US4389544A
Expired / Lapsed
US
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Digital telephone apparatus
Assignee: Siemens Corp
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Filing: 1981-03-31
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Granted: 1983-06-21
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Expires: 2001-03-31
Abstract
Abstract Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable of transmitting PCM speech data and/or digital data from a digital data interface to a peripheral data system. The telephone apparatus comprises an internal data bus to which are connected a digital transceiver, a sync/signalling generator, a serial frame synchronizer and at least one codec/PCM filter. The transceiver transmits and receives digital data to and from the telephone transmission line. The sync/signalling generator repeatedly supplies an 8 bit first data word to the internal data bus containing a binary synchronizing code and a signalling code. Simultaneously, the serial frame synchronizer repeatedly receives from the data bus and decodes an 8 bit first data word containing a synchronizing code and a signalling code. The codec/PCM filter repeatedly receives from and transmits to said internal data bus 8 bit PCM voice samples as additional data words immediately following the first data word. A microcomputer, including a number of input/output devices, receives successive signalling codes from the serial frame synchronizer and repeatedly transmits signalling codes to the sync/signalling generator for communicating with the telephone exchange to which the apparatus is connected.
Inventors
- 👤 Theodore W. Wagner
- 👤 Sam Liang
- 👤 Deepak R. Muzumdar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:14
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/253; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
302 words
Digital telephone apparatus suitable for subscriber stations and attendant consoles and adapted to be connected for communication with a telephone transmission line, said apparatus comprising, in combination: (a) an internal data bus; (b) a digital transceiver connected to said internal data bus and adapted to be connected to said telephone transmission line for receiving and transmitting digital speech data, signalling data and other information via said transmission line and also via said internal data bus, said digital transceiver including means for transmitting and receiving signals on said transmission line which correspond to digital data received and transmitted, respectively, on said data bus; (c) a sync/signalling generator connected to said internal data bus for repeatedly generating and passing to said data bus a first data word containing a binary synchronizing code and a signalling code; (d) a serial frame synchronizer connected to said internal data bus for repeatedly receiving from said data bus and decoding a first data word containing a synchronizing code and a signalling code; (e) a microcomputer connected to said sync/signalling generator and to said serial frame synchronizer for repeatedly transmitting binary signalling information to said sync/signalling generator for formation of said first data word to be transmitted, and for repeatedly receiving binary signalling information from said serial frame synchronizer that has been decoded from a received first data word; (f) input/output means connected to said microcomputer for entering input information into, and indicating output information received from said microcomputer, said microcomputer being operative to translate between said signalling information and said input and output information; (g) a first codec/PCM filter connected with said internal data bus for converting a second data word appearing on said data bus into an analog voice signal and converting an analog voice signal into a second data word for transmission on said data bus.
Claim 2
Dependent Claim
302 words
Digital telephone apparatus suitable for subscriber stations and attendant consoles and adapted to be connected for communication with a telephone transmission line, said apparatus comprising, in combination: (a) an internal data bus; (b) a digital transceiver connected to said internal data bus and adapted to be connected to said telephone transmission line for receiving and transmitting digital speech data, signalling data and other information via said transmission line and also via said internal data bus, said digital transceiver including means for transmitting and receiving signals on said transmission line which correspond to digital data received and transmitted, respectively, on said data bus; (c) a sync/signalling generator connected to said internal data bus for repeatedly generating and passing to said data bus a first data word containing a binary synchronizing code and a signalling code; (d) a serial frame synchronizer connected to said internal data bus for repeatedly receiving from said data bus and decoding a first data word containing a synchronizing code and a signalling code; (e) a microcomputer connected to said sync/signalling generator and to said serial frame synchronizer for repeatedly transmitting binary signalling information to said sync/signalling generator for formation of said first data word to be transmitted, and for repeatedly receiving binary signalling information from said serial frame synchronizer that has been decoded from a received first data word; (f) input/output means connected to said microcomputer for entering input information into, and indicating output information received from said microcomputer, said microcomputer being operative to translate between said signalling information and said input and output information; (g) a first codec/PCM filter connected with said internal data bus for converting a second data word appearing on said data bus into an analog voice signal and converting an analog voice signal into a second data word for transmission on said data bus.
Claim 3
Dependent Claim
52 words
The telephone apparatus defined in claim 1, further comprising a second codec/PCM filter connected with said internal data bus for converting a third data word appearing on said data bus into an analog voice signal and converting an analog voice signal into a third data word for transmission on said data bus.
