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    • 2. 发明专利
    • Improvements in and relating to Tuning of High Frequency Amplifiers
    • GB1152360A
    • 1969-05-14
    • GB5647667
    • 1967-12-12
    • MATSUSHITA ELECTRIC IND CO LTD
    • IWAHARA KATSUTOSHI
    • H03G5/28
    • 1,152,360. Automatic tuning of amplifiers; testing radio receivers. MATSUSHITA ELECTRIC INDUSTRIAL CO. Ltd. 12 Dec., 1967 [12 Dec., 1966], No. 56476/67. Headings H3A and H4L. The tuned circuits 11-14 of an I.F. amplifier 5 are aligned in response to the output signals produced by the amplifier when test signals are applied to its input. In Fig. 1 a signal generator 30 produces outputs at, for example, ten frequencies f 1 to f n spaced through the pass-band of the amplifier, the frequencies being fed sequentially via switching means 31 to the input terminal 20, and corresponding outputs derived from a detector 21 are fed via a second switching means 33 to storage means 34. The signals stored in the cells H1-Hn of the storage means are coupled directly and/or through an inverter P1-Pn to a combining circuit 37, which may be a resistance matrix (Fig. 6, not shown) and which provides four output signals for driving the motors 48-51 which adjust the tuning means of the tuned circuits 11-14 to produce a desired amplitude/frequency characteristic determined by the combining circuit 37.
    • 10. 发明专利
    • INSPECTION UNIT FOR SPEAKER CHARACTERISTICS
    • JPS5599900A
    • 1980-07-30
    • JP637479
    • 1979-01-22
    • MATSUSHITA ELECTRIC IND CO LTD
    • YAMATAKA YASUOFUKUMOTO TERUMICHIIWAHARA KATSUTOSHIKAWAHARA TERU
    • H04R29/00
    • PURPOSE:To perform the judgement of properity of speakers in high speed during the production process, by calculating the evaluation items such as range of deviation of speakers and average sound pressure without echo-less room. CONSTITUTION:The output of the measured speaker 2 fitted to the speaker fitting console 1 is converted into electric signal with the microphone 3 placed with a given distance, it is converted into DC with the AC-DC conversion means 5, it is converted into digital signal with the A/D conversion means 6 and inputted to the memory means 15. Further, the current flowing to the speaker 2 is detected with the current detection means 7 and after converting the current detected into DC with the AC/DC conversion means 9, it is further converted into digital with the A/D conversion means 10 and fed to the means 15. Further, the frequency of the oscillation means 11 is fed to the speaker 2, and the control means 12 is controlled with the oscillation time control means 14 every time distance inversely proportional to the frequency to operate the means 6 and 10, and the speaker sound pressure and speaker current value every frequency are detected and the judgement of the propriety of speakers is judged by comparing the detected value with the reference value.