WO2000003488A3 - Device for transmitting and receiving audible signals - Google Patents

Device for transmitting and receiving audible signals Download PDF

Info

Publication number
WO2000003488A3
WO2000003488A3 PCT/US1999/015764 US9915764W WO0003488A3 WO 2000003488 A3 WO2000003488 A3 WO 2000003488A3 US 9915764 W US9915764 W US 9915764W WO 0003488 A3 WO0003488 A3 WO 0003488A3
Authority
WO
WIPO (PCT)
Prior art keywords
transmitter
voltage
monitor
infant monitor
infant
Prior art date
Application number
PCT/US1999/015764
Other languages
French (fr)
Other versions
WO2000003488A2 (en
Inventor
Michael K Pedigo
Original Assignee
Safety First Inc
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 Safety First Inc filed Critical Safety First Inc
Priority to AU50977/99A priority Critical patent/AU5097799A/en
Priority to CA002336993A priority patent/CA2336993A1/en
Publication of WO2000003488A2 publication Critical patent/WO2000003488A2/en
Publication of WO2000003488A3 publication Critical patent/WO2000003488A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/401—Circuits for selecting or indicating operating mode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
    • H03B5/362—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device the amplifier being a single transistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/42—Angle modulation by means of electromechanical devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0216—Varying the frequency of the oscillations by electronic means the means being an element with a variable inductance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/025—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Selective Calling Equipment (AREA)

Abstract

A low-cost infant monitor that reliably is obtaining, transmitting, receiving and broadcasting audible signals includes a transmitter and a receiver. Both the transmitter and receiver include a single high motional capacitance crystal selectively connectable one of a plurality of loads to select one of a predetermined number of carrying frequencies for the infant monitor. A transmitter of the infant monitor may include a power regulator having interconnected transistors operably associated to produce an output voltage at least partially independent of the input voltage. In this power regulator, the interconnected transistors each have a base connected to a voltage controlled by the other transistor. A filter may be provided for smoothing the output voltage and a power monitor circuit may be provided to provide a first indication if voltage has been supplied to the infant monitor, and to provide a second indication if the power supplied to the infant monitor is below a threshold voltage. A filter circuit for use in the transmitter can be formed to include a transformer operable to band pass filter the input frequency modulated carrier frequency and to select a harmonic of the input frequency modulated carrier frequency.
PCT/US1999/015764 1998-07-13 1999-07-08 Device for transmitting and receiving audible signals WO2000003488A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU50977/99A AU5097799A (en) 1998-07-13 1999-07-08 Device for obtaining, transmitting, receiving and producing audible signals
CA002336993A CA2336993A1 (en) 1998-07-13 1999-07-08 Device for obtaining, transmitting, receiving and producing audible signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11464298A 1998-07-13 1998-07-13
US09/114,642 1998-07-13

Publications (2)

Publication Number Publication Date
WO2000003488A2 WO2000003488A2 (en) 2000-01-20
WO2000003488A3 true WO2000003488A3 (en) 2001-08-09

Family

ID=22356522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/015764 WO2000003488A2 (en) 1998-07-13 1999-07-08 Device for transmitting and receiving audible signals

Country Status (3)

Country Link
AU (1) AU5097799A (en)
CA (1) CA2336993A1 (en)
WO (1) WO2000003488A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102395064A (en) * 2011-10-12 2012-03-28 刘喆 Miniature frequency-modulation wireless microphone with one battery

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276784A (en) * 1993-03-22 1994-10-05 Motorola Gmbh Shifting spurious frequencies away from received frequency
US5469117A (en) * 1993-04-14 1995-11-21 U.S. Philips Corporation Voltage-controlled frequency oscillator
WO1996030996A1 (en) * 1995-03-24 1996-10-03 Instituut Voor Milieu- En Agritechniek (Imag-Dlo) Circuit for modulating a crystal oscillator with voltage-controlled (pin) diode
US5708970A (en) * 1995-11-13 1998-01-13 Gerry Baby Products Wireless sound monitoring apparatus with subaudible squelch control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276784A (en) * 1993-03-22 1994-10-05 Motorola Gmbh Shifting spurious frequencies away from received frequency
US5469117A (en) * 1993-04-14 1995-11-21 U.S. Philips Corporation Voltage-controlled frequency oscillator
WO1996030996A1 (en) * 1995-03-24 1996-10-03 Instituut Voor Milieu- En Agritechniek (Imag-Dlo) Circuit for modulating a crystal oscillator with voltage-controlled (pin) diode
US5708970A (en) * 1995-11-13 1998-01-13 Gerry Baby Products Wireless sound monitoring apparatus with subaudible squelch control

Also Published As

Publication number Publication date
CA2336993A1 (en) 2000-01-20
AU5097799A (en) 2000-02-01
WO2000003488A2 (en) 2000-01-20

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