Multi-mode signal processing
First Claim
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1. A multi-mode radio communications apparatus, comprising:
- receiver circuit for receiving transmitted signals and for converting said signals into received signals;
a transmit circuit for modulating and transmitting transmission signals;
signal processing circuitry for processing said received signals and said transmission signals, said signal processing circuitry being switchable between analog or digital communication modes; and
switching means, operatively connected to said signal processing circuitry, for switching said signal processing circuitry between said analog and said digital communication modes;
wherein a majority of the receiver circuit, transmit circuit and signal processing circuitry processes said received signals and said transmission signals in both said analog and said digital communication modes without using separate signal paths for said received signals in said analog and said digital communication modes.
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Abstract
A digital system accommodates analog communications, thus avoiding the need for separate subsystems each dedicated to either analog or digital communications. The system includes a receive circuit for converting received signals into an intermediate frequency, a transmit circuit for modulating and transmitting signals and signal processors for processing the intermediate frequency signals and the signals to be transmitted, wherein the signals can be processed into digital or analog format using substantially the same circuitry.
181 Citations
12 Claims
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1. A multi-mode radio communications apparatus, comprising:
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receiver circuit for receiving transmitted signals and for converting said signals into received signals; a transmit circuit for modulating and transmitting transmission signals; signal processing circuitry for processing said received signals and said transmission signals, said signal processing circuitry being switchable between analog or digital communication modes; and switching means, operatively connected to said signal processing circuitry, for switching said signal processing circuitry between said analog and said digital communication modes; wherein a majority of the receiver circuit, transmit circuit and signal processing circuitry processes said received signals and said transmission signals in both said analog and said digital communication modes without using separate signal paths for said received signals in said analog and said digital communication modes.
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2. A multi-mode radio communications apparatus, comprising:
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receiver circuit for receiving transmitted signals and for converting said signals into received signals; a transmit circuit for modulating and transmitting transmission signals; signal processing circuitry for processing said received signals and said transmission signals, said signal processing circuitry being switchable between analog or digital communication modes, wherein said signal processing circuitry includes a transmit digital signal processor and a separate receive digital signal processor; and switching means, operatively connected to said signal processing circuitry, for switching said signal processing circuitry between said analog and said digital communication modes; wherein a majority of the receiver circuit, transmit circuit and signal processing circuitry processes signals in both said analog and said digital communication modes without using separate signal paths for said received signals in said analog and said digital communication modes. - View Dependent Claims (3, 4, 5, 6)
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7. A multi-mode cellular radio telephone capable of transmitting analog speech in an analog-FM mode or digital speech in an allocated timeslot of a repetitive time division multiple access (TDMA) frame period, comprising:
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means for digitizing a speech signal for transmission to produce a representative stream of numerical samples; processing means for processing said numerical samples in order to generate I and Q signals representing, in an analog mode, vector components of a continuous frequency modulated radio signal or, alternatively, in a digital mode, representing vector components of a digitally modulated TDMA burst signal; and quadrature modulator means for processing said I and Q signals to obtain, in said analog mode, said continuous frequency modulated radio signal or, alternatively, in said digital mode, to generate said TDMA burst signal in said allocated timeslot. - View Dependent Claims (8)
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9. A multi-mode cellular radio telephone capable of receiving digital speech signals or analog speech signals comprising:
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down conversion means to convert a received signal to a intermediate signal in a digital speech reception mode and an analog speech reception mode; vector analog-to-digital conversion means to convert said intermediate signal in said digital speech reception mode and said analog speech reception mode to a stream of complex numbers preserving phase and amplitude information; numerical processing means capable of processing said stream of complex numbers in said digital speech reception mode and said analog speech reception mode in order to obtain speech samples; and D-to-A conversion means to process said speech samples into an analog signal waveform for driving a speaker. - View Dependent Claims (10)
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11. A multi-mode cellular radio telephone capable of transmitting analog speech in an analog-FM mode or digital speech in an allocated timeslot of a repetitive time division multiple access (TDMA) frame period in a digital mode, comprising:
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means for digitizing a speech signal for transmission to produce a representative stream of numerical samples; processing means for processing said numerical samples in order to generate at least one transmission signal representing, in analog mode, vector components of a continuous frequency modulated radio signal or, alternatively, in said digital mode, representing vector components of a digitally modulated TDMA burst signal; and modulator means for modulating said at least one transmission signal to obtain, in said analog mode, said continuous frequency modulated radio signal or, alternatively, in said digital mode, to generate said TDMA burst signal in said allocated timeslot. - View Dependent Claims (12)
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Specification