中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

16 records (took 0.02 seconds)

    Function Signal Generator
    2.
    发明专利
    Function Signal Generator 未知

    公开(公告)号：GB1198298A

    公开(公告)日：1970-07-08

    申请号：GB5375567

    申请日：1967-11-27

    Applicant: IBM

    Inventor： PAULUS ERWIN

    IPC: G10L19/08

    Abstract: 1,198,298. Vocoders. INTERNATIONAL BUSINESS MACHINES CORP. 27 Nov., 1967 [25 Nov.. 19661, No.53755/67. Heading H4R. In a function signal generator to generate excitation function signals to feed to the respective spectrum channels of a vocoder synthesizer a filter circuit is repeatedly fed with pulses derived from the excitation pulse and the resulting repetitive primary function signal from the filter is sampled at successively different points on succeeding repeats of the primary function signal in order to generate a lower frequency replica of the primary function signal. The period between samples is different in the different spectrum channels so that the signals generated consists of components lying in a range of frequencies whose centre frequency is appropriate to the respective spectrum channel, and whose bandwidths are the same for all channels. Fig. 1 shows a vocoder synthesizer in which excitation function signals are generated at the appropriate frequencies, modulated by the aggregate function signals SKS in modulators M1 to Mn, smoothed in low pass filters SM1 to SMn and combined to produce the synthesized speech at SO. The excitation function signals are generated by feeding excitation pulses from APL via "OR" gate OT to filter BF to produce a damped oscillation at a high frequency. The excitation pulse is also applied to delay unit VZ1, having a delay KNdt, and delay unit VZ2, having a delay Ndt, which are interconnected via "AND" gate UT and "OR" gate OT so that each excitation pulse is recirculated and applied to the filter input K times by recirculation through delay VZ2 until "AND" gate UT is inhibited by the inverted output of delay VZ1. Each resulting output from filter BF consequent upon each appearance of the pulse to the filter input is sampled N times by the switch SM and the samples are multipled on to the fixed contacts of switches S1 to Sn so that a complete series of samples making up one complete output signal sequence from filter BF is continuously available around the fixed contacts of switches S1 to Sn. The contact arms of switches S1 to Sn are then driven to read off the sequence of samples at such a speed, different for each spectrum channel, as to provide an excitation signal appropriate in frequency for the respective spectrum channel. The switches may be electronic rather than mechanical.

    Improvements in or relating to vocoder systems
    4.
    发明专利
    Improvements in or relating to vocoder systems 未知

    公开(公告)号：GB1073203A

    公开(公告)日：1967-06-21

    申请号：GB1118866

    申请日：1966-03-15

    Applicant: IBM

    Inventor： PAULUS ERWIN ,  ROTHAUSER ERNST

    IPC: G10L19/02

    Abstract: 1,073,203. Vocoders. INTERNATIONAL BUSINESS MACHINES CORPORATION. Match 15,1966 [March 25, 1965], No. 11188/66. Heading H4R. Channel. vocoder in which each spectrum analysis channel includes a band-pass filter, a rectifier, and a low-pass filter, or integrator circuit; has a voiced-unvoiced detector the output from which is used to lower the cut-off frequency of the low-pass filter, or increase the integration time of the integrator circuit, when unvoiced sounds are detected; in order to reduce noise in the channels. The voiced-unvoiced detector may cause switching between two alternative filters provided for each channel, Fig. 2 (not shown), or it may modify the filtercircuit, e.g. by operation of switch Si. in the filter of Fig. 3. A typical integrator circuit which might be used in each spectrum analysis channel is shown in Fig. 5 in which the spectrum channel signal is applied to band causes capacitor C to be discharged by an amount proportional to the current applied through R 1' Periodically a signal is applied to line a to cause TR 2 to conduct to charge C up to the supply potential. The charging current, which will depend on the total discharge of C since the last charging pulse, flowing through R3 will produce an output pulse on Ki 1 the amplitude of which is proportional to the integral of the spectrum channel signal over a time equal to the period of the pulse signal applied to line a. The voiced-unvoiced discriminator output is employed to increase the period between the pulses applied to line b during unvoiced sounds.

    8.
    发明专利
    未知

    公开(公告)号：DE1276740B

    公开(公告)日：1968-09-05

    申请号：DEJ0030298

    申请日：1966-03-11

    Applicant: IBM

    Inventor： PAULUS ERWIN ,  ROTHAUSER ERNST

    IPC: G10L19/02 ,  H04M1/00

    Abstract: 1,073,203. Vocoders. INTERNATIONAL BUSINESS MACHINES CORPORATION. Match 15,1966 [March 25, 1965], No. 11188/66. Heading H4R. Channel. vocoder in which each spectrum analysis channel includes a band-pass filter, a rectifier, and a low-pass filter, or integrator circuit; has a voiced-unvoiced detector the output from which is used to lower the cut-off frequency of the low-pass filter, or increase the integration time of the integrator circuit, when unvoiced sounds are detected; in order to reduce noise in the channels. The voiced-unvoiced detector may cause switching between two alternative filters provided for each channel, Fig. 2 (not shown), or it may modify the filtercircuit, e.g. by operation of switch Si. in the filter of Fig. 3. A typical integrator circuit which might be used in each spectrum analysis channel is shown in Fig. 5 in which the spectrum channel signal is applied to band causes capacitor C to be discharged by an amount proportional to the current applied through R 1' Periodically a signal is applied to line a to cause TR 2 to conduct to charge C up to the supply potential. The charging current, which will depend on the total discharge of C since the last charging pulse, flowing through R3 will produce an output pulse on Ki 1 the amplitude of which is proportional to the integral of the spectrum channel signal over a time equal to the period of the pulse signal applied to line a. The voiced-unvoiced discriminator output is employed to increase the period between the pulses applied to line b during unvoiced sounds.

Patent Agency Ranking