Telephone apparatus, telephone switchboard, and telephone line connection method

• US 20070041510A1
• Filed: 05/19/2006
• Published: 02/22/2007
• Est. Priority Date: 05/20/2005
• Status: Abandoned Application

• Current Assignee: NEC Infrontia Corporation (NEC Corporation)
• Original Assignee: NEC Infrontia Corporation (NEC Corporation)
• Inventors: Sawakuri, Hiroshi
• Application Number:
  US11/436,658
• Publication Number:
  US 20070041510A1
• Time in Patent Office: Days
• US Class Current: 379/27.10
• CPC Class Codes: H04M 1/6016 in the receiver circuit
• CPC Class Codes: H04M 19/005 Feeding arrangements without the use of line transformers

Abstract

The telephone apparatus prevents a ringer sound from being produced from a handset after the handset is off-hook by an incoming call while using a conventional subscriber line of a central telephone exchange. A telephone apparatus includes a ringer signal detection unit that detects a ringer signal, and a disconnection unit that disconnects a loudspeaker from a line while the ringer signal detection unit detects the ringer signal.

Claims

1. A telephone apparatus comprising:

ringer signal detection means for detecting a ringer signal; and

disconnection means for disconnecting a loudspeaker from a line while the ringer signal detection means detects the ringer signal.

2. The telephone apparatus according to claim 1, wherein

the ringer signal detection means outputs a direct-current signal while the ringer signal has an alternating-current amplitude.

3. A telephone line connection method comprising:

a ringer signal detection step of detecting a ringer signal; and

a disconnection step of disconnecting a loudspeaker from a line while the ringer signal is detected at the ringer signal detection step.

4. The telephone line connection method according to claim 3, wherein

at the ringer signal detection step, a direct-current signal is output while the ringer signal has an alternating-current amplitude.

5. A telephone switchboard comprising:

ringer signal detection means for detecting a ringer signal; and

disconnection means for disconnecting a conversation unit of a station line interface unit from a conversation unit of an extension interface unit while the ringer signal detection means detects the ringer signal.

6. The telephone switchboard according to claim 5, wherein

the ringer signal detection means outputs a direct-current signal while the ringer signal has an alternating-current amplitude.

7. A telephone line connection method, comprising:

a ringer signal detection step of detecting a ringer signal; and

a disconnection step of disconnecting a conversation unit of a station line interface unit from a conversation unit of an extension interface unit while the ringer signal is detected at the ringer signal detection step.

8. The telephone line connection method according to claim 7, wherein

at the ringer signal detection step, a direct-current signal is output while the ringer signal has an alternating-current amplitude.