Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
254 words
A speakerphone for a radiotelephone for communicating voice signals by way of a radio channel, said radiotelephone including radio means (112) for transmitting a first signal including voice signals on and receiving a second signal including voice signals from the radio channel, said speakerphone including microphone means (102) for producing the first signal and speaker means (104) for emitting the second signal and said speakerphone further CHARACTERIZED BY: compressor amplifying means (203) having an input coupled to said microphone means and an output coupled to said radio means and being responsive to first control signals for selecting one of a plurality of gain settings and amplifying and compressing the first signal; expander amplifying means (233) having an input coupled to said radio means and an output coupled to said speaker means and being responsive to second control signals for selecting one of a plurality of gain settings and amplifying and expanding the second signal; and control means (106) coupled to the output of said compressor amplifying means and the input of said expander amplifying means for detecting voice signals in the first and second signals and, in response to detection of voice signals in one of the first and second signals, producing the first and second control signals for adjusting the gain settings of said compressor amplifying means and said expander amplifying means such that the gain setting for said one of the first and second signals is increased and the gain setting of the other of the first and second signals is decreased.
Claim 2
Dependent Claim
254 words
A speakerphone for a radiotelephone for communicating voice signals by way of a radio channel, said radiotelephone including radio means (112) for transmitting a first signal including voice signals on and receiving a second signal including voice signals from the radio channel, said speakerphone including microphone means (102) for producing the first signal and speaker means (104) for emitting the second signal and said speakerphone further CHARACTERIZED BY: compressor amplifying means (203) having an input coupled to said microphone means and an output coupled to said radio means and being responsive to first control signals for selecting one of a plurality of gain settings and amplifying and compressing the first signal; expander amplifying means (233) having an input coupled to said radio means and an output coupled to said speaker means and being responsive to second control signals for selecting one of a plurality of gain settings and amplifying and expanding the second signal; and control means (106) coupled to the output of said compressor amplifying means and the input of said expander amplifying means for detecting voice signals in the first and second signals and, in response to detection of voice signals in one of the first and second signals, producing the first and second control signals for adjusting the gain settings of said compressor amplifying means and said expander amplifying means such that the gain setting for said one of the first and second signals is increased and the gain setting of the other of the first and second signals is decreased.
Claim 3
Dependent Claim
54 words
The speakerphone according to claim 1, CHARACTERIZED IN THAT said compressor amplifying means (203) includes first register means (218) for storing the first control signals, said expander amplifying means includes second register means (219) for storing the second control signals, and said control means (106) is coupled to said first and second register means.
Claim 4
Dependent Claim
97 words
The speakerphone according to claim 1, further CHARACTERIZED BY first switch means (204) coupled between the output of said compressor amplifying means (203) and said radio means (112) and being responsive to a third control signal for substantially muting the first signal, and further including second switch means (234) coupled between the output of said expander amplifying means (233) and said speaker means (104) and being responsive to a fourth control signal for substantially muting the second signal, said control means coupled to said first and second switch means for producing the third and fourth control signals.
Claim 5
Dependent Claim
52 words
The speakerphone according to claim 1, further CHARACTERIZED BY analog-to-digital converter means (225) alternately coupled to the output of said compressor amplifying means and the input of said expander amplifying means, said control means (106) coupled to said analog-to-digital converter means (225) for detecting voice signals in the first and second signals.
Claim 6
Dependent Claim
165 words
The speakerphone according to claim 1, CHARACTERIZED IN THAT wherein said compressor amplifying means includes a first register (218) for storing the first control signals, a compressor amplifier (203) having an output coupled to said radio means (112) and an input, and a variable gain amplifier (202) having a plurality of gain settings selected by the first control signals and having an input coupled to said microphone means and an output coupled to the input of said compressor amplifier; and wherein said expander amplifying means includes a second register (219) for storing the second control signals, an expander amplifier (233) having an input coupled to said radio means (112) and an output, and a variable gain amplifier (235) having a plurality of gain settings selected by the second control signals and having an input coupled to the output of said expander amplifier and an output coupled to said speaker means (104); and wherein said control means (106) is coupled to said first and second registers.
Claim 7
Dependent Claim
19 words
The speakerphone according to claim 1, 2, 3, 4 or 5, wherein said control means includes microcomputer means (220).