Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A communication system providing a relatively high fidelity audio signal and an audio signal transmission channel characterized by a pass band which is narrower than and respectively transmits only a portion of the frequency components making up such relatively high fidelity audio signal, signal processing means for processing the relatively high fidelity audio signal components and improving the fidelity thereof as utilized in receiver means receiving an audio signal input only from such transmission channel, said signal processing means comprising: means for eliminating a narrow sub-band of frequencies from the audio signal; means translating low frequencies of such audio signals which do not fall within said pass band to obtain a frequency-displaced signal having frequency components which fall within a relatively narrow sub-band of less than 500 cps; means applying such frequency-displaced signal to the relatively low fidelity transmission channel at the portion of the eliminated sub-band; means receiving such frequency-displaced signal; means for restoring such frequency-displaced signal to its original frequency range; and a summation circuit for adding the stored frequency-displaced signal to the receiver means.
Claim 2
Dependent Claim
177 words
A communication system providing a relatively high fidelity audio signal and an audio signal transmission channel characterized by a pass band which is narrower than and respectively transmits only a portion of the frequency components making up such relatively high fidelity audio signal, signal processing means for processing the relatively high fidelity audio signal components and improving the fidelity thereof as utilized in receiver means receiving an audio signal input only from such transmission channel, said signal processing means comprising: means for eliminating a narrow sub-band of frequencies from the audio signal; means translating low frequencies of such audio signals which do not fall within said pass band to obtain a frequency-displaced signal having frequency components which fall within a relatively narrow sub-band of less than 500 cps; means applying such frequency-displaced signal to the relatively low fidelity transmission channel at the portion of the eliminated sub-band; means receiving such frequency-displaced signal; means for restoring such frequency-displaced signal to its original frequency range; and a summation circuit for adding the stored frequency-displaced signal to the receiver means.
Claim 3
Dependent Claim
39 words
A communications system according to claim 1, wherein the range of frequencies blocked from the relatively low fidelity transmission channel is somewhat greater than the range of low frequencies translated in frequency to fall within the blocked sub-band frequencies.
Claim 4
Dependent Claim
26 words
A communications system according to claim 2, wherein the blocked sub-band of frequencies is in the upper midrange portion of the relatively low frequency audio signal.
Claim 5
Dependent Claim
182 words
A communication system providing a relatively high fidelity audio signal and an audio signal transmisstion channel characterized by a pass band which is narrower than and respectively transmits only a portion of the frequency components making up such relatively high fidelity audio signal components and improving the fidelity thereof as utilized in receiver means receiving and audio signal input only from such transmission channel, said signal processing means comprising: a band rejection filter connected in series with the transmisstion channel for eliminating a narrow sub-band of frequencies therefrom; means translating low frequencies of such high fidelity audio signals which do not fall within said pass band to obtain a frequency-displaced signal having frequency components which fall within a relatively narrow sub-band of less than 500 cps; means applying such frequency-displaced signal to the relatively low fidelity transmission channel at the portion of the narrow sub-band; means receiving such frequency-displaced signal; means including a demodulator coupled to an oscillator for restoring such frequency-displaced signal to its original frequency range; and a summation circuit for adding the restored frequency-displaced signal to the receiver means.
Claim 6
Dependent Claim
182 words
A communication system providing a relatively high fidelity audio signal and an audio signal transmisstion channel characterized by a pass band which is narrower than and respectively transmits only a portion of the frequency components making up such relatively high fidelity audio signal components and improving the fidelity thereof as utilized in receiver means receiving and audio signal input only from such transmission channel, said signal processing means comprising: a band rejection filter connected in series with the transmisstion channel for eliminating a narrow sub-band of frequencies therefrom; means translating low frequencies of such high fidelity audio signals which do not fall within said pass band to obtain a frequency-displaced signal having frequency components which fall within a relatively narrow sub-band of less than 500 cps; means applying such frequency-displaced signal to the relatively low fidelity transmission channel at the portion of the narrow sub-band; means receiving such frequency-displaced signal; means including a demodulator coupled to an oscillator for restoring such frequency-displaced signal to its original frequency range; and a summation circuit for adding the restored frequency-displaced signal to the receiver means.
Claim 7
Dependent Claim
22 words
A communications system according to claim 4, wherein the frequencies blocked by the rejection filter are greater than 1.5 kilocycles per second.
Claim 8
Independent Claim
118 words
A method of transmitting a high fidelity audio signal over a low fidelity transmission line which is narrower than the high fidelity audio signal which includes the steps of: a. attenuating a first band of frequencies from the audio signal, said first band lying withiN the limits of the frequencies passed by the low fidelity line; b. separating a second band of low frequencies from the signal, said second band lying below the lowest frequency passed by the low fidelity line; c. transferring the second band of frequencies to said first band by modulation means; and d. applying the signal minus the first and second bands of frequencies plus the transferred frequencies to the low fidelity transmitting line.
Claim 9
Independent Claim
118 words
A method of transmitting a high fidelity audio signal over a low fidelity transmission line which is narrower than the high fidelity audio signal which includes the steps of: a. attenuating a first band of frequencies from the audio signal, said first band lying withiN the limits of the frequencies passed by the low fidelity line; b. separating a second band of low frequencies from the signal, said second band lying below the lowest frequency passed by the low fidelity line; c. transferring the second band of frequencies to said first band by modulation means; and d. applying the signal minus the first and second bands of frequencies plus the transferred frequencies to the low fidelity transmitting line.
Claim 10
Dependent Claim
79 words
A method as claimed in claim 6 wherein the transmitted signal is transformed into a high fidelity signal at the other end of the line by the steps which include: a. applying the received signal minus the first band of frequencies to a summation circuit; b. separating the transferred frequencies from the received signal; c. demodulating the transferred frequencies to produce the original second band of frequencies; and d. applying the second band of frequencies to the summation circuit.