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    RADIO TRANSMITTER MODULATION CONTROL CIRCUITRY
    2.
    发明专利
    RADIO TRANSMITTER MODULATION CONTROL CIRCUITRY 未知

    公开(公告)号：DE3277676D1

    公开(公告)日：1987-12-17

    申请号：DE3277676

    申请日：1982-04-19

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04

    Abstract: Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inventive modulation control circuitry includes a microphone (110), audio amplifier (120), splatter filter (130), modulator (150), potentiometer (140), oscillator and transmitter (180), and antenna (190). The audio amplifier (120) further includes an operational amplifier (160) having an input resistor (162) coupled via capacitor (168) to microphone (110), a phase-lag filter (170) coupled to the output of the operational amplifier (160), and a feedback resistor (161) coupled between the filter (170) and the input resistor (162). When driven into amplitude limiting, the phase and amplitude of harmonic signals from the operational amplifier (160) are altered by phase-lag filter (170) to produce a waveform similar to that shown in Fig. 2. When operated linearly, the audio amplifier (120) has a flat frequency response, the filter (170) having no effect since it is in the feedback loop. The improved modulation control circuitry of the present invention can be advantageously utilized in both amplitude and frequency modulated radios (100) for enhancing the audio signal quality thereof.

    3.
    发明专利
    未知

    公开(公告)号：DK164620C

    公开(公告)日：1992-12-14

    申请号：DK8483

    申请日：1983-01-11

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04 ,  H03C3/06

    Abstract: Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inventive modulation control circuitry includes a microphone (110), audio amplifier (120), splatter filter (130), modulator (150), potentiometer (140), oscillator and transmitter (180), and antenna (190). The audio amplifier (120) further includes an operational amplifier (160) having an input resistor (162) coupled via capacitor (168) to microphone (110), a phase-lag filter (170) coupled to the output of the operational amplifier (160), and a feedback resistor (161) coupled between the filter (170) and the input resistor (162). When driven into amplitude limiting, the phase and amplitude of harmonic signals from the operational amplifier (160) are altered by phase-lag filter (170) to produce a waveform similar to that shown in Fig. 2. When operated linearly, the audio amplifier (120) has a flat frequency response, the filter (170) having no effect since it is in the feedback loop. The improved modulation control circuitry of the present invention can be advantageously utilized in both amplitude and frequency modulated radios (100) for enhancing the audio signal quality thereof.

    Circuit for control of the modulation of a radio transmitter
    4.
    发明专利
    Circuit for control of the modulation of a radio transmitter 未知

    公开(公告)号：DK164620B

    公开(公告)日：1992-07-20

    申请号：DK8483

    申请日：1983-01-11

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04 ,  H03C3/06

    Abstract: Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inventive modulation control circuitry includes a microphone (110), audio amplifier (120), splatter filter (130), modulator (150), potentiometer (140), oscillator and transmitter (180), and antenna (190). The audio amplifier (120) further includes an operational amplifier (160) having an input resistor (162) coupled via capacitor (168) to microphone (110), a phase-lag filter (170) coupled to the output of the operational amplifier (160), and a feedback resistor (161) coupled between the filter (170) and the input resistor (162). When driven into amplitude limiting, the phase and amplitude of harmonic signals from the operational amplifier (160) are altered by phase-lag filter (170) to produce a waveform similar to that shown in Fig. 2. When operated linearly, the audio amplifier (120) has a flat frequency response, the filter (170) having no effect since it is in the feedback loop. The improved modulation control circuitry of the present invention can be advantageously utilized in both amplitude and frequency modulated radios (100) for enhancing the audio signal quality thereof.

    6.
    发明专利
    未知

    公开(公告)号：BR8207675A

    公开(公告)日：1983-04-12

    申请号：BR8207675

    申请日：1982-04-19

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04

    Abstract: Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inventive modulation control circuitry includes a microphone (110), audio amplifier (120), splatter filter (130), modulator (150), potentiometer (140), oscillator and transmitter (180), and antenna (190). The audio amplifier (120) further includes an operational amplifier (160) having an input resistor (162) coupled via capacitor (168) to microphone (110), a phase-lag filter (170) coupled to the output of the operational amplifier (160), and a feedback resistor (161) coupled between the filter (170) and the input resistor (162). When driven into amplitude limiting, the phase and amplitude of harmonic signals from the operational amplifier (160) are altered by phase-lag filter (170) to produce a waveform similar to that shown in Fig. 2. When operated linearly, the audio amplifier (120) has a flat frequency response, the filter (170) having no effect since it is in the feedback loop. The improved modulation control circuitry of the present invention can be advantageously utilized in both amplitude and frequency modulated radios (100) for enhancing the audio signal quality thereof.

    7.
    发明专利
    未知

    公开(公告)号：DK8483D0

    公开(公告)日：1983-01-11

    申请号：DK8483

    申请日：1983-01-11

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04 ,  H04B

    Abstract: Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inventive modulation control circuitry includes a microphone (110), audio amplifier (120), splatter filter (130), modulator (150), potentiometer (140), oscillator and transmitter (180), and antenna (190). The audio amplifier (120) further includes an operational amplifier (160) having an input resistor (162) coupled via capacitor (168) to microphone (110), a phase-lag filter (170) coupled to the output of the operational amplifier (160), and a feedback resistor (161) coupled between the filter (170) and the input resistor (162). When driven into amplitude limiting, the phase and amplitude of harmonic signals from the operational amplifier (160) are altered by phase-lag filter (170) to produce a waveform similar to that shown in Fig. 2. When operated linearly, the audio amplifier (120) has a flat frequency response, the filter (170) having no effect since it is in the feedback loop. The improved modulation control circuitry of the present invention can be advantageously utilized in both amplitude and frequency modulated radios (100) for enhancing the audio signal quality thereof.

    10.
    发明专利
    未知

    公开(公告)号：DK8483A

    公开(公告)日：1983-01-11

    申请号：DK8483

    申请日：1983-01-11

    Applicant: MOTOROLA INC

    Inventor： WEBER PAUL JOHN

    IPC: H03C1/02 ,  H03C3/02 ,  H03G20060101 ,  H03G11/04 ,  H03H11/16 ,  H04B1/02 ,  H04B1/04 ,  H04B

    Abstract: A radio transmitter 100 comprises a microphone 110, a low- frequency amplifier 120, a splatter filter 130, a potentiometer 140, a modulator 150, an oscillator and transmission circuit 180 and an antenna 190. The low-frequency amplifier 120 comprises an operations amplifier 160 with an input resistance 162 which is connected to the microphone 110 via a condenser 168, a phase difference filter 170 which is connected to the output of the operations amplifier 160, and a feedback resistance 161 which is arranged between the filter 170 and the input resistance 162. When the amplifier is operated for clipping, the phase and amplitude of harmonic signals from the operations amplifier 160 of the phase difference filter 170 are changed, whereby excess oscillation in the modulation signal is avoided. During linear operation the low-frequency amplifier 120 has flat characteristics, so that the filter 170 has no effect, as it is arranged in the feedback connection loop. The circuit can advantageously be used in both AM and FM transmitters to improve the signal quality of the transmitter.

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