Answering machine with cordless telephone

• US 4,881,259 A
• Filed: 01/06/1989
• Issued: 11/14/1989
• Est. Priority Date: 01/06/1989
• Status: Expired due to Term

• Current Assignee: Cobra Electronics Corp. (Cedar Electronics Holdings Corp.)
• Original Assignee: Dynascan Corporation (Cedar Electronics Holdings Corp.)
• Inventors: Scordato, James
• Primary Examiner(s): Lev, Robert
• Application Number:
  US07/294,429
• Time in Patent Office: 312 Days
• Field of Search: 379/56, 379/57, 379/58, 379/61, 379/62, 379/67, 379/88, 379/63, 340/825.44, 340/311.1
• US Class Current: 455/412.2
• CPC Class Codes: H04M 1/65 Recording arrangements for recording a message from the calling party in the exchange H04M3/50
• CPC Class Codes: H04M 1/663 Preventing unauthorised calls to a telephone set
• CPC Class Codes: H04M 1/72415 for remote control of appliances
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724

Abstract

A cordless telephone and an answering machine of the remote-pickup type are provided as an integrated unit having the answering machine and telephone base unit integrated into a common housing. The remote handset contains circuitry for generating a command signal condition at the user'"'"'s option which will operate the base unit to a "screening mode" wherein the activity on the telephone lines during the playback and record period is transmitted to the remote unit, but wherein audio pass-through from the base unit radio receiver is disabled. In the preferred form of the invention the command signal condition is in the form of a pilot tone of a given frequency, receipt of which by the base unit receiver disables audio pass-through. To enter two-way "talk" mode, a pilot tone of different frequency is also sent by the remote unit, loss of this tone being being to cause the base unit to cease transmitting to the remote unit.

Claims

1. In combination with a telephone answering machine having connector means for making connection to telephone lines, said answering machine including recording and playing means operable to a playing mode for sending out onto telephone lines a recorded announcement and to a recording mode for recording incoming messages thereafter, and system control means operable between an active mode establishing communication between said telephone lines and telephone means and a passive mode establishing communication between said telephone lines and said recording and playing means:

telephone means in the form of a cordless telephone means including a base unit and a portable handset each having transmitter and receiver means, said base unit transmitter including means for transmitting to said handset receiver means ringing signals and incoming messages received from said telephone lines, said handset transmitter means having means for transmitting to said telephone lines through said base unit receiver means voice communications from the user and command means for transmitting to said base unit receiver means user-chosen control signal conditions, said system control means including means responsive to receipt of said control signal conditions by said base unit receiver means for operating said system control means between said active and passive modes, and said recording and playing means, said system control means, and said base unit are contained within a common housing.

2. The combination of claim 1 wherein said common housing has an open-top recess into which said handset is stored and charged when not in use.

3. In combination with a telephone answering machine having connector means for making connection to telephone lines, said answering machine including recording and playing means operable to a playing mode for sending out onto telephone lines a recorded announcement and to a recording mode for recording incoming messages thereafter, and system control means operable between an active mode establishing communication between said telephone lines and a telephone means and a passive mode establishing communication between said telephone lines and said recording and playing means:

telephone means in the form of cordless telephone means including a base unit and a portable handset each having transmitter and receiver means, said base unit transmitter means including means for transmitting to said handset receiver means ringing signals and incoming messages received from said telephone lines, said handset transmitter means having means for transmitting to said telephone lines through said base unit receiver means voice communications from the user and command means for transmitting to said base unit receiver means user-chosen normal and screening control signal conditions, said base unit receiver means including means responsive to receipt of said normal control signal condition for operating said system control means from said passive to said active mode, means responsive to receipt of either said normal or said screening control signal conditions for actuating said base unit transmitter means to transmit incoming messages from said telephone lines, and screening means responsive to receipt of said screening control signal condition for preventing placing a signal condition on said telephone lines indicating that the user is listening.

4. The combination of claim 3 wherein said screening means includes means for preventing said base unit receiver means from passing to said telephone lines voice communications received from said handset.

5. The combination of claim 4 wherein said handset includes pilot tone generating means for generating said screening control signal condition as a screening pilot tone modulating the output of said handset transmitter means, and said base unit screening means includes screening pilot tone detection means responsive to receipt of said screening pilot tone from said base unit receiver means for preventing passage of voice audio frequency information from said base unit receiver means to said telephone lines.

6. The combination of claim 5 wherein said handset includes normal tone generating means for generating said screening control signal condition as a normal pilot tone modulating the output of said handset transmitter means, and said base unit receiver means includes normal pilot tone detection means responsive to receipt of said normal pilot tone to operate said base unit transmitter means to transmit to said handset incoming voice communications received from said telephone lines and to operate said system control means from said passive to said active mode.

7. The combination of claim 6 wherein said system control means when in said active mode includes means responsive to the loss of both pilot tones by said base unit receiver means for reverting to said passive mode.

8. The combination of claim 7 wherein said base unit receiver means has associated therewith low-pass filter means for strongly attenuating transmission to said telephone lines of signals above a given cutoff frequency, said frequencies of said screening and non-screening pilot tones are different from each other, and said pilot tone frequencies are above said cutoff frequency.

9. The combination of claims 3, 4, or 6 wherein said handset transmitter means includes means for transmitting an identification code to said base unit receiver means and said system control means includes inhibiting means responsive to receipt of said identification code by said base unit receiver means for preventing transmission of incoming voice messages by said base unit transmitter means until said identification code is received.

10. The combination of claims 3, 4, or 6 wherein said recording and playing means, said system control means, and said base unit are contained within a common housing.

11. The combination of claim 10 wherein said common housing has an open-top recess into which said handset is stored and charged when not in use.