Signal transmission method and signal transmission apparatus
First Claim
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1. A signal transmission apparatus in which a 1-bit digital signal output from a Σ
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modulator is transmitted over a transmission system, the apparatus comprising;
phase modulation means for phase-modulating the 1-bit digital signal output from the Σ
Δ
modulator and generating a phase-modulated 1-bit signal for transmission over the transmission system;
means connected to the phase modulation means for providing a clock signal to the phase modulation means to establish a pre-set transmission rate equal to a transmission rate of the 1-bit digital signal output from the Σ
Δ
modulator; and
phase demodulation means for demodulating the phase-modulated 1-bit signal output from the transmission system,wherein the 1-bit digital signal transmitted over the transmission system is prevented from being deteriorated due to power source variations and radiation noise.
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Abstract
A high-quality transmission apparatus for a 1-bit digital signal. The 1-bit digital signal is transmitted via a phase modulator arranged upstream of a transmission route and demodulated by a phase demodulator arranged downstream of the transmission route for suppressing the jitter caused by power source variations and radiation noise during transmission.
15 Citations
9 Claims
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1. A signal transmission apparatus in which a 1-bit digital signal output from a Σ
- Δ
modulator is transmitted over a transmission system, the apparatus comprising;phase modulation means for phase-modulating the 1-bit digital signal output from the Σ
Δ
modulator and generating a phase-modulated 1-bit signal for transmission over the transmission system;means connected to the phase modulation means for providing a clock signal to the phase modulation means to establish a pre-set transmission rate equal to a transmission rate of the 1-bit digital signal output from the Σ
Δ
modulator; andphase demodulation means for demodulating the phase-modulated 1-bit signal output from the transmission system, wherein the 1-bit digital signal transmitted over the transmission system is prevented from being deteriorated due to power source variations and radiation noise. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal transmission method in which a 1-bit digital signal output from a Σ
- Δ
modulator is transmitted over a transmission system, the method comprising the steps of;phase modulating the 1-bit digital signal output from the Σ
Δ
modulator based on a clock signal which establishes a pre-set transmission rate equal to a transmission rate of the 1-bit digital signal output from the Σ
Δ
modulator;transmitting the phase-modulated 1-bit signal obtained by phase modulation of the 1-bit digital signal output from the Σ
Δ
modulator over the transmission system; anddemodulating the phase-modulated 1-bit signal output from the transmission system based on the pre-set transmission rate in order to prevent deterioration of the transmitted 1-bit digital signal due to at least one of power source variations and radiation noise.
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8. A signal transmission apparatus in which a 1-bit digital signal output from a Σ
- Δ
modulator is transmitted over a transmission system, the apparatus comprising;means providing a clock signal for establishing a pre-set transmission rate; a first D-latch for latching the 1-bit digital signal output from the Σ
Δ
modulator and generating a phase-modulated signal in response to the clock signal; anda second D-latch for latching the phase-modulated signal transmitted over the transmission system and generating the 1-bit digital signal in response to a rising edge of the clock signal, wherein pre-set transmission rate set by the clock signal is equal to a transmission rate of the 1-bit digital signal output from the Σ
Δ
modulator.
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9. A signal transmission apparatus in which a 1-bit digital signal output from a Σ
- Δ
modulator is transmitted over a transmission system, the apparatus comprising;phase modulation means for phase-modulating the 1-bit digital signal output from the Σ
Δ
modulator and generating a phase-modulated 1-bit signal which is transmitted over the transmission system;means connected to the phase modulation means for providing a clock signal to the phase modulation means to establish a pre-set transmission rate equal to a transmission rate of the 1-bit digital signal output from the Σ
Δ
modulator; andphase demodulation means for demodulating the phase-modulated 1-bit signal transmitted over the transmission system, the phase demodulation means including clock auto-extraction means for extracting clock components from the phase-modulated 1-bit signal for locking a phase-locked-loop for bit synchronization, wherein the 1-bit digital signal transmitted over the transmission system is prevented from being deteriorated due to power source variations and radiation noise.
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Specification