JPS55138618A - Minimum resonance frequency measuring apparatus of speaker - Google Patents
Minimum resonance frequency measuring apparatus of speakerInfo
- Publication number
- JPS55138618A JPS55138618A JP4777379A JP4777379A JPS55138618A JP S55138618 A JPS55138618 A JP S55138618A JP 4777379 A JP4777379 A JP 4777379A JP 4777379 A JP4777379 A JP 4777379A JP S55138618 A JPS55138618 A JP S55138618A
- Authority
- JP
- Japan
- Prior art keywords
- speaker
- frequency
- minimum resonance
- amplifier
- gate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To measure minimum resonance frequencies rapidly with good reproducibility by connecting the speaker to be measured between an amplifier whose output impedance is low at the pulse inputting and high at the non-inputting and a frequency measuring equipment.
CONSTITUTION: When pulses are input to an amplifier 3 from a pulse generator 1, the speaker 2 to be measured is driven and after the pulse end, it produces natural vibrations of a frequency f0 (minimum resonance frequency) and therefore AC voltage of f0 is obtainable at the terminals of the speaker 2. This voltage is amplified by an amplifier 5 and is converted to a signal which is then led to a gate circuit 9 via divider 6. Part of the output of the divider 6 is applied to a flip-flop 7 and is led to the gate 9. On the other hand, only the clock pulses within the n cycle (nT period) are passed through the gate 9 by the clock pulse train of a clock pulse generator 8 and are counted by a counter 10 to measure the period T which is then converted to a frequency by an inverse number operator 11.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4777379A JPS55138618A (en) | 1979-04-17 | 1979-04-17 | Minimum resonance frequency measuring apparatus of speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4777379A JPS55138618A (en) | 1979-04-17 | 1979-04-17 | Minimum resonance frequency measuring apparatus of speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55138618A true JPS55138618A (en) | 1980-10-29 |
| JPS6318400B2 JPS6318400B2 (en) | 1988-04-18 |
Family
ID=12784693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4777379A Granted JPS55138618A (en) | 1979-04-17 | 1979-04-17 | Minimum resonance frequency measuring apparatus of speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55138618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020158195A1 (en) * | 2019-01-28 | 2020-08-06 | 株式会社Ｊｖｃケンウッド | Speaker minimum resonance frequency measurement device, speaker system, and speaker minimum resonance frequency measurement method |
-
1979
- 1979-04-17 JP JP4777379A patent/JPS55138618A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020158195A1 (en) * | 2019-01-28 | 2020-08-06 | 株式会社Ｊｖｃケンウッド | Speaker minimum resonance frequency measurement device, speaker system, and speaker minimum resonance frequency measurement method |
| JPWO2020158195A1 (en) * | 2019-01-28 | 2021-09-30 | 株式会社Ｊｖｃケンウッド | Speaker minimum resonance frequency measuring device, speaker system, and speaker minimum resonance frequency measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6318400B2 (en) | 1988-04-18 |
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