Victor Company of Japan, Limited

Matsushita Electric Industrial Co., Ltd.

Yukinobu Ishigaki

Kazutoshi Hirohashi

Teruo Muraoka

Kaoru Totsuka

Kohei Sasamura

Naotaka Miyaji

Yutaka Haramoto

Makoto Yamamoto

Yasuomi Namiki

Hiroshi Matsushima

Kiyotake Fukui

Takahisa Matsumoto

Yasuo Itoh

Yutaka Ichinoi

Takaro Mori

Masami Yamazaki

Hisashige Fujiwara

Tadashi Abe

Hideaki Ozaki

Takao Kawasaki

Kunihiro Kato

Kenichi Mizuno

Isao Ohwaki

Masahiro Ohba

Fumio Kawabata

Katsuhiro Onuki

Masaki Hagihara

Takeo Nasu

A spread spectrum modulating and demodulating apparatus which is capable of providing FSK or PSK spread spectrum communications. In a transmitting device an input information signal is fed either to an oscillator or to a side of a power supply which is in turn connected to an operation device. An oscillator produces a carrier frequency signal which multiplied by a multiplier by the predetermined integer N1. A frequency divider divides the frequency of the carrier by a predetermined integer N2. A spread code generator uses an output signal of the frequency divider as a clock signal, and generates a spread code which is fed to the operation device. A switch selectively feeds an input information signal to either the oscillator for frequency shift keying the oscillator or through the side of the power supply connected to the operation device will effect a phase shift key operation. A spread spectrum demodulating device additionally provides for demodulation of either a frequency shift keyed signal or a phase shift keyed signal.

Spread spectrum modulating and demodulating apparatus for transmission

A frequency converting circuit has a phase divider, a switching circuit, and switching pulse generator. The phase divider divides a phase of a first input signal and outputting m-units of channel signals having a same frequency but different phases shifted 2.pi./m by 2.pi./m radian respectively, where m is a three or more natural number except 2.sup.n (n: a natural number). The m-units of the channel signals are switched by the switching circuit to output switched channel signals. In response to a second input signal having a frequency higher than that of the first input signal, the switching pulse generator generates switching pulse signals, and switches and outputs the m-units of channel signals having different phases shifted 2.pi./m by 2.pi./m radian for each constant period, by controlling the switching circuit based on the switching pulse signals. The switched channel signals are synthesized to output a signal having a frequency difference between the first input signal and the switching pulse signals or a frequency addition of the first input signal and the switching pulse signals.

Frequency converting circuit

This invention provides a frequency converting circuit that does not require balance adjustment, can be used in a broad frequency band, and is well-suited to implementation in the form of an integrated circuit. A first input signal undergoes a phase shift into 2.sup.o (where n is a natural number of 2 or greater) respective channel signals, each with a different phase, for output. A second input signal is used to generate switch signals 10 numbered 1 . . . n. The 2.sup.n channel signals are switched according to the first switch signal, reducing the number of channels by 1/2, for output. The output of the (m-1) th switch (where m is a natural number of 2 . . . n) is switched according to the mth switch signal, reducing the number of channels by 1/2 for output, at switch m. This process is repeated continuously from switches 2-n until the signal is output as a single channel signal.

A frequency converting circuit which requires no balance regulation, is usable in a wide frequency band and is suitable to be incorporated in an integrated circuit. A first input signal is supplied to an input terminal 1 and a phase division circuit 2 to produce two phase divided signals from the first input signal. A second input signal is supplied to an input terminal 4 of a switch signal generating circuit 5 which produces two switch signals from the second input signal. A first one of the two switch signals and the two phase divided signals are supplied to a first switch 3. Switch 3 selectively outputs one of the two phase divided signals responsive to the first one of the two switch signals. Another output of the first switch 3 is a signal obtained by inverting a phase of the one selected output signal of switch 3 by means of the phase invertor/amplifier 6. The inverted switch signal of invertor/amplifier 6 is applied to a switch 7 which selectively outputs one of the output signals of this switch 3 and an inverted signal output from the phase invertor/amplifier 6, responsive to the second one of the two switch signals.