Claim 4
Dependent Claim
62 words
The telephone apparatus defined in claim 2, further comprising a digital data interface connected with said internal data bus for converting a third data word appearing on said data bus into a digital signal compatible with a peripheral data system, and converting a digital signal received from a peripheral data system into a third data word for transmission on said data bus.
Claim 5
Dependent Claim
39 words
The telephone apparatus defined in claim 1, further comprising a voice grade analog circuit, connected to said first codec/PCM filter for, respectively, transmitting an analog voice signal to and receiving an analog voice signal from said first codec/PCM filter.
Claim 6
Dependent Claim
53 words
The telephone apparatus defined in claim 2, further comprising a voice grade analog circuit, connected with said first codec/PCM filter and with said second codec/PCM filter for respectively transmitting to said first and second codec/PCM filters an analog voice signal and receiving from said first and second codec/PCM filters an analog voice signal.
Claim 7
Dependent Claim
54 words
The telephone apparatus defined in either claim 4 or claim 5, further comprising a telephone handset, connected to said voice grade analog circuit, said handset including transducer means for converting sound into an analog signal and for converting an analog signal into sound, said voice grade analog circuit providing amplification of said analog signals.
Claim 8
Dependent Claim
44 words
The telephone apparatus defined in claim 6, further comprising a hands free unit, connected to said voice grade analog circuit, said hands free unit including a microphone for converting sound into an analog signal and a loudspeaker for converting an analog signal into sound.
Claim 9
Dependent Claim
38 words
The telephone apparatus defined in claim 7, wherein said hands free unit further includes a circuit, connected to said voice grade analog circuit, for modifying said analog signal to prevent unwanted feedback into said microphone from said loudspeaker.
Claim 10
Dependent Claim
51 words
The telephone apparatus defined in claim 1, wherein said telephone transmission line comprises two pairs of wires, one wire pair for transmission of digital speech data away from, and one wire pair for receiving digital speech data at said telephone apparatus, whereby said telephone apparatus operates in the full duplex mode.
Claim 11
Dependent Claim
62 words
The telephone apparatus defined in claim 9, further comprising two transformers each having a primary winding, connected to one of said wire pairs, and each having a secondary winding, connected to said digital transceiver, said transformer having inductive coupling for digital speech data transmitted to said transmitting wire pair and inductive coupling for digital speech data received from said receiving wire pair.
Claim 12
Dependent Claim
50 words
The telephone apparatus defined in claim 10, further comprising a DC/DC converter, connected to said primary windings of said transformer, said DC/DC converter having means for converting a DC voltage phantomed on said two wire pairs into at least two DC voltages of different value for powering said telephone apparatus.
Claim 13
Dependent Claim
48 words
The telephone apparatus defined in claim 1, wherein said internal data bus includes a first bus wire for serial data received by said telephone apparatus, a second bus wire for serial data to be transmitted by said telephone apparatus and a third bus wire for digital clock pulses.
Claim 14
Dependent Claim
73 words
The telephone apparatus defined in claim 12, wherein said digital transceiver is connected to all three wires of said internal data bus, wherein said sync/signalling generator is connected to said second and third wires of said internal data bus, wherein said serial frame synchronizer is connected to said first and third wires of said data bus, and wherein said first codec/PCM filter is connected to all three wires of said internal data bus.
Claim 15
Dependent Claim
38 words
The telephone apparatus defined in claim 1, wherein said digital data appearing on said data bus is arranged seriatim in successive frames, each frame comprising at least said first data word immediately followed by said second data word.
Claim 16
Dependent Claim
22 words
The telephone apparatus defined in claim 14, wherein said frame further comprises a third data word immediately following said second data word.
Claim 17
Dependent Claim
21 words
The telephone apparatus defined in any one of claims 1, 14 and 15, wherein said data words are 8 bit words.
Claim 18
Dependent Claim
27 words
The telephone apparatus defined in any one of claims 1, 14 and 15, wherein said synchronizing code comprises 7 bits and said signalling code comprises one bit.
Claim 19
Dependent Claim
30 words
The telephone apparatus defined in either claim 1 or claim 14, wherein said second word contains a PCM speech sample and one frame is transmitted and received every 125 microseconds.
Claim 20
Dependent Claim
28 words
The telephone apparatus defined in claim 15, wherein said second and third words contain PCM speech samples, and wherein said frame is transmitted and received every 125 microseconds.
Claim 21
Dependent Claim
22 words
The telephone apparatus defined in claim 1, wherein said digital transceiver transmits and receives simultaneously, thereby operating in the full duplex mode.
