Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
  • H04M1/65—Recording arrangements for recording a message from the calling party
  • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/28—Modifications for introducing a time delay before switching
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
  • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
  • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
  • H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
  • H04M1/65—Recording arrangements for recording a message from the calling party

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Devices For Supply Of Signal Current (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=21792559

Family Applications (2)

Family Applications After (1)

Country Status (6)

Families Citing this family (13)

Family Cites Families (6)

• 0
  • NL NL122369D patent/NL122369C/xx active
  • NL NL260729D patent/NL260729A/xx unknown
• 1960
  • 1960-04-01 US US19314A patent/US3119027A/en not_active Expired - Lifetime
• 1961
  • 1961-02-17 FR FR853122A patent/FR1281078A/fr not_active Expired
  • 1961-03-29 BE BE601953A patent/BE601953A/fr unknown
  • 1961-03-30 SE SE3411/61A patent/SE310899B/xx unknown
  • 1961-04-01 DE DEF33583A patent/DE1242703B/de active Pending

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