A spread spectrum modulating apparatus includes an oscillator outputting a carrier. A frequency multiplier multiplies a frequency of the carrier by a predetermined integer N1. A frequency divider divides the frequency of the carrier by a predetermined integer N2. A spread code generator uses an output signal of the frequency divider as a clock signal, and generates a spread code in response to the clock signal. A power supply feeds a dc bias voltage. An operation device executes a predetermined logic operation between the spread code and the dc bias voltage of the power supply. A switch selectively feeds an input information signal to either the oscillator or the point of connection of the power supply to the operation device, selecting between PSK and FSK as primary modulation. An output signal of the operation device and an output signal of the frequency multiplier are multiplied to execute a spectrum spreading process.

Spread spectrum modulating apparatus using either PSK or FSK primary

A receiving device for receiving spread spectrum-modulated GPS signal transmitted from GPS (Global Positioning System) satellites to the earth. Received GPS signals are converted into IF signals which are despread-demodulated on the basis of C/A codes, resulting in demodulated PSK signals. Carriers are reproduced from the IF signals and a clock signal for C/A code generator is produced from the reproduced carrier and a local oscillation signal. The PSK signal is demodulated on the basis of a reference frequency of a PLL circuit to obtain a navigation message.

Receiving device for receiving and demodulating spread

A spread spectrum communication system comprising a transmitter including an angle modulator, a frequency divider, a spread code generator, and a spread spectrum modulator, and a receiver including a despreading circuit, an angle demodulator, a sync detection circuit, and a clock signal generating circuit. In the transmitter, the spread code generator produces a spread code having correlation with the angle-modulated signal outputted from the angle modulator. In the receiver the despreading circuit despreads the spread spectrum modulation signal sent from the transmitter by a demodulation spread code. The angle demodulator generates a demodulation output by means of a phase-locked loop circuit contained therein. The sync detection circuit detects sync condition on the basis of noise level of a phase detector provided in the phase-locked loop circuit, and generates a sync detection signal when sync condition is established. And, the clock signal generating circuit responds the sync detection signal to switch a demodulation clock from a temporary clock used for capturing a sync time to a regular clock which is equivalent to a modulation clock signal used in the transmitter.

Spread spectrum communication system

A demodulation system for spread spectrum communication includes a first low pass filter for processing an input spread spectrum signal including a product of an information signal and a first spread code. A second spread code is generated which is equivalent to the first spread code. A second low pass filter processes the second spread code and has a transfer function substantially equal to a transfer function of the first low pass filter. An absolute value circuit derives an absolute value of an output signal from the second low pass filter. A division circuit derives a reciprocal of an output signal from the absolute value circuit. A delay circuit delays the second spread code by a predetermined time. A first multiplier multiplies an output signal from the division circuit and an output signal from the delay circuit, and generates a third spread code in response to the output signals from the division circuit and the delay circuit. A second multiplier multiplies an output signal from the first low pass filter and the third spread code, despreading the output signal from the first low pass filter with the third spread code and recovering the information signal from the output signal of the first low pass filter.

Demodulation system for spread spectrum communication

A modulation and demodulation system for spread spectrum transmission comprises modulation and demodulation sections. The modulation section spreads/modulates an input information signal by multiplying by a PN code to provide a spread spectrum signal. The demodulation section despreads/demodulates the spread spectrum signal including interference mixed therein by substantially using the same spread code. In the demodulation section, a first multiplier despreads the received signal by multiplying by the PN code to provide a despread demodulation signal, a high-pass filter extracts a first spread interference signal from the despread demodulation signal, a second multiplier multiplies the spread interference signal by a high-frequency range emphasized PN code, a low-pass filter attenuates high-frequency range components of the output signal of the second multiplier, a third multiplier multiplies the output signal of the low-pass filter by a high-frequency range attenuated PN code, an emphasizing circuit emphasizes low-frequency range components of the output signal of the third multiplier to provide a second spread interference signal, and a subtracter obtains the difference between the second spread interference signal and the despread demodulation signal to provide the interference-free demodulated information signal.

Modulation and demodulation system for spread spectrum transmission

A spread spectrum communication system having a modulation unit for modulating and spreading an information signal by one or more of carrier signals and a spread code and transmitting it as a radio wave, and a demodulation unit for despreading and demodulating a received radio wave to pick up the information signal. The modulation unit includes a synthesizing and modulating unit for synthesizing a first primary modulated signal obtained by modulating a first carrier by the information signal and a second primary modulation signal obtained by modulating a second carrier, and a spectrum spreading unit for spreading the synthesized first and second primary modulation signals with a spread code to generate a spread spectrum signal containing first and second spread signal components. The demodulation unit includes a separation unit for separating a received spread spectrum signal into the first and second spread signals, a spread signal reproduction unit for reproducing the spread code on the separated first and second spread signal component, and a despreading unit for despreading the separated first spread signal component and reproduced spread code to reproduce the information signal.