Claim 22
Dependent Claim
26 words
The telephone apparatus recited in claim 1, wherein said digital transceiver includes means for recovering a clock signal from the signal received on said transmission line.
Claim 23
Dependent Claim
27 words
The telephone apparatus defined in claim 1, wherein said digital transceiver includes means for transmitting and receiving signals on said transmission line with alternate mark inverted encoding.
Claim 24
Dependent Claim
68 words
The telephone apparatus defined in claim 1, wherein said serial frame synchronizer includes means for generating a first enable signal when said first data word appears on said data bus and generating a second enable signal when said second data word appears on said data bus, said first enable signal being passed to said sync/signalling generator and said second enable signal being passed to said first codec/PCM filter.
Claim 25
Dependent Claim
92 words
The telephone apparatus defined in claim 2, wherein said serial frame synchronizer includes means for generating a first enable signal when said first data word appears on said data bus, a second enable signal when said second data word appears on said data bus and a third enable signal when said third data word appears on said data bus, said first enable signal being passed to said sync/signalling generator, said second enable signal being passed to said first codec/PCM filter and said third enable signal being passed to said second codec/PCM filter.
Claim 26
Dependent Claim
42 words
The telephone apparatus defined in claim 23 or 24, wherein said sync/signalling generator is responsive to said first enable signal and to a clock signal appearing on said internal data bus to serially pass said first data word onto said data bus.
Claim 27
Dependent Claim
34 words
The telephone apparatus defined in claim 1, wherein said input/output means include a telephone hook switch operable by the user of said telephone apparatus for placing said apparatus in the "on-hook" or "off-hook" condition.
Claim 28
Dependent Claim
29 words
The telephone apparatus defined in claim 1, wherein said microcomputer converts signalling information received from said serial frame synchronizer into output information and converting input information into signalling information.
Claim 29
Dependent Claim
55 words
The telephone apparatus defined in claim 1, wherein said microcomputer includes means for formating a sequence of bits comprising, in succession, start, signalling and stop bits, said microcomputer transmitting said bits to said sync/signalling generator for inclusion in successive ones of said first data word, thereby defining a superframe for transmission on said transmission line.
Claim 30
Dependent Claim
41 words
The telephone apparatus defined in claim 28, wherein said microcomputer receives, in succession, start, signalling and stop bits from said serial frame synchronizer and synchronizes itself to said succession of bits so as to identify those bits representing a signalling word.
Claim 31
Dependent Claim
54 words
The telephone apparatus defined in claim 3, wherein both said second codec/PCM filter and said digital data interface are operative to transmit to and receive from said internal data bus a third data word, and wherein said microcomputer includes means for selecting either said second codec/PCM filter or said digital data interface for operation.
Claim 32
Dependent Claim
40 words
The telephone apparatus defined in claim 5, wherein said microcomputer is connected to said voice grade analog circuit, said microcomputer being operative to configure said voice grade analog circuit for operation with one of said first and second codec/PCM filters.
Claim 33
Dependent Claim
18 words
The telephone apparatus defined in claim 1, wherein said input/output means include dial keys for selecting telephone numbers.
Claim 34
Dependent Claim
23 words
The telephone apparatus defined in claim 1, wherein said input/output means include line keys for selecting one of a plurality of telephone lines.
Claim 35
Dependent Claim
23 words
The telephone apparatus defined in claim 1, wherein said input/output means include function keys for selecting one of a plurality of telephone functions.
Claim 36
Dependent Claim
18 words
The telephone apparatus defined in claim 1, wherein said input/output means include a display for indicating alphanumeric characters.
Claim 37
Dependent Claim
18 words
The telephone apparatus defined in claim 1, wherein said input/output means include a printer for printing alphanumeric characters.
Claim 38
Dependent Claim
33 words
The telephone apparatus defined in claim 21, wherein identical signalling information is repeatedly transmitted to said microcomputer, and wherein said microcomputer compares successively received signalling information to determine the existence of bit errors.
Claim 39
Dependent Claim
30 words
The telephone apparatus defined in claim 37, wherein said identical signalling information is transmitted three times in succession, and wherein said microcomputer determines the correct signalling information by majority vote.
Claim 40
Dependent Claim
62 words
The telephone apparatus defined in claim 1, further comprising a digital data interface connected with said internal data bus for converting a third data word appearing on said data bus into a digital signal compatible with a peripheral data system, and converting a digital signal received from a peripheral data system into a third data word for transmission on said data bus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |