated signal in the phase locked loop frequency synthesizer, a power amplifier for amplifying a power level of the first modulated signal produced in the phase locked loop frequency synthesizer, a directional coupler for taking out a part of travelling-wave component of the modulated signal amplified in the power amplifier, and an automatic power controller for automatically controlling the power level of the modulated signal amplified in the power amplifier under control of the control means according to a power level of the modulated signal taken out in the directional coupler.

7. An equipment according to claim 1 in which the demodulating circuit comprises a first frequency converter for converting the frequency of the third carrier to an first intermediate frequency of a first intermediate-frequency signal, a first intermediate frequency band-pass filter for filtering the first intermediate-frequency signal to eliminate unnecessary noises which are generated with the first intermediate-frequency signal in the first frequency converter, a second frequency converter for converting the frequency of the first intermediate-frequency signal to a second intermediate frequency of a second intermediate-frequency signal, a second intermediate frequency band-pass filter for filtering the second intermediate-frequency signal to eliminate unnecessary noises which are generated with the second intermediate-frequency signal in the second frequency converter, and a demodulator for demodulating the second intermediate-frequency signal to reproduce the second information signal of the incoming call.

8. An equipment according to claim 1, additionally including:

a first transmitting band-pass filter for filtering the first modulated signal produced in the first transmitting means, the first modulated signal in the first frequency band of the first carrier passing through the first transmitting band-pass filter and being transferred to the antenna;

a second transmitting band-pass filter for filtering the second modulated signal produced in the second transmitting means, the second modulated signal in the second frequency band of the second carrier passing through the second transmitting band-pass filter and being transferred to the antenna; and

a receiving band-pass filter for filtering the third modulated signal received in the antenna, the third modulated signal in the third frequency band of the third carrier passing through the receiving band-pass filter and being transferred to the demodulating circuit.

9. An equipment according to claim 1 in which the second information signal of the incoming call demodulated in the demodulating circuit is modulated by a cellular receiving carrier of which frequency is in a cellular receiving frequency band in cases where a cellular telephone communication is performed, and the second information signal of the incoming call demodulated in the demodulating circuit is modulated by a cordless receiving carrier of which frequency is in a cordless receiving frequency band differing from the cellular receiving frequency band in cases where a cordless telephone communication is performed.