There is disclosed a spread spectrum communication system comprising a modulation unit provided in the transmission side for transmitting a composite spread spectrum signal after modulating an information signal by the first and second carrier, and a demodulation unit in the reception side having an automatic gain control (AGC) function and for demodulating a primary-modulated signal by spread code generated therein or despreading. The demodulating unit comprises an input circuit for receiving the composite spread spectrum signal, a control circuit for controlling a level of the composite spread spectrum signal, a separating circuit for separating a spread code signal and a spread spectrum signal from the composite signal, a circuit for generating the primary-modulated signal based on the spread code, a detecting circuit for detecting an envelope signal of the demodulated primary-modulated signal from the generating circuit, a converting circuit for converting the envelope signal into a control signal, and a supplying circuit for supplying the control signal to the control circuit.

A transmitter of a spread spectrum communication system uses a first carrier, a second carrier, a third carrier, a first spread code, and a second spread code. The third carrier is generated by shifting the phase of the first carrier. The second spread code is generated by delaying the first spread code. The first carrier is modulated with an information signal to generate a primary modulation signal. A composite spread spectrum signal is generated by combining and mixing the primary modulation signal, the second carrier, the third carrier, the first spread code, and the second spread code. In a receiver of the system, a separation filter separates the composite spread spectrum signal into a first component and a second component related to the frequency of the first carrier and the frequency of the second carrier respectively. A signal corresponding to the primary modulation signal is demodulated by processing the first and second components of the composite spread spectrum signal. A fourth carrier synchronous with the demodulated signal is derived by processing the first and second components of the composite spread spectrum signal. The information signal is detected by mixing the demodulated signal and the fourth carrier.

A PLL circuit having a function of a frequency multiplier comprises a phase detector circuit receiving an input signal, for producing an error signal which includes an alternating current component having a relatively high frequency depending on the frequency of a frequency-multiplied signal, a low pass loop filter, a voltage controlled oscillator, and a comparison signal generating circuit for generating N phase comparison signals. The phase detector circuit comprises a phase splitting circuit for generating from the input signal N phase split signals having respectively different N phases and N phase detectors for comparing the phases of the N phase split signals with different phases of the N phase comparison signal respectively.

Phase-locked loop circuit

A scrambler system comprises in a transmitter part thereof as oscillator circuit for generating a local oscillation signal, a frequency dividing circuit for obtaining a frequency divided signal by frequency-dividing the local oscillation signal by 1/N, a triangular wave signal generating circuit for converting the frequency divided signal into a triangular wave signal and for controlling the oscillation frequency of the oscillator circuit by the triangular wave signal, a multiplying circuit for obtaining a frequency converted audio signal by multiplying the local oscillation signal with an input audio signal which is to be scrambled, a pilot signal generating circuit for generating from the frequency divided signal a pilot signal having a single frequency, and an adding circuit for obtaining a scrambled signal for transmission by adding the pilot signal and the frequency converted audio signal. A key is used for de-scrambling the scrambled signal in a receiver part of the scrambler system.

Scrambler system

A rotary head type magnetic recording and reproducing apparatus comprises a circuit for recording and reproducing a signal on and from a magnetic recording medium by rotary heads, a circuit for obtaining a frequency modulated (FM) audio signal by frequency-modulating a carrier by an audio signal which is to be recorded, a circuit for generating a frequency drift detection signal having a constant frequency which does not exist within a frequency range occupied by the FM audio signal, a circuit for obtaining a frequency multiplexed signal by frequency-multiplexing the FM audio signal and the detection signal, a circuit for separating the FM audio signal and the detection signal from the signal reproduced by the rotary heads, a demodulating circuit for obtaining an audio signal by frequency-demodulating the separated FM audio signal, a detecting circuit for frequency-demodulating the separated detection signal and for detecting a frequency drift component, a circuit for forming a frequency drift correction signal responsive to the output of the detecting circuit, and a circuit for correcting a frequency drift component in the output audio signal of the demodulating circuit by the correction signal.

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Machida, Japan

Yukinobu Ishigaki