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Electronic telephone set
| Details |
Inventors: Geboers, Josephus J. A.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Dwyer; James L.
Assistant Examiner: Shehata; Magdy W.
Attorney, Agent or Firm: Barschall; Anne E.
Electronic telephone set, comprising a transmission circuit arranged for being coupled to a telecommunication network and for receiving and transmitting speech signals, a keyboard means comprising a first matrix with respective numbers of intersecting first and second conductors and at the intersections of the first and second conductors key switches coupled to the respective first and second conductors for producing dial information and status information and including a second matrix with one intersecting first and second conductor or a plurality thereof respectively, and having setting circuits conducting current in one and the same direction coupled to the respective first and second conductors at selected intersections of the latter first and second conductors, whereas all second conductors of the second matrix are arranged common to those of the first matrix, and including a control circuit arranged for generating dialling signals compatible with the telecommunication network in response to the dialling information produced by the keyboard means and controlling the operation of the telephone set in response to the status information produced by the keyboard means, which control circuit comprises scanning means for reading the two matrices, characterized in that all first conductors of the second matrix are in common with those of the first matrix and in that the scanning means scan the first conductors when reading the first matrix and scan the second conductors when reading the second matrix. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
1 is shown the transmission circuit 1 connected to a telephone line.
The transmission circuit 1 receives speech signals through a photo-electric coupler 5 from a receiving circuit 4, which in its turn supplies information to a microcontrol circuit 2 which receives information from keyboard means 3 and transmits tone dial information DTMF to the transmission circuit 1, again via photo-electric coupler 5.
A transmitter means comprising the series arrangement of a modulator 8, oscillator 9 and hf power amplifier 10 receives, via photo-electric coupler 6, speech signals from the transmission circuit 1.
The control circuit 2 delivers release signals to the modulator 8, oscillator 9 and hf power amplifier 10.
The micro-control circuit 2 finally receives ringing signals from the telephone line via photo-electric coupler 7.
The transmitter means 8, 9 and 10 transmits modulated speech signals into the air at a first frequency, for example, 49 MHz, via a duplex filter 11 and the aerial 42.
The receiving circuit 4 receives through the air via the mixer 41 speech signals modulated at a second frequency, for example 46 MHz, by means of the duplex filter 11 and aerial 42.
As indicated by a dashed line the control circuit 2 can supply dial pulses in lieu of dial tones to the telephone line.
All blocks shown in FIG.
1 are considered to be well known.
The transmission circuit 1 may again be an integrated circuit of the TEA 1060 family.
The receiving circuit 4 may be the integrated circuit NE 614 or the integrated circuit MC 3361 in combination with PLL-IC NE 567.
The photo-electric couplers 5, 6 and 7 may be the ones with the type-references CNG 36 and CNX 38.
The mixer 41 may be the integrated circuit NE 612.
The transmitter 8, 9 and 10 may be composed of discrete components, whereas for the UHF frequency band use can be made of amplifier modules such as BGY 95 and BGY 90.
The integrated circuit BCD 3344 may be used for the control circuit 2.
This is a micro-control switch with an 8-bit central processor unit, DTMF generator and RAM housed on the same chip
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